JAC HFC4DA1-2C engine. Instruction — part 8

Maintenance instruction for sunray hfc4da1-2c china-IV diesel engines

114

S/N DTC

Meaning

226

P1061

OBD General fault 10

227

P1062

OBD General fault 11

228

P1063

OBD General fault 12

229

P1064

OBD General fault 13

230

P1065

OBD General fault 14

231

P1066

OBD General fault 15

232

P1067

OBD General fault 16

233

P1068

OBD General fault 2

234

P1069

OBD General fault 3

235

P106A

OBD General fault 4

236

P106B

OBD General fault 5

237

P106C

OBD General fault 6

238

P106D

OBD General fault 7

239

P106E

OBD General fault 8

240

P106F

OBD General fault 9

241 P1070 Blockage

of

particulate

filter

242

P1100

The regulated idling value of air flow sensor is above the upper limit.

243 P1102

The duty cycle of air temperature sensor on the air flow meter is above the upper
limit.

244 P1103

The duty cycle of air temperature sensor on the air flow meter is below the lower
limit.

245 P1106

The time interval measured by the air temperature sensor on the air flow meter is
above the upper limit.

246 P1107

The time interval measured by the air temperature sensor on the air flow meter is
below the lower limit.

247

P110A

System degradation 0

248 P110B Level-1

degradation

249 P110C Level-2

degradation

250 P110D Level-3

degradation

251

P110E

Vehicle performance limit function is activated.

252

P1110

The detected signal within physical range is relatively high.

253 P1111 The

engine

coolant temperature signal level is relatively low.

254

P1120

The correction of air flow sensor load exceeds the maximum deviation limit.

255

P1121

The physical value of air flow meter is above the upper limit.

256

P1122

The physical value of air flow meter is below the lower limit.

Maintenance instruction for sunray hfc4da1-2c china-IV diesel engines

115

S/N DTC

Meaning

257 P1123

The signal level of intake air temperature sensor (integrated inside the air flow
sensor) is relatively low.

258

P1130

The signal level of fuel temperature sensor is relatively low.

259

P1131

The signal of fuel temperature is unreliable.

260

P113A

The signal of too high oil temperature is unreliable.

261

P113B

The signal level of oil temperature sensor is relatively high.

262

P113C

The signal level of oil temperature sensor is relatively low.

263

P1200

Short circuit between the high end and low end of the 1

st

cylinder fuel injector

264

P1201

Short circuit between the high end and low end of the 2

nd

cylinder fuel injector

265

P1202

Short circuit between the high end and low end of the 3

rd

cylinder fuel injector

266

P1203

Short circuit between the high end and low end of the 4

th

cylinder fuel injector

267

P1204

Short circuit between the high end and low end of the 5

th

cylinder fuel injector

268

P1205

Short circuit between the high end and low end of the 6

th

cylinder fuel injector

269 P1207 1

st

cylinder special error

270 P1208 2

nd

cylinder special error

271 P1209 3

rd

cylinder special error

272 P120A 4

th

cylinder special error

273 P120B 5

th

cylinder special error

274 P120C 6

th

cylinder special error

275 P1210

An error is reported when the time for electrifying the 1

st

cylinder reaches to the

minimum.

276 P1211

An error is reported when the time for electrifying the 2

nd

cylinder reaches to the

minimum.

277 P1212

An error is reported when the time for electrifying the 3

rd

cylinder reaches to the

minimum.

278 P1213

An error is reported when the time for electrifying the 4

th

cylinder reaches to the

minimum.

279 P1214

An error is reported when the time for electrifying the 5

th

cylinder reaches to the

minimum.

280 P1215

An error is reported when the time for electrifying the 6

th

cylinder reaches to the

minimum.

281

P1216

Maximum deviation error in the inner control circuit of electronic throttle

282

P1217

Minimum deviation error in the inner control circuit of electronic throttle

283

P1218

Maximum deviation error in the outer control circuit of electronic throttle

284

P1219

Minimum deviation error in the outer control circuit of electronic throttle

285 P121A 1

st

cylinder IQA error

286 P121B 2

nd

cylinder IQA error

Maintenance instruction for sunray hfc4da1-2c china-IV diesel engines

116

S/N DTC

Meaning

287 P121C 3

rd

cylinder IQA error

288 P121D 4

th

cylinder IQA error

289 P121E 5

th

cylinder IQA error

290 P121F 6

th

cylinder IQA error

291

P1220

The signal level of intercooler downstream temperature sensor is relatively high.

292

P1221

The signal level of intercooler downstream temperature sensor is relatively low.

293

P122A

The positive deviation of throttle controller exceeds the upper limit for a long time.

294

P122B

The negative deviation of throttle controller is below the lower limit for a long time.

295

P1230

Error reported in monitoring the OBDII maximum threshold correction

296

P1231

Error reported in monitoring the OBDII minimum threshold correction

297

P1245

System degradation information

298 P1250

An error is triggered when the ET time of the 1

st

cylinder reaches the maximum limit

(when the ZEL comes into effect).

299 P1251

An error is triggered when the ET time of the 2

nd

cylinder reaches the maximum

limit (when the ZEL comes into effect).

300 P1252

An error is triggered when the ET time of the 3

rd

cylinder reaches the maximum limit

(when the ZEL comes into effect).

301 P1253

An error is triggered when the ET time of the 4

th

cylinder reaches the maximum limit

(when the ZEL comes into effect).

302 P1254

An error is triggered when the ET time of the 1

st

cylinder reaches the minimum limit

(when the ZEL comes into effect).

303 P1255

An error is triggered when the ET time of the 2

nd

cylinder reaches the minimum limit

(when the ZEL comes into effect).

304 P1256

An error is triggered when the ET time of the 3

rd

cylinder reaches the minimum limit

(when the ZEL comes into effect).

305 P1257

An error is triggered when the ET time of the 4

th

cylinder reaches the minimum limit

(when the ZEL comes into effect).

306

P1400

EGR valve circuit is open.

307

P1401

Overtemperature of EGR valve bridge-H chip

308

P1402

EGR valve circuit is short to power supply.

309

P1403

EGR valve circuit is short to ground.

310

P140A

The signal level of the EGR cooler downstream temperature is relatively high.

311

P140B

The signal level of the EGR cooler downstream temperature is relatively low.

312

P1410

The positive deviation of throttle controller exceeds the upper limit for a long time.

313

P1411

The negative deviation of throttle controller is below the lower limit for a long time.

314

P1415

The time for transforming from RGN to NRM mode is too long.

315

P1418

The indicator actuator circuit for EGR bypass regulating valve is open.

Maintenance instruction for sunray hfc4da1-2c china-IV diesel engines

117

S/N DTC

Meaning

316

P1419

Overheating of indicator actuator for EGR bypass regulating valve

317

P141A

The indicator actuator circuit for EGR bypass regulating valve is short to battery.

318

P141B

The indicator actuator circuit for EGR bypass regulating valve is short to ground.

319

P141C

The relay actuator circuit for EGR bypass regulating valve is open.

320

P141D

Overheating of relay actuator for EGR bypass regulating valve

321

P141E

The relay actuator circuit for EGR bypass regulating valve is short to battery.

322

P141F

The relay actuator circuit for EGR bypass regulating valve is short to ground.

323

P1420

The maximum exhaust temperature signal of the 1

st

cylinder is too strong.

324

P1421

The maximum exhaust temperature signal of the 2

nd

cylinder is too strong.

325

P1422

The maximum exhaust temperature signal of the 3

rd

cylinder is too strong.

326

P1423

The maximum exhaust temperature signal of the 4

th

cylinder is too strong.

327

P1424

The maximum exhaust temperature signal of the 5

th

cylinder is too strong.

328

P1425

The maximum exhaust temperature signal of the 6

th

cylinder is too strong.

329

P1426

The minimum exhaust temperature signal of the 1

st

cylinder is too strong.

330

P1427

The minimum exhaust temperature signal of the 2

nd

cylinder is too strong.

331

P1428

The minimum exhaust temperature signal of the 3

rd

cylinder is too strong.

332

P1429

The minimum exhaust temperature signal of the 4

th

cylinder is too strong.

333

P142A

The minimum exhaust temperature signal of the 5

th

cylinder is too strong.

334

P142B

The minimum exhaust temperature signal of the 6

th

cylinder is too strong.

335

P1430

The exhaust temperature T0 in cold start is unreliable.

336

P1431

The exhaust temperature T1 in cold start is unreliable.

337

P1432

The exhaust temperature T2 in cold start is unreliable.

338

P1433

The exhaust temperature T3 in cold start is unreliable.

339

P1434

The exhaust temperature T4 in cold start is unreliable.

340

P1435

The exhaust temperature T5 in cold start is unreliable.

341

P1436

The exhaust temperature signal is unreliable.

342

P1437

Unreliable monitoring of the 1

st

cylinder exhaust temperature

343

P1438

Unreliable monitoring of the 2

nd

cylinder exhaust temperature

344

P1439

Unreliable monitoring of the 3

rd

cylinder exhaust temperature

345

P143A

Unreliable monitoring of the 4

th

cylinder exhaust temperature

346

P143B

Unreliable monitoring of the 5

th

cylinder exhaust temperature

347

P143C

Unreliable monitoring of the 6

th

cylinder exhaust temperature

348

P1440

Negative deviation error of oxygen sensor regulator

349

P1441

Positive deviation error of oxygen sensor regulator

Maintenance instruction for sunray hfc4da1-2c china-IV diesel engines

118

S/N DTC

Meaning

350

P1442

Conversion failure of oxygen sensor regulator

351

P1450

The particulate filter upstream temperature is unreliable.

352

P1451

The signal level of particulate filter upstream temperature is relatively high.

353

P1452

The signal level of particulate filter upstream temperature is relatively low.

354

P1453

The signal level of particulate filter upstream temperature sensor is relatively high.

355

P1454

The signal level of particulate filter upstream temperature sensor is relatively low.

356 P1455 Connection

failure

of particulate filter differential pressure sensor hose

357

P1456

The particulate filter differential pressure sensor is unreliable.

358

P1457

Maximum characteristic differential pressure of particulate filter

359

P1458

Minimum characteristic differential pressure of particulate filter

360

P1459

Minimum deviation of particulate filter

361

P145A

The signal level of particulate filter flow impedance is high.

362

P145B

Maximum deviation of particulate filter smoke mass

363

P145C

Minimum deviation of particulate filter smoke mass

364

P145D

Maximum value of particulate filter smoke mass

365

P145E

The signal level of particulate filter flow impedance is relatively high.

366

P145F

The signal level of particulate filter flow impedance is relatively low.

367

P1460

The maximum differential pressure signal of particulate filter is enhanced.

368

P1461

The minimum differential pressure signal of particulate filter is enhanced.

369

P1462

The dynamic differential pressure of particulate filter is unreliable.

370

P1463

The differential pressure self-adaption of particulate filter hose is unreliable.

371

P1464

Particulate filter differential pressure error

372 P146A

The physical value of differential pressure sensor for particulate oxidation catalyst
exceeds the upper limit.

373 P146B

The physical value of differential pressure sensor for particulate oxidation catalyst
falls below the lower limit.

374 P146C CAN

Signal

error

375 P146D CAN

Signal

error

376

P1470

Nernst signal error of oxygen sensor

377

P1471

The oxygen sensor is virtually grounded.

378

P1472

The dynamic signal level of oxygen sensor is relatively low.

379

P1473

Oxygen sensor heater coupling signal fault

380

P1474

The oxygen sensor heater signal is unreliable.

381

P1475

The oxygen sensor battery voltage is relatively low.

382

P1476

The calibration signal level of oxygen sensor is relatively high.

Maintenance instruction for sunray hfc4da1-2c china-IV diesel engines

119

S/N DTC

Meaning

383

P1477

The calibration signal level of oxygen sensor is relatively low.

384

P1478

The oxygen concentration of oxygen sensor exceeds the maximum threshold.

385

P1479

The oxygen concentration of oxygen sensor exceeds the minimum threshold.

386

P147A

Relatively high oxygen concentration is unreliable.

387

P147B

Relatively high oxygen concentration is unreliable.

388

P147C

Relatively high oxygen concentration is unreliable.

389

P147D

Relatively low oxygen concentration is unreliable.

390

P147E

Relatively low oxygen concentration is unreliable.

391

P147F

Relatively low oxygen concentration is unreliable.

392

P1480

The calibration value of oxygen sensor internal impedance is too high.

393

P1481

The calibration value of oxygen sensor internal impedance is too low.

394

P1482

The SPI battery voltage of oxygen sensor is too low.

395

P1483

The SPI signal of oxygen sensor is unreliable.

396

P1484

The oxygen sensor temperature is above the upper limit.

397

P1485

The oxygen sensor temperature is below the lower limit.

398

P1486

The oxygen sensor voltage in shunting exceeds the threshold.

399

P148A

The signal level of turbocharger upstream temperature sensor is relatively high.

400

P148B

The signal level of turbocharger upstream temperature sensor is relatively low.

401

P1500

The voltage signal level of vehicle speed sensor is relatively high.

402

P1501

The voltage signal level of vehicle speed sensor is relatively low.

403 P150A

Power supply diagnosis is disabled in electrifying phase due to overvoltage of
battery.

404 P150B

Power supply diagnosis is disabled in electrifying phase due to under-voltage of
battery.

405

P1510

The signal level measured by A/C coolant pressure sensor is too low.

406

P1511

The signal level measured by A/C coolant pressure sensor is too low.

407

P1512

The signal level measured by A/C coolant pressure sensor is too high.

408

P1513

The signal level measured by A/C coolant pressure sensor is too high.

409 P1514

Overtemperature of compressor torque reduction command circuit in electrifying
phase

410

P1515

A/C switch CAN input signal is unreliable.

411 P1516

The compressor torque reduction command circuit in electrifying phase is short to
ground.

412 P1517

The compressor torque reduction command circuit in electrifying phase is short to
power.

413

P1520

Short circuit of turbocharger bridge-H

Maintenance instruction for sunray hfc4da1-2c china-IV diesel engines

120

S/N DTC

Meaning

414

P1521

Under-voltage of turbocharger bridge-H

415 P1522 Overcurrent

of

turbocharger

bridge-H

416

P1523

Overtemperature of turbocharger bridge-H

417

P1524

Overcurrent of turbocharger bridge-H temperature sensor

418

P1525

The valve is stuck in deviation learning process.

419

P1526

Output circuit 1 of turbocharger bridge-H is short to ground.

420

P1527

Output circuit 1 of turbocharger bridge-H is short to ground.

421

P1528

Output circuit 1 of turbocharger bridge-H is short to battery.

422

P1529

Output circuit 2 of turbocharger bridge-H is short to battery.

423

P1601

EGR valve circuit is open.

424

P1602

Too high downstream temperature of coolant temperature sensor is unreliable.

425

P1603

EGR valve circuit is short to power supply.

426

P1604

EGR valve circuit is short to ground.

427

P1608

EGR valve circuit is short to power supply.

428

P1609

EGR valve circuit is short to ground.

429

P160A

EGR valve circuit is open.

430

P160B

Overtemperature of EGR valve bridge-H chip

431

P160C

Overcurrent of turbocharger bridge-H temperature sensor

432

P1610

Execute closing fuel injection under standard ICO mode.

433

P1613

The electrifying time detected by galloping prevention monitor is too long.

434

P1614

Several faults occur during SPI communication.

435

P1615

Time-out when trying to set up or cancel alarm task

436

P1617

Error reported in monitoring under-voltage

437 P1618 WDA

works

abnormally.

438

P1619

EGR valve circuit is short to power supply.

439

P161A

EGR valve circuit is short to ground.

440

P161B

EGR valve circuit is open.

441

P161C

EGR valve circuit is open.

442

P161D

Failure in software reset visibility

443

P161E

Failure in software reset visibility

444

P161F

Failure in software reset visibility

445

P1620

TTLAMP drive circuit is open.

446

P1621

The drive circuit for fuel consumption display is short to power supply.

447

P1622

The drive circuit for fuel consumption display is short to ground.

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

121

S/N DTC

Meaning

448

P1623

The drive circuit for fuel consumption display is open.

449

P1624

Overtemperature of the drive circuit for fuel consumption display

450

P1625

TTLAMP drive circuit is short to power supply.

451

P1626

TTLAMP drive circuit is short to ground.

452

P1627

Overheating of TTLAMP drive circuit

453

P1633

The signal level of ECU temperature sensor is relatively high.

454

P1634

The signal level of ECU temperature sensor is relatively high.

455

P1635

The signal level of ECU temperature sensor is relatively low.

456

P1636

The signal level of ECU temperature sensor is relatively low.

457

P1637

The power supply voltage is too high.

458

P1638

The power supply voltage is too low.

459

P1639

The physical value of ECU temperature sensor exceeds the upper limit.

460

P163A

The physical value of ECU temperature sensor falls below the lower limit.

461

P163B

ECU temperature sensor SPI fault (LM71)

462

P1640

Compressor overtemperature in electrifying phase

463

P1643

Signal safety checkout error

464

P1645

The injection frequency is limited by the boosting electric quantity charging balance.

465 P1646

The injection frequency is limited by the high pressure fuel pump fuel quantity
balance.

466

P1647

The injection frequency is limited by the runtime.

467

P164C

EGR valve circuit is open.

468

P164D

EGR valve circuit is short to power supply.

469

P164E

EGR valve circuit is short to ground.

470 P1650 EEP

Clear

Error

471 P1651 EEP

Clear

Error

472

P1652

An error is reported when the module’s data-writing is disabled for three times.

473 P165A Null

dataset

identifier

474

P165B

Dataset switchover fault

475

P165C

EEPROM data-reading error

476

P1660

ADC open circuit pulse test fault

477

P1662

The voltage being transformed by ADC module exceeds the set range of test voltage.

478

P1663

The radiometry correction exceeds the set range.

479

P1664

Monitoring control communication fault

480

P1665

SPI Monitoring control communication fault

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

122

S/N DTC

Meaning

481

P1666

Several faults occur when testing the whole ROM zone.

482 P1667

The number of responsive bytes obtained from CPU in monitoring mode is too small
/ Error of the set response time of monitoring mode

483

P1668

Error of the set response time of monitoring mode

484

P166A

OFF-route test time-out

485

P166B

The electrifying time for injection is unreliable.

486

P166C

The initial electrifying angle (SO E) is unreliable.

487

P166D

ZFC is unreliable.

488

P166E

Fuel injection monitoring mode 1

489

P166F

Fuel injection monitoring mode 2

490

P1670

Error reported in fuel injection correction

491

P1671

Unreliable rail pressure

492 P1672

The torque limit is set once any error is detected before the MoCSOP's error is
generated.

493

P1673

Monitoring OFF-route forward test fault

494

P1674

Monitoring fault mode 3

495

P1675

The negative deviation of throttle controller is below the lower limit for a long time.

496

P1676

Open circuit of EGR valve bridge-H

497

P1677

Overload of EGR valve bridge-H

498

P1678

Overtemperature of EGR valve bridge-H chip

499 P167B CY33X

fault

500 P167C

The set value of rail pressure is limited by the torque limit of the function control
unit.

501

P1680

The cruise indicator drive circuit is open.

502

P1681

Overtemperature of cruise indicator drive circuit

503

P1682

The cruise indicator drive circuit is short to power supply or high level.

504

P1683

The cruise indicator drive circuit is short to ground.

505

P1684

The grill heater is always ON.

506

P1685

DFC mechanical fault when turning on ignition switch

507

P1686

Fuel filter heating power level temperature fault

508

P1687

CJ945 Power level no load fault

509

P1688

CJ945 Power level no load fault

510

P1689

Overheating of intake air heater drive circuit

511

P168A

CJ945 Overheating fault

512

P168B

CJ945 Power level is short to battery.

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

123

S/N DTC

Meaning

513

P168C

CJ945 Power level is short to battery.

514

P168D

CJ945 Power level is short to ground.

515

P168E

CJ945 Power level is short to ground.

516

P1700

Unreliable clutch signal / Clutch signal error

517

P1710

Overheating of engine speed sensor

518 P1720 Transmission

neutral

position

signal

519

P2002

The particulate oxidation catalyst device is removed.

520

P2004

Overcurrent of EGR valve bridge-H based on temperature

521

P2008

EGR valve circuit is open.

522

P2009

EGR valve circuit is short to ground.

523

P2010

EGR valve circuit is short to power supply.

524

P2014

Under-voltage of EGR valve bridge-H

525

P2015

The turbocharger control valve is stuck.

526

P2072

The throttle valve is frozen.

527

P2076

An error is reported when the EGR valve is stuck in closing or opening.

528

P2077

The signal level of swirl valve position sensor is relatively low.

529 P2078

The signal level measured by the variable swirl valve position sensor is above the
limit.

530

P207A

Overtemperature of EGR valve bridge-H chip

531

P207B

The short-term jitter of EGR valve exceeds the limit.

532

P2100

Open circuit of throttle bridge-H

533

P2101

Overcurrent of throttle bridge-H

534

P2102

Output circuit 1 of throttle bridge-H is short to ground.

535

P2103

Output circuit 1 of throttle bridge-H is short to battery.

536

P2135

Signals of accelerator pedal position sensor 1 and 2 are unreliable.

537

P213A

Open circuit of EGR valve bridge-H

538

P213B

Overload of EGR valve bridge-H

539

P213C

The Port 2 of EGR valve bridge-H chip is short to ground.

540

P213D

The Port 2 of EGR valve bridge-H chip is short to ground.

541

P2141

The Port 1 of EGR valve bridge-H chip is short to ground.

542

P2142

The Port 1 of EGR valve bridge-H chip is short to power supply.

543 P2146 Short

circuit

544 P2149 Short

circuit

545

P2157

Unreliable vehicle speed signal

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

124

S/N DTC

Meaning

546

P2173

False positive deviation of throttle regulator

547

P2175

False negative deviation of throttle regulator

548

P2226

Fault of signal obtained from CAN by air pressure sensor

549

P2228

The signal value of ambient pressure is below the lower limit.

550

P2229

The signal value of ambient pressure is above the upper limit.

551

P2264

EGR valve circuit is open.

552

P2265

An error is reported when the moisture content in fuel is detected.

553

P2266

EGR valve circuit is short to ground.

554

P2267

EGR valve circuit is short to power supply.

555

P2268

EGR valve circuit is open.

556

P2269

The sensor self-checking signal level is above the upper limit.

557

P2290

The rail pressure is below the minimum set value.

558

P242F

The particulate filter smoke load exceeds the maximum.

559

P2454

The signal level of particulate filter differential pressure sensor is relatively low.

560

P2455

The signal level of particulate filter differential pressure sensor is relatively high.

561 P2458 Particulate

filter

regeneration permanent fault

562

P245A

EGR cooler bypass valve fault

563

P245B

Too low EGR cooling efficiency

564

P245D

The signal level of EGR cooler sensor is relatively high.

565

P250F

Danger is caused by too low fuel level and air ingress into hydraulic system.

566

P2519

A/C switch CAN input signal error

567

P2522

The compressor torque reduction command circuit in electrifying phase is open.

568

P2562

The turbocharger bridge-H chip circuit is open.

569

P2563

The turbocharger control valve is stuck.

570

P2564

The original voltage of EGR valve sensor signal is below the lower limit.

571

P2565

The original voltage of EGR valve sensor signal is above the upper limit.

572

P2621

The throttle signal level is relatively low.

573

P2622

The throttle signal level is relatively high.

574

P2626

The oxygen sensor pump current terminal IP is in open circuit.

575 B0020 Airbag

collision

status

576

U0121

ABS ECU main data loss

577

U0400

CAN received frame BCM1 message length error

578

U0415

CAN received frame ABS1 message length error

Maintenance manual for sunray hfc4da1-2c china-IV diesel engines

125

Section V. Fault Diagnosis for Electronic-Controlled Common Rail Diesel Engines

z Prior to disconnecting or reconnecting the power cord of engine control module (ECM), be sure to turn off the

ignition switch, in order not to damage the ECM.

z All types of engine DTCs are stored in the ECM memory.

z The engine DTCs should be cleared after the maintenance.

Common DTCs and Troubleshooting Methods for Electronic Control Systems of Diesel Engines

1.

DTC

P0475

The exhaust brake valve control line is open.

P0476

The ECU internal driver module of exhaust brake valve control line is
overheating.

P0477

The exhaust brake valve control line is short to ground.

P0478

The exhaust brake valve control line is short to high level.

Fault Description: The engine control unit (ECU) shall actuate the exhaust braking after processing the signal
received from the exhaust brake switch and also check if the exhaust brake feedback signal matches with the ECU
control command. If not, DTC shall be reported.

Diagnosis Hint: The intermittent failure may be caused by poor contact of wire, abrasion of the insulation or damage
of the wire inside insulation.

Check for the following conditions:

z Poor contact of ECU or exhaust brake valve – Check the harness connector

– Loose terminal

– Poor matching and connection

– Breakage of keeper

– Distortion or damage of terminal

– Poor contact between terminal and wire

z Damage of harness – Check the harness for any damage

Terminal ECU

K29 Exhaust

brake

actuator

Exhaust brake actuator

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Fault Tree:

检查制动阀连接

检修或更换

制动阀问题

更换制动阀

对制动阀外观检测

插接件问题

更换ECU

Y

N

N

Y

检查ECU插接件

Y

检修或更换

N

联系技术支持

N

Check the connection of brake valve.

Connector fault

Repair or replace it.

Check the appearance of brake valve.

Fault of brake valve

Replace the brake valve.

Check the ECU connector.

Repair or replace it.

Replace the ECU.

Get the Technical Support.

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2.

DTC

P0069

The boost pressure sensor drift

P0237

The boost pressure sensor output voltage is below the lower limit (the wiring
is short to ground).

P0238

The boost pressure sensor output voltage is above the upper limit (the wiring
is open or short to high level).

P0097

The voltage of intake air temperature sensor is too low (the wiring is short to
ground).

P0098

The voltage of intake air temperature sensor is too high (the wiring is open
or short to high level).

Fault Description: The boost pressure sensor shall make response to the pressure change of intake manifold. The
pressure changes with the engine load. The ECU shall supply 5V voltage to the 5V reference voltage circuit of boost
pressure sensor and also supply grounding for the low reference voltage circuit. The boost pressure sensor shall
provide a signal that is related to the pressure change of intake manifold to ECU via the boost pressure sensor signal
circuit. When the intake manifold pressure is relatively low (for example: during idling period), the low level signal
voltage shall be detected by the ECU. When it is relatively high (for example: with the accelerator pedal fully open
(WOT)), the high level signal voltage shall be detected. The boost pressure sensor is also for determining the
barometric pressure (BARO). When the ignition switch is turned on without starting the engine, the following
condition shall occur. As long as the accelerator pedal position sensor signal is more than 28%, the barometric
pressure reading shall be updated. The boost pressure sensor includes the following circuits:

z A 5V reference voltage circuit

z A low reference voltage circuit

z A MAP sensor signal circuit

If the boost pressure sensor signal detected by ECU is beyond the set range, relevant DTC shall be generated.

The intake air temperature (IAT) sensor is a kind of variable resistor that can measure the temperature of air into the
engine. The ECU shall supply 5V voltage to the signal circuit of IAT sensor and also supply grounding for the
reference voltage circuit of IAT sensor. When the IAT sensor is in cold state, the sensor resistance is relatively high.
When the air temperature increases, the sensor resistance shall decrease. When the sensor resistance is relatively high,
the voltage of IAT sensor signal circuit detected by ECU shall be relatively high. With the decrease of sensor
resistance, the voltage of IAT sensor signal circuit detected by ECU shall decrease also. If the signal voltage of IAT
sensor detected by ECU is too low (indicating the temperature is too high), or too high (indicating the temperature is
too low), relevant DTC shall be generated.

Boost pressure /

intake air

temperature sensor

5V power supply

Pressure signal

Ground

Temperature signal

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Diagnosis Hint:

The normal boost pressure sensor shall make quick response to the change of accelerator pedal position, so its slow
action should not appear or it should not act slower than the change of accelerator pedal position.

For poor contact inspection between ECU and IAT sensor, please check the ECU harness connector for the following
conditions:

− Loose terminal

− Poor matching and connection

− Breakage of keeper

− Distortion or damage of terminal

− Poor contact between terminal and wire

Terminal ECU

A07

Power supply terminal of sensor

A53

Temperature signal terminal

A54 Pressure

signal

terminal

A28

Ground terminal of sensor

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Fault Tree:

Check the component connector.

Connector fault

Repair or replace it.

Repair or replace it.

Detect the sensor.

Sensor fault

Replace the sensor.

Fault of ECU connector

Get the Technical Support.

Repair the harness.

Check continuity and insulating

property.

Electrical fault

Replace the component.

Does the problem still exist?