Nissan Pathfinder (2008 year). Manual — part 350

ECM

EC-917

< ECU DIAGNOSIS >

[VK56DE]

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• When there is an open circuit on MIL circuit, the ECM cannot warn the driver by lighting up MIL when there

is malfunction on engine control system.
Therefore, when electrical controlled throttle and part of ECM related diagnoses are continuously detected
as NG for 5 trips, ECM warns the driver that engine control system malfunctions and MIL circuit is open by
means of operating fail-safe function.
The fail-safe function also operates when above diagnoses except MIL circuit are detected and demands the
driver to repair the malfunction.

DTC No.

Detected items

Engine operating condition in fail-safe mode

P0102
P0103

Mass air flow sensor circuit

Engine speed will not rise more than 2,400 rpm due to the fuel cut.

P0117
P0118

Engine coolant tempera-
ture sensor circuit

Engine coolant temperature will be determined by ECM based on the following condition.
CONSULT-III displays the engine coolant temperature decided by ECM.

Condition

Engine coolant temperature decided

(CONSULT-III display)

Just as ignition switch is turned ON
or START

40

°

C (104

°

F)

Approx. 4 minutes or more after
engine starting.

80

°

C (176

°

F)

Except as shown above

40 - 80

°

C (104 - 176

°

F)

(Depends on the time)

When the fail-safe system for engine coolant temperature sensor is activated, the cooling
fan operates while engine is running.

P0122
P0123
P0222
P0223
P2135

Throttle position sensor

The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor.

P0643

Sensor power supply

ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.

P2100
P2103

Throttle control motor relay

ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.

P2101

Electric throttle control
function

ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.

P2118

Throttle control motor

ECM stops the electric throttle control actuator control, throttle valve is maintained at a
fixed opening (approx. 5 degrees) by the return spring.

P2119

Electric throttle control ac-
tuator

(When electric throttle control actuator does not function properly due to the return spring
malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around the
idle position. The engine speed will not rise more than 2,000 rpm.

(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening to 20
degrees or less.

(When ECM detects the throttle valve is stuck open:)
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle stops, the
engine stalls.
The engine can restart in N or P position, and engine speed will not exceed 1,000 rpm or
more.

P2122
P2123
P2127
P2128
P2138

Accelerator pedal position
sensor

The ECM controls the electric throttle control actuator in regulating the throttle opening in
order for the idle position to be within +10 degrees.
The ECM regulates the opening speed of the throttle valve to be slower than the normal
condition.
So, the acceleration will be poor.

Engine operating condition in fail-safe mode

Engine speed will not rise more than 2,500 rpm due to the fuel cut

EC-918

< ECU DIAGNOSIS >

[VK56DE]

ECM

DTC Inspection Priority Chart

INFOID:0000000001538018

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
• If DTC U1000 and/or U1001 is displayed with other DTC, first perform the trouble diagnosis for DTC

U1000, U1001. Refer to

EC-566

.

• If DTC U1010 is displayed with other DTC, first perform the trouble diagnosis for DTC U1010. Refer to

EC-567

.

Priority

Detected items (DTC)

1

• U1000 U1001 CAN communication line
• U1010 CAN communication
• P0101 P0102 P0103 Mass air flow sensor
• P0112 P0113 P0127 Intake air temperature sensor
• P0117 P0118 P0125 Engine coolant temperature sensor
• P0122 P0123 P0222 P0223 P1225 P1226 P2135 Throttle position sensor
• P0128 Thermostat function
• P0181 P0182 P0183 Fuel tank temperature sensor
• P0327 P0328 P0332 P0333 Knock sensor
• P0335 Crankshaft position sensor (POS)
• P0340 Camshaft position sensor (PHASE)
• P0460 P0461 P0462 P0463 Fuel level sensor
• P0500 Vehicle speed sensor
• P0605 ECM
• P0643 Sensor power supply
• P0700 TCM
• P0705 Park/neutral position (PNP) switch
• P0850 Park/neutral position (PNP) switch
• P1550 P1551 P1552 P1553 P1554 Battery current sensor
• P1610 - P1615 NATS
• P2122 P2123 P2127 P2128 P2138 Accelerator pedal position sensor

ECM

EC-919

< ECU DIAGNOSIS >

[VK56DE]

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DTC Index

INFOID:0000000001538019

EMISSION-RELATED DIAGNOSTIC INFORMATION ITEMS

×

:Applicable —: Not applicable

2

• P0031 P0032 P0051 P0052 A/F sensor 1 heater
• P0037 P0038 P0057 P0058 Heated oxygen sensor 2 heater
• P0075 P0081 Intake valve timing control solenoid valve
• P0130 P0131 P0132 P0133 P0150 P0151 P0152 P0153 P2A00 P2A03 A/F sensor 1
• P0137 P0138 P0139 P0157 P0158 P0159 Heated oxygen sensor 2
• P0441 EVAP control system purge flow monitoring
• P0443 P0444 P0445 EVAP canister purge volume control solenoid valve
• P0447 P0448 EVAP canister vent control valve
• P0451 P0452 P0453 EVAP control system pressure sensor
• P0550 Power steering pressure sensor
• P0603 ECM power supply
• P0710 P0717 P0720 P0731 P0732 P0733 P0734 P0735 P0740 P0744 P0745 P1730 P1752 P1757 P1762 P1767

P1772 P1774 A/T related sensors, solenoid valves and switches

• P1217 Engine over temperature (OVERHEAT)
• P1140 P1145 Intake valve timing control position sensor
• P1805 Brake switch
• P2100 P2103 P2118 Electric throttle control actuator
• P2101 Electric throttle control function

3

• P0011 P0021 Intake valve timing control
• P0171 P0172 P0174 P0175 Fuel injection system function
• P0300 - P0308 Misfire
• P0420 P0430 Three way catalyst function
• P0442 EVAP control system (SMALL LEAK)
• P0455 EVAP control system (GROSS LEAK)
• P0456 EVAP control system (VERY SMALL LEAK)
• P0506 P0507 Idle speed control system
• P1148 P1168 Closed loop control
• P1211 TCS control unit
• P1212 TCS communication line
• P1421 Cold start control
• P1564 ASCD steering switch
• P1572 ASCD brake switch
• P1574 ASCD vehicle speed sensor
• P2119 Electric throttle control actuator

Priority

Detected items (DTC)

Items

(CONSULT-III screen terms)

DTC*

1

SRT code

Trip

MIL

Reference

page

CONSULT-III

GST*

2

ECM*

3

CAN COMM CIRCUIT

U1000

1000*

5

—

1

×

EC-566

CAN COMM CIRCUIT

U1001

1001*

5

—

2

—

EC-566

CONTROL UNIT(CAN)

U1010

1010

—

1

×

EC-567

NO DTC IS DETECTED.
FURTHER TESTING
MAY BE REQUIRED.

P0000

0000

—

—

Flashing*

7

EC-534

INT/V TIM CONT-B1

P0011

0011

—

2

×

EC-520

INT/V TIM CONT-B2

P0021

0021

—

2

×

EC-520

A/F SEN1 HTR (B1)

P0031

0031

—

2

×

EC-575

A/F SEN1 HTR (B1)

P0032

0032

—

2

×

EC-575

HO2S2 HTR (B1)

P0037

0037

—

2

×

EC-578

HO2S2 HTR (B1)

P0038

0038

—

2

×

EC-578

A/F SEN1 HTR (B2)

P0051

0051

—

2

×

EC-575

A/F SEN1 HTR (B2)

P0052

0052

—

2

×

EC-575

EC-920

< ECU DIAGNOSIS >

[VK56DE]

ECM

HO2S2 HTR (B2)

P0057

0057

—

2

×

EC-578

HO2S2 HTR (B2)

P0058

0058

—

2

×

EC-578

INT/V TIM V/CIR-B1

P0075

0075

—

2

×

EC-582

INT/V TIM V/CIR-B2

P0081

0081

—

2

×

EC-582

MAF SEN/CIRCUIT-B1

P0101

0101

—

2

×

EC-585

MAF SEN/CIRCUIT-B1

P0102

0102

—

1

×

EC-591

MAF SEN/CIRCUIT-B1

P0103

0103

—

1

×

EC-591

IAT SEN/CIRCUIT-B1

P0112

0112

—

2

×

EC-596

IAT SEN/CIRCUIT-B1

P0113

0113

—

2

×

EC-596

ECT SEN/CIRC

P0117

0117

—

1

×

EC-599

ECT SEN/CIRC

P0118

0118

—

1

×

EC-599

TP SEN 2/CIRC-B1

P0122

0122

—

1

×

EC-603

TP SEN 2/CIRC-B1

P0123

0123

—

1

×

EC-603

ECT SENSOR

P0125

0125

—

2

×

EC-607

IAT SENSOR-B1

P0127

0127

—

2

×

EC-610

THERMSTAT FNCTN

P0128

0128

—

2

×

EC-613

A/F SENSOR1 (B1)

P0130

0130

—

2

×

EC-615

A/F SENSOR1 (B1)

P0131

0131

—

2

×

EC-619

A/F SENSOR1 (B1)

P0132

0132

—

2

×

EC-623

A/F SENSOR1 (B1)

P0133

0133

×

2

×

EC-627

HO2S2 (B1)

P0137

0137

×

2

×

EC-633

HO2S2 (B1)

P0138

0138

×

2

×

EC-638

HO2S2 (B1)

P0139

0139

×

2

×

EC-646

A/F SENSOR1 (B2)

P0150

0150

—

2

×

EC-615

A/F SENSOR1 (B2)

P0151

0151

—

2

×

EC-619

A/F SENSOR1 (B2)

P0152

0152

—

2

×

EC-623

A/F SENSOR1 (B2)

P0153

0153

×

2

×

EC-627

HO2S2 (B2)

P0157

0157

×

2

×

EC-633

HO2S2 (B2)

P0158

0158

×

2

×

EC-638

HO2S2 (B2)

P0159

0159

×

2

×

EC-646

FUEL SYS-LEAN-B1

P0171

0171

—

2

×

EC-651

FUEL SYS-RICH-B1

P0172

0172

—

2

×

EC-656

FUEL SYS-LEAN-B2

P0174

0174

—

2

×

EC-651

FUEL SYS-RICH-B2

P0175

0175

—

2

×

EC-656

FTT SENSOR

P0181

0181

—

2

×

EC-661

FTT SEN/CIRCUIT

P0182

0182

—

2

×

EC-664

FTT SEN/CIRCUIT

P0183

0183

—

2

×

EC-664

TP SEN 1/CIRC-B1

P0222

0222

—

1

×

EC-667

TP SEN 1/CIRC-B1

P0223

0223

—

1

×

EC-667

MULTI CYL MISFIRE

P0300

0300

—

2

×

EC-671

CYL 1 MISFIRE

P0301

0301

—

2

×

EC-671

CYL 2 MISFIRE

P0302

0302

—

2

×

EC-671

Items

(CONSULT-III screen terms)

DTC*

1

SRT code

Trip

MIL

Reference

page

CONSULT-III

GST*

2

ECM*

3

ECM

EC-921

< ECU DIAGNOSIS >

[VK56DE]

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CYL 3 MISFIRE

P0303

0303

—

2

×

EC-671

CYL 4 MISFIRE

P0304

0304

—

2

×

EC-671

CYL 5 MISFIRE

P0305

0305

—

2

×

EC-671

CYL 6 MISFIRE

P0306

0306

—

2

×

EC-671

CYL 7 MISFIRE

P0307

0307

—

2

×

EC-671

CYL 8 MISFIRE

P0308

0308

—

2

×

EC-671

KNOCK SEN/CIRC-B1

P0327

0327

—

2

—

EC-678

KNOCK SEN/CIRC-B1

P0328

0328

—

2

—

EC-678

KNOCK SEN/CIRC-B2

P0332

0332

—

2

—

EC-678

KNOCK SEN/CIRC-B2

P0333

0333

—

2

—

EC-678

CKP SEN/CIRCUIT

P0335

0335

—

2

×

EC-681

CMP SEN/CIRC-B1

P0340

0340

—

2

×

EC-685

TW CATALYST SYS-B1

P0420

0420

×

2

×

EC-689

TW CATALYST SYS-B2

P0430

0430

×

2

×

EC-689

EVAP PURG FLOW/MON

P0441

0441

×

2

×

EC-694

EVAP SMALL LEAK

P0442

0442

×

2

×

EC-699

PURG VOLUME CONT/V

P0443

0443

—

2

×

EC-707

PURG VOLUME CONT/V

P0444

0444

—

2

×

EC-712

PURG VOLUME CONT/V

P0445

0445

—

2

×

EC-712

VENT CONTROL VALVE

P0447

0447

—

2

×

EC-715

VENT CONTROL VALVE

P0448

0448

—

2

×

EC-719

EVAP SYS PRES SEN

P0451

0451

—

2

×

EC-724

EVAP SYS PRES SEN

P0452

0452

—

2

×

EC-727

EVAP SYS PRES SEN

P0453

0453

—

2

×

EC-731

EVAP GROSS LEAK

P0455

0455

—

2

×

EC-736

EVAP VERY SML LEAK

P0456

0456

×

*

4

2

×

EC-743

FUEL LEV SEN SLOSH

P0460

0460

—

2

×

EC-751

FUEL LEVEL SENSOR

P0461

0461

—

2

×

EC-753

FUEL LEVL SEN/CIRC

P0462

0462

—

2

×

EC-755

FUEL LEVL SEN/CIRC

P0463

0463

—

2

×

EC-755

VEH SPEED SEN/CIRC*

6

P0500

0500

—

2

×

EC-757

ISC SYSTEM

P0506

0506

—

2

×

EC-759

ISC SYSTEM

P0507

0507

—

2

×

EC-761

PW ST P SEN/CIRC

P0550

0550

—

2

—

EC-763

ECM BACK UP/CIRC

P0603

0603

—

2

×

EC-766

ECM

P0605

0605

—

1 or 2

×

or —

EC-768

SENSOR POWER/CIRC

P0643

0643

—

1

×

EC-770

TCM

P0700

0700

—

1

×

TM-49

PNP SW/CIRC

P0705

0705

—

2

×

TM-50

ATF TEMP SEN/CIRC

P0710

0710

—

2

×

TM-77

VHCL SPD SEN/CIR AT*

6

P0720

0720

—

2

×

TM-54

A/T 1ST GR FNCTN

P0731

0731

—

2

×

TM-59

Items

(CONSULT-III screen terms)

DTC*

1

SRT code

Trip

MIL

Reference

page

CONSULT-III

GST*

2

ECM*

3

EC-922

< ECU DIAGNOSIS >

[VK56DE]

ECM

A/T 2ST GR FNCTN

P0732

0732

—

2

×

TM-61

A/T 3ST GR FNCTN

P0733

0733

—

2

×

TM-63

A/T 4ST GR FNCTN

P0734

0734

—

2

×

TM-65

A/T 5ST GR FNCTN

P0735

0735

—

2

×

TM-67

TCC SOLENOID/CIRC

P0740

0740

—

2

×

TM-69

A/T TCC S/U FNCTN

P0744

0744

—

2

×

TM-71

L/PRESS SOL/CIRC

P0745

0745

—

2

×

TM-73

P-N POS SW/CIRCUIT

P0850

0850

—

2

×

EC-773

INTK TIM S/CIRC-B1

P1140

1140

—

2

×

EC-776

INTK TIM S/CIRC-B2

P1145

1145

—

2

×

EC-776

CLOSED LOOP-B1

P1148

1148

—

1

×

EC-780

CLOSED LOOP-B2

P1168

1168

—

1

×

EC-780

TCS C/U FUNCTN

P1211

1211

—

2

—

EC-781

TCS/CIRC

P1212

1212

—

2

—

EC-782

ENG OVER TEMP

P1217

1217

—

1

×

EC-783

CTP LEARNING-B1

P1225

1225

—

2

—

EC-787

CTP LEARNING-B1

P1226

1226

—

2

—

EC-789

COLD START CONTROL

P1421

1421

—

2

×

EC-791

BAT CURRENT SENSOR

P1550

1550

—

2

—

EC-793

BAT CURRENT SENSOR

P1551

1551

—

2

—

EC-797

BAT CURRENT SENSOR

P1552

1552

—

2

—

EC-797

BAT CURRENT SENSOR

P1553

1553

—

2

—

EC-801

BAT CURRENT SENSOR

P1554

1554

—

2

—

EC-805

ASCD SW

P1564

1564

—

1

—

EC-809

ASCD BRAKE SW

P1572

1572

—

1

—

EC-813

ASCD VHL SPD SEN*

8

P1574

1574

—

1

—

EC-818

LOCK MODE

P1610

1610

—

2

—

SEC-40

or

SEC-118

ID DISCARD IMM-ECM

P1611

1611

—

2

—

SEC-34

or

SEC-115

CHAIN OF ECM-IMMU

P1612

1612

—

2

—

SEC-36

or

SEC-117

CHAIN OF IMMU-KEY

P1614

1614

—

2

—

SEC-30

or

SEC-111

DIFFERENCE OF KEY

P1615

1615

—

2

—

SEC-33

or

SEC-114

A/T INTERLOCK

P1730

1730

—

1

×

TM-82

I/C SOLENOID/CIRC

P1752

1752

—

1

×

TM-86

FR/B SOLENOID/CIRC

P1757

1757

—

1

×

TM-88

D/C SOLENOID/CIRC

P1762

1762

—

1

×

TM-90

HLR/C SOL/CIRC

P1767

1767

—

1

×

TM-92

LC/B SOLENOID/CIRC

P1772

1772

—

1

×

TM-94

LC/B SOLENOID FNCT

P1774

1774

—

1

×

TM-96

BRAKE SW/CIRCUIT

P1805

1805

—

2

—

EC-820

Items

(CONSULT-III screen terms)

DTC*

1

SRT code

Trip

MIL

Reference

page

CONSULT-III

GST*

2

ECM*

3

ECM

EC-923

< ECU DIAGNOSIS >

[VK56DE]

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*1: 1st trip DTC No. is the same as DTC No.

*2: This number is prescribed by SAE J2012.

*3: In Diagnostic Test Mode II (Self-diagnostic results), this number is controlled by NISSAN.

*4: SRT code will not be set if the self-diagnostic result is NG.

*5: The troubleshooting for this DTC needs CONSULT-III.

*6: When the fail-safe operations for both self-diagnoses occur, the MIL illuminates.

*7: When the ECM is in the mode of displaying SRT status, MIL may flash. For the details, refer to How to “Display SRT Status”.

*8: 2WD models

Emission-related Diagnostic Information

INFOID:0000000001605604

DTC AND 1ST TRIP DTC

The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic
result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not reoccur, the 1st trip
DTC will not be displayed.
If a malfunction is detected during the 1st trip, the 1st trip DTC is stored in the ECM memory. The MIL will not
light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required
driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the
2nd trip, both the 1st trip DTC and DTC are stored in the ECM memory and the MIL lights up. In other words,
the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two consec-
utive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and 2nd
trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL during the
1st trip, the DTC and 1st trip DTC are stored in the ECM memory.
Procedures for clearing the DTC and the 1st trip DTC from the ECM memory are described in “HOW TO
ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION”.
For malfunctions in which 1st trip DTCs are displayed, refer to “EMISSION-RELATED DIAGNOSTIC INFOR-
MATION ITEMS”. These items are required by legal regulations to continuously monitor the system/compo-
nent. In addition, the items monitored non-continuously are also displayed on CONSULT-III.
1st trip DTC is specified in Service $07 of SAE J1979. 1st trip DTC detection occurs without lighting up the MIL
and therefore does not warn the driver of a malfunction. However, 1st trip DTC detection will not prevent the
vehicle from being tested, for example during Inspection/Maintenance (I/M) tests.
When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame
data as specified in Work Flow procedure Step 2, refer to

EC-487, "Trouble Diagnosis Introduction"

. Then per-

form DTC Confirmation Procedure or Overall Function Check to try to duplicate the malfunction. If the mal-
function is duplicated, the item requires repair.

How to Read DTC and 1st Trip DTC

DTC and 1st trip DTC can be read by the following methods.

With CONSULT-III

ETC MOT PWR-B1

P2100

2100

—

1

×

EC-823

ETC FUNCTION/CIRC-B1

P2101

2101

—

1

×

EC-826

ETC MOT PWR

P2103

2103

—

1

×

EC-823

ETC MOT-B1

P2118

2118

—

1

×

EC-830

ETC ACTR-B1

P2119

2119

—

1

×

EC-832

APP SEN 1/CIRC

P2122

2122

—

1

×

EC-834

APP SEN 1/CIRC

P2123

2123

—

1

×

EC-834

APP SEN 2/CIRC

P2127

2127

—

1

×

EC-837

APP SEN 2/CIRC

P2128

2128

—

1

×

EC-837

TP SENSOR-B1

P2135

2135

—

1

×

EC-841

APP SENSOR

P2138

2138

—

1

×

EC-845

A/F SENSOR1 (B1)

P2A00

2A00

—

2

×

EC-849

A/F SENSOR1 (B2)

P2A03

2A03

—

2

×

EC-849

Items

(CONSULT-III screen terms)

DTC*

1

SRT code

Trip

MIL

Reference

page

CONSULT-III

GST*

2

ECM*

3

EC-924

< ECU DIAGNOSIS >

[VK56DE]

ECM

With GST

CONSULT-III or GST (Generic Scan Tool) Examples: P0340, P0850, P1148, etc.
These DTCs are prescribed by SAE J2012.
(CONSULT-III also displays the malfunctioning component or system.)

No Tools

The number of blinks of the MIL in the Diagnostic Test Mode II (Self-Diagnostic Results) indicates the DTC.
Example: 0340, 0850, 1148, etc.
These DTCs are controlled by NISSAN.
• 1st trip DTC No. is the same as DTC No.
• Output of a DTC indicates a malfunction. However, GST or the Diagnostic Test Mode II do not indi-

cate whether the malfunction is still occurring or has occurred in the past and has returned to nor-
mal. CONSULT-III can identify malfunction status as shown below. Therefore, using CONSULT-III (if
available) is recommended.

DTC or 1st trip DTC of a malfunction is displayed in SELF-DIAGNOSTIC RESULTS mode of CONSULT-III.
Time data indicates how many times the vehicle was driven after the last detection of a DTC.
If the DTC is being detected currently, the time data will be [0].
If a 1st trip DTC is stored in the ECM, the time data will be [1t].

FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA

The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant tem-
perature, short term fuel trim, long term fuel trim, engine speed, vehicle speed, absolute throttle position, base
fuel schedule and intake air temperature at the moment a malfunction is detected.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-III or
GST. The 1st trip freeze frame data can only be displayed on the CONSULT-III screen, not on the GST. For
details, see

EC-542, "CONSULT-III Function (ENGINE)"

.

Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority
for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no
longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-
lowing priorities to update the data.

For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was stored in the 2nd
trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated
from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal-
function is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is
stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or 1st
trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and freeze
frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged in the
ECM memory.
Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM mem-
ory is erased. Procedures for clearing the ECM memory are described in “HOW TO ERASE EMISSION-
RELATED DIAGNOSTIC INFORMATION”.

SYSTEM READINESS TEST (SRT) CODE

System Readiness Test (SRT) code is specified in Service $01 of SAE J1979.
As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of
SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and com-
ponents. Completion must be verified in order for the emissions inspection to proceed.
If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating “INCMP”, use
the information in this Service Manual to set the SRT to “CMPLT”.
In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT
status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains
“CMPLT” until the self-diagnosis memory is erased.

Priority

Items

1

Freeze frame data

Misfire — DTC: P0300 - P0308
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175

2

Except the above items (Includes A/T related items)

3

1st trip freeze frame data