Isuzu KB P190. Service manual — part 274

6E-62 Engine Control System (4JH1)

DTC

(Symptom

Code)

Flash

Code

MIL

Status

DTC Name on

scan tool

Condition for

Running the DTC

Condition for

Setting the DTC

Possible Cause

P1173

(3)

22 OFF

Limitation

of

Injection Quantity

• The ignition switch

is ON.

• The ECM detects

an excessive high
coolant temperature
for longer than 30
seconds.

• Engine overheat.

• Faulty engine cooling system.

• Faulty ECT sensor.

P1173

(7)

22 OFF

Limitation

of

Injection Quantity

• The ignition switch

is ON.

• The ECM detects

an excessive high
FT for longer than
30 seconds.

• Faulty PCU.

P1173

(A)

22 OFF

Limitation

of

Injection Quantity

• The ignition switch

is ON.

• The ECM detects

an excessive low
FT for longer than
30 seconds.

• Faulty PCU.

P1335

(A)

43 ON

Crankshaft
Position (CKP)
Sensor Circuit

• The ignition switch

is ON.

• The PCU detects

CKP sensor signal
from the ECM is
faulty.

• CKP sensor signal output circuit

is open circuit, high resistance,
short to ground, short to battery
or ignition voltage.

• Poor harness connector

connection.

• Faulty PCU.

• Faulty ECM.

P1345

(A)

41 ON

Crankshaft
Position (CKP) –
Camshaft Position
(CMP) Correlation



• The PCU received

faulty fuel injection
pump CMP sensor
signal for 1 second.

• Faulty fuel injection pump.

• Faulty PCU.

P1520

(A)

47 ON

Park/Neutral
Position Switch
Circuit

• The ignition switch

is ON.

• The engine speed

is higher than 1500
RPM.

• The vehicle speed

is higher than 63
km/h (39 MPH)
(M/T) or 78 km/h
(49 MPH) (A/T).

• The clutch pedal is

released. (M/T)

• The ECM detects

that the neutral
switch signal is
continuously ON
(neutral or P/N
range) during three
consecutive driving
cycles.

• Manual Transmission

• Neutral switch signal circuit is

short to battery or ignition
voltage.

• Faulty neutral switch.

• Faulty ECM.

• Automatic Transmission

• P & N position switch signal

circuit is short to battery or
ignition voltage.

• Misadjusted inhibitor switch.

• Faulty inhibitor switch.

• Faulty ECM.

P1520

(B)

47 ON

Park/Neutral
Position Switch
Circuit

• The ignition switch

is ON.

• The engine speed

is higher than 665
RPM

• The vehicle speed

is lower than 2 km/h
(1.2 MPH).

• The clutch pedal is

released after once
depressed.

• The ECM detects

that the neutral
switch signal is
continuously OFF
(other than neutral)
during three
consecutive driving
cycles.

• ECM (10A) fuse (EB-4) open.

• Neutral switch ignition voltage

feed circuit is open circuit or high
resistance.

• Neutral switch signal circuit is

open circuit or high resistance.

• Poor harness connector

connection.

• Faulty neutral switch.

• Faulty ECM.

P1605

(C)

55 ON

Control

Module

Internal
Performance



• The ECM detects

internal seed or key
file in EEPROM
data is destroyed.

• Faulty ECM.

Engine Control System (4JH1) 6E-63

DTC

(Symptom

Code)

Flash

Code

MIL

Status

DTC Name on

scan tool

Condition for

Running the DTC

Condition for

Setting the DTC

Possible Cause

P1605

(D)

55 ON

Control

Module

Internal
Performance



• The ECM detects

reading or writing
from the EEPROM
data is failed during
initialization.

• Faulty ECM.

P1605

(E)

55 ON

Control

Module

Internal
Performance



• The ECM detects

total sum of
EEPROM data is
not equal to
registered value
during initialization.

• Faulty ECM.

P1610

(A)

*1

56 ON

Immobilizer
Function Not
Programmed



• The ECM detects

immobilizer security
code and secret key
is not programmed.

• Immobilizer function is not

programmed into the ECM.

• Faulty ECM.

P1611

(A)

*1

56 ON

Wrong

Security

Code Entered



• The ECM detects

wrong immobilizer
security code is
programmed.

• Programming ECM with wrong

security code.

• Faulty ECM.

P1612

(A)

*1

56 ON

Immobilizer

Wrong

Signal



• The ECM receives

wrong immobilizer
response signal
from the ICU.

• Keyword 2000 communication

line is open circuit, high
resistance, short to ground, short
to battery or ignition voltage.

• Electrical interference.

• Magnetic interference.

• Faulty ECM.

• Faulty ICU.

P1613

(A)

*1

56 ON

Immobilizer

No

Signal



• The ECM does not

receive the
immobilizer
response signal
from the ICU.

• Keyword 2000 communication

line is open circuit, high
resistance, short to ground, short
to battery or ignition voltage.

• Electrical interference.

• Magnetic interference.

• Faulty transponder key.

• Faulty antenna coil.

• Faulty ECM.

• Faulty ICU.

P1614

(A)

*1

56 ON

Wrong
Transponder Key



• The ICU receives

wrong immobilizer
response signal
from the
transponder key.

• Faulty transponder key.

• Faulty ICU.

P1625

(A)

76

OFF ECM Main Relay

Circuit



• The ECM detects

that the ECM main
relay is turned OFF
before commanded
turned OFF.

• ECM main relay control circuit is

intermittently open circuit or high
resistance.

• ECM battery voltage feed circuit

is intermittently open or high
resistance.

• Faulty ECM main relay.

*1: This DTC may be set if the ECM with wrong specification is installed.

6E-64 Engine Control System (4JH1)

DTC

(Symptom

Code)

Flash

Code

MIL

Status

DTC Name on

scan tool

Condition for

Running the DTC

Condition for

Setting the DTC

Possible Cause

P1625

(B)

76

OFF ECM Main Relay

Circuit

• The ignition switch

is OFF.

• The ECM detects

that the ECM main
relay is turned ON
for longer than 2
seconds.

• ECM main relay control circuit is

short to ground.

• ECM battery voltage circuit is

short to battery.

• Faulty ECM main relay.

• Faulty ECM.

P1630

(A)

51 ON

Injection

Pump

Fuel Metering
Control



• The ECM detects

that the PCU
monitored fuel
injection solenoid
valve control
current is too high.

• Faulty fuel injection pump.

• Faulty PCU.

P1630

(B)

51 ON

Injection

Pump

Fuel Metering
Control



• The ECM detects

that the PCU
continuously flow
the control current
to the fuel injection
solenoid valve.

• Faulty fuel injection pump.

• Faulty PCU.

P1650

(A)

44 ON

CAN

Device

Offline



• The ECM detects

that the PCU
receives from the
CAN controller
reset or Bus Offline.

• CAN high circuit is open circuit,

high resistance, short to ground,
short to battery or ignition
voltage.

• CAN low circuit is open circuit,

high resistance, short to ground,
short to battery or ignition
voltage.

• Electrical interference.

• Magnetic interference.

• Faulty PCU.

• Faulty ECM.

P1650

(B)

44

ON

CAN Device Hang-
up



• The ECM detects

internal CAN
controller does not
react.

• Faulty ECM.

P1651

(A)

45 ON

CAN

Malfunction



• The ECM detects

that the PCU does
not receive the CAN
messages from the
ECM.

• CAN high circuit is open circuit,

high resistance, short to ground,
short to battery or ignition
voltage.

• CAN low circuit is open circuit,

high resistance, short to ground,
short to battery or ignition
voltage.

• Electrical interference.

• Magnetic interference.

• Faulty PCU.

• Faulty ECM.

Engine Control System (4JH1) 6E-65

DTC

(Symptom

Code)

Flash

Code

MIL

Status

DTC Name on

scan tool

Condition for

Running the DTC

Condition for

Setting the DTC

Possible Cause

P1651

(B)

45 ON

CAN

Malfunction



• The ECM does not

receive the CAN
messages from the
PCU.

• CAN high circuit is open circuit,

high resistance, short to ground,
short to battery or ignition
voltage.

• CAN low circuit is open circuit,

high resistance, short to ground,
short to battery or ignition
voltage.

• Electrical interference.

• Magnetic interference.

• Faulty PCU.

• Faulty ECM.

P1690

(4)

77 OFF

Malfunction
Indicator Lamp
(MIL) Control
Circuit Low
Voltage

• The ignition switch

is ON.

• The ECM detects a

low voltage
condition on the
MIL control circuit
for longer than 3
seconds when the
MIL is commanded
OFF.

• Meter (15A) fuse (C-14) open.

• MIL ignition voltage feed circuit

is open circuit or high resistance.

• MIL control circuit is open circuit,

high resistance or short to
ground.

• Poor harness connector

connection.

• MIL bulb burned out.

• Faulty instrument panel cluster

(meter assembly).

• Faulty ECM.

P1690

(8)

77 OFF

Malfunction
Indicator Lamp
(MIL) Circuit High
Voltage

• The ignition switch

is ON.

• The ECM detects a

high voltage
condition on the
MIL control circuit
for longer than 1
second when the
MIL is commanded
ON.

• MIL control circuit is short to

battery or ignition voltage circuit.

• Faulty instrument panel cluster

(meter assembly).

• Faulty ECM.