Isuzu KB P190. Manual - part 274

 

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Isuzu KB P190. 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.  

 

 

 

 

 

 

 

 

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