Isuzu KB P190. Manual - part 300

6E-166  Engine Control System (4JH1) 

DTC P0560 (Symptom Code 1) (Flash Code 35) 

Circuit Description 
The engine control module (ECM) monitors the system
voltage on the ECM main relay load supply voltage
terminal to make sure that the voltage stays within the 
proper range. If the ECM detects an excessively high
system voltage, this DTC will set. 
Condition for Setting the DTC 

•  The ECM detects that the battery voltage feed

circuit voltage is more than 20 volts. 

Action Taken When the DTC Sets 

•  The ECM does not illuminate the malfunction

indicator lamp (MIL) when the diagnostic runs and
fails. 

 

 
Condition for Clearing the DTC 

•  A history DTC clears after 40 consecutive driving 

cycles without a fault. Or clear with the scan tool. 

Diagnostic Aids 

•  A charging system problem may set this DTC. 
•  Jump starting the vehicle or a battery charger may

have set this DTC. 

 
DTC P0560 (Symptom Code 1) (Flash Code 35) 
Schematic Reference: Engine Controls Schematics &
Starting and Charging Schematics 

 

Step Action 

Value(s) 

Yes 

No 

1 

Did you perform the Diagnostic System Check-
Engine Controls? 

 

Go to Step 2 

Go to Diagnostic 

System Check-

Engine Controls 

2 

1.  Install the scan tool. 
2.  Turn OFF the ignition for 30 seconds. 
3.  Start the engine. 
4. Monitor the Diagnostic Trouble Code (DTC) 

Information with the scan tool. 

Does the DTC fail this ignition? 

 

Go to Step 3 

Go to Diagnostic 

Aids 

3 

Was the vehicle recently jump started from 24 volts 
system? 

 

Go to Step 8 

Go to Step 4 

4 

1.  Start the engine and let idle for 30 seconds. 
2.  Observe the System Voltage parameter with the 

scan tool. 

Is the System Voltage parameter less than the 
specified value? 

16 volts 

Go to Diagnostic 

Aids 

Go to Step 5 

5 

Test the charging system. Refer to Diagnosis of The 
Charging System in the Charging System Section. 
Did you find a charging system problem? 

 

Go to Step 6 

Go to Step 7 

6 

Repair the charging system. Refer to Diagnosis of 
The Charging System in the Charging System 
Section. 
Did you complete the repair? 

 

Go to Step 8 

 

7 

Important: Replacement ECM must be 
programmed. 
Replace the ECM. Refer to Engine Control Module 
(ECM) Replacement in this section. 
Did you complete the replacement? 

 

Go to Step 8 

 

8 

1.  Reconnect all previously disconnected harness 

connector(s). 

2.  Clear the DTCs with the scan tool. 
3.  Turn OFF the ignition for 30 seconds. 
4.  Start the engine. 
5.  Observe the System Voltage parameter with the 

scan tool. 

Is the System Voltage parameter less than the 
specified value? 

16 volts 

Go to Step 9 

Go to Step 5 

9 

Observe the DTC Information with the scan tool. 
Are there any DTCs that you have not diagnosed? 

 

Go to Diagnostic 

Trouble Code (DTC) 

List System 

OK 

Engine Control System (4JH1)  6E-167 

DTC P0560 (Symptom Code 2) (Flash Code 35) 

Circuit Description 
The engine control module (ECM) monitors the system
voltage on the ECM main relay load supply voltage
terminal to make sure that the voltage stays within the
proper range. If the ECM detects an excessively low 
system voltage, this DTC will set. 
Condition for Setting the DTC 

•  The ECM detects that the battery voltage feed

circuit voltage is less than 7 volts. 

Action Taken When the DTC Sets 

•  The ECM does not illuminate the malfunction

indicator lamp (MIL) when the diagnostic runs and
fails. 

 

Condition for Clearing the DTC 

•  A history DTC clears after 40 consecutive driving 

cycles without a fault. Or clear with the scan tool. 

Diagnostic Aids 

•  If an intermittent condition is suspected, refer to

Intermittent Conditions in this section. 

•  A charging system problem may set this DTC. 
 

DTC P0560 (Symptom Code 2) (Flash Code 35) 
Schematic Reference: Engine Controls Schematics &
Starting and Charging Schematics 
Connector End View Reference: Engine Control 
Module (ECM) Connector End Views 

 

Step Action 

Value(s) 

Yes 

No 

1 

Did you perform the Diagnostic System Check-
Engine Controls? 

 

Go to Step 2 

Go to Diagnostic 

System Check-

Engine Controls 

2 

1.  Install the scan tool. 
2.  Turn OFF the ignition for 30 seconds. 
3.  Start the engine. 
4. Monitor the Diagnostic Trouble Code (DTC) 

Information with the scan tool. 

Does the DTC fail this ignition? 

 

Go to Step 3 

Go to Diagnostic 

Aids 

3 

1.  Start the engine and let idle for 30 seconds. 
2.  Load the electrical system by turning ON the 

headlights, A/C, etc. 

3.  Observe the System Voltage parameter with the 

scan tool. 

Is the System Voltage parameter more than the 
specified value? 

10 volts 

Go to Diagnostic 

Aids 

Go to Step 4 

4 

Test the charging system. Refer to Diagnosis of The 
Charging System in the Charging System Section. 
Did you find a charging system problem? 

 

Go to Step 5 

Go to Step 6 

5 

Repair the charging system. Refer to Diagnosis of 
The Charging System in the Charging System 
Section. 
Did you complete the repair? 

 

Go to Step 8 

 

6 

1.  Turn OFF the ignition. 
2.  Disconnect the ECM harness connector. 
3.  Inspect for an intermittent, for a poor connection 

and corrosion on the battery voltage feed at the 
harness connector of the ECM (pin 3 of C-56 
connector). 

4.  Repair or clean the connection(s) as necessary. 
Did you find and correct the condition? 

 

Go to Step 8 

Go to Step 7 

7 

Important: Replacement ECM must be 
programmed. 
Replace the ECM. Refer to Engine Control Module 
(ECM) Replacement in this section. 
Did you complete the replacement? 

 

Go to Step 8 

 

6E-168  Engine Control System (4JH1) 

Step Action 

Value(s) 

Yes 

No 

8 

1.  Reconnect all previously disconnected harness 

connector(s). 

2.  Clear the DTCs with the scan tool. 
3.  Turn OFF the ignition for 30 seconds. 
4.  Start the engine. 
5.  Load the electrical system by turning ON the 

headlights, A/C, etc. 

6.  Observe the System Voltage parameter with the 

scan tool. 

Is the System Voltage parameter more than the 
specified value? 

10 volts 

Go to Step 9 

Go to Step 4 

9 

Observe the DTC Information with the scan tool. 
Are there any DTCs that you have not diagnosed? 

 

Go to Diagnostic 

Trouble Code (DTC) 

List System 

OK 

 
 

Engine Control System (4JH1)  6E-169 

DTC P0560 (Symptom Code A) (Flash Code 35) 

Circuit Description 
The fuel injection pump control unit (PCU) monitors the
system voltage on the engine control module (ECM)
main relay load supply voltage terminal to make sure
that the voltage stays within the proper range. If the
ECM detects an excessively high or low system voltage,
this DTC will set. 
Condition for Setting the DTC 

•  The PCU battery voltage feed circuit voltage is

less than 4.5 volts or more than 27 volts. 

Action Taken When the DTC Sets 

•  The ECM does not illuminate the malfunction

indicator lamp (MIL) when the diagnostic runs and
fails. 

 

Condition for Clearing the DTC 

•  A history DTC clears after 40 consecutive driving 

cycles without a fault. Or clear with the scan tool. 

Diagnostic Aids 

•  If an intermittent condition is suspected, refer to

Intermittent Conditions in this section. 

•  A charging system problem may set this DTC. 
•  Jump starting the vehicle or a battery charger may

have set this DTC. 

Notice:  

•  PCU is part of the fuel injection pump assembly. 
 

DTC P0560 (Symptom Code A) (Flash Code 35) 
Schematic Reference: Engine Controls Schematics &
Starting and Charging Schematics 
Connector End View Reference: Engine Controls
Connector End Views 

 

Step Action 

Value(s) 

Yes 

No 

1 

Did you perform the Diagnostic System Check-
Engine Controls? 

 

Go to Step 2 

Go to Diagnostic 

System Check-

Engine Controls 

2 

1.  Install the scan tool. 
2.  Turn OFF the ignition for 30 seconds. 
3.  Start the engine. 
4. Monitor the Diagnostic Trouble Code (DTC) 

Information with the scan tool. 

Is DTC P0560 (Symptom Code 1 or 2) set? 

 

Go to Applicable 

DTC 

Go to Step 3 

3 

1.  Start the engine and let idle for 30 seconds. 
2. Monitor the Diagnostic Trouble Code (DTC) 

Information with the scan tool. 

Does the DTC fail this ignition? 

 

Go to Step 4 

Go to Diagnostic 

Aids 

4 

1.  Turn OFF the ignition. 
2.  Disconnect the fuel injection pump control unit 

(PCU) harness connector. 

3.  Inspect for an intermittent, for poor connections 

and corrosion on the voltage feed or ground at 
the harness connector of the PCU (pins 6 and 7 
of E-6 connector). 

4.  Repair or clean the connection(s) as necessary. 
Did you find and correct the condition? 

 

Go to Step 6 

Go to Step 5 

5 

Important: The fuel injection pump must be timed to 
the engine. 
Replace the fuel injection pump. Refer to Fuel 
Injection Pump Replacement in engine mechanical 
section. 
Did you complete the replacement? 

 

Go to Step 6 

 

6 

1.  Reconnect all previously disconnected harness 

connector(s). 

2.  Clear the DTCs with the scan tool. 
3.  Turn OFF the ignition for 30 seconds. 
4.  Start the engine and let idle for 30 seconds. 
5.  Monitor the DTC Information with the scan tool. 
Did the DTC fail this ignition? 

 

Go to Step 2 

Go to Step 7