Isuzu KB P190. Manual - part 449

ENGINE CONTROL SYSTEM (4JK1/4JJ1)   6E-179

6

1.

Turn OFF the ignition.

2.

Disconnect the ECM harness connector.

3.

Inspect the connection on the starter switch
signal circuit at the harness connector of the
ECM (pin 44 of C-58) for corrosion.

4.

Repair the connection(s) as necessary.

Did you complete the action?

—

Go to Step 8

—

7

Repair or replace the ignition switch.

Did you complete the repair or replacement?

—

Go to Step 8

—

8

1.

Reconnect all previously disconnected relay
or harness connector(s).

2.

Clear the DTCs with a scan tool.

3.

Turn OFF the ignition for 30 seconds.

4.

Start the engine.

5.

Operate the vehicle within the Conditions for
Running the DTC. You may also operate the
vehicle within the conditions that you
observed from the Freeze Frame/ Failure
Records.

Did the DTC fail this ignition?

—

Go to Step 2

Go to Step 9

9

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

Step

Action

Value(s)

Yes

No

6E-180   ENGINE CONTROL SYSTEM (4JK1/4JJ1)

DTC P0562 or P0563 (Flash Code 35)

Circuit Description

The ECM monitors the ignition voltage on the ignition
feed terminal to make sure that the voltage stays within
the proper range. If the ECM detects an excessively
low or high ignition voltage, DTC P0562 or P0563 will
set.

Condition for Running the DTC

• The battery voltage is more than 9 volts.

Condition for Setting the DTC

• The ECM detects that the ignition voltage feed

circuit is less than 8 volts for 5 seconds. (DTC
P0562)

• The ECM detects that the ignition voltage feed

circuit is more than 16 volts for 5 seconds. (DTC
P0563)

Action Taken When the DTC Sets

• The ECM illuminates the SVS lamp when the

diagnostic runs and fails. Refer to DTC Type
Definitions for Action Taken When the DTC Sets -
Type C. (Euro 4 Specification)

• The ECM illuminates the MIL when the diagnostic

runs and fails. Refer to DTC Type Definitions for
Action Taken When the DTC Sets - Type A.
(Except Euro 4 Specification)

• The ECM limits fuel injection quantity. (DTC

P0563)

• The ECM inhibits pilot injection. (DTC P0563)

• The ECM inhibits cruise control. (DTC P0563)

Condition for Clearing the DTC

• Refer to DTC Type Definitions for Condition for

Clearing the SVS Lamp/ DTC - Type C. (Euro 4
Specification)

• Refer to DTC Type Definitions for Condition for

Clearing the MIL/ DTC - Type A. (Except Euro 4
Specification)

Diagnostic Aids

• A charging system problem may set this DTC.

• The weakened battery may set DTC P0562.

• Jump starting the vehicle or a battery charger may

have set this DTC P0563.

Schematic Reference: Engine Controls Schematics

Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views

Circuit/ System Testing DTC P0562

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 a scan tool.

2.

Turn OFF the ignition for 30 seconds.

3.

Start the engine and let idle.

4.

Load the electrical system by turning ON the
headlights, A/C, etc. while observing the
Ignition Voltage parameter with a scan tool.

Does the scan tool indicate more than the specified
value?

10.0 volts

Go to Diagnostic 

Aids

Go to Step 3

3

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 4

Go to Step 5

4

Repair the charging system. Refer to Diagnosis of
The Charging System in the Charging System
Section.

Did you complete the repair?

—

Go to Step 6

—

ENGINE CONTROL SYSTEM (4JK1/4JJ1)   6E-181

Circuit/ System Testing DTC P0563

5

1.

Turn OFF the ignition.

2.

Disconnect the ECM harness connector.

3.

Inspect for an intermittent, for a poor
connection and for corrosion at the harness
connector of the ECM (pin 72 of C-58).

4.

Repair the connection(s) as necessary.

Did you find and correct the condition?

—

Go to Step 6

Go to Diagnostic 

Aids

6

1.

Reconnect all previously disconnected
harness connector(s).

2.

Clear the DTCs with a scan tool.

3.

Turn OFF the ignition for 30 seconds.

4.

Start the engine and let idle.

5.

Load the electrical system by turning ON the
headlights, A/C, etc. while observing the
Ignition Voltage parameter with a scan tool.

Does the scan tool indicate more than the specified
value?

10.0 volts

Go to Step 7

Go to Step 3

7

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

Step

Action

Value(s)

Yes

No

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

Was the vehicle recently jump started or a battery
charger placed on the battery?

—

Go to Step 7

Go to Step 3

3

1.

Install a scan tool.

2.

Start the engine and let idle.

3.

Observe the Ignition Voltage parameter with
the scan tool.

Does the scan tool indicate less than the specified
value?

16.0 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 Diagnostic 

Aids

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 6

—

6E-182   ENGINE CONTROL SYSTEM (4JK1/4JJ1)

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.

5.

Observe the ignition Voltage parameter with a
scan tool.

Does the scan tool indicate less than the specified
value?

16.0 volts

Go to Step 7

Go to Step 4

7

Observe the DTC Information with a scan tool.

Are there any DTCs that you have not diagnosed?

—

Go to DTC List

System OK

Step

Action

Value(s)

Yes

No