Isuzu KB P190. Service manual - part 593

6E–202

ENGINE DRIVEABILITY AND EMISSIONS

DIAGNOSTIC TROUBLE CODE (DTC) P0562 SYSTEM VOLTAGE LOW

Condition for setting the DTC and action taken when the DTC sets

Circuit Description

The engine control module (ECM) monitors the system
voltage on the ignition feed terminal to the ECM. A
system voltage Diagnostic Trouble Code will set
whenever the voltage is below a calibrated value.

Diagnostic Aids

• If the Diagnostic Trouble Code sets when an

accessory is operated, check for a poor connection or
excessive current draw.

• Check for open circuits or shorts to ground on the

ECM’s battery or ignition inputs.

Diagnostic Trouble Code (DTC) P0562 System Voltage Low

Code

Type

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

P0562

D

System Voltage Low

Battery voltage is below 11V.

No fail-safe function.

Step

Action

Value(s)

Yes

No

1

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go  to  Step 2

Go to On Board 

Diagnostic 

(OBD) System 

Check

ENGINE DRIVEABILITY AND EMISSIONS

6E–203

2

1. Connect the Tech 2. 

2. Review and record the failure information. 

3. Select “F0: Read DTC Infor By Priority” in “F0:

Diagnostic Trouble Code”. 

Is the DTC P0562 stored as “Present Failure”?

—

Go to Step 3

Refer to 

Diagnostic Aids 

and Go to Step 

3

3

1. Using the Tech2, ignition “On” and engine “Off”. 

2. Select “Clear DTC Information” with the Tech2 and

clear the DTC information. 

3. Operate the vehicle and monitor the “F5: Failed

This Ignition” in “F2: DTC Information”.

Was the DTC P0562 stored in this ignition cycle?

—

Go to Step 4

Refer to 

Diagnostic Aids 

and Go to Step 

4

4

1. Using the Tech 2, ignition “On” and engine “On”. 

2. Monitor the “Ignition Voltage” in the data display. 

3. Load the electrical system by turning on the

headlights, etc.. 

Does the Tech 2 indicate enough ignition voltage?   

10 - 14.5V

Go to Step 6

Go to Step 5

5

Using the DVM and check the battery voltage at the
battery terminal. 
Does the tester indicate enough battery voltage? 

10 - 14.5V

Go to Step 6

Check the 

charging 

system, charge 

or replace the 

battery

6

Check for poor/faulty connection at the ECM
connector. If a poor/faulty connection is found, repair
as necessary. 
Was the problem found?

—

Verify repair

Go to Step 7

7

Check for poor/faulty connection of the ECM ground
at the inlet manifold. If a poor/faulty connection is
found, repair as necessary. 
Was the problem found?

—

Verify repair

Go to Step 8

8

Is the ECM programmed with the latest software
release? 
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”. 
Was the problem solved?

—

Verify repair

Go to Step 9

9

Replace the ECM. 
Is the action complete? 
IMPORTANT:  The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual. 
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure.

—

Verify repair

—

Step

Action

Value(s)

Yes

No

16

2

17

1

2

C-56(J2)

E-60(J1)

E-72

6E–204

ENGINE DRIVEABILITY AND EMISSIONS

DIAGNOSTIC TROUBLE CODE (DTC) P0563 SYSTEM VOLTAGE HIGH

Condition for setting the DTC and action taken when the DTC sets

Circuit Description

The engine control module (ECM) monitors the system
voltage on the ignition feed terminals to the ECM. A
system voltage Diagnostic Trouble Code will set

whenever the voltage is above a calibrated value.

Diagnostic Aids

Check for a faulty charging system components.

Diagnostic Trouble Code (DTC) P0563 System Voltage High

Code

Type

DTC Name

DTC Setting Condition

Fail-Safe (Back Up)

P0563

A

System Voltage High

Battery voltage is above 16V.

No fail-safe function.

Step

Action

Value(s)

Yes

No

1

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go  to  Step 2

Go to On Board 

Diagnostic 

(OBD) System 

Check

ENGINE DRIVEABILITY AND EMISSIONS

6E–205

2

1. Connect the Tech 2. 

2. Review and record the failure information. 

3. Select “F0: Read DTC Infor By Priority” in “F0:

Diagnostic Trouble Code”. 

Is the DTC P0563 stored as “Present Failure”?

—

Go to Step 3

Refer to 

Diagnostic Aids 

and Go to Step 

3

3

1. Using the Tech2, ignition “On” and engine “Off”. 

2. Select “Clear DTC Information” with the Tech2 and

clear the DTC information. 

3. Operate the vehicle and monitor the “F5: Failed

This Ignition” in “F2: DTC Information”.

Was the DTC P0563 stored in this ignition cycle?

—

Go to Step 4

Refer to 

Diagnostic Aids 

and Go to Step 

4

4

1.  Using the Tech 2, ignition “On” and engine “On”. 

2. Monitor the “Ignition Voltage” in the data display. 

3. Load the electrical system by turning on the

headlights, etc.. 

Does the Tech 2 indicate correct ignition voltage?   

Less than 16V

Go to Step 5

Check the 

charging 

system and Go 

to Step 5

5

Is the battery jamp start cable incorrectly connecting?

—

Verify 

procedure

Go to Step 6

6

Is the ECM programmed with the latest software
release? 
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”. 
Was the problem solved?

—

Verify repair

Go to Step 7

7

Replace the ECM. 
Is the action complete? 
IMPORTANT:  The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual. 
Following ECM programming, the immobilizer system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobilizer System-ECM replacement” for
the ECM/Immobilizer linking procedure.

—

Verify repair

—

Step

Action

Value(s)

Yes

No