Hummer H3. Manual — part 36

Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the battery

terminals. The voltage should be between 12.6 and 15.0 volts.

If not within the specified range, refer to Charging System Test.

2. Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between

12.6 and 15.0 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the ECM.

2. Ignition OFF, test for less than 5 ohms between the ground circuit terminal 73 X2 and

ground:

If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminal 20 X1 and ground:

If the test lamp does not illuminate, test the B+ circuit for a short to ground or an
open/high resistance.

4. Verify that a test lamp illuminates between the ignition circuit terminals listed below and

ground:

Terminal 19 X1

Terminal 13 X2

If the test lamp does not illuminate, test the ignition circuit for a short to ground or an
open/high resistance.

5. If all circuits test normal, replace the EBCM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming

DTC P0563

2008 Hummer H3

2008 ENGINE Engine Electrical - H3

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0563

System Voltage High - ECM

Diagnostic Fault Information

Circuit/System Description

The engine control module (ECM) monitors the system voltage to ensure that the voltage stays
within the proper range. Damage to components, and incorrect data may occur when the voltage
is out of range.

Conditions for Running the DTC

The vehicle speed is above 8 km/h (5 mph).

The system voltage is between 9.5-18 volts.

Conditions for Setting the DTC

The ECM detects a system voltage greater than 16 volts for less than 1 second.

Action Taken When the DTC Sets

DTC P0563 is a C type DTC.

Conditions for Clearing the DTC

DTC P0563 is a C type DTC.

Diagnostic Aids

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

Ignition 1

P0562

P0562

-

-

Ground

-

P0562

-

-

2008 Hummer H3

2008 ENGINE Engine Electrical - H3

A possible cause of this DTC could be overcharging with a battery charger or jump starting.

A high voltage value in multiple modules indicates a concern in the charging system.

Reference Information

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Charging System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the battery

terminals. The voltage should be between 12.6 and 15.0 volts.

If not within the specified range, refer to Charging System Test.

2. Observe the scan tool ECM Ignition 1 Signal parameter. The reading should be between

12.6 and 15.0 volts.

If not within the specified range, replace the ECM.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

2008 Hummer H3

2008 ENGINE Engine Electrical - H3

Control Module References for ECM replacement, setup, and programming

DTC P0615

Diagnostic Instructions

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0615

Starter Relay Control Circuit - PCM CNTRL Relay

Diagnostic Fault Information

Circuit/System Description

When the ignition switch is placed in the START position, a discrete signal is supplied to the
body control module (BCM) notifying it that the ignition is in the START position. The BCM
then sends a message to the engine control module (ECM) that crank has been requested. The
ECM then verifies that the transmission is in Park or Neutral. If it is, then the ECM then supplies
12 volts to the control circuit of the PCM CNTRL relay. When this occurs, battery voltage is
supplied through the switch of the PCM CNTRL relay to the terminal A X1 of the starter
solenoid. The ECM always supplies some voltage to the control circuit of the PCM CNTRL
relay, through a pull-up resistor. If the circuit becomes open or shorted, then the ECM will set
DTCs.

Conditions for Running the DTC

The ignition is ON.

The system voltage is between 9.5-18 volts.

Conditions for Setting the DTC

Circuit

Short to

Ground

Open/High

Resistance

Short to

Voltage

Signal

Performance

Control

P0615

P0615

P0615

-

Ground

-

P0615

-

-

2008 Hummer H3

2008 ENGINE Engine Electrical - H3