Hummer H2. Manual - part 1147

5. Use the scan tool in order to clear the DTCs. Operate the vehicle within the CONDITIONS FOR

RUNNING DTC . Does the DTC reset? If yes, go to step 2 . If no, system OK.

DTC P0562

Circuit Description

The PCM monitors the system voltage to make sure that the voltage stays within the proper range. If the PCM
detects an excessively low system voltage, DTC P0562 will set.

When the charging system detects a fault, the Instrument Panel Cluster (IPC) displays a message or the charge
indicator will light.

Conditions For Running DTC

Engine run time more than 20 seconds and above 1200 RPM.

Vehicle speed above 8 km/h (5 mph).

Conditions For Setting DTC

The PCM detects an improper voltage below 11 volts for 5 seconds.

Action Taken When DTC Sets

The PCM stores the DTC information into memory when the diagnostic runs and fails.

The PCM will store conditions which were present when the DTC set as Failure Records data only.

The PCM disables most outputs.

The transmission defaults to a predetermined gear.

The torque converter clutch (TCC) operation is inhibited.

The instrument panel cluster (IPC) displays a message.

The malfunction indicator lamp (MIL) will not illuminate.

Conditions For Clearing DTC

The Conditions for Setting the DTC are no longer present.

A history DTC will clear after 40 malfunction free ignition cycles.

The powertrain control module (PCM) receives the clear code command from the scan tool.

Diagnostic Procedures

1. Did you perform the Engine Electrical Diagnostic System Check? If yes, go to next step. If no, go to

DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL .

2. With the scan tool monitor the Ignition 1 signal voltage in the PCM data list. Does the scan tool display

Ignition 1 voltage greater than the specified value? 11 V. If yes, go to step 4 . If no, go to next step.

2004 Hummer H2

2004 STARTING & CHARGING SYSTEMS Starters - H2

3. Test the ignition feed circuit to the PCM for high resistance or open. Did you find and correct the

condition? If yes, go to step 7 . If no, go to step 5 .

4. Inspect for poor connections at the PCM. If you find a poor connection, repair the condition as necessary.

Did you find and correct the condition? If yes, go to step 7 . If no, go to step 6 .

5. Repair the ignition feed circuit to the PCM for an open or a short to ground. After repairs, go to step 7 .

Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement. After repairs, go to next
step.

7. Select the Diagnostic Trouble Code (DTC) option and the Clear DTC Information option using the scan

tool. Operate the vehicle within the CONDITIONS FOR RUNNING DTC . Does the DTC reset? If yes,
go to step 2 . If no, system OK.

DTC P0563

Circuit Description

The powertrain control module (PCM) continuously monitors that the system voltage stays within the proper
range. If the PCM detects an excessively high system voltage, DTC P0563 will set. A high voltage condition
may cause a stalling condition or other driveability concerns.

Conditions For Running DTC

The engine run time is more than 20 seconds.

Engine running above 1200 RPM.

Vehicle speed above 8 km/h (5 mph).

Conditions For Setting DTC

The PCM senses the system voltage is above 19 volts.

All of the conditions are present for 5 seconds.

Action Taken When DTC Sets

The PCM stores DTC P0563 in the PCM memory when the diagnostic runs and fails.

The PCM will record the operating conditions at the time the diagnostic fails. The PCM stores this
information in Failure Records.

The PCM disables most outputs.

The transmission defaults to a predetermined gear.

The torque converter clutch (TCC) operation is inhibited.

The instrument panel cluster (IPC) displays a message.

The malfunction indicator lamp (MIL) will not illuminate.

NOTE:

The replacement PCM must be programmed.

2004 Hummer H2

2004 STARTING & CHARGING SYSTEMS Starters - H2

Conditions For Clearing DTC

The Conditions for Setting the DTC are no longer present.

A history DTC will clear after 40 malfunction free ignition cycles.

The Powertrain Control Module (PCM) receives the clear code command from the scan tool.

Diagnostic Procedures

1. Did you perform the Engine Electrical Diagnostic System Check? If yes, go to next step. If no, go to

DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL .

2. Turn OFF all the accessories. Measure the battery voltage at the battery using the DMM. Operate the

engine speed above 2000 RPM. Is the battery voltage less than 19 V? If yes, go to step 4 . If no, go to
next step.

3. Replace the generator. Refer to GENERATOR . After replacement, go to step 5 .

Replace the PCM. Refer to Powertrain Control Module (PCM) Replacement. After replacement, go to
next step.

5. Select the Diagnostic Trouble Code (DTC) option and the Clear DTC Information option using the scan

tool. Operate the vehicle within the CONDITIONS FOR RUNNING DTC . Does the DTC reset? If yes,
go to step 2 . If no, system OK.

DTC P0615

Circuit Description

The PCM uses Output Driver Modules (ODMs) to control many functions of the engine. The ODMs supply the
ground path for the PCM controlled device when the PCM commands the device ON. Each ODM is able to
control several outputs. The PCM monitors the ODMs for circuit conditions that are incorrect for the
commanded state of the ODM. If the PCM detects an improper circuit condition in the ODM that controls the
starter relay, DTC P0615 will set.

Conditions For Running DTC

System voltage is between 8-16 volts.

Conditions For Setting DTC

The PCM detects an improper voltage level on the output circuit that controls the starter relay.

The condition exists for at least 2 seconds.

Action Taken When DTC Sets

The PCM will not illuminate the Malfunction Indicator Lamp (MIL).

NOTE:

The replacement PCM must be programmed.

2004 Hummer H2

2004 STARTING & CHARGING SYSTEMS Starters - H2

The PCM will store the conditions present when the DTC set as Fail Records data only.

Conditions For Clearing DTC

The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.

The DTC can be cleared by using the scan tool Clear DTC Information function.

Diagnostic Aids

Ignition system DTCs set with the ignition switch in the START position if the starter relay or the starter is
inoperative. When the PCM enables starter operation, the PCM also initiates the diagnostic test routines for
DTC P0335. If a condition exists which prevents the engine from cranking, the PCM will not receive signal
input from the CKP and CMP sensors, and the DTCs will set.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may assist in diagnosing the
condition. The information may help determine how often the condition that set the DTC occurs.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

2 - Listen for an audible click when the Start 1 relay operates. Turn the ignition switch back and forth
from the ON to START positions. Repeat this as necessary.

3 - Tests for voltage at the coil side of the Start 1 relay. The PCM IGN fuse supplies power to the coil
side of the Start 1 relay.

4 - Verifies that the PCM is providing ground to the Start 1 relay.

5 - Tests if ground is constantly being applied to the Start 1 relay.

Diagnostic Procedures

1. Did you perform the Engine Electrical Diagnostic System Check? If yes, go to next step. If no, go to

DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL .

2. Install a scan tool. Turn ON the ignition, with the engine OFF. Turn the ignition back and forth from the

ON to START positions. Does the Start 1 relay turn ON and OFF with each command? If yes, problem is
intermittent. If no, go to next step.

3. Turn OFF the ignition. Disconnect the Start 1 relay. Turn ON the ignition, with the engine OFF. Probe

the battery positive voltage of the Start 1 relay coil circuit with a test lamp that is connected to a good
ground. Does the test lamp illuminate? If yes, go to next step. If no, go to step 8 .

4. Connect a test lamp between the control circuit of the Start 1 relay and the battery positive voltage of the

Start 1 relay coil circuit. Turn the ignition back and forth from the ON to START positions. Does the test
lamp turn ON and OFF with each command? If yes, go to step 6 . If no, go to next step.

5. Test the control circuit of the Start 1 relay for a short to voltage or an open. Did you find and correct the

condition? If yes, go to step 11 . If no, go to step 7 .

6. Inspect for poor connections at the Start 1 relay. Did you find and correct the condition? If yes, go to step

11 . If no, go to step 9 .

2004 Hummer H2

2004 STARTING & CHARGING SYSTEMS Starters - H2

Content .. 1145 1146 1147 1148 ..