Hummer H3. Manual — part 3

Generator Connector Terminal Identification

DIAGNOSTIC INFORMATION AND PROCEDURES

DIAGNOSTIC CODE INDEX

DIAGNOSTIC CODE INDEX

DIAGNOSTIC STARTING POINT - ENGINE ELECTRICAL

Begin the system diagnosis with the Diagnostic System Check - Vehicle in Vehicle DTC
Information. The Diagnostic System Check will provide the following information:

The identification of the control modules which command the system

The ability of the control modules to communicate through the serial data circuit

The identification of any stored DTCs and their status

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the
system and where the procedure is located.

SCAN TOOL OUTPUT CONTROLS

Powertrain Control Module

Pins:

Terminal:

Core/Insulation Crimp:

Release Tool/Test Probe:

Pin

Wire Color

Circuit No.

Function

A

-

-

Not Available

B

RD

225

Generator Turn On Signal

C

GY

23

Generator Field Duty Cycle Signal

D

-

-

Not Available

DTC

Description

DTC P0562

System Voltage Low

DTC P0563

System Voltage High

DTC P0621

Generator L-Terminal Circuit

DTC P0622

Generator F-Terimal Circuit

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

SCAN TOOL DATA LIST

Powertrain Control Module (PCM)

SCAN TOOL DATA DEFINITIONS

Generator L Terminal Signal

The scan tool displays OK/No Output. The scan tool displays OK until malfunction is
detected on the generator L terminal circuit, then it reads No Output.

Generator F Terminal Signal

The scan tool displays 0-100 percent. The scan tool displays 0-5 percent until the engine is
running, then the percentage value varies depending on electrical loads.

Ignition 1 Signal

The scan tool displays system voltage received by the module.

DTC P0562

Circuit Description

The powertrain control module (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

Scan Tool

Output Control

Additional Menu

Selection(s)

Description

GEN L Terminal

-

The PCM commands the generator Off when you
select Off. The Generator will stop generating an
output voltage.

Scan Tool Parameter

Data List

Units Displayed

Typical Data

Value

Ignition ON/Engine OFF

Generator L Terminal Signal

Engine 2

OK/No Output

OK

Generator F Terminal Signal

Engine 2

%

10 - 90%

Ignition 1 Signal

Engine 1,2,3

volts

9.6 - 14.4v

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

the charge indicator will light.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0562 System Voltage Low

Conditions for Running the DTC

Engine run time is more than 20 seconds and above 1,200 RPM.

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

Conditions for Setting the DTC

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

Action Taken When the 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 IPC displays a message.

The malfunction indicator lamp (MIL) will not illuminate.

Conditions for Clearing the DTC

The Conditions for Setting the DTC are no longer present.

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

The PCM receives the clear code command from the scan tool.

DTC P0562

Step

Action

Values

Yes

No

Schematic Reference: Starting and Charging Schematics
Connector End View Reference: Engine Electrical Connector End Views

Did you perform the Diagnostic System
Check - Vehicle?

Go to

Diagnostic

2006 Hummer H3

2006 ENGINE Engine Electrical - H3

1

-

Go to Step 2

System

Check -

Vehicle in

Vehicle DTC

Information

2

With the scan tool monitor the ignition 1
signal voltage in the powertrain control
module (PCM) data list.
Does the scan tool display ignition 1
voltage greater than the specified value?

11 V

Go to Step 4 Go to Step 3

3

Test the ignition feed circuit to the PCM
for high resistance or open. Refer to
Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

-

Go to Step 7 Go to Step 5

4

1. Inspect for poor connections at the

PCM. Refer to Testing for
Intermittent Conditions and Poor
Connections in Wiring Systems.

2. If you find a poor connection, repair

the condition as necessary. Refer to
Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

-

Go to Step 7 Go to Step 6

5

Repair the ignition feed circuit to the PCM
for an open or a short to ground. Refer to
Wiring Repairs in Wiring Systems.
Is the action complete?

-

Go to Step 7

-

6

Replace the PCM. Refer to Control
Module References in
Computer/Integrating Systems for
replacement, setup, and programming.
Did you compete the replacement?

-

Go to Step 7

-

7

1. Select the DTC option and the Clear

DTC Information option using the
scan tool.

2. Operate the vehicle within the

Conditions for Running the DTC as

-

2006 Hummer H3

2006 ENGINE Engine Electrical - H3