Hummer H3. Manual — part 37

The ECM detects improper voltage on the control circuit of the PCM CNTRL relay.

Action Taken When the DTC Sets

DTC P0615 is a C type DTC.

Conditions for Clearing the DTC

DTC P0615 is a C type DTC.

Reference Information

Schematic Reference

Starting and Charging Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Starting System Description and Operation

Electrical Information Reference

Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, verify that no immobilizer or automatic transmission DTCs are set that would

2008 Hummer H3

2008 ENGINE Engine Electrical - H3

cause the ECM not to enable engine starting.

2. Clear the DTCs from the ECM. Turn the ignition to the start position. The engine should

crank.

3. Verify that DTC P0615 is not set.

Circuit/System Testing

1. Ignition OFF, disconnect the PCM CNTRL relay.

2. With the ignition OFF and the scan tool disconnected, open and close the drivers door, and

wait 30 seconds. Test for less than 1.5 ohms between the ground circuit terminal 85 and
ground.

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

3. Connect a test lamp between the control circuit terminal 86, and the ground circuit terminal

85.

4. Turn the ignition to the start position. The test lamp should turn ON only when the ignition

is held in the start position, for no greater than 10 seconds.

If the test lamp is always ON, test the control circuit for short to voltage. If the circuit
tests normal, replace the ECM.

If the test lamp is always OFF, test the control circuit for a short to ground or an
open/high resistance. If the circuit tests normal, replace the ECM.

5. If all circuits test normal, test or replace the PCM CNTRL relay.

Component Testing

PCM CNTRL Relay

1. Ignition OFF, disconnect the PCM CNTRL relay.

2. Test for 60-180 ohms between terminals 85 and 86.

If not within the specified range, replace the relay.

3. Test for infinite resistance between the following terminals:

30 and 86

30 and 87

30 and 85

85 and 87

If not the specified value, replace the relay.

4. Install a 20A fused jumper wire between relay terminal 85 and 12 volts. Install a jumper

wire between relay terminal 86 and ground. Test for less than 2.0 ohms between terminals

2008 Hummer H3

2008 ENGINE Engine Electrical - H3

30 and 87.

If greater than specified range, replace the relay.

Repair Procedures

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an
Electrical Center)

Control Module References for ECM replacement, setup, and programming

SYMPTOMS - ENGINE ELECTRICAL

Perform Control Module References before using the Symptom Tables in order to verify
that all of the following are true:

There are no DTCs set.

The control modules can communicate via the serial data link.

Review the system descriptions and operations in order to familiarize yourself with the
system functions. Refer to one of the following system operations:

Battery Description and Operation

Charging System Description and Operation

Electrical Power Management Description and Operation

Starting System Description and Operation

Visual/Physical Inspection

Inspect for aftermarket devices which could affect the operation of the starting and charging
systems. Refer to Checking Aftermarket Accessories .

Inspect the easily accessible or visible system components for obvious damage or conditions
which could cause the symptom.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to
Testing for Intermittent Conditions and Poor Connections .

IMPORTANT: The following steps must be completed before using the symptom

tables.

2008 Hummer H3

2008 ENGINE Engine Electrical - H3

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the
symptom:

Battery Inspection/Test

Battery Electrical Drain/Parasitic Load Test

Battery Common Causes of Malfunction

Charging System Test

Generator Noise Diagnosis

Starter Solenoid Does Not Click (Automatic M30) or Starter Solenoid Does Not Click
(Manual MA5)

Starter Solenoid Clicks, Engine Does Not Crank

Engine Cranks Slowly

Starter Motor Noise Diagnosis

BATTERY INSPECTION/TEST

Special Tools

J 42000 Battery Tester. See Special Tools.

Diagnostic Aids

Follow these instructions in order to avoid an incorrect diagnosis because of connections:

If testing the vehicle with the battery cables still connected, wiggle the J 42000 clips on the
terminal bolt. See Special Tools. This may cut through any coating or through any

CAUTION: Refer to Battery Disconnect Caution .

IMPORTANT:

The battery test using the J 42000 Battery Tester requires
correct connections to the battery terminals. See Special
Tools. A failure to obtain the correct connections during the
test may result in a failed test on a good battery.

Use the Out of Vehicle test for each battery when testing a
vehicle with dual batteries.

2008 Hummer H3

2008 ENGINE Engine Electrical - H3