Hummer H2. Manual — part 1120
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SYMPTOMS - ENGINE ELECTRICAL
z
Perform Diagnostic System Check - Engine Electrical before using the Symptom Tables in order to
3
engine OFF.
2. Disconnect the generator harness
connector.
3. Measure the voltage between the
generator turn on signal circuit and
ground.
Does the voltage measure near the specified
value?
10-11
volts
Go to Step 5
Go to Step 4
4
Test the generator turn on signal circuit for a
short or open. Refer to Circuit Testing and
Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
-
Go to Step 8
Go to Step 6
5
Inspect for poor connections at the harness
connector of the generator. Refer to
Connector Repairs in Wiring Systems.
Did you find and correct the condition?
-
Go to Step 8
Go to Charging
System Test
(CS/AD/SI
Generators)
6
Inspect for poor connections at the harness
connector of the PCM. Refer to Testing for
Intermittent Conditions and Poor
Connections and Connector Repairs in
Wiring Systems.
Did you find and correct the condition?
-
Go to Step 8
Go to Step 7
7
Replace the PCM/ECM. Refer to
Powertrain Control Module (PCM)
Replacement in Engine Controls 4.8L,
5.3L, and 6.0L.Is action complete?
IMPORTANT:
The replacement PCM must be
programmed.
-
Go to Step 8
-
8
1. Use the scan tool in order to clear the
DTCs.
2. Operate the vehicle within the
Conditions for Running the DTC as
specified in the supporting text.
Does the DTC reset?
-
Go to Step 2
System OK
IMPORTANT: The following steps must be completed before using the symptom tables.
2004 Hummer H2
2004 ELECTRICAL Engine Electrical - Hummer H2
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verify that all of the following are true:
{
There are no DTCs set.
{
The control module(s) can communicate via the serial data link.
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Review the system operation in order to familiarize yourself with the system functions. Refer to one of
the following system operations:
{
Battery Description and Operation
{
Starting System Description and Operation
{
Charging System Description and Operation
Visual/Physical Inspection
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Inspect for aftermarket devices which could affect the operation of the Starting and Charging Systems.
Refer to Checking Aftermarket Accessories in Wiring Systems.
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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 in Wiring Systems.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
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Starter Solenoid Does Not Click
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Starter Solenoid Clicks, Engine Does Not Crank
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Engine Cranks Slowly
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Battery Inspection/Test (Non-HP2)
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Charge Indicator Always On
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Charge Indicator Inoperative
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Charging System Test (CS/AD/SI Generators)
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Generator Noise Diagnosis
BATTERY INSPECTION/TEST (NON-HP2)
Diagnostic Aids
CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
IMPORTANT:
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The battery test using the J 42000 Battery Tester requires correct
2004 Hummer H2
2004 ELECTRICAL Engine Electrical - Hummer H2
Follow these instructions in order to avoid an incorrect diagnosis because of connections:
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If testing the vehicle with the battery cables still connected, wiggle the J 42000 clips on the terminal bolt.
This may cut through any coating or through any oxidation that may be present on the bolt. See Special
Tools and Equipment .
Even new bolts contain a protective coating that may insulate or cause a resistance in the test circuit.
z
If correct connections to the battery terminal bolts in the vehicle are in doubt, perform the following
steps:
1. Disconnect the negative battery cable.
2. Disconnect the positive battery cable.
3. Install the test adapters on the terminals.
4. Follow the instructions for testing a removed battery.
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If the tester displays a REPLACE BATTERY or BAD CELL-REPLACE result for a battery tested in the
vehicle with the battery cables connected, perform the following steps:
1. Disconnect the negative battery cable.
2. Disconnect the positive battery cable.
3. Install the tester adapters.
4. Follow the instructions for testing a removed battery.
5. Replace the battery only if the second test shows a REPLACE BATTERY or BAD CELL-
REPLACE result.
Use the test code from the second test for any warranty purposes.
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Use the correct terminal adapters.
Do not use any common bolts or a combination of bolts, of nuts, and of washers as adapters when testing
the battery.
connections to the battery terminals. A failure to obtain the correct
connections during the test may result in a failed test on a good battery.
See Special Tools and Equipment .
z
Use the Out of Vehicle test for each battery when testing a vehicle with
dual batteries.
IMPORTANT: Always write the test code displayed by the tester on the repair order
for any warranty purposes. The number is a unique code that
describes the test data for a particular battery at a particular time.
The test code may occasionally repeat when you retest the same
battery. More often, each test will result in a different code. Use the
test code from the second, or Out of Vehicle test.
2004 Hummer H2
2004 ELECTRICAL Engine Electrical - Hummer H2
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Use the test adapters that are provided with the J 42000 or GM P/N 12303040 terminal adapters. If the
adapters that are provided with the J 42000 require replacement, use GM P/N 12303040. Any other
adapter may not contact the correct areas of the battery terminal, causing a resistance that may result in an
invalid battery test result. See Special Tools and Equipment .
Battery Inspection/Test (Non-HP2)
Step
Action
Value(s)
Yes
No
CAUTION:
Refer to Battery Disconnect Caution in Cautions and Notices.
1
Inspect the battery for a cracked, broken, or damaged case, which may
be indicated by battery acid leakage.
Is the battery OK?
-
Go to
Step 2
Go to
Step
19
2
Compare the Cold Cranking Amperage (CCA) and Reserve Capacity
(RC) of the battery to the original battery or Original Equipment (OE)
specification. Refer to Battery Usage .
Does the battery meet or exceed the specifications?
-
Go to
Step 3
Go to
Step
19
3
Does the hydrometer display a yellow dot?
-
Go to
Step 4
Go to
Step 5
4
Tap the hydrometer lightly on top with the handle of a small
screwdriver in order to dislodge any air bubbles inside the battery.
Does the hydrometer still display a yellow dot?
-
Go to
Step 19
Go to
Step 5
5
1. Turn OFF the ignition.
2. Attempt to rotate the negative battery cable connector clockwise
with light finger pressure.
Does the negative connector rotate?
-
Go to
Step 6
Go to
Step 7
6
Use a torque wrench in order to verify the torque to loosen the
negative battery terminal bolt.
Is the torque above the specified value?
10 N.m
(88 lb in)
Go to
Step 8
Go to
Step 7
7
Disconnect the negative battery cable.
Is the cable disconnected?
-
Go to
Step 9
-
8
1. Disconnect the negative battery cable.
2. Inspect for the following conditions and repair as needed:
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The cable bolt is too long or deformed at the end.
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There is foreign material present inside the nut in the
battery terminal.
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Damage to the battery terminal face or cable connector
ring.
Is the repair complete?
-
Go to
Step 9
-
9
Rotate the positive battery cable connector clockwise with light finger
pressure.
Does the positive connector rotate?
-
Go to
Step 10
Go to
Step
11
2004 Hummer H2
2004 ELECTRICAL Engine Electrical - Hummer H2
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