Hummer H1 (2006+). Manual — part 70
OBD-124
On-Board Diagnostics
_____________________________________________
5
WARNING: This System Uses High Voltage
NOTE: Failure to identify the correct cylinder will result in mis-
diagnosis. Use the J 35616-94 adapters to probe the fuel injection
control module (FICM) connector.
1.
Turn OFF the ignition.
2.
Disconnect the FICM.
3.
Measure the resistance between the injector supply voltage
circuit for cylinders 2, 3, 5, and 8 and a known good ground
with a DVOM.
Does the DVOM display OL?
Go to Step 7
Go to Step 6
6
Disconnect cylinders 2, 3, 5, and 8 harness connectors for each of
the fuel injectors one at a time, while monitoring the DVOM.
Does the DVOM display OL when any of the fuel injector har-
ness connectors are disconnected?
Go to Step 21
Go to Step 30
7
NOTE:
• The DVOM and test leads must be calibrated to 0 ohms in
order to prevent misdiagnosis. Use the DVOM to per-
form this test. Refer to the DVOM User Manual for
calibration procedure.
• The temperature of the engine and injectors should be the
same as when the DTC set.
• Use the J 35616-94 adapters to probe the FICM connector.
Measure the resistance between the injector supply voltage cir-
cuit and the injector command circuits for cylinders 2, 3, 5, and 8
with a DVOM.
Does the DVOM display OL for all of the circuits?
Go to Step 31
Go to Step 8
8
Does the DVOM display OL for any of the circuits?
Go to Step 22
Go to Step 9
9
Does the DVOM display a resistance above the specified value
for any fuel injector circuit?
0.8 ohms
Go to Step 24
Go to Step 10
10
Does the DVOM display a resistance below the specified value
for any fuel injector circuit?
0.3 ohms
Go to Step 25
Go to Step 11
11
NOTE: Use the J 35616-94 adapters to probe the FICM connec-
tor.
1.
Turn ON the ignition, with the engine OFF.Probe the injector
supply voltage circuit for cylinders 2, 3, 5 and 8, with a
DVOM connected to ground.
Does the DVOM display battery voltage?
Go to Step 12
Go to Step 33
12
Disconnect cylinders 2, 3, 5, and 8 harness connectors for each of
the fuel injectors one at a time, while monitoring the DVOM.
Does the DVOM display the specified voltage when any of the
fuel injector harness connectors are disconnected?
0 Volts
Go to Step 28
Go to Step 27
Step
Action
Value(s)
Yes
No
_____________________________________________
On-Board Diagnostics OBD-125
5745804
13
WARNING: Refer to High Voltage Caution in Cautions
and Notices.
NOTE:
• Use the J 35616-94 adapters to probe the FICM connector.
• Failure to identify the correct cylinder will result in misdi-
agnosis.
1.
Turn OFF the ignition.
2.
Disconnect the FICM.
3.
Measure the resistance between the injector supply voltage
circuit for cylinders 1, 4, 6, and 7 and a known good ground
with a DVOM.
Does the DVOM display OL?
Go to Step 15
Go to Step 14
14
Disconnect cylinders 1, 4, 6, and 7 harness connectors for each of
the fuel injectors one at a time, while monitoring the DVOM.
Does the DVOM indicate OL when any of the fuel injector har-
ness connectors are disconnected?
Go to Step 21
Go to Step 30
15
NOTE:
• Use the J 35616-94 adapters to probe the FICM connector.
• The DVOM and test leads must be calibrated to 0 ohms in
order to prevent misdiagnosis. Refer to the DVOM
User Manual for calibration procedure.
• The temperature of the engine and injectors should be the
same as when the DTC set.
Measure the resistance between the injector supply voltage cir-
cuit and the injector command circuits for cylinders 1, 4, 6 and 7
with a DVOM.
Does the DVOM display OL for all of the circuits?
Go to Step 31
Go to Step 16
16
Does the DVOM display OL for any of the circuits?
Go to Step 22
Go to Step 17
17
Does the DVOM display a resistance above the specified value
for any fuel injector circuit?
0.8 ohms
Go to Step 24
Go to Step 18
18
Does the DVOM display a resistance below the specified value
for any fuel injector circuit?
0.3 ohms
Go to Step 25
Go to Step 19
19
NOTE: Use the J 35616-94 adapters to probe the FICM connec-
tor.
1.
Turn ON the ignition, with the engine OFF.
2.
Probe the injector supply voltage circuit for cylinders 1, 4, 6
and 7, with a DVOM connected to ground.
Does the DVOM display battery voltage?
Go to Step 20
Go to Step 33
Step
Action
Value(s)
Yes
No
OBD-126
On-Board Diagnostics
_____________________________________________
20
Disconnect cylinders 1, 4, 6, and 7 harness connectors for each of
the fuel injectors one at a time, while monitoring the DVOM.
Does the DVOM display the specified voltage when any of the
fuel injector harness connectors are disconnected?
0 Volts
Go to Step 28
Go to Step 27
21
Measure the resistance from the fuel injector command circuit to
ground at the FICM connector for the cylinder that caused the
DVOM to display OL.
Does the DVOM display continuity?
Go to Step 29
Go to Step 26
22
1.
Disconnect the connector of the fuel injector that displayed
OL.
2.
Test the command circuit of the fuel injector between the
FICM and the injector connector, for the following condi-
tions:
• An open circuit
• A poor connection
Did you find and correct the condition?
Go to Step 35
Go to Step 23
23
Test the injector voltage circuit of the fuel injector, between the
injector connector and the splice, for the following conditions:
• An open circuit
• A poor connection
Did you find and correct the condition?
Go to Step 35
Go to Step 26
24
1.
Disconnect the injector connector for the circuit with high
resistance.
2.
Test for the following conditions:
• Excessive resistance in the fuel injector circuits between
the FICM and the injector connector
• Poor connections at the injector connector of the fuel in-
jector
Did you find and correct the condition?
Go to Step 35
Go to Step 25
25
Test for a short between the injector supply voltage circuit and
the fuel injector command circuit.
Did you find and correct the condition?
Go to Step 35
Go to Step 26
26
Test for an intermittent and for a poor connection at the harness
connector of the fuel injector.
Did you find and correct the condition?
Go to Step 35
Go to Step 32
27
Repair the short to voltage in the injector supply voltage circuit.
Did you complete the repair?
Go to Step 35
28
Repair the short to voltage in the fuel injector command circuit
that changed to 0 volts on the DVOM.
Did you complete the repair?
Go to Step 35
29
Repair the short to ground in the fuel injector command circuit.
Did you complete the repair?
Go to Step 35
Step
Action
Value(s)
Yes
No
_____________________________________________
On-Board Diagnostics OBD-127
5745804
30
Repair the short to ground in the injector supply voltage circuit.
Did you complete the repair?
Go to Step 35
31
Repair the open in the injector supply voltage circuit.
Did you complete the repair?
Go to Step 35
32
Replace the appropriate faulty fuel injector.
Did you complete the replacement?
Go to Step 35
33
Test for an intermittent and for a poor connection at the harness
connector of the FICM.
Did you find and correct the condition?
Go to Step 35
34
Replace the faulty FICM.
Did you complete the replacement?
Go to Step 35
35
1.
Clear the DTCs with a scan tool.
2.
Turn OFF the ignition for 30 seconds.
3.
Start the engine.
4.
Operate the vehicle within the Conditions for Running the
DTC. You may also operate the vehicle within the conditions
that you observed from the Freeze Frame/Failure Records.
Did the DTC fail this ignition?
Go to Step 2
Go to Step 18
36
1.
Using the Scan Tool select “Capture Info,” Review Info.” Are
any DTC’s displayed that have not been diagnosed?
Go to the appli-
cable DTC
table.
System OK.
Step
Action
Value(s)
Yes
No
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