Hummer H1 (2002+). Manual - part 292
____________________________________________________
PCM/Tech 1 Scan Tool 101
®
05745159
DTC P1125 - Accelerator Pedal Position (APP) System
Step
Action
Value(s)
Yes
No
1
Important:
Before clearing DTC(s) use the scan tool “Capture Info” to
record freeze frame and failure records for reference, as data will be lost
when “Clear Info” function is used.
Was the “On-Board Diagnostic (OBD) System Check” performed?
—
Go to Step 2.
Go to OBD
System Check.
2
1. Disconnect the APP sensor electrical connector.
2. Ignition “ON”, engine “OFF”.
3. With J–39200 connected to ground, check all APP 5 volt reference cir-
cuits at APP harness.
Is voltage less than specified value?
4.8v
Go to Step 4.
Go to Step 3.
3
DTC is intermittent. If no additional DTCs are stored, refer to “Diagnostic
Aids”. If additional DTCs are stored, refer to those charts(s) first.
Are additional DTCs stored?
—
Go to the
applicable
DTC table
Go to
Diagnostic
Aids
4
1. Ignition “OFF”.
2. Disconnect the PCM and check the 5 volt reference circuit for a short to
ground.
3. If the 5 volt reference circuit is shorted to ground, repair it as necessary.
Was the 5 volt reference circuit is shorted to ground?
—
Go to Step 6.
Go to Step 5.
5
Replace the faulty PCM. Notice: If the PCM is faulty, the new PCM must
be programmed. Go to PCM replacement and programming procedures.
Is the action complete?
—
Go to Step 6.
—
6
1. Using the Scan Tool, select “DTC”, “Clear Info”.
2. Start engine and idle at normal operating temperature.
3. Select “DTC”, “Specific”, then enter the DTC number which was set.
4. Operate vehicle within the conditions for setting this DTC as specified
in the supporting text.
Does the Scan Tool indicate that this diagnostic Ran and Passed?
—
Go to Step 7.
Go to Step 2.
7
Using the Scan Tool, select “Capture Info”, “Review Info”.
Are any DTCs displayed that have not been diagnosed?
—
Go to the
applicable
DTC table
System OK.