Hummer H1 Service Manual page 1124

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DTC P0225 - Accelerator Pedal Position (APP) Sensor 3 Circuit
Step
1 Important: Before clearing DTC(s) use the scan tool "Capture Info" to
record Freeze Frame and Failure Record for reference, as data will be lost
when "Clear Info" function is used.
Was the "On-Board Diagnostic (OBD) System Check" performed?
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?
3 DTC is intermittent. If no additional DTCs are stored, refer to "Diagnostic
Aids". If additional DTCs were stored, refer to those chart(s).
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 as necessary
Was the 5 volt reference circuit shorted to ground?
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?
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?
7 Using the Scan Tool, select "Capture Info", "Review Info".
Are any DTCs displayed that have not been diagnosed?
05745159
Action
PCM/Tech 1 Scan Tool 59
Value(s) Yes
— Go to Step 2. Go to OBD Sys-
4.8v Go to Step 4. Go to Step 3.
— Go to the
applicable
DTC table.
.25v Go to Step 6. Go to Step 5.
— Go to Step 6.
— Go to Step 7.
— Go to the
applicable
DTC table
No
tem Check.
Go to
Diagnostic
Aids.
—
Go to Step 2.
System OK