Hummer H1 Service Manual page 1120

_____________________________________________________
®
DTC P0222 - Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage
Step
1 Important: Before clearing DTC(s) use the scan tool "Capture Info".
Was the "On-Board Diagnostic (OBD) System Check" performed?
2 1. Ignition "ON", engine "OFF".
2. With the throttle closed, observe APP 2 voltages on the scan tool.
Is APP 2 voltage less than or equal to the specified value?
3 DTC is intermittent..
Are additional DTCs stored?
4 1. Disconnect the APP sensor electrical connector.
2. Jumper APP 2 5 volt reference circuit and the APP 2 signal together at
the APP sensor harness connector.
3. Observe the APP 2 voltage on the Scan Tool.
Is APP 2 voltage greater than the specified value?
5 1. Connect a test light between B+ and the APP 1 sensor signal circuit at
the APP sensor harness connector.
2. Observe the APP 2 voltage on the Scan Tool.
Is APP 2 voltage greater than the specified value?
6 1. Ignition "OFF".
2. Disconnect the PCM and check the 5 volt reference circuit for an open or
short to ground.
3. If the 5 volt reference circuit is open or shorted to ground, repair as nec-
essary.
Was the 5 volt reference circuit open or shorted to ground?
7 Check the 5 volt reference circuit for a poor connection at the PCM and
replace terminal if necessary. Did the terminal require replacement?
8 1. Ignition "OFF".
2. Disconnect PCM, and check APP 2 signal circuit for short to ground.
3. Repair as necessary.
Was APP 2 signal circuit open or shorted to ground?
9 Check the APP 2 sensor signal circuit for a poor connection at the PCM and
replace terminal if necessary. Did the terminal require replacement?
10 Replace the APP module.
Is Action complete?
11 Replace the faulty PCM.
Is the action complete?
12 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?
13 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 55
Value(s) Yes
— Go to Step 2. Go to OBD Sys-
.25v Go to Step 3. Go to Step 4.
— Go to the
DTC table.
4.75v Go to Step 10. Go to Step 5.
4.75v Go to Step 6.
— Go to Step 12. Go to Step 7.
— Go to Step 12. Go to Step 11.
— Go to Step 12. Go to Step 9.
— Go to Step 12. Go to Step 11.
— Go to Step 12.
— Go to Step 12.
— Go to Step 13. Go to Step 2.
— Go to the
DTC table
No
tem Check.
Go to
Diagnostic
Aids.
Go to Step 8.
—
—
System OK