Hummer H1 Service Manual page 1168

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DTC P1214 - Injection Pump Timing Offset Error
Step
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?
2 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?
3 Are there any other DTCs set?
4 Clear all codes and reset injection timing until "TDC Offset" is between
specified values. Refer to TDC Offset.
Is timing within specified value?
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 103
Value(s) Yes
— Go to Step 2.
— Go to the
applicable
DTC table
— Go to the
applicable
DTC table
- 0.25 Go to Step 7.
to
- 0.75
— Go to Step 6.
— Go to Step 7.
— Go to the
applicable
DTC table
No
Go to OBD
System Check.
Go to
Diagnostic
Aids
Go to Step 4.
Go to Step 5.
—
Go to Step 3.
System OK.