Hummer H1 Service Manual page 1167

102 PCM/Tech 1 Scan Tool
DTC P1214 Injection Pump Timing Offset
Error
Circuit Description
The PCM has the ability to determine the amount of offset
needed to bring the engine to top dead center. This is used by
the PCM to determine proper injection time.
Conditions for Setting the DTC
TDC offset greater than 2.5 degrees.
or
TDC Offset less than -2.5 degrees.
Action Taken When the DTC Sets
The MIL will illuminate on 2 test failures.
Conditions for Clearing the MIL/DTC
• •The PCM will turn the MIL off after three consecutive
trips without a fault condition.
• •A History DTC will clear when forty consecutive
warm-up cycles that the diagnostic does not fail (coolant
temperature has risen 5° C (40° F) from start up coolant
temperature and engine coolant temperature exceeds
71° C (160° F) that same ignition cycle.
• Use of a Scan Tool.
Diagnostic Aids
The PCM will only run the diagnostic test when a time set pro-
cedure has been activated. It is highly unlikely that the vehicle
will be brought in with this DTC set. Refer to TDC Offset.
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