Hummer H1 Service Manual page 1153

88 PCM/Tech 1 Scan Tool
DTC P0380 - Glow Plug Circuit Performance
Step
26 Repair the open or poor connections in the glow plug harness.
Did you complete the repair?
27 Repair the short to ground in the glow plug harness.
Did you complete the repair?
28 Replace the glow plug relay.
Did you complete the repair?
29 THE NEW PCM MUST BE PROGRAMMED.Replace the PCM.
Did you complete the repair?
30 Use a scan tool to clear the DTC's. Start the engine. Allow the engine to idle until
the engine reaches normal operating temperature. Select the DTC and the specific
DTC function. Enter the DTC number which was set. Operate the vehicle, with the
Conditions for Setting this DTC, until the scan tool indicates the diagnostic Ran.
Does the scan tool indicate the diagnostic Passed?
31 Does the scan tool display any addition undiagnosed DTC's?
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Action Value Yes
Go to step
30.
Go to step
30.
Go to step
30.
Go to step
30.
Go to step Go to step
31.
Go to the System
applicable
DTC table.
®
No
2.
OK.