Hummer H1 Service Manual page 1074

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No Malfunction Indicator Lamp (MIL) "Check Engine"
Step
14 Locate and repair short to ground in the status center
Ignition Feed circuit.
Is the action complete?
15 Replace the PCM.
NOTE: If the PCM is faulty, then PCM must be pro-
grammed. Go to PCM Replacement and Programming
Procedures.
Is the action complete?
16 1. Check the MIL control circuit for a poor connection at
the status center connector.
2. If a problem is found, repair as necessary.
Was a problem found?
17 1. Remove the status center.
2. Inspect the MIL bulb.
Is the bulb OK?
18 Replace the MIL bulb.
Is the action complete?
19 Replace the status center.
Is the action complete?
20 1. Using the Scan Tool, select "DTC," "Clear Info."
2. Attempt to start the engine.
Does the engine start and continue to run?
21 1. Allow engine to idle until normal operating tempera-
ture is reached.
2. Select "DTC," "Failed This Ign."
Are any DTCs displayed?
22 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 9
Value(s) Yes
— Go to Step 20
— Go to Step 20
— Go to Step 20
— Go to Step 19
Go to Step 20
—
— Go to Step 20
Go to Step 21
—
— Go to Applicable
DTC Table
Go to Applicable
—
DTC Table
No
—
—
Go to Step 17
Go to Step 18
—
—
Go to Step 2
Go to Step 22
System OK