Hummer H1 Service Manual page 288

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Diagnostic Aids
• Inspect the wiring for poor electrical connections at the
PCM and at the transmission 20-way connector. Look
for possible bent, backed out, deformed or damaged ter-
minals. Check for weak terminal tension as well. Also
check for a chafed wire that could short to bare metal or
other wiring. Inspect for a broken wire inside the insula-
tion.
• When diagnosing for a possible intermittent short or
open condition, wriggle the wiring harness while ob-
serving test equipment for a voltage change.
• If any engine DTCs or TP Sensor codes are present di-
agnose and clear these DTCs first. Then check to see if
the transmission DTCs have reset.
Test Description
The numbers below refer to the step numbers on the diagnostic
chart.
2. This test checks the ability of the PCM to command
the PCS.
3. This test checks the PCS and internal wiring harness
for incorrect resistance
05745159
Transmission/Transfer Case 5-89