TEST
ACTION
APPLICABILITY
1
Turn the ignition off.
Disconnect the C1 PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING
THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMI-
NALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL
MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.
With a 12-volt test light connected to ground and with special tool #8815 installed,
probe the (F1), (F26) Fused Ignition Switch Output circuits.
Perform the above check with the Ignition key in the off lock position, Ignition on,
engine not running position, and during cranking.
Wiggle the related wire harness while probing the special tool with the test light to
try to interrupt the circuit.
Does the test light illuminate brightly?
All
Yes
→ Go To 2
No
→ Repair the open or excessive resistance in the (F11) Fused
Ignition Switch (Off, Run, Start) circuit. Inspect the related fuse,
if the fuse is open check the circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
2
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary
Using the schematics as a guide, inspect the wire harness and connectors. Pay
particular attention to all Power and Ground circuits.
The Powertrain Control Module is reporting internal errors, view repair to continue.
All
Repair
Replace and program the Powertrain Control Module per Service
Information.
Perform POWERTRAIN VERIFICATION TEST VER - 1.
253
DRIVEABILITY - NGC
P1603-PCM INTERNAL DUAL-PORT RAM COMMUNICATION —
Continued