P1607-PCM INTERNAL SHUTDOWN TIMER RATIONALITY TOO SLOW

For a complete wiring diagram Refer to Section 8W.



Possible Causes
PCM FUSED IGNITION SWITCH CIRCUIT
PCM INTERNAL

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).



Diagnostic Test

1. PCM IGNITION CIRCUITS



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 terminals 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 (F202) and (F1) Fused Ignition Switch 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?

Yes


No

2. PCM

The Powertrain Control Module is reporting internal errors.

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.

Were there any problems found?

Yes


No