Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
P1604-PCM INTERNAL DUAL-PORT RAM READ/WRITE INTEGRITY FAILURE DIAGNOSTIC TEST REFERENCE
| 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 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 (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? 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 . |
All |
| 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.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 1 . |
All |