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Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 488 (Powertrain Diagnostic Procedures - Gas) >> Diagnostic Information And Procedures >> DRIVEABILITY - NGC - Symptoms >> Symptom: *CHECKING PCM POWERS AND GROUNDS >> Possible Causes

Possible Causes

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.

(A209) PCM FUSED B+ CIRCUIT

(F1), (F26) PCM FUSED IGNITION SWITCH OUTPUT CIRCUITS

(Z130), (Z131) PCM GROUND CIRCUITS

CHECKING PCM POWERS AND GROUNDS

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.

Using a 12-volt test light connected to ground, probe the (A209) PCM Fused B+ circuit in the appropriate terminals of special tool #8815.
Does the test light illuminate brightly?
Yes --> Go To 2
No --> Repair the open in the (A209) Fused B+ circuit. Inspect the related fuses and repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 1 .		 All
2
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.
Ignition on, engine not running.Using a 12-volt test light connected to ground, probe the (F1), and (F26) PCM Fused Ignition Switch Output (Off, Run, Start) circuits in the appropriate terminals of special tool #8815.Does the test light illuminate brightly?Yes --> Go To 3No --> Repair the open in the (F1), and (F26) Fused Ignition Switch Output (Off, Run, Start) circuit(s). Inspect the related fuses and repair as necessary.Perform POWERTRAIN VERIFICATION TEST VER - 1 .		 All
3 Turn the ignition off.
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.

Using a 12-volt test light connected to battery voltage, probe the (Z130) and (Z131) PCM Ground circuits in the appropriate terminals of special tool #8815.
Does the test light illuminate brightly?
Yes --> Test Complete.
No --> Repair the open in the (Z130) and (Z131) PCM Ground circuit(s).
Perform POWERTRAIN VERIFICATION TEST VER - 1 .		 All
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