P1652 J1850 SHORT TO GROUND

When Monitored and Set Condition:

When Monitored: While the ignition is on.
Set Condition: The ECM detects a short to ground on the J1850.

POSSIBLE CAUSES

• ECM
• (D25) J1850 SHORTED
• COMMUNICATION

DIAGNOSTIC PROCEDURE

1. Turn the ignition off. Disconnect the ECM harness connectors.
   NOTE: Check connectors - Clean/repair as necessary.
   Measure the resistance between the (D25) J1850 circuit in the ECM harness connector and battery negative. Is the resistance less than 10 Ohms?
   Yes --> Go To 2
   No --> Replace the ECM.
2. Measure the resistance between the (D25) J1850 circuit and all other circuits in both ECM connectors. Is the resistance greater than 100k ohms?
   Yes --> Refer to the Body Diagnostic under Communications.
   No --> Repair (D25) J1850 shorted to another circuit.