For a complete wiring diagram Refer to Section 8WWhen Monitored:With the ignition on.Set Condition:The ECM detects an open on the (K202) Glow Plug Module Control circuit for 0.5 second.Possible CausesINTERMITTENT DTC(K202) GLOW PLUG MODULE CONTROL CIRCUIT SHORTED TO GROUND(K202) GLOW PLUG MODULE CONTROL CIRCUIT OPEN OR HIGH RESISTANCEGLOW PLUG MODULEAlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)1. DTC IS ACTIVEIgnition on, engine not running.With the scan tool, clear DTCs in the Engine Control Module (ECM).With the scan tool, actuate the Glow Plugs.Monitor the scan tool for at least two minutes.Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time.Start the engine.Allow the engine to reach normal operating temperature.Test drive the vehicle.With the scan tool, select View DTCs.Is the status Active for this DTC?YesGo To 2 NoRefer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)2. (K202) GLOW PLUG MODULE CONTROL CIRCUIT SHORTED TO GROUND

Turn the ignition off.Disconnect the Glow Plug Module harness connector.Disconnect the Engine Control Module (ECM) harness connector.Measure the resistance between ground and the (K202) Glow Plug Module Control circuit in the Glow Plug Module harness connector.Is the resistance below 1000 ohms?YesRepair the (K202) Glow Plug Module Control circuit for a short to ground.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 33. (K202) GLOW PLUG MODULE CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K202) Glow Plug Module Control circuit between the Glow Plug Module harness connector and the Engine Control Module (ECM) harness connector.Is the resistance below 10.0 ohms?YesReplace the Glow Plug Control Module.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoRepair the (K202) Glow Plug Module Control circuit for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)