For a complete wiring diagram Refer to Section 8WWhen Monitored:With the ignition on.Set Condition:The Post-Catalyst Exhaust Temperature Sensor Signal is above 1000°C.Possible CausesINTERMITTENT DTC(K353) POST-CATALYST EXHAUST TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE(K915) POST-CATALYST EXHAUST TEMPERATURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE(K353) POST-CATALYST EXHAUST TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE(K915) POST-CATALYST EXHAUST TEMPERATURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCEPOST-CATALYST EXHAUST TEMPERATURE SENSORENGINE CONTROL MODULE (ECM)Always 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).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.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. (K353) POST-CATALYST EXHAUST TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

Turn the ignition off.Disconnect the Post-Catalyst Exhaust Temperature Sensor harness connector.Disconnect the Engine Control Module (ECM) harness connector.Remove the ASD Relay from the TIPM.Connect a jumper wire between cavity 30 and cavity 87 of the ASD Relay Connector.Turn the ignition on.Measure the voltage of the (K353) Post-Catalyst Exhaust Temperature Sensor Signal circuit in the Post-Catalyst Exhaust Temperature Sensor harness connector.Is there any voltage present?YesRepair the (K353) Post-Catalyst Exhaust Temperature Sensor Signal circuit for a short to voltage.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 33. (K915) POST-CATALYST EXHAUST TEMPERATURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE

Measure the voltage of the (K915) Post-Catalyst Exhaust Temperature Sensor Ground circuit in the Post-Catalyst Exhaust Temperature Sensor harness connector.Is there any voltage present?YesRepair the (K915) Post-Catalyst Exhaust Temperature Sensor Ground circuit for a short to voltage.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 44. (K353) POST-CATALYST EXHAUST TEMPERATURE SENSOR SIGNAL OPEN OR HIGH RESISTANCE

Turn the ignition off.Measure the resistance of the (K353) Post-Catalyst Exhaust Temperature Sensor Signal circuit between the Post-Catalyst Exhaust Temperature Sensor harness connector and the Engine Control Module (ECM) harness connector.Is the resistance below 10.0 ohms?YesGo to 5NoRepair the (K353) Post-Catalyst Exhaust Temperature Sensor Signal circuit for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)5. (K915) POST-CATALYST EXHAUST TEMPERATURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Measure the resistance of the (K915) Post-Catalyst Exhaust Temperature Sensor Ground circuit between the Post-Catalyst Exhaust Temperature Sensor harness connector and the Engine Control Module (ECM) harness connector.Is the resistance below 10.0 ohms?YesGo to 6NoRepair the (K915) Post-Catalyst Exhaust Temperature Sensor Ground circuit for an open circuit or high resistance.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)6. POST-CATALYST EXHAUST TEMPERATURE SENSOR

Turn the ignition off.Connect the Engine Control Module (ECM) harness connector.Remove the jumper wire from between cavity 30 and cavity 87 of the ASD Relay Connector.Install the ASD Relay.Connect a jumper wire between the (K353) Post-Catalyst Exhaust Temperature Sensor Signal circuit and the (K915) Post-Catalyst Exhaust Temperature Sensor Ground circuit in the Post-Catalyst Exhaust Temperature Sensor harness connector.Turn the ignition on.With the scan tool, Clear DTCs.With the scan tool, select View DTCs.The scan tool should display a Post-Catalyst Exhaust Temperature Sensor low voltage or short to ground DTC with the jumper wire in place.Does the scan tool display the DTC as described above?YesReplace the Post-Catalyst Exhaust Temperature Sensor in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo to 77. ENGINE CONTROL MODULE (ECM)Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Post-Catalyst Exhaust Temperature Sensor and the Engine Control Module (ECM).Look for any chafed, pierced, pinched, or partially broken wires.Look for broken, bent, pushed out or corroded terminals.Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.Look for the data to change or for the DTC to reset during the wiggle test.Refer to any Technical Service Bulletins that may apply.Were any problems found?YesRepair as necessary.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoReplace the Engine Control Module (ECM) in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)