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P1115-GENERAL TEMPERATURE RATIONALITY (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. Theory of Operation The General Temperature Rationality looks at the outputs of the three temperature sensors and compare them • When Monitored: • Set Condition: Possible Causes EXCESSIVE RESISTANCE IN THE SENSOR SIGNAL CIRCUIT EXCESSIVE RESISTANCE IN THE (K900) SENSOR GROUND CIRCUIT TEMPERATURE SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC Ignition on, engine not running. With a scan tool, read the DTCs. NOTE: All ECT, Intake Air, and Ambient Air Temperature Sensor codes must be diagnosed and repaired NOTE: In cold weather, this DTC could be set by a high powered block heater and no repair would be Is the DTC active at this time? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. TEMPERATURE SENSOR CIRCUIT With a scan tool, read the ECT, Ambient Air Temp, and Intake Air Temp Sensor temp values. Start the engine. Allow the engine to reach normal operating temperature while monitoring the three Sensor temperature values. Is the temperature for each of the Sensors increasing properly? Yes >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 3 9 - 742 ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L DR/DH |