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Theory of Operation Intake Air Temperature Sensor performance looks at the outputs of three temperature sensors and compare them • When Monitored: • Set Condition: Possible Causes (K21) IAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE (K21) IAT SIGNAL CIRCUIT OPEN (K900) SENSOR GROUND CIRCUIT OPEN (K21) IAT SIGNAL CIRCUIT SHORTED TO GROUND (K21) IAT SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND CIRCUIT INTAKE AIR 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 DTCs. 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. (K21) IAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE Turn the ignition off. Disconnect the C2 PCM harness connector. Disconnect the IAT Sensor harness connector. NOTE: Visually inspect both the component and the PCM connec- 9 - 70 ENGINE ELECTRICAL DIAGNOSTICS KJ |