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• When Monitored: • Set Condition: Possible Causes (K21) IAT SENSOR SIGNAL SHORTED TO GROUND (K21) IAT SENSOR SIGNAL SHORTED TO (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. IAT SENSOR VOLTAGE BELOW 0.078 OF A VOLT Ignition on, engine not running. With a scan tool, read the IAT voltage. Is the voltage below 0.078 of a volt? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. IAT SENSOR Turn the ignition off. Disconnect the IAT Sensor harness connector. Ignition on, engine not running. With a scan tool, read IAT voltage. Is the voltage above 4.5 of a volts? Yes >> Replace the Intake Air Temperature Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 3 9 - 68 ENGINE ELECTRICAL DIAGNOSTICS LX |