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• When Monitored: • Set Condition: Possible Causes (K21) IAT SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE (K21) IAT SIGNAL CIRCUIT OPEN (K900) SENSOR GROUND CIRCUIT OPEN IAT SENSOR PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. IAT SENSOR VOLTAGE ABOVE 4.98 VOLTS Ignition on, engine not running. With a scan tool, read the Intake Air Temperature Sensor voltage. Is the voltage above 4.98 volts? 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 Intake Air Temperature Sensor harness connector. Connect a jumper wire between the (K21) IAT Signal circuit and the Ignition on, engine not running. With a scan tool, read the IAT Sensor voltage. Is the voltage below 1.0 volt with the jumper wire installed? Yes >> Replace the IAT Sensor. Perform the POWERTRAIN VERIFICATION TEST. (Refer to No >> Go To 3 NOTE: Remove the jumper wire before continuing. 9 - 78 ENGINE ELECTRICAL DIAGNOSTICS KJ |