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• When Monitored: • Set Condition: Possible Causes EXHAUST LEAK ENGINE MECHANICAL PROBLEM 1/2 O2 SENSOR (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT (K299) O2 1/2 HEATER CONTROL CIRCUIT (K904) O2 DOWNSTREAM RETURN CIRCUIT FUEL CONTAMINATION Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC NOTE: Check the vehicle repair history. If the 1/2 O2 has been replace make sure that the O2 sensor was NOTE: Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved sil- 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. EXHAUST LEAK Turn the ignition off. WARNING: To avoid personal injury from the exhaust system being hot, allow the exhaust to cool down to Is the exhaust system is good condition? Yes >> Go To 3 No >> Repair or Replace as necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 530 ENGINE ELECTRICAL DIAGNOSTICS KJ |