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OBD-II DRIVE CYCLE PATTERN Refer to Diagnostic Function - OBD-II Drive Cycle - TROUBLESHOOTING HINTS (The most likely ⦆ Left bank heated oxygen sensor (front) heater. ⦆ Connector damage. ⦆ Harness damage ⦆ ECM failed.
DIAGNOSIS Required Special Tools: ⦆ MD998464: Test Harness STEP 1. Check harness connector B-14 at the left bank Q:Is the harness connector in good condition? YES: Go to Step 2. NO: Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection P.00E-2. Then go to Step 6. STEP 2. Check the left bank heated oxygen sensor (front). ZK603154 Heated MD998464 Red Blue AA00 (1) Disconnect left bank heated oxygen sensor (front) connector (2) Measure the resistance between heated oxygen sensor Standard value: 4.5 - 8.0 Ω [at 20°C (68°F)] Q:Is the measured resistance between 4.5 and 8.0 ohms [at 20°C (68°F)]? YES: Go to Step 3. NO: Replace the left bank heated oxygen sensor (front). Then go to Step 6. STEP 3. Measure the power supply voltage at left bank (1) Disconnect the connector B-14 and measure at the harness (2) Turn the ignition switch to the "ON" position. B-14 harness 1 2 3 4 ZK603162AA00 (3) Measure the voltage between terminal No. 1 and ground. ⦆ Voltage should be battery positive voltage. (4) Turn the ignition switch to the "LOCK" (OFF) position. Q:Is battery positive voltage (approximately 12 volts) present? YES: Go to Step 4. NO: Repair harness wire between the MFI relay connector A-33X (terminal No. 2) and the left bank heated oxygen MULTIPORT INJECTION SYSTEM (MFI) <DIAGNOSIS> 13Ab-87 DIAGNOSTIC TROUBLE CODE PROCEDURES |