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(P0137) O2 SENSOR 2/2 BELOW THRESHOLD (CONTINUED) When Monitored and Set Condition • When Monitored: Start and drive vehicle greater than 32 km/h (20 MPH) and less than 89 km/h (55 MPH). • Set Condition: The O2 sensor voltage switches only 11 times or less from rich to lean within 20 seconds during POSSIBLE CAUSES EXHAUST LEAK O2 SENSOR SIGNAL CIRCUIT O2 SENSOR GROUND CIRCUIT O2 SENSOR For a complete Powertrain Control Module Circuit Diagram, (Refer to 9 - ENGINE - SCHEMATICS AND DIA- Diagnostic Test 1. CHECK FOR CURRENT DTC Turn the ignition on. With the DRB III T , read PCM DTCs. Is this DTC present? Yes >> For complete diagnosis of this DTC, refer to (P0137) O2 SENSOR 2/2 ABOVE THRESHOLD. No >> Go To 2 2. INTERMITTENT WIRING AND CONNECTORS The conditions necessary to set this DTC are not present at this time. Note: Check connectors — Clean/repair as necessary. Poor pin to terminal connections can set DTCs. Using Note: Check for any Technical Service Bulletins that may apply. Were there any problems found? Yes >> Repair as necessary. Perform POWERTRAIN VERIFICATION TEST - VER 2. No >> The condition that caused this DTC to set is currently not present. Inspect the related wiring harness for a possible intermittent condition. ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 169 |