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(P0137) O2 SENSOR 2/2 ABOVE 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 lean to rich within 20 seconds during POSSIBLE CAUSES EXHAUST LEAK O2 SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE O2 SENSOR SIGNAL CIRCUIT SHORT TO GROUND O2 SENSOR SIGNAL CIRCUIT OPEN O2 SENSOR GROUND CIRCUIT SHORT TO VOLTAGE O2 SENSOR GROUND CIRCUIT SHORT TO GROUND O2 SENSOR GROUND CIRCUIT OPEN O2 SENSOR For a complete Powertrain Control Module Circuit Diagram, (Refer to 9 - ENGINE - SCHEMATICS AND DIA- Diagnostic Test 1. PRE-DIAGNOSTIC CHECK OUT Note: Always perform diagnostics with a fully charged battery. Note: Check connectors — Clean/repair as necessary. Poor pin to Note: Check for applicable TSBs related to the problem. With the DRB III T , read PCM DTCs. Using the wiring diagram/schematic as a guide, inspect the wiring and Perform this procedure prior to symptom diagnosis. Continue Go To 2 ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 165 |