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(P0135) O2 SENSOR 1/1 HEATER PERFORMANCE (CONTINUED) When Monitored and Set Condition • When Monitored: Engine Running and Heater duty cycle greater than 0%. • Set Condition: O2 Heater Temperature does not reach 575°C (959°F) within 90 seconds during monitoring POSSIBLE CAUSES FUSED ENGINE CONTROL RELAY OUTPUT CIRCUIT OPEN O2 SENSOR HEATER CONTROL CIRCUIT SHORT TO VOLTAGE O2 SENSOR HEATER CONTROL CIRCUIT SHORT TO GROUND O2 HEATER CONTROL CIRCUIT OPEN O2 HEATER ELEMENT POWERTRAIN CONTROL MODULE For a complete Powertrain Control Module Circuit Diagram, (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). 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 2. CHECK FOR CURRENT DTC Note: If the PCM detects and stores a DTC, the PCM also stores T at the same time the DTC is displayed. Note: Before erasing stored DTCs, record these conditions. With the DRB III T , erase PCM DTCs. Note: It maybe necessary to road test the vehicle for this DTC to set. T , read PCM DTCs. Did this DTC set again? Yes >> Go To 3 No >> Go To 8 ZH ENGINE - ELECTRICAL DIAGNOSTICS 9 - 149 |