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(P0155) O2 SENSOR 2/1 HEATER CIRCUIT LOW (CONTINUED) When Monitored and Set Condition • When Monitored: Engine Running and Heater duty cycle greater than 0% • Set Condition: The PCM detects the O2 Heater voltage is out of acceptable range. Below 0.0926 volt. POSSIBLE CAUSES O2 HEATER CONTROL SHORT TO GROUND O2 HEATER ELEMENT POWERTRAIN CONTROL MODULE 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 (P0135) O2 SENSOR 1/1 HEATER CIRCUIT LOW. 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 - 205 |