Note. Bank No. 1 refers to bank that includes cylinder No. 1. Bank No. 2 refers to bank without cylinder No. 1. Sensor No. 1 refers to sensor closest to engine block.
| CAUTION | If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. |
Circuit Description
The oxygen sensor monitors exhaust gas oxygen content and delivers an input signal to ECM. The ECM uses this input signal to determine fuel injection system operation. Sensors include heater. DTC P1135 and P1155 are set when, ECM detects that heater circuit current is more than 8 amps. DTC P1135 and P1155 are also set when, ECM detects that heater circuit current is .25 amps or less. Possible causes are
- Open Or Short In Oxygen Sensor Heater Circuit
- Oxygen Sensor Heater
- ECM