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 conditions. Two Trip Fault.
| 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 ENGINE - SCHEMATICS AND DIAGRAMS) .