If λ sensor heater control circuit is open or short to ground for 5 sec. under rear λ sensor heater control condition, ECM sets DTC P003700. This fault is caused by open or short to ground in heater control circuit of rear λ sensor or defected lambda sensor unit.
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
Open or short to ground in lambda sensor unit heater powerstage | 1. Open or short to ground in rear lambda sensor unit heater circuit 2. Faulty rear lambda sensor unit | |
Enable Condition |
•
Engine running | ||
Threshold Value |
•
Open or short to ground in rear lambda sensor unit heater circuit | ||
Detecting Time |
•
5 sec. | ||
Fail Safe | Engine OFF |
•
No | |
EGR Off |
•
No | ||
Torque Limit |
•
No | ||
MIL |
•
On | ||
