If λ sensor heater control circuit is open or short to ground for 5 sec. under downstream λ sensor heater control condition, ECM sets DTC P003700. This fault is caused by open or short to ground in heater control circuit of downstream λ sensor or defected lambda sensor.
Item | Detecting Condition | Possible Cause | |
DTC Strategy |
•
Open or short to ground in lambda sensor heater powerstage | 1. Open or short to ground in downstream lambda sensor heater circuit 2. Faulty downstream lambda sensor | |
Enable Condition |
•
Engine running | ||
Threshold Value |
•
Open or short to ground in downstream lambda sensor heater circuit | ||
Detecting Time |
•
5 sec. | ||
Fail Safe | MIL |
•
On | |
