PCM/ECM sets DTC P0137 if the HO2S(B1S2) voltage remains excessively low for a predetermined time.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Voltage range check(short circuit to ground) | 1. Short to ground in signal harness 2. Poor connection or damaged harness 3. Faulty Heated O2 Sensor (HO2S) |
Enable Conditions |
•
Lambda close loop control active
•
Lambda controller not at max. limit
•
Catalyst purge after fuel cut-off not active
•
No relevant failure
•
10V< Battery voltage <16V | |
Threshold Value |
•
HO2S(B1S2) < 0.02V & Internal resistance < 15Ω | |
Diagnostic Time |
•
35 sec. | |
Mil On Condition |
•
2 Drive Cycles |
