PCM sets DTC P0137 if the HO2S(B1S2) voltage remains excessively low for a pre-determined time.
Item | Detecting Condition | Possible Cause |
DTC Strategy |
•
Electrical Monitoring | 1. Poor Connector Connection 2. Short to Ground in Downstream O2 Sensor Signal Circuit 3. Defected Downstream O2 Sensor |
Enable Conditions |
•
Lambda closed loop control active
•
Lambda controller not at max. limit
•
Catalyst purge after fuel cut off not active
•
Battery voltage higher than 10 V and lower than 16 V
•
No relevant DTC present | |
Threshold Value |
•
Downstream O2 Sensor Voltage lower than 0.02V and Downstream O2 Sensor Element resistance less than 15 Ω | |
Diagnostic Time |
•
35 sec. | |
Mil On Condition |
•
2 Driving Cycle |
