SAAB WIS ONLINE

P1137

Read the instructions below then start the fault diagnostic procedure.

Symptom: CHECK ENGINE.

P1137


O2S Circuit. Low Voltage. Sensor 2.


Fault symptoms


• CHECK ENGINE.


On-Board Diagnostics

Type of diagnosis:


- Continuous. But interrupted when fault criteria fulfilled and will not restart until next driving cycle.


Enable criteria:


- Engine load over 150 mg/c. Coolant temperature more than 60°C. Preheating active longer than 4s. Preheating current exceeds 300 mA. Closed loop active longer than 5s. Closed loop between 20 and -20%. No fuel shut-off.


Fault criteria:


- O2S2 voltage is between 0.05 and 0.3V for longer than 90s.


Dependents:


- P0137, P0138, 0140.


System reaction to a fault:


- Transition adaptation of closed loop is blocked.


OK report:


- Enable criteria fulfilled and 120s has expired without a fault report.


Fault handling: (See section Fault handling III, other emission-related components and functions for more information.)


- Type III.


Diagnostic help

Fault diagnosis concerns an electrical fault in connecting leads or in the sensor.

Functions in the diagnostic tool related to the fault:


• Diagnostic status for the diagnosis.

• Oxygen Sensor Value, unit V.


See also Menu "Read Values" for more information.

Note

Oxygen sensor receives reference oxygen from the surrounding air via the connecting cables. For this reason, electrical contact spray or grease must not be used on the oxygen sensor connector.


Checking the wiring

Jiggle the wiring harness at several points and in different directions to detect intermittent breaks and short circuits. Observe the multimeter, diagnostic tool or test lamp during the check.