Fault Conditions

P1135

O2S Heater Circuit. Current too Low, Sensor 1.







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:
- Test 1: Engine running. Main relay voltage exceeding 10 V. Pre-heating not active.
- Test 2: Engine running. Main relay voltage exceeding 10 V. Pre-heating active.

Fault criteria:
- Test 1: Output voltage below 2 V for more than 5 s.
- Test 2: Current below 300 mA for more than 5 s.

Dependents:
- P1641, P1654 and P1655.

System reaction to a fault:
- Closed loop is blocked.

OK report:
- Enable criteria fulfilled. Fault criteria for P0135 or P0136 not fulfilled within 60 s

Fault handling: (For more information, Fault Handling III, Other Emission-Related Components and Function)

- 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.
- Activate output for pre-heating.
- Oxygen sensor pre-heating current, unit mA.

For more information, refer to scan tool testing. Menu Read Values

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.

Proceed to Diagnostic Procedures Checking the Sensor Preheating Power Supply