ECU information available
Actuator test: no OK
Measure parameters: yes
Oxygen sensor test: yes
Characterised by
- Short circuit to positive
- Short circuit to earth or between wires
- Open circuit
Checks to be carried out if fault is present
Short circuit to positive
| conditions under which the fault appears | checks to be made conditions for checking |
|---|---|
| engine running after an operating time specified in calibration | engine running: check: presence of voltage U = 0,4 to 0,5 V between terminals 13 and 40 on the control unit engine running, after an operating time specified in calibration (engine overheating): - check the presence of U: 0,1 ≤ U ≤ 0,9 V between terminals 13 and 40 on the control unit |
Short circuit to earth or between wires
| conditions under which the fault appears | checks to be made conditions for checking |
|---|---|
| engine running after an operating time specified in calibration | ignition off; engine ECU, disconnected, upstream oxygen sensor disconnected: - check insulation of wire(s) A/B in relation to earth - engine running: upstream oxygen sensor connected check: presence of voltage U = 0,4 to 0,5 V between terminals 13 and 40 on the control unit engine running, after an operating time specified in calibration (engine overheating) - verify presence U: 0,1 ≤ U ≤ 0,9 V between terminals 13 and 40 on the control unit |
Open circuit
| conditions under which the fault appears | checks to be made conditions for checking |
|---|---|
| engine running: after an operating time specified in calibration | ignition off; engine ECU, disconnected, upstream oxygen sensor disconnected: - check continuity of wires A and B engine running: upstream oxygen sensor connected - check: presence of voltage U = 0,4 to 0,5 V between terminals 13 and 40 on the control unit engine running, after an operating time specified in calibration (engine overheating): - verify presence: U between 0,1 and 0,9 V, between terminals 13 and 40 on the control unit |
A all models
