ECU information available
Actuator test: no OK
Measure parameters: yes
Oxygen sensor test: yes
Characterised by
- Short circuit to positive
- Short circuit to earth
- 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 short circuit to positive on terminal(s) 28 - 10 (computer) | verify: ECU connected, oxygen sensor disconnected, ignition on: - presence of U equal to approx. 0,4 V between terminals 10 and 28 on the control unit oxygen sensor connected, engine hot, engine running: - 0,1 V ≤ U ≤ 1 V (between terminals 28 and 10 on the control unit) |
Short circuit to earth
| conditions under which the fault appears | checks to be made conditions for checking |
|---|---|
| engine running after an operating time specified in calibration short circuit to earth on terminal(s) 28 - 10 (computer) | verify: ECU connected, oxygen sensor disconnected, ignition on: - presence of U equal to approx. 0,4 V between terminals 10 and 28 on the control unit oxygen sensor connected, engine hot, engine running: - 0,1 V ≤ U ≤ 1 V (between terminals 28 and 10 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 open circuit on terminal(s) 28 - 10 (computer) | verify: oxygen sensor connected, engine hot, engine running: - 0,1 V ≤ U ≤ 1 V (between terminals 28 and 10 on the control unit) |
Check(s) to be carried out if no fault found
ECU connected, oxygen sensor disconnected, ignition on, verify: U equal to approximately 0,4 V between terminals 3 and 4 of the 4V.NR connector
Oxygen sensor disconnected, ECU connected, engine running, verify: presence of 12 V between terminals 1 and 2 of connector 4 V.NR
Oxygen sensor disconnected, verify: 3 Ω ≤ R ≤ 8 Ω between terminals 2 and 1 of the oxygen sensor
Check the consistency of the signal perceived by the ECU (measure parameters)
+ P: permanent +