ECU information available
Actuator test: no OK
Measure parameters: no OK
Characterised by
- Short circuit to positive or open circuit
- Short circuit to earth
- No signal or consistency
Checks to be carried out if fault is present
Short circuit to positive or open circuit
| conditions under which the fault appears | checks to be made conditions for checking |
|---|---|
| engine running at idle, vehicle driving at different engine speeds, steady speeds, short circuit to positive on terminal(s) 72 (88 V.NR), open circuit on terminal(s) 72 (88 V.NR) | if a vehicle speed fault is present, deal with the fault ignition on, control unit 1320 disconnected, body accelerometer sensor 1222, connected: - check, no voltage on terminal(s) 72 ignition on, ECU 1320 connected, body accelerometer sensor disconnected: - check, 5 V present at terminals 1 and 2 of connector 3 V.NR (1222) |
Short circuit to earth
| conditions under which the fault appears | checks to be made conditions for checking |
|---|---|
| engine running at idle, vehicle driving at different engine speeds, steady speeds, short circuit to earth, short circuit to earth on terminal(s) 72 (88 V.NR) computer 1320 | ignition off, engine ECU disconnected body accelerometer sensor 1222 connected - check: no earth at terminal(s) 72 on the 88 V.NR connector ignition on, ECU 1320 connected, body accelerometer sensor disconnected: - check, 5 V present at terminals 1 and 2 of connector 3 V.NR (1222) |
No signal or consistency
| conditions under which the fault appears | checks to be made conditions for checking |
|---|---|
| engine running at idle, vehicle driving at different engine speeds, steady speeds | if a vehicle speed fault is present, deal with the fault verify: - accelerometer to bracket mounting - bracket to body mounting unscrew: - accelerometer, tap (using a metal tool) the accelerometer bracket check the variation in the signal perceived by the ECU 1320: - (oscillation) - voltage measured between terminals 72 and 37 of the engine control unit equal to 2.5 V - test with a new sensor 1222, if the original fault is still present, replace the ECU 1320 |
A all models
