Ignition on.
Display: 0 V
5 Check wiring from DME control module, pin IV/10, to fuel pump relay for continuity.
1. Connect special tool 9637 to wiring harness (DME control module connector).
2. Remove fuel pump relay.
3. Connect ohmmeter to special tool 9637, pin IV/10, and fuel pump relay slot, pin 6 (terminal 85).
Display: 0 - 5 ohms
If infinity ohms is displayed, check connector X 2/3, pin 23, and check wiring harness for chafing and pinching damage.
Oxygen Sensing Adaptation, Upper Load Range, Bank 1 - Above Limit
P1125
357 Oxygen Sensing Adaptation, Upper Load Range, Bank 1 - Above Limit
Diagnosis conditions
- Oxygen sensing system active
- Time elapsed after engine start-up: 250 to 350 seconds (USA)
- Time elapsed after engine start-up: 302 to 402 seconds (RoW)
- Engine temperature greater than 60 锟斤拷C
- Mass air flow greater than 180 kg/h
Possible fault cause
- Incorrect signal from MAF sensor
- Intake air system leaking
- Fuel pressure too low
- Volume supply of fuel pump too low
- Fuel injectors fouled
Diagnosis/troubleshooting
NOTE:
- Air leaks ahead of the oxygen sensors can lead to a fault in adaptation See Check exhaust system for leaks.
- For vehicles in the USA, the upper load range will probably not be reached. The only case in which a fault could be stored is during driving
while towing a trailer or caravan on a hill.
- If the fuel tank reserve light is switched on, no fault is entered.
Oxygen Sensing Adaptation, Upper Load Range, Bank 1 - Below Limit
P1125
357 Oxygen Sensing Adaptation, Upper Load Range, Bank 1 - Below Limit
Diagnosis conditions
- Oxygen sensing system active