F0:DATA LIST
| No. | Tech 1 Display | Conditions for checking | Nominal value | Trouble Codes | Terminal |
|---|---|---|---|---|---|
| 19 | FUEL PUMP RELAY | Ignition "ON" |
Wait a few seconds
Engine running at idle speed
INACTIVE 12V
| ACTIVE 0V | 53, 54 | 3, 24 |
Note:
Vehicles with ATWS systems can only be checked with the ATWS systems switched off.
| Troubleshooting | Nominal value | Cause of Fault |
· Ignition "OFF"
· Disconnect fuel injection unit relay K68
| Using multimeter, measure voltage at relay base Ter. 2 and Ter. 3 to ground. | 11.5 to 13.5 V | · Short circuit or lead interruption from |
- fuel injection unit relay K68 / Ter. 2 and / or Ter. 3 to Ter. 30
· Fuse F6 E defective
· Disconnect plug from Motronic control unit K61
· Using multimeter, check from relay base K68 / Ter. 1 to Motronic control unit K61 / Ter. 46 for passage
| approx. 0 W | · Short circuit or lead interruption from |
- fuel injection unit relay K68 / Ter. 1 to Motronic control unit K61 / Ter. 46
| - ATWS defective (if present) | ||
|---|---|---|
| · Using multimeter, check from relay base Ter. 9 to Motronic control unit K61 / Ter. 3 for passage | approx. 0 W | · Short circuit or lead interruption from |
- fuel injection unit relay K68 / Ter. 9 to Control unit K61 / Ter. 3
· Bridge fuel injection unit relay K68
Ter. 2 with Ter. 8
| · Using multimeter, measure voltage at control unit plug Ter. 37 to ground. | 11.5 to 13.5 V | · Short circuit or lead interruption from Motronic control unit K61 / Ter. 37 to |
- fuel injection unit relay K68 / Ter. 8
- injectors Y7 - 1 to Y7 - 4
- tank vent valve Y34
- hot film mass air flow meter P44 / Ter. 3
- exhaust gas recirculation valve Y18
| - air conditioning |
· Reconnect fuel injection unit relay K68 to relay socket
· Reconnect plug to Motronic control unit K61
· Check fuel pressure (observe safety regulations)
· Install pressure gauge in feed
| · Ignition "ON" | Feed pressure: 2.5 to 3.0 bar | · Fuse F55 defective |
· Short circuit or lead interruption from
- fuel injection unit relay K68 / Ter. 4 to fuse F55
- fuse F55 to oxygen sensor heating P32
- fuse F55 to fuel pump M21
| · Fuel tank empty |
· Using multimeter, check from Motronic control unit plug K61 / Ter. 24 to ground
| approx. 0 W | · Lead interruption from | |
|---|---|---|
| - Motronic control unit K61 / Ter. 24 to ground | ||
| If nominal values are attained: | · Fuel injection unit relay K68 defective |
· Fuel pump M21 defective
· Motronic control unit K61 defective