PRE-RELEASE
Fuel pump relay (102)
| Fuel pump relay (102) |
| Location |
Fuel pump relay (102)
| Main task |
The relay feeds the fuel pump and the oxygen sensor preheating.
| Type |
| Connection |
| Pin No. | Signal type | Description |
| 1 (86) | Control | Relay coil control lead. Supplied B+ from ECM pin 51(A). |
| 2 (85) | Ground | Relay coil grounding to grounding point G34S. |
| 3 (30) | +30 | Power supply to the relay contact from fuse 2 (727). |
| 5 (87) | Output, B+ | Relay switch's output. |
The fuel pump relay is controlled from pin 51(A), which supplies B+ when the relay pulls. When the ignition is switched "ON", the fuel pump relay pulls for 1 second. This builds up pressure before preinjection, which occurs when the crankshaft begins to rotate.
When the crankshaft then rotates, relay 7 is pulled until the ignition leaves the ON position or the crankshaft stops rotating.
