___
| | | F.PUMP Ignition
| S | Fuse __|_
|_|_| 10 amp | | |ECM
| | / |
| |__|_|
_|______________ |
_|__ __|_|_
| | |Oil | | | |Fuel
| / |Pressure | / 3 |Pump
|__|_|Switch |__|_|_|Relay
|_______________| |
| | _|_
ALDL = pin G | v GND
|
C502 = pin C
_|_
| |Fuel
|(M)|Pump
|___|
|
C502 = pin A
_|_
v GND
C502 is the 3-pin fuel pump connector on the firewall in front of the engine.
Pin G of the ALDL connector is the fuel pump test pin. If this pin receives voltage but the fuel pump does not run, then the pump is bad. If the pin does not receive voltage, then the problem lies somewhere before the pump. (fuel pump relay, oil pressure switch, wiring, etc)
From: Sketch
