Fuel Pump Relay - 4-Cylinder Models

Fig 1: Bosch CIS-E ECU Multi-Pin Connector Use these terminal numbers during test procedures.

NOTE: No testing procedure is available for 5-cylinder models.

Remove fuel pump relay from relay board. Turn ignition on. Using multimeter, measure voltage at following relay board sockets: between terminal 2 and ground, between terminals 2 and 1 and between terminals 4 and 1. Reading should be battery voltage or slightly less.
If reading is low or 0, check wiring. Refer to appropriate WIRING DIAGRAM in this article to check circuits. Measure voltage between relay board sockets 5 and 1. Battery voltage should be present. If reading is correct, ground middle wire of ignition distributor connector lightly.
Voltage reading should drop for short time. If reading does drop, replace , between terminals 2 and 1 and between terminals 4 and 1. Reading should be battery voltage or slightly less.
If reading is low or 0, check wiring. Refer to appropriate WIRING DIAGRAM in this article to check circuits. Measure voltage between relay board sockets 5 and 1. Battery voltage should be present. If reading is correct, ground middle wire of ignition distributor connector lightly.
Voltage reading should drop for short time. If reading does drop, replace fuel pump relay and check Hall sender. If reading does not drop, check Hall ignition ECU.