Civic Sedan L4-1493cc 1.5L SOHC (D15B2) TBI (1989)
Fig. 35 Main Relay Harness Test (pins 2 and 4)
Fig. 36 Main Relay Harness Jumper Test
8. Turn the ignition switch to the START position.
a. Approximately 10 volts should be available.
b. If there is no voltage check the #2 (10A) fuse and the wiring between the ignition switch and the fuse box, and from the fuse box to the main
relay.
9. Connect a jumper wire between the BLACK/YELLOW wire (pin 5) and the YELLOW/BLACK wire (pin 7).
10. Turn the ignition switch ON.
a. The fuel pump should work.
b. If the fuel pump does not work, check the wiring between the main relay and the fuel pump, and the wiring from the fuel pump to the ground
(BLACK wire).