1. Double relay
2. ECM
3. Fuel pump
4. “FUEL PUMP” fuse (15 A)
5. Double relay fuse (30 A)
6. To radiator fan relay No.3
ENGINE DIAGNOSIS (RHZ ENGINE WITH TRIPLE-CONNECTOR ECM) 6-1-57
TABLE B-1 FUEL PUMP CIRCUIT INSPECTION
WIRING DIAGRAM
INSPECTION
STEP ACTION YES NO
1 Fuel Pump Operation Check:
1) Turn ON ignition switch.
Is fuel pump operation sound heard for 5 sec. after
ignition switch ON?
Fuel pump circuit is
in good condition.
Go to Step 2.
2 Fuel Pump Circuit Check:
1) With ignition switch OFF, remove double relay from
connector.
2) Check for proper connection to relay at each terminal.
3) If OK, using service wire, connect terminals 8 and 5 of
relay connector.
CAUTION: Check to make sure that connec-
tion is made between correct terminals.
Wrong connection can cause damage to
ECM, wire harness etc.
Is fuel pump heard to operate at ignition switch ON?
Go to Step 3. “BLK”, “PNK/BLK”
or “BRN/RED”
circuit open or fuel
pump malfunction.
3 Double Relay Check:
1) Check fuel pump relay referring to “Double Relay
Inspection” in Section 6E3.
Is it in good condition?
“GRN/ORN” circuit
open.
Replace fuel pump.
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