EN(H4SO)(diag)-71
ENGINE (DIAGNOSTICS)
Diagnostics for Engine Starting Failure
6 CHECK FUEL PUMP RELAY.
1)Disconnect the connectors from fuel pump
relay and main relay.
2)Remove the fuel pump relay and main relay
with bracket.
3)Connect the battery to fuel pump relay con-
nector terminals No. 1 and No. 3.
4)Measure the resistance between connector
terminals of fuel pump relay.
Terminals
No. 2 — No. 4:
Is the resistance less than 10
Ω?
Go to step 7. Replace the fuel
pump relay. <Ref.
to FU(H4SO)-49,
Fuel Pump
Relay.>
7 CHECK HARNESS BETWEEN ECM AND
FUEL PUMP RELAY CONNECTOR.
1)Disconnect the connectors from ECM.
2)Measure the resistance of harness between
ECM and fuel pump relay connector.
Connector & terminal
(B136) No. 10 — (B46) No. 3:
Is the resistance less than 1
Ω?
Go to step 8. Repair open circuit
in harness
between ECM and
fuel pump relay
connector.
8 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM
connector?
Repair poor con-
tact in ECM con-
nector.
Check fuel injec-
tor circuit. <Ref. to
EN(H4SO)(diag)-
72, FUEL INJEC-
TOR CIRCUIT,
Diagnostics for
Engine Starting
Failure.>
Step Check Yes No
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