1A-241 Engine General Information and Diagnosis:
Troubleshooting
NOTE
• Before performed troubleshooting, be sure to read the “Precautions of ECM Circuit Inspection: ”.
• When measuring circuit voltage, resistance and/or pulse signal at ECM connector, connect the
special tool to ECM and/or the ECM connectors referring to “Inspection of ECM and Its Circuits: ”.
Step
Action
Yes
No
1
Fuel pump control system check for operation
Is fuel pump heard to operate 2 sec. after ignition switch is
turned ON?
Fuel pump circuit is in
good condition.
Go to Step 2.
2
Fuel pump relay power supply check
1) Disconnect fuel pump relay from fuse box No.2 with
ignition switch turned OFF.
2) Check for proper connection to fuel pump relay at each
terminal.
3) If OK, turn ON ignition switch, measure voltage between
“BLK/WHT” wire terminal of fuel pump relay connector
and engine ground.
Is voltage 10 – 14 V?
Go to Step 3.
“BLK/WHT” wire is open
or shorted to ground
circuit.
3
Fuel pump relay power supply check
1) Turn ON ignition switch, measure voltage between “BLU/
BLK” wire terminal of fuel pump relay connector and
engine ground.
Is voltage 10 – 14 V?
Go to Step 4.
“BLU/BLK” wire is open
circuit.
4
Fuel pump relay check
1) Check fuel pump relay referring to “Control Relay
Inspection: in Section 1C”.
Is relay in good condition?
Go to Step 5.
Faulty relay.
5
Fuel pump relay drive signal check
1) Connect fuel pump relay to fuse box No.2.
2) Connect voltmeter between “E23-15” terminal of ECM
connector and vehicle body ground.
3) Measure voltage 2 second after ignition switch is turned
ON.
Is voltage 10 – 14 V?
Go to Step 6.
“WHT/GRN” wire is
open circuit or shorted
to ground circuit.
I2RH01110132-01
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