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3 DETECT MALFUNCTIONING PART
Check the following.
I Fuse block (J/B) connector B5
I 10A fuse
I 15A fuse
I Harness for open or short between fuse and fuel pump relay
© Repair harness or connectors.
4 CHECK FUEL PUMP POWER SUPPLY AND GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch “OFF”.
2. Disconnect fuel level sensor unit and fuel pump harness connector.
SEF263X
3. Check harness continuity between fuel pump terminal 3 and body ground, fuel pump terminal 1 and fuel pump relay
terminal 3. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OK © GO TO 6.
NG © GO TO 5.
5 DETECT MALFUNCTIONING PART
Check the following.
I Harness for open or short between fuel pump relay and fuel pump
I Harness for open or short between fuel pump and body ground
© Repair open circuit or short to ground or short to power in harness or connectors.
6 CHECK FUEL PUMP RELAY OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 28 and fuel pump relay terminal 2. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OK © GO TO 8.
NG © GO TO 7.
7 DETECT MALFUNCTIONING PART
Check the following.
I Harness connectors B3, M6
I Harness connectors M81, F49
I Harness for open or short between ECM and fuel pump relay
© Repair open circuit or short to ground or short to power in harness or connectors.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
FUEL PUMP
Diagnostic Procedure (Cont’d)
EC-621
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