Infiniti I30 (A33). Manual — part 326

Wiring Diagram

NHEC0396

MEC935C

SEF639XB

GI

MA

EM

LC

FE

AT

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

FUEL PUMP

Wiring Diagram

EC-619

Diagnostic Procedure

NHEC0397

1

CHECK OVERALL FUNCTION

1. Turn ignition switch “ON”.
2. Pinch fuel feed hose with two fingers.

SEC013C

Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned “ON”.

OK or NG

OK

©

INSPECTION END

NG

©

GO TO 2.

2

CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT

1. Turn ignition switch “OFF”.
2. Disconnect fuel pump relay.

SEF284X

3. Turn ignition switch “ON”.
4. Check voltage between terminals 1, 5 and ground with CONSULT-II or tester.

SEF898X

OK or NG

OK

©

GO TO 4.

NG

©

GO TO 3.

FUEL PUMP

Diagnostic Procedure

EC-620

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

8

CHECK FUEL PUMP RELAY

With CONSULT-II

1. Reconnect fuel pump relay, fuel level sensor unit and fuel pump harness connector and ECM harness connector.
2. Turn ignition switch “ON”.
3. Turn fuel pump relay “ON” and “OFF” in “ACTIVE TEST” mode with CONSULT-II and check operating sound.

SEF073Y

Without CONSULT-II

Check continuity between terminals 3 and 5 under the following conditions.

SEF608X

OK or NG

OK

©

GO TO 9.

NG

©

Replace fuel pump relay.

9

CHECK FUEL PUMP

1. Disconnect fuel level sensor unit and fuel pump harness connector.
2. Check resistance between fuel level sensor unit and fuel pump terminals 1 and 3.

SEF609X

OK or NG

OK

©

GO TO 10.

NG

©

Replace fuel pump.

FUEL PUMP

Diagnostic Procedure (Cont’d)

EC-622