Nissan Frontier D22. Manual - part 656

FUEL PUMP CIRCUIT

EC-1727

[VG33ER]

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Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than the ECM terminals, such as the ground. 

Diagnostic Procedure

UBS00E2X

1. 

CHECK OVERALL FUNCTION

1.

Turn ignition switch ON.

2.

Pinch fuel feed hose with fingers.
Fuel pressure pulsation should be felt on the fuel feed hose
for 5 seconds 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.

3.

Turn ignition switch ON.

4.

Check voltage between terminals 2, 5 and ground with CON-
SULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

11

W/R

Fuel pump relay

[Ignition switch: ON]

●

For a few seconds after turning ignition switch ON

[Engine is running]

0 - 1V

[Ignition switch: ON]

●

A few seconds after turning ignition switch ON

BATTERY VOLTAGE
(11 - 14V)

BBIA0422E

SEF349V

Voltage: Battery voltage

SEF674W

EC-1728

[VG33ER]

FUEL PUMP CIRCUIT

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Fuse block (J/B) connector M31

●

15A fuse

●

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 pump harness connector.

3.

Check harness continuity between fuel pump terminal 2 and
body ground, fuel pump terminal 1 and fuel pump relay terminal
3. Refer to Wiring Diagram.

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.

●

Harness connectors M67, C1

●

Harness for open or short between fuel pump and body ground

●

Harness for open or short between fuel pump and fuel pump relay

>> 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 11 and fuel pump relay terminal 1. Refer to Wiring Dia-
gram.

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.

●

Harness connectors M81, F36

●

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.

Continuity should exist.

LEC764

Continuity should exist.

FUEL PUMP CIRCUIT

EC-1729

[VG33ER]

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8. 

CHECK FUEL PUMP RELAY

 With CONSULT-II

1.

Reconnect fuel pump relay, 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.

 Without CONSULT-II

Check continuity between terminals 3 and 5.

OK or NG

OK

>> GO TO 9.

NG

>> Replace fuel pump relay.

9. 

CHECK FUEL PUMP

1.

Disconnect fuel pump harness connector.

2.

Check resistance between terminals 1 and 2.

OK or NG

OK

>> GO TO 10.

NG

>> Replace fuel pump.

10. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Removal and Installation

UBS00E2Y

FUEL PUMP

Refer to 

FL-6, "FUEL LEVEL SENSOR UNIT AND FUEL PUMP ASSEMBLY"

 .

SEF073Y

Condition

Continuity

12V direct current supply between terminals 1 and 2

Yes

No current supply

No

SEF511P

Resistance: 0.2 - 5.0

Ω [at 25°C (77°F)]

SEC316C

EC-1730

[VG33ER]

POWER STEERING OIL PRESSURE SWITCH

POWER STEERING OIL PRESSURE SWITCH

PFP:49761

Component Description

UBS00E2Z

The power steering oil pressure switch is attached to the power
steering high-pressure tube and detects a power steering load.
When a power steering load is detected, it signals the ECM. The
ECM adjusts the IACV-AAC valve to increase the idle speed and
adjust for the increased load.

CONSULT-II Reference Value in Data Monitor Mode

UBS00E30

Specification data are reference values.

LEC521

MONITOR ITEM

CONDITION

SPECIFICATION

PW/ST SIGNAL

●

Engine: After warming up, idle the 
engine

Steering wheel in neutral position
(forward direction)

OFF

The steering wheel is turned.

ON