Nissan Frontier. Manual — part 695

FUEL PUMP

EC-1351

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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4. Check voltage between ECM terminal 113 and ground with

CONSULT or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

3.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

Check voltage between IPDM E/R terminal 46 and ground with

CONSULT or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 12.

4.

DETECT MALFUNCTIONING PART

Check harness for open or short between IPDM E/R and ECM

>> Repair harness or connectors.

5.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-III

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Disconnect “fuel level sensor unit and fuel pump” harness con-

nector.

4. Turn ignition switch ON.

5. Check voltage between “fuel level sensor unit and fuel pump”

terminal 1 and ground with CONSULT or tester.

6. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 9.

NG

>> GO TO 6.

6.

CHECK 15A FUSE

1. Turn ignition switch OFF.

Voltage: Battery voltage

PBIB1187E

Voltage: Battery voltage

PBIB2656E

BBIA0545E

Voltage:

Battery voltage should exist for 1 sec-
ond after ignition switch is turned ON.

PBIB0795E

EC-1352

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

FUEL PUMP

2. Disconnect 15A fuse.

3. Check 15 A fuse (No.48).
OK or NG

OK

>> GO TO 7.

NG

>> Replace 15A fuse.

7.

CHECK FUEL PUMP POWER SUPPLY CURCUIT-IV

1. Disconnect IPDM E/R harness connector E119.

2. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 1 and IPDM E/R termi-

nal 13.

Refer to Wiring Diagram.

3. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 12.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors C1, E41

• Harness for open or short between “fuel level sensor unit and fuel pump” and IPDM E/R

>> Repair open circuit or short to ground or short to power in harness or connectors.

9.

CHECK FUEL PUMP GROUND CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between “fuel level sensor unit and fuel pump” terminal 3 and ground.

Refer to Wiring Diagram.

2. Also check harness for short to ground.
OK or NG

OK

>> GO TO 11.

NG

>> GO TO 10.

10.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors C1, E41

• Harness for open or short between “fuel level sensor unit and fuel pump” and ground

>> Repair open circuit or short to power in harness or connectors.

11.

CHECK FUEL PUMP

Refer to

EC-1353, "Component Inspection"

.

OK or NG

OK

>> GO TO 12.

NG

>> Replace fuel pump. Refer to

FL-10, "Removal and Installation"

.

12.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

.

OK or NG

OK

>> Replace IPDM E/R. Refer to

PCS-28, "Removal and Installation of IPDM E/R"

.

NG

>> Repair or replace harness or connectors.

Continuity should exist.

Continuity should exist.

FUEL PUMP

EC-1353

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

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Component Inspection

INFOID:0000000009482036

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.

Resistance: Approximately 0.2 - 5.0

Ω [at 25°C (77°F)]

SEC918C

EC-1354

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR MEXICO]

IGNITION SIGNAL

IGNITION SIGNAL

Component Description

INFOID:0000000009482037

IGNITION COIL & POWER TRANSISTOR

The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns

ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil

secondary circuit.

Diagnosis Procedure

INFOID:0000000009482038

1.

CHECK ENGINE START

Turn ignition switch OFF, and restart engine.

Is engine running?
Yes or No

Yes (With CONSULT)>>GO TO 2.

Yes (Without CONSULT)>>GO TO 3.

No

>> GO TO 4.

2.

CHECK OVERALL FUNCTION

With CONSULT

1. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.

2. Make sure that each circuit produces a momentary engine speed drop.
OK or NG

OK

>> INSPECTION END

NG

>> GO TO 10.

3.

CHECK OVERALL FUNCTION

Without CONSULT

1. Let engine idle.

2. Read the voltage signal between ECM terminals 60, 61, 62, 79,

80, 81 and ground with an oscilloscope.

3. Verify that the oscilloscope screen shows the signal wave as

shown below.

NOTE:

The pulse cycle changes depending on rpm at idle.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 10.

4.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I

BBIA0561E

PBIB1186E

SEC986C