Nissan Titan A60. Manual - part 445

EC-446

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

FUEL PUMP

FUEL PUMP

Description

INFOID:0000000006158929

SYSTEM DESCRIPTION

*: ECM determines the start signal status by the signals of engine speed and battery voltage.

The ECM activates the fuel pump for several seconds after the ignition switch is turned ON to improve engine

startability. If the ECM receives a engine speed signal from the camshaft position sensor (PHASE), it knows

that the engine is rotating, and causes the pump to operate. If the engine speed signal is not received when

the ignition switch is ON, the engine stalls. The ECM stops pump operation and prevents battery discharging,

thereby improving safety. The ECM does not directly drive the fuel pump. It controls the ON/OFF fuel pump

relay, which in turn controls the fuel pump.

COMPONENT DESCRIPTION

A turbine type design fuel pump is used in the fuel tank.

Diagnosis Procedure

INFOID:0000000006158930

EXCEPT FLEXIBLE FUEL VEHICLE

1.

CHECK OVERALL FUNCTION

1. Turn ignition switch ON.

2. Pinch fuel feed hose with two fingers.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF.

Sensor

Input signal to ECM

ECM Function

Actuator

Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)

Engine speed*

Fuel pump control

Fuel pump relay

Battery

Battery voltage*

Condition

Fuel pump operation

Ignition switch is turned to ON

Operates for 1 second.

Engine running and cranking

Operates.

When engine is stopped

Stops in 1.5 seconds.

Except as shown above

Stops.

BBIA0402E

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

BBIA0357E

FUEL PUMP

EC-447

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

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2. Disconnect ECM harness connector.

3. Turn ignition switch ON.

4. Check voltage between ECM terminal 113 and ground with

CONSULT-III 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-III or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 13.

4.

DETECT MALFUNCTIONING PART

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

>> Repair harness or connectors.

5.

CHECK CONDENSER-2 POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Reconnect all harness connectors disconnected.

3. Disconnect condenser-2 harness connector.

4. Turn ignition switch ON.

5. Check voltage between condenser-2 terminal 1 and ground with

CONSULT-III or tester. 

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

OK

>> GO TO 8.

NG

>> GO TO 6.

Voltage: Battery voltage 

PBIB1187E

Voltage: Battery voltage

PBIB2656E

BBIA0388E

Voltage:

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

PBIB0624E

EC-448

< DTC/CIRCUIT DIAGNOSIS >

[VK56DE]

FUEL PUMP

6.

CHECK 15A FUSE

1. Turn ignition switch OFF.

2. Disconnect 15A fuse.

3. Check 15A fuse.
OK or NG

OK

>> GO TO 7.

NG

>> Replace fuse.

7.

CHECK CONDENSER-2 POWER SUPPLY CIRCUIT-II FOR OPEN AND SHORT

1. Disconnect IPDM E/R harness connector E119.

2. Check harness continuity between IPDM E/R terminal 13 and condenser-2 terminal 1.

Refer to Wiring Diagram. 

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

OK

>> GO TO 13.

NG

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

8.

CHECK CONDENSER-2 GROUND CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between condenser-2

+ terminal 2 and ground.

Refer to Wiring Diagram.

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

OK

>> GO TO 9.

NG

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

9.

CHECK CONDENSER-2

Refer to 

EC-452, "Component Inspection"

.

OK or NG

OK

>> GO TO 10.

NG

>> Replace condenser-2.

10.

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 con-

nector.

3. Disconnect IPDM E/R harness connector E119.

4. Check harness continuity between IPDM E/R terminal 13 and

“fuel level sensor unit and fuel pump” terminal 1, “fuel level sen-

sor unit and fuel pump” terminal 3 and ground.

Refer to Wiring Diagram. 

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

OK

>> GO TO 12.

NG

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.

• Harness connectors E41, C1

Continuity should exist.

Continuity should exist.

Continuity should exist.

BBIA0583E

FUEL PUMP

EC-449

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• Harness for open or short between fuel pump and IPDM E/R

• Harness for open or short between fuel pump and ground

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

12.

CHECK FUEL PUMP

Refer to 

EC-452, "Component Inspection"

.

OK or NG

OK

>> GO TO 13.

NG

>> Replace “fuel level sensor unit and fuel pump”.

13.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "How to Check Terminal"

 and 

GI-39, "Intermittent Incident"

.

OK or NG

OK

>> Replace IPDM E/R.

NG

>> Repair or replace harness or connectors.

FLEXIBLE FUEL VEHICLE

1.

CHECK OVERALL FUNCTION

1. Turn ignition switch ON.

2. Pinch fuel feed hose with two fingers.

OK or NG

OK

>> INSPECTION END

NG

>> GO TO 2.

2.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Turn ignition switch ON.

4. Check voltage between ECM terminal 113 and ground with

CONSULT-III or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 3.

3.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

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

BBIA0357E

Voltage: Battery voltage 

PBIB1187E