Nissan Tiida C11. Manual - part 582

EC-978

< COMPONENT DIAGNOSIS >

[MR18DE]

FUEL PUMP

FUEL PUMP

Description

INFOID:0000000001161973

*: 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 Function Check

INFOID:0000000001161974

1.

CHECK FUEL PUMP FUNCTION

1.

Turn ignition switch ON.

2.

Pinch fuel feed hose with two fingers.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>>

EC-978, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001161975

1.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between ECM harness connector terminals as follows.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 2.

2.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-II

Sensor

Input signal to ECM

ECM Function

Actuator

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

Engine speed*

Fuel pump control

Fuel pump relay

↓

Fuel pump

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.

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

JMBIA0351ZZ

(+)

(–)

Voltage

Connector

Terminal

Connector

Terminal

F10

23

E16

108

Battery voltage

FUEL PUMP

EC-979

< COMPONENT DIAGNOSIS >

[MR18DE]

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1.

Turn ignition switch OFF.

2.

Disconnect IDPDM E/R harness connector.

3.

Check the continuity between IPDM E/R harness connector and ECM harness connector.

Is the inspection result normal?

YES

>> GO TO 3.

NO

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

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness or connectors E8, F8.
• Harness for open or short to ground and short power.

>> Repair harness or connectors.

4.

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 connector.

4.

Turn ignition switch ON.

5.

Check voltage between “fuel level sensor unit and fuel pump” harness connector and ground. 

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 5.

5.

CHECK 10A FUSE

1.

Turn ignition switch OFF.

2.

Disconnect 15A fuse (No. 48) from IPDM E/R.

3.

Check 15A fuse.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Replace fuse.

6.

CHECK FUEL PUMP POWER SUPPLY CIRCUIT-IV

1.

Disconnect IPDM E/R harness connector.

2.

Check the continuity between IPDM E/R harness connector and “fuel level sensor unit and fuel pump”
harness connector.

3.

Also check harness for short to ground and short to power.

Is the inspection result normal?

YES

>> GO TO 10.

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F10

23

E46

47

Existed

Fuel level sensor unit 

and fuel pump

Ground

Voltage

Connector

Terminal

B40

1

Ground

Battery voltage should exist 1 
second after ignition switch is 
turn ON.

IPDM E/R

Fuel level sensor unit and 

fuel pump

Continuity

Connector

Terminal

Connector

Terminal

E45

36

B40

1

Existed

EC-980

< COMPONENT DIAGNOSIS >

[MR18DE]

FUEL PUMP

NO

>> GO TO 7.

7.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E7, M69, M12, B1.
• Harness for open or short between IPDM E/R and “fuel level sensor unit and fuel pump” 

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

8.

CHECK FUEL PUMP GROUND CIRCUIT

1.

Check the continuity between “fuel level sensor unit and fuel pump” and ground. 

2.

Also heck harness for short to power. 

Is the inspection result normal?

YES

>> GO TO 9.

NO

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

9.

CHECK FUEL PUMP

Refer to 

EC-980, "Component Inspection (Fuel Pump)"

.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace fuel pump.

10.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-55, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

>> Repair or replace harness or connectors.

Component Inspection (Fuel Pump)

INFOID:0000000001161976

1.

CHECK FUEL PUMP

1.

Turn ignition switch OFF.

2.

Disconnect “fuel level sensor unit and fuel pump” harness connector.

3.

Check resistance between “fuel level sensor unit and fuel pump” terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

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

Fuel level sensor unit 

and fuel pump

Ground

Continuity

Connector

Terminal

B40

3

Ground

Existed

Terminals

Resistance

1 and 3

0.2 - 5.0 

Ω

 [at 25

°

C (77

°

F)]

IGNITION SIGNAL

EC-981

< COMPONENT DIAGNOSIS >

[MR18DE]

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IGNITION SIGNAL

Description

INFOID:0000000001161977

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.

Component Function Check

INFOID:0000000001161978

1.

INSPECTION START

Turn ignition switch OFF, and restart engine.

Does the engine start?

YES-1 >> With CONSULT-III: GO TO 2.
YES-2 >> Without CONSULT-III: GO TO 3.
NO

>> Go to 

EC-981, "Diagnosis Procedure"

.

2.

IGNITION SIGNAL FUNCTION

With CONSULT-III

1.

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

2.

Make sure that each circuit produces a momentary engine speed drop.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-981, "Diagnosis Procedure"

.

3.

IGNITION SIGNAL FUNCTION

 Without CONSULT-III

1.

Let engine idle.

2.

Read the voltage signal between ECM harness connector terminals as follows.

NOTE:
The pulse cycle changes depending on rpm at idle.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-981, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001161979

1.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF, wait at least 10 seconds and then turn ON.

2.

Check the voltage between ECM harness connector terminals as follows.

ECM

Ground

Voltage signal

Connector

Terminal

Connector

Terminal

F10

17

E16

108

18

21

22

JMBIA0329GB

(+)

(–)

Voltage

Connector

Terminal

Connector

Terminal

E16

105

E16

108

Battery voltage