Nissan Qashqai (2007-2010). Manual — part 421

IAT SENSOR

EC-1203

< COMPONENT DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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.

CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between mass air flow sensor harness connector and ECM harness connector.

4.

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

Is the inspection result normal?

YES

>> GO TO 4.

NO

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

4.

CHECK INTAKE AIR TEMPERATURE SENSOR

Refer to

EC-1207, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Replace mass air flow sensor (with intake air temperature sensor).

5.

CHECK INTERMITTENT INCIDENT

Refer to

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000001102136

1.

CHECK INTAKE AIR TEMPERATURE SENSOR

1.

Turn ignition switch OFF.

2.

Disconnect mass air flow sensor harness connector.

3.

Check resistance between mass air flow sensor terminals as follows.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace mass air flow sensor (with intake air temperature sensor).

MAF sensor

Ground

Voltage

Connector

Terminal

E18

2

Ground

Approx. 5V

MAF sensor

ECM

Continuity

Connector

Terminal

Connector

Terminal

E18

1

F8

55

Existed

Terminals

Resistance [

°

C (77

°

F)]

1 and 2

1.800 - 2.200 k

Ω

EC-1204

< COMPONENT DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

IGNITION SIGNAL

IGNITION SIGNAL

Description

INFOID:0000000001094308

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:0000000001094309

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-1208, "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-1208, "Diagnosis Procedure"

.

3.

IGNITION SIGNAL FUNCTION

Without CONSULT-III

1.

Let engine idle.

2.

Read the voltage signal between ECM harness connector and ground.

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to

EC-1208, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001094310

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 and ground.

ECM

Ground

Voltage signal

Connector

Terminal

F7

17

Ground

18

21

22

JMBIA0085GB

ECM

Ground

Voltage

Connector

Terminal

E16

105

Ground

Battery voltage

IGNITION SIGNAL

EC-1205

< COMPONENT DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to

EC-736, "Diagnosis Procedure"

.

2.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF.

2.

Disconnect condenser harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between condenser harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector F10.

3.

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

4.

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

Is the inspection result normal?

YES

>> Go to

EC-736, "Diagnosis Procedure"

.

NO

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

4.

CHECK CONDENSER-2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check the continuity between condenser harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK CONDENSER

Refer to

EC-1211, "Component Inspection (Condenser)"

Is the inspection result normal?

YES

>> GO TO 6.

NG

>> Replace condenser.

6.

CHECK IGNITION COIL POWER SUPPLY CIRCUIT-V

1.

Reconnect all harness connectors disconnected.

2.

Disconnect ignition coil harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between ignition coil harness connector and ground.

Condenser

Ground

Voltage

Connector

Terminal

F13

1

Ground

Battery voltage

IPDM E/R

Condenser

Continuity

Connector

Terminal

Connector

Terminal

E11

9

F13

1

Existed

Condenser

Ground

Continuity

Connector

Terminal

F13

2

Ground

Existed

EC-1206

< COMPONENT DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

IGNITION SIGNAL

Is the inspection result normal?

YES

>> GO TO 7.

NO

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

7.

CHECK IGNITION COIL GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check the continuity between ignition coil harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 8.

NO

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

8.

CHECK IGNITION COIL OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check the continuity between ECM harness connector and ignition coil harness connector.

3.

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

Is the inspection result normal?

YES

>> GO TO 9.

NO

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

9.

CHECK IGNITION COIL WITH POWER TRANSISTOR

Refer to

EC-1211, "Component Inspection (Ignition Coil with Power Transistor)"

.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace malfunctioning ignition coil with power transistor.

10.

CHECK INTERMITTENT INCIDENT

Refer to

GI-39, "Intermittent Incident"

.

>> INSPECTION END

Ignition coil

Ground

Voltage

Cylinder

Connector

Terminal

1

F33

3

Ground

Battery voltage

2

F34

3

3

F35

3

4

F36

3

Ignition coil

Ground

Continuity

Cylinder

Connector

Terminal

1

F33

2

Ground

Existed

2

F34

2

3

F35

2

4

F36

2

Ignition coil

ECM

Continuity

Cylinder

Connector

Terminal

Connector

Terminal

1

F33

1

F7

17

Existed

2

F34

1

18

3

F35

1

22

4

F36

1

21