Nissan Qashqai (2007-2010). Manual - part 405

P1572 ASCD BRAKE SWITCH

EC-1139

< COMPONENT DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

C

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EC

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Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle.
If a road test is expected to be easier, it is unnecessary to lift the vehicle.

5.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-1144, "Diagnosis Procedure"

.

NO

>> GO TO 4.

4.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

With CONSULT-III

1.

Drive the vehicle for at least 5 consecutive seconds under the following conditions.

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle.
If a road test is expected to be easier, it is unnecessary to lift the vehicle.

2.

Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Go to 

EC-1144, "Diagnosis Procedure"

.

NO

>> INSPECTION END

5.

PERFORM COMPONENT FUNCTION CHECK

Perform component check. Refer to 

EC-1143, "Component Function Check"

Use component function check to check the overall function of the ASCD brake circuit. During this check, a 1st
trip DTC might not be confirmed.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-1144, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000001116275

1.

PERFORM COMPONENT FUNCTION CHECK-I

Without CONSSULT-III

1.

Turn ignition switch ON.

2.

Check voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Go to 

EC-826, "Diagnosis Procedure"

.

VHCL SPEED SE

More than 30 km/h (19 mph)

Shift lever

Suitable position 

VHCL SPEED SE

More than 30 km/h (19 mph)

Selector lever

Suitable position 

Driving location

Depress the brake pedal for more than 
five seconds so as not to come off from 
the above-mentioned vehicle speed.

ECM

Ground

Condition

Voltage

Connector

Terminal

E16

100

(ASCD brake switch signal)

Ground

Brake pedal (CVT)
Brake pedal and clutch pedal (M/T)

Slightly depressed

Approx. 0V 

Fully released

Battery voltage

EC-1140

< COMPONENT DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

P1572 ASCD BRAKE SWITCH

2.

PERFORM COMPONENT FUNCTION CHECK-II

Without CONSSULT-III

Check voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Go to 

EC-826, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000001116083

1.

CHECK OVERALL FUNCTION-I

 With CONSULT-III

1.

Turn ignition switch ON.

2.

Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.

3.

Check “BRAKE SW1” indication under the following conditions.

 Without CONSULT-III

1.

Turn ignition switch ON.

2.

Check the voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 2.

NO-1

>> CVT models: GO TO 3.

NO-1

>> M/T models: GO TO 7.

2.

CHECK OVERALL FUNCTION-II

 With CONSULT-III

Select “BRAKE SW2” and check indication in “DATA MONITOR” mode. 

 Without CONSULT-III

Check the voltage between ECM harness connector and ground.

ECM

Ground

Condition

Voltage

Connector

Terminal

E16

99

(Stop lamp switch signal)

Ground

Brake pedal (CVT)
Brake pedal and clutch pedal (M/T)

Slightly depressed

Approx. 0V 

Fully released

Battery voltage

Monitor item

Condition

Indication

BRAKE SW1

Brake pedal (CVT)
Brake pedal and clutch pedal (M/T)

Slightly depressed

OFF

Fully released

ON

ECM

Ground

Condition

Voltage

Connector

Terminal

E16

100

(ASCD brake switch signal)

Ground

Brake pedal (CVT)
Brake pedal and clutch pedal (M/T)

Slightly depressed

Approx. 0V

Fully released

Battery voltage

Monitor item

Condition

Indication

BRAKE SW2

Brake pedal (CVT)
Brake pedal and clutch pedal (M/T)

Slightly depressed

ON

Fully released

OFF

P1572 ASCD BRAKE SWITCH

EC-1141

< 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 19.

NO

>> GO TO 14.

3.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ASCD brake switch harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between ASCD brake switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Junction block connector E105, M77
• 10A fuse (No.4)
• Harness for open or short between ASCD brake switch and fuse

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

5.

CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM ASCD harness connector.

3.

Check the continuity between ASCD brake switch 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 6.

NO

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

6.

CHECK ASCD BRAKE SWITCH

Refer to 

EC-1148, "Component Inspection (ASCD Brake Switch)"

.

Is the inspection result normal?

YES

>> GO TO 19.

NO

>> Replace ASCD brake switch.

7.

CHECK ASCD BRAKE SWITCH CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ASCD brake switch harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between ASCD brake switch harness connector and ground.

ECM

Ground

Condition

Voltage

Connector

Terminal

E16

99

(Stop lamp switch signal)

Ground

Brake pedal (CVT)
Brake pedal and clutch pedal (M/T)

Slightly depressed

Approx. 0V

Fully released

Battery voltage

ASCD brake switch

Ground

Voltage

Connector

Terminal

E112

1

Ground

Battery voltage

ASCD brake switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E112

2

E16

100

Existed

EC-1142

< COMPONENT DIAGNOSIS >

[MR20DE (WITHOUT EURO-OBD)]

P1572 ASCD BRAKE SWITCH

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 8.

8.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ASCD clutch switch harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between ASCD clutch switch harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> GO TO 9.

9.

DETECT MALFUNCTIONING PART

Check the following.
• Junction block connector E105, M77
• 10A fuse (No.4)
• Harness for open or short between ASCD brake switch and fuse

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

10.

CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check the continuity between ASCD brake switch harness connector and ASCD clutch switch harness
connector.

3.

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

Is the inspection result normal?

YES 

>> GO TO 11.

NO

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

11.

CHECK ASCD BRAKE SWITCH

Refer to 

EC-888, "Component Inspection (ASCD Brake Switch)"

.

Is the inspection result normal?

YES

>> GO TO 19.

NO

>> Replace ASCD brake switch.

12.

CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between ECM harness connector and ASCD brake switch harness connector.

ASCD Clutch switch

Ground

Condition

Voltage (V)

Connector

Terminal

E112

1

Ground

Clutch ped-
al

Slightly depressed

Approx. 0

Fully released

Battery voltage

ASCD clutch switch

Ground

Voltage

Connector

Terminal

E111

1

Ground

Battery voltage

ASCD brake switch

ASCD clutch switch

Continuity

Connector

Terminal

Connector

Terminal

E112

1

E111

2

Existed