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Nissan Pathfinder (2009 year). Manual - part 350

EC-814

< COMPONENT DIAGNOSIS >

[VK56DE]

P1564 ASCD STEERING SWITCH

Turn ignition switch OFF.

Disconnect combination switch harness connector M102.

Disconnect ECM harness connector.

Check harness continuity between combination switch terminal 15 and ECM terminal 67.
Refer to Wiring Diagram.

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

OK or NG

>> GO TO 5.

>> GO TO 4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors M31, E152
• Harness connectors E5, F14
• Combination switch (spiral cable)
• Harness for open and short between ECM and combination switch

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

CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check harness continuity between ECM terminal 99 and combination switch terminal 14.
Refer to Wiring Diagram.

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

OK or NG

>> GO TO 7.

>> GO TO 6.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors M31, E152
• Combination switch (spiral cable)
• Harness for open and short between ECM and combination switch

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

CHECK ASCD STEERING SWITCH

Refer to

EC-814, "Component Inspection"

OK or NG

>> GO TO 8.

>> Replace ASCD steering switch.

CHECK INTERMITTENT INCIDENT

Refer to

GI-49, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000003936784

ASCD STEERING SWITCH

Disconnect combination switch (spiral cable) harness connector M102.

Continuity should exist.

2009 Pathfinder

P1564 ASCD STEERING SWITCH

EC-815

< COMPONENT DIAGNOSIS >

[VK56DE]

Check continuity between combination switch (spiral cable) ter-
minals 14 and 15 with pushing each switch.

Switch

Condition

Resistance [

Ω

]

MAIN switch

Pressed

Approx. 0

Released

Approx. 4,000

CANCEL switch

Pressed

Approx. 250

Released

Approx. 4,000

RESUME/ACCELERATE
switch

Pressed

Approx. 1,480

Released

Approx. 4,000

SET/COAST switch

Pressed

Approx. 660

Released

Approx. 4,000

PBIB0967E

2009 Pathfinder

EC-816

< COMPONENT DIAGNOSIS >

[VK56DE]

P1572 ASCD BRAKE SWITCH

P1572 ASCD BRAKE SWITCH

Component Description

INFOID:0000000003936785

When the brake pedal is depressed, ASCD brake switch is turned
OFF and stop lamp switch is turned ON. ECM detects the state of
the brake pedal by two kinds of input (ON/OFF signal).
Refer to

EC-516, "System Description"

for the ASCD function.

On Board Diagnosis Logic

INFOID:0000000003936786

• This self-diagnosis has the one trip detection logic.
• The MIL will not illuminate for this self-diagnosis.
NOTE:
• If DTC P 1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer

EC-772, "DTC Confirmation Procedure"

• This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not

stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when ignition switch is turned OFF. And even when malfunction A is detected
in two consecutive trips, DTC is not stored in ECM memory.

DTC Confirmation Procedure

INFOID:0000000003936787

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
• Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for

malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be
detected.

• If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Steps 3 and 5 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.

Start engine (VDC switch OFF).

Press MAIN switch and check that CRUISE indicator illuminates.

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

BBIA0560E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1572
1572

ASCD brake switch

When the vehicle speed is above 30km/
h (19 MPH), ON signals from the stop
lamp switch and the ASCD brake switch
are sent to ECM at the same time.

• Harness or connectors

(The stop lamp switch circuit is shorted.)

• Harness or connectors

(The ASCD brake switch circuit is shorted.)

• Stop lamp switch
• ASCD brake switch
• Incorrect stop lamp switch installation
• Incorrect ASCD brake switch installation
• ECM

ASCD brake switch signal is not sent to
ECM for extremely long time while the
vehicle is being driven.

2009 Pathfinder

P1572 ASCD BRAKE SWITCH

EC-817

< COMPONENT DIAGNOSIS >

[VK56DE]

Check 1st trip DTC.
If 1st trip DTC is detected, go to

EC-817, "Diagnosis Procedure"

If 1st trip DTC is not detected, go to the following step.

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

Check 1st trip DTC.

If 1st trip DTC is detected, go to

EC-817, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000003936788

CHECK OVERALL FUNCTION-I

With CONSULT-III

Turn ignition switch ON.

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

Check “BRAKE SW1” indication under the following conditions.

Without CONSULT-III

Turn ignition switch ON.

Check voltage between ECM terminal 108 and ground under the
following conditions.

OK or NG

>> GO TO 2.

>> GO TO 3.

CHECK OVERALL FUNCTION-II

With CONSULT-III

Check “BRAKE SW2” indication in “DATA MONITOR” mode.

Without CONSULT-III

Check voltage between ECM terminal 101 and ground under the following conditions.

Vehicle speed

More than 30 km/h (19 MPH)

Selector lever

Suitable position

Vehicle speed

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 condition.

CONDITION

INDICATION

Brake pedal: Fully released

Brake pedal: Slightly depressed

OFF

CONDITION

VOLTAGE

Brake pedal: Fully released

Battery voltage

Brake pedal: Slightly depressed

Approximately 0V

MBIB0061E

CONDITION

INDICATION

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

2009 Pathfinder

EC-818

< COMPONENT DIAGNOSIS >

[VK56DE]

P1572 ASCD BRAKE SWITCH

OK or NG

>> GO TO 11.

>> GO TO 7.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

Turn ignition switch OFF.

Disconnect ASCD brake switch harness connector.

Turn ignition switch ON.

Check voltage between ASCD brake switch terminal 1 and
ground with CONSULT-III or tester.

OK or NG

>> GO TO 5.

>> GO TO 4.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E160
• 10 A fuse (No. 12)
• 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.

CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect ECM harness connector.

Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.

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

OK or NG

>> GO TO 6.

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

CONDITION

VOLTAGE

Brake pedal: Fully released

Approximately 0V

Brake pedal: Slightly depressed

Battery voltage

PBIB1537E

BBIA0560E

Voltage: Battery voltage

PBIB0857E

Continuity should exist.

2009 Pathfinder

P1572 ASCD BRAKE SWITCH

EC-819

< COMPONENT DIAGNOSIS >

[VK56DE]

CHECK ASCD BRAKE SWITCH

Refer to

EC-820, "Component Inspection"

OK or NG

>> GO TO 11.

>> Replace ASCD brake switch.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

Turn ignition switch OFF.

Disconnect stop lamp switch harness connector.

Check voltage between stop lamp switch terminal 1 and ground
with CONSULT-III or tester.

OK or NG

>> GO TO 9.

>> GO TO 8.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector E160
• 10 A fuse (No.20)
• Harness for open or short between stop lamp switch and battery

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

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Disconnect ECM harness connector.

Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.

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

OK or NG

>> GO TO 10.

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

10.

CHECK STOP LAMP SWITCH

Refer to

EC-820, "Component Inspection"

OK or NG

>> GO TO 11.

>> Replace stop lamp switch.

BBIA0560E

Voltage: Battery voltage

PBIB1184E

Continuity should exist.

2009 Pathfinder

EC-820

< COMPONENT DIAGNOSIS >

[VK56DE]

P1572 ASCD BRAKE SWITCH

11.

CHECK INTERMITTENT INCIDENT

Refer to

GI-49, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000003936789

ASCD BRAKE SWITCH

Turn ignition switch OFF.

Disconnect ASCD brake switch harness connector.

Check harness continuity between ASCD brake switch terminals
1 and 2 under the following conditions.

If NG, adjust ASCD brake switch installation, refer to

BR-23,

"Removal and Installation"

, and perform step 3 again.

STOP LAMP SWITCH

Turn ignition switch OFF.

Disconnect stop lamp switch harness connector.

Check harness continuity between stop lamp switch terminals 1
and 2 under the following conditions.

If NG, adjust stop lamp switch installation, refer to

BR-23,

"Removal and Installation"

, and perform step 3 again.

Condition

Continuity

Brake pedal: Fully released

Should exist.

Brake pedal: Slightly depressed

Should not exist.

SEC023D

Condition

Continuity

Brake pedal: Fully released

Should not exist.

Brake pedal: Slightly depressed

Should exist.

PBIB1185E

2009 Pathfinder

P1574 ASCD VEHICLE SPEED SENSOR

EC-821

< COMPONENT DIAGNOSIS >

[VK56DE]

P1574 ASCD VEHICLE SPEED SENSOR

Component Description

INFOID:0000000003936790

The ECM receives two vehicle speed signals via the CAN communication line. One is sent from combination
meter (unified meter control unit) and the other is from TCM. The ECM uses these signals for ASCD control.
Refer to

EC-516, "System Description"

for ASCD functions.

On Board Diagnosis Logic

INFOID:0000000003936791

• This self-diagnosis has the one trip detection logic.
• The MIL will not illuminate for this self-diagnosis.
NOTE:
• If DTC P1574 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer

EC-761, "DTC Confirmation Procedure"

• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer

EC-772, "DTC Confirmation Procedure"

• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

EC-774, "DTC Confirmation Procedure"

DTC Confirmation Procedure

INFOID:0000000003936792

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next step.
1.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Step 2 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.

Start engine (VDC switch OFF).

Drive the vehicle at more than 40 km/h (25 MPH).

Check DTC.

If DTC is detected, go to

EC-821, "Diagnosis Procedure"

Diagnosis Procedure

INFOID:0000000003936793

CHECK DTC WITH TCM

Check DTC with TCM. Refer to

TM-34, "OBD-II Diagnostic Trouble Code (DTC)"

OK or NG

>> GO TO 2.