Infiniti EX35. Manual - part 664

EC-398

< COMPONENT DIAGNOSIS >

[VQ35HR]

P1564 ICC STEERING SWITCH

Check the following.
• 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.

5.

CHECK ICC STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check the continuity between combination switch and ECM harness connector.

2.

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

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 6.

6.

DETECT MALFUNCTIONING PART

Check the following.
• 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.

7.

CHECK ICC STEERING SWITCH

Refer to 

EC-398, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace ICC steering switch.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-38, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000003133570

1.

CHECK ICC STEERING SWITCH

1.

Turn ignition switch OFF.

2.

Disconnect combination switch (spiral cable) harness connector M303.

3.

Check resistance between combination switch harness connector terminals under the following condi-
tions.

Is the inspection result normal?

Combination switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

M303

13

M107

101

Existed

Combination switch

Condition

Resistance (

Ω

)

Connector

Terminals

M303

13 and 16

MAIN switch: Pressed

Approx. 0

LDP switch: Pressed

Approx. 270

CANCEL switch: Pressed

Approx. 620

DISTANCE switch: Pressed

Approx. 1,100

SET/COAST switch: Pressed

Approx. 1,810

RESUME/ACCELERATE switch: Pressed

Approx. 3,000

All ICC steering switches: Released

Approx. 5,420

P1564 ICC STEERING SWITCH

EC-399

< COMPONENT DIAGNOSIS >

[VQ35HR]

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YES

>> INSPECTION END

NO

>> Replace ICC steering switch

EC-400

< COMPONENT DIAGNOSIS >

[VQ35HR]

P1568 ICC FUNCTION

P1568 ICC FUNCTION

DTC Logic

INFOID:0000000003133571

DTC DETECTION LOGIC

NOTE:
• If DTC P1568 is displayed with DTC U1000 or U1001, first perform the trouble diagnosis for DTC

U1000, U1001. Refer to 

EC-136, "DTC Logic"

.

• If DTC P1568 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-338, "DTC Logic"

.

• If DTC P1568 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer

to 

EC-336, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON.

2.

Press MAIN switch on ICC steering switch.

3.

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

CAUTION:

Always drive vehicle at a safe speed.

4.

Press SET/COAST switch.

5.

Check DTC.

Is DTC detected?

YES

>> Go to 

EC-400, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000003133572

1.

REPLACE ICC SENSOR INTEGRATED UNIT

1.

Replace ICC sensor integrated unit.

2.

Perform 

CCS-13, "ACTION TEST : Special Repair Requirement (Vehicle-To-Vehicle Distance Control

Mode)"

.

3.

Check DTC of ICC sensor integrated unit. Refer to 

CCS-23, "Diagnosis Description"

.

>> INSPECTION END

DTC No.

Trouble Diagnosis 

Name

DTC Detecting Condition

Possible Cause

P1568

ICC function

ECM detects a difference between signals 
from ICC sensor integrated unit is out of spec-
ified range.

• Harness or connectors

(The CAN communication line is open or 
shorted.)

• ICC sensor integrated unit
• ECM

P1572 ASCD BRAKE SWITCH

EC-401

< COMPONENT DIAGNOSIS >

[VQ35HR]

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P1572 ASCD BRAKE SWITCH

Description

INFOID:0000000003133573

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 this input of two kinds (ON/OFF signal).
Refer to 

EC-56, "System Description"

 for the ASCD function.

DTC Logic

INFOID:0000000003133574

DTC DETECTION LOGIC

NOTE:
• If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer

to 

EC-336, "DTC Logic"

.

• 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 OFF. And even when malfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
NOTE:
Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for mal-
function B. By performing procedure for malfunction A, the incident that causes malfunction B can be
detected.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

With CONSULT-III

1.

Start engine (VDC switch OFF).

2.

Select “DATA MONITOR” mode with CONSULT-III.

3.

Press MAIN switch and make sure that CRUISE lamp lights up.

4.

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.

5.

Check 1st trip DTC.

With GST

DTC No.

Trouble diagnosis 

name

DTC detecting condition

Possible cause

P1572

ASCD brake switch

A)

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

B)

ASCD brake switch signal is not sent to 
ECM for extremely long time while the ve-
hicle is driving.

VHCL SPEED SE

More than 30 km/h (19 mph)

Selector lever

Suitable position