Infiniti F50. Manual - part 53

TROUBLE DIAGNOSIS

AT-97

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DTC WORK SUPPORT MODE

*: Do not use, but displayed.

Diagnostic Procedure Without CONSULT-II

ECS0083K

 OBD-II SELF-DIAGNOSTIC PROCEDURE (WITH GST)

Refer to 

EC-121, "Generic Scan Tool (GST) Function"

 .

 OBD-II SELF-DIAGNOSTIC PROCEDURE (NO TOOLS)

Refer to 

EC-65, "Malfunction Indicator Lamp (MIL)"

 .

 TCM SELF-DIAGNOSTIC PROCEDURE (NO TOOLS)

Description

In the unlikely event of a malfunction in the electrical system, when the ignition switch is switched “ON”, 
the A/T CHECK indicator lamp lights up for 2 seconds, then flashes for 8 seconds. If there is no malfunction,
when the ignition switch is turned “ON”, the indicator lamp lights up for 2 seconds. As a method for locating the
suspect circuit, when the self-diagnostics start signal is input, the memory for the malfunction location is output
and the A/T CHECK indicator lamp flashes to display the corresponding DTC.

Diagnostic procedure

1. 

CHECK A/T CHECK INDICATOR LAMP

1.

Start the engine with selector lever in “P” position. Warm engine to normal operating temperature.

2.

Turn ignition switch “ON” and “OFF” at least twice, then leave it in the “OFF” position. 

3.

Wait 10 seconds.

4.

Turn ignition switch to “ON” position.
(Do not start engine.)

5.

Does A/T CHECK indicator lamp come on for about 2 seconds?

Yes or No

Yes

>> GO TO 2.

No

>> GO TO 

AT-238, "A/T CHECK Indicator Lamp does not come on"

 .

DTC work support item

Description

Check item

I/C SOL FUNCTN CHECK*

—

—

FR/B SOL FUNCTN CHECK*

—

—

D/C SOL FUNCTN CHECK*

—

—

HLR/C SOL FUNCTN CHECK*

—

—

LC/B SOL FUNCTN CHECK*

—

—

TCC SOL FUNCTN CHECK

Following items for “TCC solenoid function (lock-up) ” can be con-
firmed.

●

Self-diagnosis status (whether the diagnosis is being conducted 
or not)

●

Self-diagnosis result (OK or NG)

●

TCC solenoid valve

●

Hydraulic control circuit

AT-98

TROUBLE DIAGNOSIS

2. 

JUDGEMENT PROCEDURE STEP 1

1.

Turn ignition switch “OFF”.

2.

Push shift lock release button.

3.

Move selector lever from “P” to “D” position.

4.

Release accelerator pedal. (Set the closed throttle position signal “ON”.)

5.

Depress brake pedal. (Brake switch signal “ON”.)

6.

Turn ignition switch “ON”.

7.

Wait 3 seconds.

8.

Move the selector lever to the Manual shift gate side. (Manual mode switch “ON”.)

9.

Release brake pedal. (Brake switch signal “OFF”.)

10. Move the selector lever to “D” position. (Manual mode switch “OFF”.)

11. Depress brake pedal. (Brake switch signal “ON”.)

12. Release brake pedal. (Brake switch signal “OFF”.)

13. Depress accelerator pedal fully and release it.

>> GO TO 3.

3. 

CHECK SELF-DIAGNOSIS CODE

Check A/T CHECK indicator lamp.
Refer to 

AT-98, "Judgement self-diagnosis code"

 .

If the system does not go into self-diagnostics. Refer to 

AT-235, "PARK/NEUTRAL POSITION, MANUAL

MODE, BRAKE AND THROTTLE POSITION SWITCH CIRCUIT"

 .

>> DIAGNOSIS END

Judgement self-diagnosis code

If there is a malfunction, the lamp lights up for the time corresponding to the suspect circuit.

Erase self-diagnosis

●

In order to make it easier to find the cause of hard-to-duplicate malfunctions, malfunction information is
stored into the control unit as necessary during use by the user. This memory is not erased no matter how
many times the ignition switch is turned ON and OFF. 

●

However, this information is erased by turning ignition switch “OFF” after executing self-diagnostics or by
erasing the memory using the CONSULT-II.

SCIA0497E

DTC U1000 CAN COMMUNICATION LINE

AT-99

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DTC U1000 CAN COMMUNICATION LINE

PFP:23710

Description

ECS0083L

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-
tiplex communication line with high data communication speed and excellent malfunction detection ability.
Many electronic control units are equipped onto a vehicle, and each control unit shares information and links
with other control units during operation (not independent). In CAN communication, control units are con-
nected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission
with less wiring. Each control unit transmits/receives data but selectively reads required data only.

On Board Diagnosis Logic

ECS0083M

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This is an OBD-II self-diagnostic item.

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Diagnostic trouble code “CAN COMM CIRCUIT” with CONSULT-II or U1000 without CONSULT-II is
detected when TCM cannot communicate to other control units.

Possible Cause

ECS0083N

Harness or connectors
(CAN communication line is open or shorted.)

DTC Confirmation Procedure

ECS0083O

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF”
and wait at least 10 seconds before conducting the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

 WITH CONSULT-II

1.

Turn ignition switch to “ON” position. (Do not start engine.)

2.

Select “DATA MONITOR” mode for “ENGINE” with CONSULT-II.

3.

Start engine and wait for at least 6 seconds.

4.

If DTC is detected, go to 

AT-101, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

SAT014K

AT-100

DTC U1000 CAN COMMUNICATION LINE

Wiring Diagram — AT — CAN

ECS0083P

TCM terminals and data are reference value.

TCWM0032E

Terminal   

No.

Wire 

color

Item

Condition

Data (Approx.)

6

LG/B

CAN H

–

–

7

P/B

CAN L

–

–