Infiniti FX35, FX50 (S51). Manual - part 1800

DIAGNOSIS AND REPAIR WORK FLOW

TM-7

< BASIC INSPECTION >

[7AT: RE7R01A (VQ35HR)]

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BASIC INSPECTION

DIAGNOSIS AND REPAIR WORK FLOW

Diagnosis Flow

INFOID:0000000005249988

1.

OBTAIN INFORMATION ABOUT SYMPTOM

1.

Refer to 

TM-8, "Question sheet"

 and interview the customer to obtain the malfunction information (condi-

tions and environment when the malfunction occurred) as much as possible when the customer brings in
the vehicle.

2.

Check the following:

-

Service history

-

Harnesses and connectors malfunction. Refer to 

GI-36, "Intermittent Incident"

.

>> GO TO 2.

2.

CHECK DTC

1.

Before checking the malfunction, check whether any DTC exists.

2.

If DTC exists, perform the following operations.

-

Record the DTC and freeze frame data. (Print out the data using CONSULT-III and affix to the Work Order
Sheet.)

-

Erase DTCs.

-

Check the relationship between the cause that is clarified with DTC and the malfunction information
described by the customer. 

TM-152, "Symptom Table"

 is effective.

3.

Check the information of related service bulletins and others also.

Do malfunction information and DTC exist?

Malfunction information and DTC exists. >>GO TO 3.
Malfunction information exists, but no DTC. >>GO TO 4.
No malfunction information, but DTC exists. >>GO TO 5.

3.

REPRODUCE MALFUNCTION SYMPTOM

Check any malfunction described by a customer, except those with DTC on the vehicle.
Also investigate whether the symptom is a fail-safe or normal operation. Refer to 

TM-146, "Fail-Safe"

.

When a malfunction symptom is reproduced, the question sheet is effective. Refer to 

TM-8, "Question sheet"

.

Verify the relationship between the symptom and the conditions in which the malfunction described by the cus-
tomer occurs.

 

>> GO TO 5.

4.

REPRODUCE MALFUNCTION SYMPTOM

Check the malfunction described by the customer on the vehicle.
Also investigate whether the symptom is a fail-safe or normal operation. Refer to 

TM-146, "Fail-Safe"

.

When a malfunction symptom is reproduced, the question sheet is effective. Refer to 

TM-8, "Question sheet"

.

Verify the relationship between the symptom and the conditions in which the malfunction described by the cus-
tomer occurs.

 

>> GO TO 6.

5.

PERFORM “DTC CONFIRMATION PROCEDURE”

Perform “DTC CONFIRMATION PROCEDURE” of the appropriate DTC to check if DTC is detected again.
Refer to 

TM-150, "DTC Inspection Priority Chart"

 when multiple DTCs are detected, and then determine the

order for performing the diagnosis.
NOTE:
If no DTC is detected, refer to the freeze frame data.

Is any DTC detected?

YES

>> GO TO 7.

NO

>> Check according to 

GI-36, "Intermittent Incident"

.

TM-8

< BASIC INSPECTION >

[7AT: RE7R01A (VQ35HR)]

DIAGNOSIS AND REPAIR WORK FLOW

6.

IDENTIFY MALFUNCTIONING SYSTEM WITH “DIAGNOSIS CHART BY SYMPTOM”

Use 

TM-152, "Symptom Table"

 from the symptom inspection result in step 4. Then identify where to start per-

forming the diagnosis based on possible causes and symptoms.

>> GO TO 8.

7.

REPAIR OR REPLACE THE MALFUNCTIONING PARTS

Repair or replace the detected malfunctioning parts.
Reconnect parts or connector after repairing or replacing, and then erase DTC if necessary.

>> GO TO 8.

8.

FINAL CHECK

Perform “DTC CONFIRMATION PROCEDURE” again to make sure that the repair is correctly performed.
Check that malfunctions are not reproduced when obtaining the malfunction information from the customer,
referring to the symptom inspection result in step 3 or 4.
Is DTC or malfunction symptom reproduced?

YES-1 >> DTC is reproduced: GO TO 5.
YES-2 >> Malfunction symptom is reproduced: GO TO 6.
NO

>> Before delivering the vehicle to the customer, make sure that DTC is erased.

Question sheet

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DESCRIPTION

There are many operating conditions that may cause a malfunction
of the transmission parts. By understanding those conditions prop-
erly, a quick and exact diagnosis can be achieved.
In general, customers have their own criteria for a problem. There-
fore, it is important to understand the symptom and status well
enough by asking the customer about the concerns carefully. In
order to systemize all the information for the diagnosis, prepare the
question sheet referring to the question points.

WORKSHEET SAMPLE

SEF907L

Question Sheet

Customer name       MR/MS

Engine #

Manuf. Date

Incident Date

VIN

Model & Year

In Service Date

Trans.

Mileage

km/Mile

DIAGNOSIS AND REPAIR WORK FLOW

TM-9

< BASIC INSPECTION >

[7AT: RE7R01A (VQ35HR)]

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Symptoms

†

 Vehicle does not move     (

†

 Any position

†

 Particular position                                          )

†

 No up-shift     (

†

 1GR 

→

 2GR

†

 2GR 

→

 3GR

†

 3GR 

→

 4GR

†

 4GR 

→

 5GR

†

 5GR 

→

 

6GR

†

 6GR 

→

 7GR)

†

 No down-shift     (

†

 7GR 

→

 6GR

†

 6GR 

→

 5GR

†

 5GR 

→

 4GR

†

 4GR 

→

 3GR

†

 3GR 

→

 

2GR

†

 2GR 

→

 1GR)

†

 Lock-up malfunction

†

 Shift point too high or too low

†

 Shift shock or slip

†

 Noise or vibration

†

 No kick down

†

 No pattern select

†

 Others

Frequency

†

 All the time

†

 Under certain conditions

†

 Sometimes (           times a day)

Weather conditions

†

 Not affected

Weather

†

 Fine

†

 Clouding

†

 Raining

†

 Snowing

†

 Other (                                        )

Temp.

†

 Hot

†

 Warm

†

 Cool

†

 Cold

†

 Temp. [Approx.       

°

C (       

°

F)]

Humidity

†

 High

†

 Middle

†

 Low

Transmission conditions

†

 Not affected

†

 Cold

†

 During warm-up

†

 After warm-up

†

 Engine speed (                                         rpm)

Road conditions

†

 Not affected

†

 In town

†

 In suburbs

†

 Freeway

†

 Off road (Up / Down)

Driving conditions

†

 Not affected

†

 At starting

†

 While idling

†

 While engine racing

†

 At racing

†

 While cruis-

ing

†

 While accelerating

†

 While decelerating

†

 While turning (Right / Left)

†

 Vehicle speed [                          km/h (                   MPH)]

Other conditions

Question Sheet

TM-10

< SYSTEM DESCRIPTION >

[7AT: RE7R01A (VQ35HR)]

A/T CONTROL SYSTEM

SYSTEM DESCRIPTION

A/T CONTROL SYSTEM

System Diagram

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System Description

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INPUT/OUTPUT SIGNAL CHART

SYSTEM DESCRIPTION

• The A/T senses vehicle operating conditions through various sensors or signals. It always controls the opti-

mum shift position and reduces shifting and lock-up shocks.

• Receive input signals transmitted from various switches and sensors.
• Determine required line pressure, shifting point, lock-up operation, etc.
• Transmit required output signals to the respective solenoids.

JSDIA1472GB

Switch, Sensor or Signal

⇒

TCM function

⇒

Actuator

• Transmission range switch
• Accelerator pedal position sig-

nal

• Closed throttle position signal
• Wide open throttle position sig-

nal

• Engine speed signal
• A/T fluid temperature sensor
• Output speed sensor
• Vehicle speed signal
• Manual mode switch signal
• Stop lamp switch signal
• Side G sensor signal
• Input speed sensor 1, 2

• Line pressure control (

TM-13

)

• Shift change control (

TM-17

)

• Shift pattern control
- Shift pattern (

TM-22

)

- Manual mode (

TM-26

)

• Lock-up control (

TM-29

)

• Fail-safe control (

TM-146

)

• Self-diagnosis (

TM-62

)

• CONSULT-III communication line (

TM-

62

)

• CAN communication line (

TM-68

)

• Input clutch solenoid valve 
• Direct clutch solenoid valve 
• Front brake solenoid valve
• High and low reverse clutch solenoid 

valve

• Low brake solenoid valve
• Torque converter clutch solenoid valve
• Line pressure solenoid valve
• Anti-interlock solenoid valve
• 2346 brake solenoid valve
• A/T CHECK indicator lamp
• Back-up  lamp  relay
• Starter relay