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
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.
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
When a malfunction symptom is reproduced, the question sheet is effective. Refer to
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
When a malfunction symptom is reproduced, the question sheet is effective. Refer to
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
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
INFOID:0000000005249989
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
INFOID:0000000005249990
System Description
INFOID:0000000005249991
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 (
• Shift change control (
)
• Shift pattern control
- Shift pattern (
)
- Manual mode (
)
• Lock-up control (
)
• Fail-safe control (
• Self-diagnosis (
• CONSULT-III communication line (
• CAN communication line (
)
• 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
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