Infiniti G35 (V35). Manual — part 13
TROUBLE DIAGNOSIS
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How To Perform Trouble Diagnosis for Quick and Accurate Repair
NCS000BT
INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, accelera-
tor pedal position sensor (throttle position sensor) or PNP switch and
provides shift control or lock-up control via A/T solenoid valves.
The TCM also communicates with the ECM by means of a signal
sent from sensing elements used with the OBD-related parts of the
A/T system for malfunction-diagnostic purposes. The TCM is capa-
ble of diagnosing malfunctioning parts while the ECM can store mal-
functions in its memory.
Input and output signals must always be correct and stable in the
operation of the A/T system. The A/T system must be in good oper-
ating condition and be free of valve seizure, solenoid valve malfunc-
tion, etc.
It is much more difficult to diagnose a error that occurs intermittently
rather than continuously. Most intermittent errors are caused by poor
electric connections or improper wiring. In this case, careful check-
ing of suspected circuits may help prevent the replacement of good
parts.
A visual check only may not find the cause of the errors. A road test
with CONSULT-II (or GST) or a circuit tester connected should be
performed. Follow the
Before undertaking actual checks, take a few minutes to talk with a
customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such errors, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “Diagnostic Worksheet” as shown on
the example (Refer to
Start your diagnosis by looking for “conventional” errors first. This will
help troubleshoot driveability errors on an electronically controlled
engine vehicle.
Also check related Service bulletins.
SAT631IB
SAT632I
SEF234G
AT-44
TROUBLE DIAGNOSIS
WORK FLOW
A good understanding of the malfunction conditions can make troubleshooting faster and more accurate.
In general, each customer feels differently about a malfunction. It is important to fully understand the symp-
toms or conditions for a customer complaint.
Make good use of the two sheets provided,
AT-45, "Information From Customer"
, to perform the best troubleshooting possible.
Work Flow Chart
*1.
*2.
*3.
*4.
*5.
*6.
*7.
*8.
*9.
*10.
*11.
*12.
*13.
*14.
*15.
*16.
*17.
SCIA7037E
TROUBLE DIAGNOSIS
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DIAGNOSTIC WORKSHEET
Information From Customer
KEY POINTS
●
WHAT. . Vehicle & A/T model
●
WHEN. . Date, Frequencies
●
WHERE. . Road conditions
●
HOW. . Operating conditions, Symptoms
Diagnostic Worksheet Chart
Customer name
MR/MS
Model & Year
VIN
Trans. Model
Engine
Mileage
Incident Date
Manuf. Date
In Service Date
Frequency
❏
Continuous
❏
Intermittent (
times a day)
Symptoms
❏
Vehicle does not move.
(
❏
Any position
❏
Particular position)
❏
No up-shift
(
❏
1st
→
2nd
❏
2nd
→
3rd
❏
3rd
→
4th
❏
4th
→
5th)
❏
No down-shift
(
❏
5th
→
4th
❏
4th
→
3rd
❏
3rd
→
2nd
❏
2nd
→
1st)
❏
Lock-up malfunction
❏
Shift point too high or too low.
❏
Shift shock or slip
(
❏
N
→
D
❏
N
→
R
❏
Lock-up
❏
Any drive position)
❏
Noise or vibration
❏
No kick down
❏
No pattern select
❏
Others
(
)
A/T CHECK indicator lamp
❏
Continuously lit
❏
Not lit
Malfunction indicator lamp (MIL)
❏
Continuously lit
❏
Not lit
1
❏
Read the item on cautions concerning fail-safe and understand the customer's complaint.
2
❏
ATF inspection
❏
Leak (Repair leak location.)
❏
State
❏
Amount
3
❏
Stall test and line pressure test
,
❏
Stall test
❏
Torque converter one-way clutch
❏
Front brake
❏
high and low reverse clutch
❏
Low coast brake
❏
Forward brake
❏
Reverse brake
❏
Forward one-way clutch
❏
1st one-way clutch
❏
3rd one-way clutch
❏
Engine
❏
Line pressure low
❏
Except for input clutch and direct
clutch, clutches and brakes OK
❏
Line pressure inspection - Suspected part:
AT-46
TROUBLE DIAGNOSIS
4
❏
Perform all road tests and enter checks in required inspection items.
4-1.
Check before engine is started
❏
AT-181, "A/T CHECK Indicator Lamp Does Not Come On"
❏
Perform self-diagnostics. Enter checks for detected items.
❏
AT-98, "DTC U1000 CAN COMMUNICATION LINE"
❏
AT-101, "DTC P0615 START SIGNAL CIRCUIT"
❏
❏
AT-106, "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏
AT-110, "DTC P0717 TURBINE REVOLUTION SENSOR"
❏
AT-112, "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)"
❏
AT-117, "DTC P0725 ENGINE SPEED SIGNAL"
❏
AT-119, "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
❏
AT-121, "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
❏
AT-123, "DTC P0745 LINE PRESSURE SOLENOID VALVE"
❏
AT-125, "DTC P1705 THROTTLE POSITION SENSOR"
❏
AT-128, "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
❏
AT-133, "DTC P1721 VEHICLE SPEED SENSOR MTR"
❏
AT-135, "DTC P1730 A/T INTERLOCK"
❏
AT-138, "DTC P1731 A/T 1ST ENGINE BRAKING"
❏
AT-140, "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
❏
AT-142, "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
❏
AT-144, "DTC P1757 FRONT BRAKE SOLENOID VALVE"
❏
AT-146, "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
❏
AT-148, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
❏
AT-150, "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
❏
AT-152, "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
❏
AT-154, "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
❏
AT-156, "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
❏
AT-158, "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
❏
AT-160, "DTC P1815 MANUAL MODE SWITCH"
❏
AT-164, "DTC P1841 ATF PRESSURE SWITCH 1"
❏
AT-166, "DTC P1843 ATF PRESSURE SWITCH 3"
❏
AT-168, "DTC P1845 ATF PRESSURE SWITCH 5"
❏
AT-170, "DTC P1846 ATF PRESSURE SWITCH 6"
4-2.
Check at idle
❏
AT-181, "Engine Cannot Be Started in “P” or “N” Position"
❏
AT-182, "In “P” Position, Vehicle Moves When Pushed"
❏
AT-183, "In “N” Position, Vehicle Moves"
❏
AT-184, "Large Shock (“N” to “D” Position)"
❏
AT-186, "Vehicle Does Not Creep Backward in “R” Position"
❏
AT-188, "Vehicle Does Not Creep Forward in “D” Position"
4-3.
Cruise tests
Part 1
❏
AT-190, "Vehicle Cannot Be Started From D
❏
AT-192, "A/T Does Not Shift: D
❏
AT-194, "A/T Does Not Shift: D
❏
AT-196, "A/T Does Not Shift: D
❏
AT-198, "A/T Does Not Shift: D
❏
AT-200, "A/T Does Not Perform Lock-up"
❏
AT-201, "A/T Does Not Hold Lock-up Condition"
❏
AT-203, "Lock-up Is Not Released"
❏
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