Nissan Pathfinder (2005 year). Instruction — part 9
TROUBLE DIAGNOSIS
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2005 Pathfinder
How To Perform Trouble Diagnosis For Quick and Accurate Repair
UCS0031T
INTRODUCTION
The TCM receives a signal from the vehicle speed sensor, accelerator 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
) should be used.
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
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TROUBLE DIAGNOSIS
2005 Pathfinder
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, “Information From Customer” (Refer to
) and “Diagnostic
Worksheet” (Refer to
), 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.
WCIA0251E
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
Malfunction 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
❏
Lock-up
❏
Any drive position)
❏
Noise or vibration
❏
No kick down
❏
No pattern select
❏
Others
(
)
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:
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TROUBLE DIAGNOSIS
2005 Pathfinder
4
❏
Perform all road tests and enter checks in required inspection items.
4-1.
Check before engine is started
❏
AT-183, "O/D OFF Indicator Lamp Does Not Come On"
❏
Perform self-diagnostics Enter checks for detected items.
❏
AT-100, "DTC U1000 CAN COMMUNICATION LINE"
❏
AT-103, "DTC P0615 START SIGNAL CIRCUIT"
❏
❏
AT-108, "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏
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 P1702 TRANSMISSION CONTROL MODULE (RAM)"
❏
AT-126, "DTC P1703 TRANSMISSION CONTROL MODULE (ROM)"
❏
AT-127, "DTC P1705 THROTTLE POSITION SENSOR"
❏
AT-130, "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
❏
AT-135, "DTC P1716 TURBINE REVOLUTION SENSOR"
❏
AT-137, "DTC P1721 VEHICLE SPEED SENSOR MTR"
❏
AT-139, "DTC P1730 A/T INTERLOCK"
❏
AT-142, "DTC P1731 A/T 1ST ENGINE BRAKING"
❏
AT-144, "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
❏
AT-146, "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
❏
AT-148, "DTC P1757 FRONT BRAKE SOLENOID VALVE"
❏
AT-150, "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
❏
AT-152, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
❏
AT-154, "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
❏
AT-156, "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
❏
AT-158, "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
❏
AT-160, "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
❏
AT-162, "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
❏
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.
Idle inspection
❏
AT-184, "Engine Cannot Be Started In “P” or “N” Position"
❏
AT-185, "In “P” Position, Vehicle Moves When Pushed"
❏
AT-186, "In “N” Position, Vehicle Moves"
❏
AT-187, "Large Shock (“N” to “D” Position)"
❏
AT-189, "Vehicle Does Not Creep Backward In “R” Position"
❏
AT-192, "Vehicle Does Not Creep Forward In “D” Position"
4-3.
Driving tests
Part 1
❏
AT-194, "Vehicle Cannot Be Started From D
❏
AT-196, "A/T Does Not Shift: D
❏
AT-198, "A/T Does Not Shift: D
❏
AT-200, "A/T Does Not Shift: D
❏
AT-202, "A/T Does Not Shift: D
❏
AT-204, "A/T Does Not Perform Lock-up"
❏
AT-206, "A/T Does Not Hold Lock-up Condition"
❏
AT-208, "Lock-up Is Not Released"
❏
TROUBLE DIAGNOSIS
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4
4-3
Part 2
❏
AT-194, "Vehicle Cannot Be Started From D
❏
AT-196, "A/T Does Not Shift: D
❏
AT-198, "A/T Does Not Shift: D
❏
AT-200, "A/T Does Not Shift: D
Part 3
❏
AT-211, "A/T Does Not Shift: 5th gear
❏
AT-213, "A/T Does Not Shift: 4th gear
❏
AT-215, "A/T Does Not Shift: 3rd gear
❏
AT-217, "A/T Does Not Shift: 2nd gear
❏
AT-219, "Vehicle Does Not Decelerate By Engine Brake"
❏
Perform self-diagnostics Enter checks for detected items.
❏
AT-100, "DTC U1000 CAN COMMUNICATION LINE"
❏
AT-103, "DTC P0615 START SIGNAL CIRCUIT"
❏
❏
AT-108, "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏
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 P1702 TRANSMISSION CONTROL MODULE (RAM)"
❏
AT-126, "DTC P1703 TRANSMISSION CONTROL MODULE (ROM)"
❏
AT-127, "DTC P1705 THROTTLE POSITION SENSOR"
❏
AT-130, "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
❏
AT-135, "DTC P1716 TURBINE REVOLUTION SENSOR"
❏
AT-137, "DTC P1721 VEHICLE SPEED SENSOR MTR"
❏
AT-139, "DTC P1730 A/T INTERLOCK"
❏
AT-142, "DTC P1731 A/T 1ST ENGINE BRAKING"
❏
AT-144, "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
❏
AT-146, "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
❏
AT-148, "DTC P1757 FRONT BRAKE SOLENOID VALVE"
❏
AT-150, "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
❏
AT-152, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
❏
AT-154, "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
❏
AT-156, "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
❏
AT-158, "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
❏
AT-160, "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
❏
AT-162, "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
❏
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"
5
❏
Inspect each system for items found to be NG in the self-diagnostics and repair or replace the malfunction parts.
6
❏
Perform all road tests and enter the checks again for the required items.
7
❏
For any remaining NG items, perform the “diagnostics procedure” and repair or replace the malfunction parts.
See the chart for diagnostics by symptoms. (This chart also contains other symptoms and inspection proce-
dures.)
8
❏
Erase the results of the self-diagnostics from the TCM.
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TROUBLE DIAGNOSIS
2005 Pathfinder
A/T Electrical Parts Location
UCS0031U
SCIA6251E
TROUBLE DIAGNOSIS
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2005 Pathfinder
Circuit Diagram
UCS0031V
BCWA0414E
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TROUBLE DIAGNOSIS
2005 Pathfinder
Inspections Before Trouble Diagnosis
UCS0031X
A/T FLUID CHECK
Fluid Leakage and Fluid Level Check
●
Inspect for fluid leakage and check the fluid level. Refer to
MA-24, "Changing the Automatic Transmission
.
Fluid Condition Check
Inspect the fluid condition.
STALL TEST
Stall Test Procedure
1.
Inspect the amount of engine oil. Replenish the engine oil if necessary.
2.
Drive for about 10 minutes to warm up the vehicle so that the A/
T fluid temperature is 50 to 80
°
C (122 to 176
°
F). Inspect the
amount of ATF. Replenish if necessary.
3.
Securely engage the parking brake so that the tires do not turn.
4.
Engine start, apply foot brake, and place selector lever in “D”
position.
5.
While holding down the foot brake, gradually press down the
accelerator pedal.
6.
Quickly read off the stall speed, then quickly remove your foot
from the accelerator pedal.
CAUTION:
Do not hold down the accelerator pedal for more than 5 sec-
onds during this test.
Fluid condition
Conceivable Cause
Required Operation
Varnished (viscous
varnish state)
Clutch, brake
scorched
Replace the ATF and check the A/T
main unit and the vehicle for mal-
functions (wire harnesses, cooler
pipes, etc.)
Milky white or
cloudy
Water in the fluid
Replace the ATF and check for
places where water is getting in.
Large amount of
metal powder mixed
in
Unusual wear of
sliding parts within
A/T
Replace the ATF and check for
improper operation of the A/T.
SAT638A
SAT647B
SCIA1224E
Stall speed:
2,200 - 2,500 rpm
SAT514G
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