Nissan Pathfinder (2007 year). Instruction — part 9
TROUBLE DIAGNOSIS
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2007 Pathfinder
TROUBLE DIAGNOSIS
PFP:00004
DTC Inspection Priority Chart
ECS00EF1
If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC U1000 is displayed with other DTCs, first perform the trouble diagnosis for DTC U1000. Refer to
Fail-Safe
ECS00EF2
The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is an error in a
main electronic control input/output signal circuit. In fail-safe mode the transmission is fixed in 2nd, 4th or 5th
(depending on the breakdown position), so the customer should feel “slipping” or “poor acceleration”.
Even when the electronic circuits are normal, under special conditions (for example, when slamming on the
brake with the wheels spinning drastically and stopping the tire rotation), the transmission can go into fail-safe
mode. If this happens, switch “OFF” the ignition switch for 10 seconds, then switch it “ON” again to return to
the normal shift pattern. Therefore, the customer's vehicle has returned to normal, so handle according to the
“diagnostics flow” (Refer to
FAIL-SAFE FUNCTION
If any malfunction occurs in a sensor or solenoid, this function controls the A/T to mark driving possible.
Vehicle Speed Sensor
●
Signals are input from two systems - from vehicle speed sensor A/T (revolution sensor) installed on the
transmission and from combination meter so normal driving is possible even if there is a malfunction in
one of the systems. And if vehicle speed sensor A/T (revolution sensor) has unusual cases, 5th gear is
prohibited.
Accelerator Pedal Position Sensor
●
If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM accord-
ing to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow
systems, the engine speed is fixed by ECM to a pre-determined engine speed to make driving possible.
Throttle Position Sensor
●
If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM accord-
ing to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow
systems, the accelerator opening angle is controlled by the idle signal sent from the ECM which is based
on input indicating either idle condition or off-idle condition (pre-determined accelerator opening) in order
to make driving possible.
PNP Switch
●
In the unlikely event that a malfunction signal enters the TCM, the position indicator is switched “OFF”, the
starter relay is switched “OFF” (starter starting is disabled), the back-up lamp relay switched “OFF” (back-
up lamp is OFF) and the position is fixed to the “D” range to make driving possible.
Starter Relay
●
The starter relay is switched “OFF”. (Starter starting is disabled.)
Priority
Detected items (DTC)
1
U1000 CAN communication line
2
Except above
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TROUBLE DIAGNOSIS
2007 Pathfinder
A/T Interlock
●
If there is an A/T interlock judgment malfunction, the transmission is fixed in 2nd gear to make driving pos-
sible.
NOTE:
When the vehicle is driven fixed in 2nd gear, a turbine revolution sensor malfunction is displayed,
but this is not a turbine revolution sensor malfunction.
●
When the coupling pattern below is detected, the fail-safe action corresponding to the pattern is per-
formed.
A/T INTERLOCK COUPLING PATTERN TABLE
●
: NG X: OK
A/T 1st Engine Braking
●
When there is an A/T first gear engine brake judgment malfunction, the low coast brake solenoid is
switched “OFF” to avoid the engine brake operation.
Line Pressure Solenoid
●
The solenoid is switched “OFF” and the line pressure is set to the maximum hydraulic pressure to make
driving possible.
Torque Converter Clutch Solenoid
●
The solenoid is switched “OFF” to release the lock-up.
Low Coast Brake Solenoid
●
When a (electrical or functional) malfunction occurs, in order to make driving possible, the engine brake is
not applied in 1st and 2nd gear.
Input Clutch Solenoid
●
If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is
held in 4th gear to make driving possible.
Direct Clutch Solenoid
●
If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is
held in 4th gear to make driving possible.
Front Brake Solenoid
●
If a (electrical or functional) malfunction occurs with the solenoid “ON”, in order to make driving possible,
the A/T is held in 5th gear; if the solenoid is OFF, 4th gear.
High and Low Reverse Clutch Solenoid
●
If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is
held in 4th gear to make driving possible.
Turbine Revolution Sensor 1 or 2
●
The control is the same as if there were no turbine revolution sensors, 5th gear is prohibited.
Gear position
ATF pressure switch output
Fail-safe
function
Clutch pressure output pattern after fail-safe func-
tion
SW3
(I/C)
SW6
(HLR/
C)
SW5
(D/C)
SW1
(FR/B)
SW2
(LC/B)
I/C
HLR/C
D/C
FR/B
LC/B
L/U
A/T inter-
lock cou-
pling pattern
3rd
–
X
X
–
●
Held in
2nd gear
OFF
OFF
ON
OFF
OFF
OFF
4th
–
X
X
–
●
Held in
2nd gear
OFF
OFF
ON
OFF
OFF
OFF
5th
X
X
–
X
●
Held in
2nd gear
OFF
OFF
ON
OFF
OFF
OFF
TROUBLE DIAGNOSIS
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2007 Pathfinder
How To Perform Trouble Diagnosis For Quick and Accurate Repair
ECS00EF3
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
2007 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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2007 Pathfinder
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
2007 Pathfinder
4
❏
Perform all road tests and enter checks in required inspection items.
4-1.
Check before engine is started
❏
AT-177, "O/D OFF Indicator Lamp Does Not Come On"
❏
Perform self-diagnostics Enter checks for detected items.
❏
AT-97, "DTC U1000 CAN COMMUNICATION LINE"
❏
AT-100, "DTC P0615 START SIGNAL CIRCUIT"
❏
❏
AT-105, "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏
AT-109, "DTC P0717 TURBINE REVOLUTION SENSOR"
❏
AT-111, "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)"
❏
AT-116, "DTC P0725 ENGINE SPEED SIGNAL"
❏
AT-118, "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
❏
AT-120, "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
❏
AT-122, "DTC P0745 LINE PRESSURE SOLENOID VALVE"
❏
AT-124, "DTC P1705 THROTTLE POSITION SENSOR"
❏
AT-127, "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
❏
AT-132, "DTC P1721 VEHICLE SPEED SENSOR MTR"
❏
AT-134, "DTC P1730 A/T INTERLOCK"
❏
AT-137, "DTC P1731 A/T 1ST ENGINE BRAKING"
❏
AT-139, "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
❏
AT-141, "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
❏
AT-143, "DTC P1757 FRONT BRAKE SOLENOID VALVE"
❏
AT-145, "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
❏
AT-147, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
❏
AT-149, "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
❏
AT-151, "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
❏
AT-153, "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
❏
AT-155, "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
❏
AT-157, "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
❏
AT-159, "DTC P1841 ATF PRESSURE SWITCH 1"
❏
AT-161, "DTC P1843 ATF PRESSURE SWITCH 3"
❏
AT-163, "DTC P1845 ATF PRESSURE SWITCH 5"
❏
AT-165, "DTC P1846 ATF PRESSURE SWITCH 6"
4-2.
Idle inspection
❏
AT-178, "Engine Cannot Be Started In “P” or “N” Position"
❏
AT-179, "In “P” Position, Vehicle Moves When Pushed"
❏
AT-180, "In “N” Position, Vehicle Moves"
❏
AT-181, "Large Shock (“N” to “D” Position)"
❏
AT-183, "Vehicle Does Not Creep Backward In “R” Position"
❏
AT-186, "Vehicle Does Not Creep Forward In “D” Position"
4-3.
Driving tests
Part 1
❏
AT-188, "Vehicle Cannot Be Started From D
❏
AT-190, "A/T Does Not Shift: 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 Perform Lock-up"
❏
AT-200, "A/T Does Not Hold Lock-up Condition"
❏
AT-202, "Lock-up Is Not Released"
❏
TROUBLE DIAGNOSIS
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2007 Pathfinder
4
4-3
Part 2
❏
AT-188, "Vehicle Cannot Be Started From D
❏
AT-190, "A/T Does Not Shift: D
❏
AT-192, "A/T Does Not Shift: D
❏
AT-194, "A/T Does Not Shift: D
Part 3
❏
AT-205, "A/T Does Not Shift: 5th gear
❏
AT-207, "A/T Does Not Shift: 4th gear
❏
AT-209, "A/T Does Not Shift: 3rd gear
❏
AT-211, "A/T Does Not Shift: 2nd gear
❏
AT-213, "Vehicle Does Not Decelerate By Engine Brake"
❏
Perform self-diagnostics Enter checks for detected items.
❏
AT-97, "DTC U1000 CAN COMMUNICATION LINE"
❏
AT-100, "DTC P0615 START SIGNAL CIRCUIT"
❏
❏
AT-105, "DTC P0705 PARK/NEUTRAL POSITION SWITCH"
❏
AT-109, "DTC P0717 TURBINE REVOLUTION SENSOR"
❏
AT-111, "DTC P0720 VEHICLE SPEED SENSOR A/T (REVOLUTION SENSOR)"
❏
AT-116, "DTC P0725 ENGINE SPEED SIGNAL"
❏
AT-118, "DTC P0740 TORQUE CONVERTER CLUTCH SOLENOID VALVE"
❏
AT-120, "DTC P0744 A/T TCC S/V FUNCTION (LOCK-UP)"
❏
AT-122, "DTC P0745 LINE PRESSURE SOLENOID VALVE"
❏
AT-124, "DTC P1705 THROTTLE POSITION SENSOR"
❏
AT-127, "DTC P1710 A/T FLUID TEMPERATURE SENSOR CIRCUIT"
❏
AT-132, "DTC P1721 VEHICLE SPEED SENSOR MTR"
❏
AT-134, "DTC P1730 A/T INTERLOCK"
❏
AT-137, "DTC P1731 A/T 1ST ENGINE BRAKING"
❏
AT-139, "DTC P1752 INPUT CLUTCH SOLENOID VALVE"
❏
AT-141, "DTC P1754 INPUT CLUTCH SOLENOID VALVE FUNCTION"
❏
AT-143, "DTC P1757 FRONT BRAKE SOLENOID VALVE"
❏
AT-145, "DTC P1759 FRONT BRAKE SOLENOID VALVE FUNCTION"
❏
AT-147, "DTC P1762 DIRECT CLUTCH SOLENOID VALVE"
❏
AT-149, "DTC P1764 DIRECT CLUTCH SOLENOID VALVE FUNCTION"
❏
AT-151, "DTC P1767 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE"
❏
AT-153, "DTC P1769 HIGH AND LOW REVERSE CLUTCH SOLENOID VALVE
❏
AT-155, "DTC P1772 LOW COAST BRAKE SOLENOID VALVE"
❏
AT-157, "DTC P1774 LOW COAST BRAKE SOLENOID VALVE FUNCTION"
❏
AT-159, "DTC P1841 ATF PRESSURE SWITCH 1"
❏
AT-161, "DTC P1843 ATF PRESSURE SWITCH 3"
❏
AT-163, "DTC P1845 ATF PRESSURE SWITCH 5"
❏
AT-165, "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.
AT-50
TROUBLE DIAGNOSIS
2007 Pathfinder
A/T Electrical Parts Location
ECS00EF4
SCIA6251E
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