2003 NISSAN X-TRAIL Electronic Repair Manual

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Page 153 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0725 ENGINE SPEED SIGNAL
AT-147
[EURO-OBD]
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DTC P0725 ENGINE SPEED SIGNALPFP:24825
DescriptionECS0 04 R7
The engine speed signal is sent from the ECM to the TCM.
TCM TERM

Page 154 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual AT-148
[EURO-OBD]
DTC P0725 ENGINE SPEED SIGNAL
Wiring Diagram — AT — ENGSS
ECS004R8
TCWA0045E

Page 155 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0725 ENGINE SPEED SIGNAL
AT-149
[EURO-OBD]
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Diagnostic ProcedureECS0 04 R9
1.CHECK DTC WITH ECM
Perform diagnostic test mode II (self- diagnostic results) for engine cont

Page 156 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual AT-150
[EURO-OBD]
DTC P0725 ENGINE SPEED SIGNAL
4.CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure,AT-147, "
DTC P0725 ENGINE SPEED SIG-
NAL".
OK or NG
OK >>INSPECTION END
NG >>

Page 157 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0731 A/T 1ST GEAR FUNCTION
AT-151
[EURO-OBD]
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DTC P0731 A/T 1ST GEAR FUNCTIONPFP:31940
DescriptionECS004RA
lThis is an OBD-II self-diagnostic item and not available in TC

DTC P0731 A/T 1ST GEAR FUNCTION
AT-151
[EURO-OBD]
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DTC P0731 A/T 1ST GEAR FUNCTIONPFP:31940
DescriptionECS004RA
lThis is an OBD-II self-diagnostic item and not available in TCM self-diagnosis.
lThis malfunction will not be detected while the O/D OFF indicator lamp is indicating another self-diagnosis
malfunction.
lThis malfunction is detected when the A/T does not shift into first gear position as instructed by the TCM.
This is not caused by electrical malfunction (circuits open or shorted) but by mechanical malfunction such
as control valve sticking, improper solenoid valve operation, etc.
TCM TERMINALS AND REFERENCE VALUE
Remarks: Specification data are reference values.
ON BOARD DIAGNOSTIC LOGIC
This diagnosis monitors actual gear position by checking the torque converter slip ratio calculated by TCM as
follows:
Torque converter slip ratio = A x C/B
A: Output shaft revolution signal from revolution sensor
B: Engine speed signal from ECM
C: Gear ratio determined as gear position which TCM supposes
If the actual gear position is higher than the position (1st) supposed by TCM, the slip ratio will be more than
normal. In case the ratio exceeds the specified value, TCM judges this diagnosis malfunction.
This malfunction will be caused when either shift solenoid valve A is stuck open or shift solenoid valve B is
stuck open.
*: P0731 is detected.Gear position 1 2 3 4
Shift solenoid valve A ON (Closed) OFF (Open) OFF (Open) ON (Closed)
Shift solenoid valve B ON (Closed) ON (Closed) OFF (Open) OFF (Open)
Te r m i -
nal No.Wire color Item ConditionJudgement stan-
dard
(Approx.)
11 L / WShift solenoid
valve AWhen shift solenoid valve A oper-
ates.
(When driving in “D
1”or“D4”.)Battery voltage
When shift solenoid valve A does not
operate.
(When driving in “D
2”or“D3”.)0V
12 L/YShift solenoid
valve BWhen shift solenoid valve B oper-
ates.
(When driving in “D
1”or“D2”.)Battery voltage
When shift solenoid valve B does not
operate.
(When driving in “D
3”or“D4”.)0V
GearpositionsupposedbyTCM 1234
Incaseofgearpositionwithnomalfunctions 1234
In case of gear position with shift solenoid valve A stuck open 2* 2 3 3
In case of gear position with shift solenoid valve B stuck open 4* 3 3 4
Diagnostic trouble code Malfunction is detected when ... Check items (Possible cause)
:A/T1STGRFNCTN
A/T cannot be shifted to the 1st gear posi-
tion even if electrical circuit is good.
lShift solenoid valve A
lShift solenoid valve B
lEach clutch
lHydraulic control circuit : P0731

Page 158 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual AT-152
[EURO-OBD]
DTC P0731 A/T 1ST GEAR FUNCTION
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
CAUTION:
lAlways drive vehicle at a safe speed.
lBe careful not to rev engine into the red zone o

AT-152
[EURO-OBD]
DTC P0731 A/T 1ST GEAR FUNCTION
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
CAUTION:
lAlways drive vehicle at a safe speed.
lBe careful not to rev engine into the red zone on the tachometer.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE” has been previously conducted,
always turn ignition switch “OFF” and wait at least 5 seconds before conducting the next test.
TESTING CONDITION:
Always drive vehicle on a level road to improve the accuracy of test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
With CONSULT-II
1. Start engine and select “DATA MONITOR” mode for “A/T” with CONSULT-II.
2. Make sure that output voltage of A/T fluid temperature sensor is within the range below.
FLUID TEMP SEN : 0.4 - 1.5V
If out of range, drive the vehicle to decrease the voltage (warm up the fluid) or stop engine to increase the
voltage (cool down the fluid).
3. Select “1ST GR FNCTN P0731” of “DTC WORK SUPPORT”
mode for “A/T” with CONSULT-II and touch “START”.
4. Accelerate vehicle to 15 to 20 km/h (9 to 12 MPH) under the fol-
lowing condition and release the accelerator pedal completely.
THROTTLE POSI: Less than 1.0/8 (at all times during step 4)
Selector lever: D position (OD “ON”)
lCheck that “GEAR” shows “2” after releasing pedal.
5. Depress accelerator pedal to WOT (more than 7.0/8 of “THROT-
TLE POSI”) quickly from a speed of 15 to 20 km/h (9 to 12 MPH)
until “TESTING” changes to “STOP VEHICLE” or “COM-
PLETED”. (It will take approximately 3 seconds.)
If the check result NG appears on CONSULT-II screen, go to
“DIAGNOSTIC PROCEDURE”,AT-155, "
Diagnostic Procedure".
If “STOP VEHICLE” appears on CONSULT-II screen, go to the following step.
lCheck that “GEAR” shows “1” when depressing accelerator pedal to WOT.
lIf “TESTING” does not appear on CONSULT-II for a long time, select “SELF-DIAGNOSIS” for
“ENGINE”. In case a 1st trip DTC other than P0731 is shown, refer to applicable “TROUBLE DIAG-
NOSIS FOR DTC”.
SAT014K
SAT971J
SAT021J

Page 159 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual DTC P0731 A/T 1ST GEAR FUNCTION
AT-153
[EURO-OBD]
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6. Stop vehicle.
7. Follow the instruction displayed. (Check for normal shifting referring to the table below.)
8. Make sure

Page 160 of 3066

NISSAN X-TRAIL 2003 Electronic Repair Manual AT-154
[EURO-OBD]
DTC P0731 A/T 1ST GEAR FUNCTION
Wiring Diagram — AT — 1ST
ECS004RB
TCWA0049E

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