Nissan Frontier D40. Instruction — part 1068
TM-170
< COMPONENT DIAGNOSIS >
[5AT: RE5R05A]
P0725 ENGINE SPEED
P0725 ENGINE SPEED
Description
INFOID:0000000005274032
The engine speed signal is sent from the ECM to the TCM.
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000005274033
On Board Diagnosis Logic
INFOID:0000000005274034
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0725” with CONSULT-III or 16th judgment flicker without CONSULT-III is detected
when TCM does not receive the ignition signal from ECM during engine cranking or running.
Possible Cause
INFOID:0000000005274035
Harness or connectors
(The ECM to the TCM circuit is open or shorted.)
DTC Confirmation Procedure
INFOID:0000000005274036
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1.
Turn ignition switch “ON” and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
2.
Start engine and maintain the following conditions for at least 10 consecutive seconds.
VHCL/S SE-A/T: 10 km/h (6 MPH) or more
ACCELE POSI: More than 1/8
SLCT LVR POSI: “D” position
3.
If DTC is detected, go to
.
Diagnosis Procedure
INFOID:0000000005274037
1.
CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to
TM-151, "CONSULT-III Function (TRANSMISSION)"
Is a malfunction in the CAN communication indicated in the results?
YES
>> Check CAN communication line. Refer to
.
NO
>> GO TO 2.
2.
CHECK DTC WITH TCM
With CONSULT-III
1.
Start engine.
2.
Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3.
While monitoring engine speed, check for engine speed change corresponding to wide-open throttle posi-
tion signal.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>>
Check the ignition signal circuit.
• Refer to
(QR25DE) or
(VQ40DE).
Item name
Condition
Display value (rpm)
ENGINE SPEED
Engine running
Closely matches the tachometer reading.
P0725 ENGINE SPEED
TM-171
< COMPONENT DIAGNOSIS >
[5AT: RE5R05A]
C
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3.
CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to
TM-170, "DTC Confirmation Procedure"
.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 4.
4.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair or replace damaged parts.
5.
DETECT MALFUNCTIONING ITEM
Check the following.
• The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
Is the inspection result normal?
YES
>> Replace the control valve with TCM. Refer to
TM-280, "Removal and Installation"
NO
>> Repair or replace damaged parts.
TM-172
< COMPONENT DIAGNOSIS >
[5AT: RE5R05A]
P0731 1GR INCORRECT RATIO
P0731 1GR INCORRECT RATIO
Description
INFOID:0000000005274038
This malfunction is detected when the A/T does not shift into 1GR position as instructed by TCM. This is not
only caused by electrical malfunction (circuits open or shorted) but mechanical malfunction such as control
valve sticking, improper solenoid valve operation.
On Board Diagnosis Logic
INFOID:0000000005274039
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0731” with CONSULT-III or 18th judgment flicker without CONSULT-III is detected
when TCM detects any inconsistency in the actual gear ratio.
Possible Cause
INFOID:0000000005274040
• Input clutch solenoid valve
• Front brake solenoid valve
• Direct clutch solenoid valve
• High and low reverse clutch solenoid valve
• Each clutch
• Hydraulic control circuit
DTC Confirmation Procedure
INFOID:0000000005274041
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1.
Start the engine and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
2.
Make sure that “ATF TEMP 1” is within the following range.
ATF TEMP 1: 20
°
C – 180
°
C
If out of range, drive vehicle to warm ATF or stop engine to cool ATF.
3.
Select “1ST GR FNCTN P0731” of “DTC & SRT CONFIRMATION” mode for “TRANSMISSION” with
CONSULT-III.
4.
Drive vehicle and maintain the following conditions.
SLCT LVR POSI: “1” position
GEAR: “1” position
ACCELE POSI: 0.6/8 or more
VEHICLE SPEED: 10 km/h (6 MPH) or more
ENGINE SPEED: INPUT SPEED
−
50 rpm or more
INPUT SPEED: 300 rpm or more
5.
Keep the current driving status for at least 5 consecutive seconds if CONSULT-III screen changes from
“OUT OF CONDITION” to “TESTING”.
CAUTION:
If “TESTING” does not appear on CONSULT-III for a long time, select “SELF-DIAG RESULTS”. In
case a 1st trip DTC other than P0731 is shown, refer to
TM-151, "CONSULT-III Function (TRANS-
If “COMPLETED RESULT NG” is detected, go to
.
If “STOP VEHICLE” is detected, go to the following step.
6.
Stop vehicle.
7.
Drive vehicle in “D” position allowing it to shift from 1GR to 5GR and check shift timing and shift shock.
-
Touch “OK” to complete the inspection when normally shifted from the 1GR to 5GR.
-
Touch “NG” when an unusual shift shock, etc. occurs in spite of shifting from the 1GR to 5GR. Go to
271, "Check Before Engine Is Started"
.
-
Perform
TM-151, "CONSULT-III Function (TRANSMISSION)"
when not shifted from the 1GR to 5GR.
(Neither “OK” nor “NG” are indicated.)
WITH GST
P0731 1GR INCORRECT RATIO
TM-173
< COMPONENT DIAGNOSIS >
[5AT: RE5R05A]
C
E
F
G
H
I
J
K
L
M
A
B
TM
N
O
P
1.
Start the engine.
2.
Drive vehicle for approximately 5 minutes in urban areas.
3.
Drive vehicle and maintain the following conditions for at least 5 consecutive seconds.
Selector lever: “1” position
Gear position: “1” position
Accelerator opening: 0.6/8 or more
Vehicle speed: 10 km/h (6 MPH) or more
4.
Check DTC.
5.
If DTC is detected, go to
.
Diagnosis Procedure
INFOID:0000000005274042
1.
CHECK CAN COMMUNICATION LINE
Perform self-diagnosis. Refer to
TM-151, "CONSULT-III Function (TRANSMISSION)"
,
Procedure without CONSULT-III"
Is a malfunction in the CAN communication indicated in the results?
YES
>> Check CAN communication line. Refer to
NO
>> GO TO 2.
2.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTION ITEM
Check A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.
4.
REPLACE CONTROL VALVE WITH TCM
1.
Replace control valve with TCM. Refer to
TM-280, "Removal and Installation"
.
2.
TM-172, "DTC Confirmation Procedure"
.
OK or NG
OK
>> INSPECTION END
NG
>> Confirm malfunction phenomena by “ROAD TEST” to repair malfunctioning part. Refer to
"Check Before Engine Is Started"
.
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