Nissan Frontier D40. Manual - 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 

TM-170, "Diagnosis Procedure"

.

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 

TM-159

.

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 

EC-382, "Diagnosis Procedure"

 (QR25DE) or 

EC-866, "Diagnosis Procedure"

(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 

TM-210, "Diagnosis Procedure"

.

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-

MISSION)"

.

If “COMPLETED RESULT NG” is detected, go to 

TM-173, "Diagnosis Procedure"

.

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 

TM-

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]

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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 

TM-173, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005274042

1.

CHECK CAN COMMUNICATION LINE

Perform self-diagnosis. Refer to 

TM-151, "CONSULT-III Function (TRANSMISSION)"

, 

TM-156, "Diagnosis

Procedure without CONSULT-III"

.

Is a malfunction in the CAN communication indicated in the results?

YES

>> Check CAN communication line. Refer to 

TM-159, "Diagnosis Procedure"

.

NO

>> GO TO 2.

2.

CHECK TCM POWER SUPPLY AND GROUND CIRCUIT

Check TCM power supply and ground circuit. Refer to 

TM-210, "Diagnosis Procedure"

.

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.

Perform 

TM-172, "DTC Confirmation Procedure"

.

OK or NG

OK

>> INSPECTION END

NG

>> Confirm malfunction phenomena by “ROAD TEST” to repair malfunctioning part. Refer to 

TM-271,

"Check Before Engine Is Started"

.