DTC DETECTION LOGIC

DTC | Self-diagnosis name | DTC detection condition | Possible cause
P2837 | Shift fork "B" position circuit range/performance | A DTC is set if the status of the sleeve A2 position of less than 1.8 mm (0.071in) is detected for a certain period of time when the sleeve A2 position target is on the 2nd gear side. |

- 2nd-4th position sensor
- Shift solenoid valve 1
- Shift solenoid valve 2
- Sequence solenoid valve
- Harness or connector
  (Open or short in the 2nd-4th position sensor circuit)
  (Open or short in the shift solenoid valve 1 circuit)
  (Open or short in the shift solenoid valve 2 circuit)
  (Open or short in the sequence solenoid valve circuit)

A DTC is set if the status of the sleeve A2 position of more than −1.8 mm (−0.071 in) is detected for a certain period of time when the sleeve A2 position target is on the 4th gear side.
A DTC is set if the sleeve A1 and A2 positions are not in 2nd gear during driving in the 2nd gear. |

- Shift solenoid valve 1
- Shift solenoid valve 2
- Sleeve A2 related part
- Harness or connector
  (Open or short in the shift solenoid valve 1 circuit)
  (Open or short in the shift solenoid valve 2 circuit)

A DTC is set if the sleeve A1 and A2 positions are not in 4th gear during driving in the 4th gear.
A DTC is set if the sleeve A2 position is 7.0 mm (0.276 in) or less and 1.7 mm (0.067 in) or more when the sleeve A2 position target is on the 2nd gear side. |

- Shift solenoid valve 1
- Shift solenoid valve 2
- Axis A feed pressure solenoid valve
- Sleeve A2 related part
- Harness or connector
  (Open or short in the shift solenoid valve 1 circuit)
  (Open or short in the shift solenoid valve 2 circuit)
  (Open or short in the axis A feed pressure solenoid valve circuit)

A DTC is set if the sleeve A2 position is −1.7 mm (−0.067 in) or less and −7.1 mm (−0.28 in) or more when the sleeve A2 position target is on the 4th gear side.
A DTC is set if the following statuses 1 and 2 are detected.

1. The difference between the clutch A speed calculated from the output shaft speed sensor value and clutch A speed sensor value is 1,000 rpm or more.
2. The difference between the clutch A speed calculated from the vehicle speed signal (meter) (CAN signal) and clutch A speed sensor value is 1,000 rpm or more.

- Clutch A speed sensor
- Sleeve A2 related part
- Harness or connector
  (Open or short in the clutch A speed sensor circuit)

DTC CONFIRMATION PROCEDURE
■ CAUTION ■

- If CONSULT-III is not available, “Diagnosis Procedure (GT-R certified NISSAN dealer)” must be performed before starting “DTC CONFIRMATION PROCEDURE”.
- If CONSULT-III is not available, never perform “DTC CONFIRMATION PROCEDURE” before completing the repair, which may cause secondary malfunction.
- Be careful of the driving speed.

1.PREPARATION BEFORE OPERATION (PART 1)
If another “DTC CONFIRMATION PROCEDURE” is performed just before the next test, turn the ignition switch OFF and wait for 10 seconds or more, then perform the next test.
>>GO TO 2.
2.PREPARATION BEFORE OPERATION (PART 2)
With CONSULT-III

1. Turn the ignition switch ON.
2. Select “FLUID TEMP” in “Data Monitor”.

Is the oil temperature −20°C (−4°F) or more?
YES>>GO TO 3.
NO>>Warm up the transmission.
3.PREPARATION BEFORE OPERATION (PART 3)
With CONSULT-III
Select “READ CLUTCH GEAR LEARNING DATA” in “Work support”.
Is the “2-4 learning experienced” YES?
YES>>GO TO 4.
NO>>Perform “CLUTCH GEAR LEARNING”.
4.CONFIRMATION BEFORE OPERATION (PART 1)
With CONSULT-III
Select “SLEEVE A2 POSI” in “Data Monitor”.
Is the numeral value of the “SLEEVE A2 POSI” in the range between −1.8 and 1.8 mm (−0.071 and 0.071 in)?
YES>>GO TO 5.
NO>>GO TO 7.
5.CONFIRMATION BEFORE OPERATION (PART 2)
With CONSULT-III

1. Shift the shift lever to the N position.
2. Start the engine.
3. Select “GEAR POSITION TEST” in “Work support”.
4. Select “GEAR2”.
   ■ CAUTION ■
   Never select “GEAR6” or “GEAR N”.

Does the sleeve A2 operate?
YES>>GO TO 6.
NO>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
6.CONFIRMATION BEFORE OPERATION (PART 3)
With CONSULT-III

1. Select “GEAR POSITION TEST” in “Work support”.
2. Select “GEAR4”.
   ■ CAUTION ■
   Never select “GEAR6” or “GEAR N”.

Does the sleeve A2 operate?
YES>>GO TO 8.
NO>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
7.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III

1. Shift the shift lever to the P position and run at idle for 1 minute or more.
2. Check “Self Diagnostic Result” of “TRANSMISSION”.

Without CONSULT-III

1. Shift the shift lever to the P position and run at idle for 1 minute or more.
2. Check self-diagnosis.

Is DTC P0797 or DTC P0798 detected?
YES-1 (DTC P0797 is detected)>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
YES-2 (DTC P0798 is detected)>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
NO>>GO TO 8.
8.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III

1. Select “RANGE”, “GEAR” and “VEHICLE SPEED” in “Data Monitor”.
2. Run the vehicle and maintain the following conditions for 10 second.

   RANGE | : M
   GEAR | : 1
   ENGINE SPEED | : 40 km/h (25 MPH) or more

3. Check “Self Diagnostic Result” of “TRANSMISSION”.

Without CONSULT-III

1. Run the vehicle and maintain the following conditions for 10 second.

   Shift lever | : M range
   Gear | : 1
   Engine speed | : 40 km/h (25 MPH) or more

2. Check self-diagnosis.

Is DTC P2837 detected?
YES>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
NO>>GO TO 9.
9.PERFORM DTC CONFIRMATION PROCEDURE — DTC DETECTION CONDITION H AND I
With CONSULT-III

1. Select “RANGE”, “GEAR”, “ENGINE SPEED” and “VEHICLE SPEED” in “Data Monitor”.
2. Run the vehicle and maintain the following conditions for 10 seconds or more.

   RANGE | : M
   GEAR | : 2
   ENGINE SPEED | : 3,000 rpm or more
   VEHICLE SPEED | : 40 km/h (25 MPH) or more

3. Check “Self Diagnostic Result” of “TRANSMISSION”.

Without CONSULT-III

1. Run the vehicle and maintain the following conditions for 10 seconds or more.

   Shift lever | : M range
   Gear | : 2
   Engine speed | : 3,000 rpm or more
   Vehicle speed | : 40 km/h (25 MPH) or more

2. Check self-diagnosis.

Is DTC P2837 detected?
YES>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
NO>>GO TO 10.
10.PERFORM DTC CONFIRMATION PROCEDURE — DTC DETECTION CONDITION D AND G
With CONSULT-III

1. Select “RANGE”, “GEAR”, and “VEHICLE SPEED” in “Data Monitor”.
2. Run the vehicle and maintain the following conditions for 10 seconds or more.

   RANGE | : M
   GEAR | : 3
   VEHICLE SPEED | : 40 km/h (25 MPH) or more

3. Check “Self Diagnostic Result” of “TRANSMISSION”.

Without CONSULT-III

1. Run the vehicle and maintain the following conditions for 10 seconds or more.

   Shift lever | : M range
   Gear | : 3
   Vehicle speed | : 40 km/h (25 MPH) or more

2. Check self-diagnosis.

Is DTC P2837 detected?
YES>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
NO>>GO TO 11.
11.PERFORM DTC CONFIRMATION PROCEDURE — DTC DETECTION CONDITION J
With CONSULT-III

1. Select “RANGE”, “GEAR” and “VEHICLE SPEED” in “Data Monitor”.
2. Run the vehicle and maintain the following conditions for 10 seconds or more.

   RANGE | : M
   GEAR | : 4
   VEHICLE SPEED | : 40 km/h (25 MPH) or more

3. Check “Self Diagnostic Result” of “TRANSMISSION”.

Without CONSULT-III

1. Run the vehicle and maintain the following conditions for 10 seconds or more.

   Shift lever | : M range
   Gear | : 4
   Vehicle speed | : 40 km/h (25 MPH) or more

2. Check self-diagnosis.

Is DTC P2837 detected?
YES>>Go to Diagnosis Procedure (GT-R certified NISSAN dealer).
NO>>Go to Intermittent Incident.