PRECAUTION REGARDING FAIL SAFE FUNCTIONS

TCM has the electrical fail safe mode. The mode functions so that the operation can be continued even if the signal circuit of the main electronically controlled input/output parts is damaged.
Even if the electronic circuit is normal, the fail safe mode may start under special conditions (such as when the brake pedal is depressed suddenly from a hard wheel spin status to stop rotation of wheels). In this case, turn the ignition switch OFF and back to ON after 5 seconds to resume the normal shift pattern.
Consequently, the customer's vehicle may already returns to normal condition. Refer to Work Flow (GT-R certified NISSAN dealer). Following are results of self-diagnosis.
 
 FAIL SAFE FUNCTION

If a malfunction occurs in either of the sensors or solenoids, this function controls the normal operation without downgrading the drivability.

DTC No.
The transmission operates under the fail safe mode
P0700*1
P0705
Release the clutches A and B if an error is detected. The driving force is not transmitted caused by this. The vehicle cannot be driven.
P0770
P0882
Driving gear
Fixed into the driving gear to get the vehicle driven, if an error occurs.
  • When the vehicle starts again after it is stopped, it becomes the following conditions.
Driving gear when the error occurs
Restart
1st gear
Possible to drive forward only
(fixed into 1st gear)
2nd gear
Only moving forward is possible
(fixed into 2nd gear)
3rd gear, 4th gear, 5th gear, 6th gear, Neutral, Not identified
Impossible
Reverse
Only moving rearward is possible
(fixed into Reverse gear)
Driving mode
  • The M range driving is prohibited. (During M range driving, the vehicle is forcibly shifted to the A range driving)
  • Selecting the set-up switch is prohibited. (If SNOW or R is selected, the vehicle is forcibly set to Normal)
Vehicle speed
The engine torque is restricted by the driving gear when the error occurs, and then the vehicle speed (maximum speed) is restricted.
Driving gear when the error occurs
Vehicle speed km/h (MPH)
1st gear, 2nd gear
46 (29)
3rd gear, 4th gear
85 (53)
5th gear, 6th gear
134 (84)
Reverse
46 (29)
Neutral
134 (84)
Not identified
46 (46)
P0700*2
P0715
P0729
P0732
P0745
P0746
P0750
P0755
P0795
P0797
P0840
Driving gear
  • Release the clutch A and prohibit the using of even gears (2nd gear, 4th gear, and 6th gear).
  • During driving, shift up or down to the next gear (odd gear) according to the driving conditions, and then shift the gear and drive the vehicle using the odd gears (1st gear, 3rd gear, 5th gear, and Reverse gear).
    • Shift to 5th gear after decelerating the vehicle speed to prevent over rev during driving at 6th gear.
Driving mode
  • The M range driving is prohibited. (During M range driving, the vehicle is forcibly shifted to the A range driving).
  • Selecting the set-up switch is prohibited. (If SNOW or R is selected, the vehicle is forcibly set to Normal).
Vehicle speed
The engine torque is restricted by the driving gear when the error occurs, and then the vehicle speed (maximum speed) is restricted.
Driving gear when the error occurs
Vehicle speed km/h (MPH)
2nd gear
46 (29)
4th gear
85 (53)
6th gear
134 (84)
Neutral
134 (84)
Not identified
46 (29)
P0700*2
P0731
P0733
P0760
P0765
P0775
P0776
P0845
P2713
P2714
P2765
Driving gear
  • Release the clutch B and prohibit the using of odd gears (1st gear, 3rd gear, 5th gear) and reverse gear.
  • During driving, shift up or down to the next gear (even gear) according to the driving conditions, and then shift the gear and drive the vehicle using the even gears (2nd gear, 4th gear, 6th gear).
    • Shift to the neutral conditions when the error is detected during driving at reverse gear.
    • Shift to 2nd gear when the error is detected during driving at 1st gear.
Driving mode
  • The M range driving is prohibited. (During M range driving, the vehicle is forcibly shifted to the A range driving.)
  • Selecting the set-up switch is prohibited. (If SNOW or R is selected, the vehicle is forcibly set to Normal.)
Vehicle speed
The engine torque is restricted by the driving gear when the error occurs, and then the vehicle speed (maximum speed) is restricted.
Driving gear when the error occurs
Vehicle speed km/h (MPH)
1st gear
46 (29)
3rd gear
85 (53)
5th gear
134 (84)
Reverse
46 (29)
Neutral
134 (84)
Unknown
46 (29)
P0700*3, *4
P0705
P1705
Driving gear
The use of all gears becomes possible.
Driving mode
  • The M range driving is prohibited. (During M range driving, the vehicle is forcibly shifted to the A range driving.)
  • Selecting the set-up switch is prohibited. (If SNOW or R is selected, the vehicle is forcibly set to Normal.)
Vehicle speed
Restrict or fix the engine torque and fix the throttle position according to the detected DTC.
DTC
Engine torque
Throttle position
P0700*3
Fixed
Approximately 1/8 fixed
P0700*4
Restricted
As per usual
P0705
Restricted
As per usual
P1705
Fixed
Approximately 1/8 fixed
  • *1: The fail safe mode operates if an error is detected in the TCM internal diagnosis.
  • *2: The fail safe mode operates if an error is detected in the sensor power supply voltage diagnosis.
  • *3: The fail safe mode operates if an engine torque error signal is detected.
  • *4: The fail safe mode operates if an engine speed error signal is detected.