Nissan Versa (N17): TCM

Reference Value

VALUES ON DIAGNOSIS TOOL

• The CONSULT electrically displays shift timing and lock-up timing (that is, operation timing of each solenoid) Check for time difference between actual shift timing and the CONSULT display. If the difference is noticeable, mechanical parts (except solenoids, sensors, etc.) may be malfunctioning. Check mechanical parts in accordance with the specified diagnostic procedures.
• Shift schedule (that implies gear position) on CONSULT may slightly differ from that described in Service Manual. This occurs for the following reasons:

• Actual shift schedule has more or less tolerance or allowance
• Shift schedule in Service Manual refers to the point where shifting starts
• Gear position on CONSULT indicates the point where shifting completes

• Display of solenoid valves on CONSULT changes at the start of shifting, while gear position is displayed upon completion of shifting (which is computed by TCM).

NOTE: The following table includes information (items) inapplicable to this vehicle. For information (items) applicable to this vehicle, refer to CONSULT display items.

 

TERMINAL LAYOUT

INPUT/OUTPUT SIGNAL STANDARD

Fail-Safe

TCM is equipped with an electrical fail-safe mode. The operation can be continued even if the signal circuit of the main electronically controlled input/output parts are damaged.

If the vehicle shows following behaviors including "poor acceleration", a malfunction of the applicable system is detected by TCM and the vehicle may be in a fail-safe mode. At this time, check the DTC code and perform inspection and repair according to the malfunction diagnosis procedures.

FAIL-SAFE FUNCTION

Protection Control

The TCM becomes the protection control status temporarily to protect the safety when the safety of TCM and transmission is lost. It automatically returns to the normal status if the safety is secured.

The TCM is equipped with the following protection control.

REVERSE INHIBIT CONTROL

Intercepts the torque transmission and shifts to the neutral status if the selector lever is shifted to "R" position while the vehicle moves forward at the vehicle speed 10 km/h (7 MPH) or more.

Operation detection conditions	Vehicle speed: 10 km/h (7 MPH) or more (when driving forward) Selector lever is shifted to "R" position.
Control when activated	Neutral
Recovery condition	Vehicle speed: 7 km/h (4 MPH) or less and Engine speed: 2,800 rpm or less
Vehicle behavior	The torque transmission cannot be performed There is a shock just before a vehicle stop

TCM HIGH TEMPERATURE PROTECTION CONTROL

When the ATF becomes hot, the shifting pattern is changed for preventing fluid temperature rise.

Operation detection conditions	ATF temp.: 125C (257F) or more
Control when activated	Change the shift pattern so that higher upshift may be achieved.
Recovery condition	ATF temp.: 119C (246F) or less
Vehicle behavior	Upshifts at a higher vehicle speed than usual.

TORQUE-DOWN CONTROL WHEN CONTINUOUS STALL OCCURS IN D POSITION

If the accelerator pedal is continually depressed for a certain length of time when the selector lever is in the "D" position and the vehicle is parked, the engine output is limited for protecting the transaxle

Operation detection conditions	The following conditions continue for 20 seconds or more Selector lever is in the "D" position or "R" position and the vehicle is stopped and Engine speed: 2,300 - 2,850 rpm
Control when activated	Limits engine output
Recovery condition	Selector lever is shifted to a position other than "D" or "R" or The accelerator pedal is released
Vehicle behavior	Decreased starting performance Engine speed hunching when the accelerator pedal is depressed

O/D PROHIBIT CONTROL AT LOW TEMPERATURES

When the ATF temperature is low immediately after engine start, shifting to 4GR is prohibited for protecting the transaxle and allowing the exhaust gas characteristics to warm up quickly.

Operation detection conditions	ATF temp.: 0C (32F) or less or ATF temp.: less than 40C (104F) (when IGN is ON) Vehicle speed: 65 km/h (40 MPH) or less 3GR
Control when activated	4GR prohibited
Recovery condition	Less than 130 seconds following IGN ON ATF temp.: 40C (104F) or more or Vehicle speed: 65 km/h (40 MPH) or higher After 130 seconds following IGN ON ATF temp.: 0C (32F) or more
Vehicle behavior	Shifts up only as far as 3GR.

DTC Inspection Priority Chart

If some DTCs are displayed at the same time, perform inspections one by one based on the priority as per the following list.

DTC Index

NOTE:

• If some DTCs are displayed at the same time, perform inspections one by one based on the priority as per the following list. Refer to TM, "DTC Inspection Priority Chart".
• The IGN counter is indicated in Freeze frame data (FFD). Refer to TM, "CONSULT Function".

×: Applicable -: Not Applicable

*1: These numbers are prescribed by SAE J2012/ISO 15031-6.

*2: The items are the same as those of 1st trip freeze frame data.

A/T CONTROL SYSTEM

Wiring Diagram

A/T SHIFT LOCK SYSTEM

Wiring Diagram