Nissan Qashqai (2007-2010). Manual — part 589

TCM

TM-291

< ECU DIAGNOSIS >

[CVT: RE0F10A]

JCDWA0070GB

TM-292

< ECU DIAGNOSIS >

[CVT: RE0F10A]

TCM

Fail-safe

INFOID:0000000000988742

The TCM has an electrical fail-safe mode. In this mode TCM is operator even if there is an error in a main
electronic control input/output signal circuit.

FAIL-SAFE FUNCTION

If any malfunction occurs in a sensor or solenoid, this function controls the CVT to make driving possible.

Output Speed Sensor (Secondary Speed Sensor)

JCDWA0071GB

TCM

TM-293

< ECU DIAGNOSIS >

[CVT: RE0F10A]

The shift pattern is changed in accordance with throttle position when an unexpected signal is sent from the
output speed sensor (secondary speed sensor) to the TCM. The manual mode position is inhibited, and the
transaxle is put in “D”.

Input Speed Sensor (Primary Speed Sensor)

The shift pattern is changed in accordance with throttle position and secondary speed (vehicle speed) when
an unexpected signal is sent from the input speed sensor (primary speed sensor) to the TCM. The manual
mode position is inhibited, and the transaxle is put in “D”.

PNP Switch

If an unexpected signal is sent from the PNP switch to the TCM, the transaxle is put in “D”.

Manual Mode Switch

If an unexpected signal is sent from the manual mode switch to the TCM, the transaxle is put in “D”.

CVT Fluid Temperature Sensor

If an unexpected signal is sent from the CVT fluid temperature sensor to the TCM, the gear ratio in use before
receiving the unexpected signal is maintained or the gear ratio is controlled to keep engine speed under 5000
rpm.

Transmission Fluid Pressure Sensor A (Secondary Pressure Sensor)

• If an unexpected signal is sent from the transmission fluid pressure sensor A (secondary pressure sensor) to

the TCM, the secondary pressure feedback control is stopped and the offset value obtained before the non-
standard condition occurs is used to control line pressure.

• If transmission fluid pressure sensor A (secondary pressure sensor) error signal is input to TCM, secondary

pressure feedback control stops, but line pressure is controlled normally.

Pressure Control Solenoid A (Line Pressure Solenoid)

If an unexpected signal is sent from the solenoid to the TCM, the pressure control solenoid A (line pressure
solenoid) is turned OFF to achieve the maximum fluid pressure.

Pressure Control Solenoid B (Secondary Pressure Solenoid)

If an unexpected signal is sent from the solenoid to the TCM, the pressure control solenoid B (secondary pres-
sure solenoid) is turned OFF to achieve the maximum fluid pressure.

Torque Converter Clutch Solenoid

If an unexpected signal is sent from the solenoid to the TCM, the torque converter clutch solenoid is turned
OFF to cancel the lock-up.

Step Motor

If an unexpected signal is sent from the step motor to the TCM, the step motor coil phases “A” through “D” are
all turned OFF to hold the gear ratio used right before the non-standard condition occurred.

CVT Lock-up Select Solenoid

If an unexpected signal is sent from the solenoid to the TCM, the CVT lock-up select solenoid is turned OFF to
cancel the lock-up.

TCM Power Supply (Memory Back-up)

Transaxle assembly is protected by limiting the engine torque when the memory back-up power supply (for
controlling) from the battery is not supplied to TCM. Normal statues is restored when turning the ignition switch
OFF to ON after the normal power supply.

DTC Inspection Priority Chart

INFOID:0000000000988743

If some DTCs are displayed at the same time, perform inspections one by one based on the following priority
chart.
NOTE:
If DTC “U1000 CAN COMM CIRCUIT” is displayed with other DTCs, first perform the trouble diagnosis
for “DTC U1000 CAN COMMUNICATION LINE”. Refer to

TM-222

DTC Index

INFOID:0000000000988744

Priority

Detected items (DTC)

U1000 CAN communication line

Except above

TM-294

< ECU DIAGNOSIS >

[CVT: RE0F10A]

TCM

NOTE:
If DTC “U1000 CAN COMM CIRCUIT” is displayed with other DTCs, first perform the trouble diagnosis
for “DTC U1000 CAN COMMUNICATION LINE”. Refer to

TM-222

: These numbers are prescribed by ISO 15031-5.

DTC

Items

(CONSULT-III screen terms)

Reference page

OBD

Except OBD

CONSULT-III

GST

CONSULT-III only

“TRANSMISSION”