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Nissan Frontier D40. Manual - part 1083

TM-230

< ECU DIAGNOSIS >

[5AT: RE5R05A]

TCM

ABDIA0409GB

TCM

TM-231

< ECU DIAGNOSIS >

[5AT: RE5R05A]

Fail-Safe

INFOID:0000000005274159

The TCM has an electrical fail-safe mode. This mode makes it possible to operate even if there is an error in a
main electronic control input/output signal circuit. In fail-safe mode the transmission is fixed in 2GR, 4GR or
5GR (depending on the breakdown position), so the customer should feel “slipping” or “poor acceleration”.
Even when the electronic circuits are normal, under special conditions (for example, when slamming on the
brake with the wheels spinning drastically and stopping the tire rotation), the transmission can go into fail-safe
mode. If this happens, switch “OFF” the ignition switch for 10 seconds, then switch it “ON” again to return to

ABDIA0410GB

TM-232

< ECU DIAGNOSIS >

[5AT: RE5R05A]

TCM

the normal shift pattern. Therefore, the customer's vehicle has returned to normal, so handle according to the
“diagnostics flow” (Refer to

TM-125, "Diagnostic Work Sheet"

FAIL-SAFE FUNCTION

If any malfunction occurs in a sensor or solenoid, this function controls the A/T to mark driving possible.

Output Speed Sensor

• Signals are input from two systems - from output speed sensor installed on the transmission and from com-

bination meter so normal driving is possible even if there is a malfunction in one of the systems. And if output
speed has unusual cases, 5GR is prohibited.

Accelerator Pedal Position Sensor

• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according

to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the engine speed is fixed by ECM to a pre-determined engine speed to make driving possible.

Throttle Position Sensor

• If there is a malfunction in one of the systems, the accelerator opening angle is controlled by ECM according

to a pre-determined accelerator angle to make driving possible. And if there are malfunctions in tow sys-
tems, the accelerator opening angle is controlled by the idle signal sent from the ECM which is based on
input indicating either idle condition or off-idle condition (pre-determined accelerator opening) in order to
make driving possible.

Transmission Range Switch

• In the unlikely event that a malfunction signal enters the TCM, the position indicator is switched “OFF”, the

starter relay is switched “OFF” (starter starting is disabled), the back-up lamp relay switched “OFF” (back-up
lamp is OFF) and the position is fixed to the “D” range to make driving possible.

Starter Relay

• The starter relay is switched “OFF”. (Starter starting is disabled.)

Interlock

• If there is an interlock judgment malfunction, the transmission is fixed in 2GR to make driving possible.

NOTE:
When the vehicle is driven fixed in 2GR, a input speed sensor malfunction is displayed, but this is
not a input speed sensor malfunction.

• When interlock is detected at the 3GR or more, it is locked at the 2GR.

1st Engine Braking

• When there is an 1st engine brake judgment malfunction, the low coast brake solenoid is switched “OFF” to

avoid the engine brake operation.

Line Pressure Solenoid

• The solenoid is switched “OFF” and the line pressure is set to the maximum hydraulic pressure to make driv-

ing possible.

Torque Converter Clutch Solenoid

• The solenoid is switched “OFF” to release the lock-up.

Low Coast Brake Solenoid

• When a (electrical or functional) malfunction occurs, in order to make driving possible, the engine brake is

not applied in 1GR and 2GR.

Input Clutch Solenoid

• If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is

held in 4GR to make driving possible.

Direct Clutch Solenoid

• If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is

held in 4GR to make driving possible.

Front Brake Solenoid

• If a (electrical or functional) malfunction occurs with the solenoid “ON”, in order to make driving possible, the

A/T is held in 5GR; if the solenoid is OFF, 4GR.

High and Low Reverse Clutch Solenoid

• If a (electrical or functional) malfunction occurs with the solenoid either “ON” or “OFF”, the transmission is

held in 4GR to make driving possible.

TCM

TM-233

< ECU DIAGNOSIS >

[5AT: RE5R05A]

Input Speed Sensor 1 or 2

• The control is the same as if there were no input speed sensors, 5GR is prohibited.

DTC Inspection Priority Chart

INFOID:0000000005274160

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

TM-159

DTC No. Index

INFOID:0000000005274161

NOTE:
If DTC U1000 is displayed with other DTC, first perform the trouble diagnosis for DTC U1000. Refer to

TM-159

Priority

Detected items (DTC)

U1000 CANCOMM CIRCUIT

Except above

DTC

Items

(CONSULT- III screen terms)