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Nissan Pathfinder (2008 year). Manual - part 597

TM-118

< ECU DIAGNOSIS >

TCM

ALDIA0075GB

TCM

TM-119

< ECU DIAGNOSIS >

ALDIA0076GB

TM-120

< ECU DIAGNOSIS >

TCM

ALDIA0077GB

TCM

TM-121

< ECU DIAGNOSIS >

Fail-Safe

INFOID:0000000001282744

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 2nd, 4th or 5th
(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

ALDIA0128GB

TM-122

< ECU DIAGNOSIS >

TCM

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

TM-7, "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.

Vehicle Speed Sensor

• Signals are input from two systems - from vehicle speed sensor A/T (revolution sensor) installed on the

transmission and from combination meter so normal driving is possible even if there is a malfunction in one
of the systems. And if vehicle speed sensor A/T (revolution sensor) has unusual cases, 5th gear is prohib-
ited.

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.

PNP 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.)

A/T Interlock

• If there is an A/T interlock judgment malfunction, the transmission is fixed in 2nd gear to make driving possi-

ble.
NOTE:
When the vehicle is driven fixed in 2nd gear, a turbine revolution sensor malfunction is displayed,
but this is not a turbine revolution sensor malfunction.

• When the coupling pattern below is detected, the fail-safe action corresponding to the pattern is performed.

A/T INTERLOCK COUPLING PATTERN TABLE

●

: NG X: OK

A/T 1st Engine Braking

• When there is an A/T first gear 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.

Gear position

ATF pressure switch output

Fail-safe

function

Clutch pressure output pattern after fail-safe func-

tion

SW3

(I/C)

SW6

(HLR/

SW5

(D/C)

SW1

(FR/B)

SW2

(LC/B)

I/C

HLR/C

D/C

FR/B

LC/B

L/U

A/T interlock
coupling pat-
tern

3rd

–

●

Held in

2nd gear

OFF

4th

–

●

Held in

2nd gear

OFF

5th

–

●

Held in

2nd gear

OFF

TCM

TM-123

< ECU DIAGNOSIS >

Low Coast Brake Solenoid

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

not applied in 1st and 2nd gear.

Input Clutch Solenoid

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

held in 4th gear 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 4th gear 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 5th gear; if the solenoid is OFF, 4th gear.

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 4th gear to make driving possible.

Turbine Revolution Sensor 1 or 2

• The control is the same as if there were no turbine revolution sensors, 5th gear is prohibited.

DTC Inspection Priority Chart

INFOID:0000000001282743

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-45

DTC No. Index

INFOID:0000000001282718

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

TM-45

Priority

Detected items (DTC)

U1000 CAN communication line

Except above

DTC

Items

(CONSULT- III screen terms)

Reference page

OBD- II

Except OBD- II

CONSULT- III

GST (*1)

CONSULT- III

only “A/T”

—

P0615

STARTER RELAY/CIRC

TM-46

P0700

TCM

TM-49

P0705

PNP SW/CIRC

TM-50

P0710

P1710

ATF TEMP SEN/CIRC

TM-77

P0717

TURBINE REV S/CIRC

TM-52

P0720

VEH SPD SEN/CIR AT

TM-54

—

P0725

ENGINE SPEED SIG

TM-57

P0731

A/T 1ST GR FNCTN

TM-69

P0732

A/T 2ND GR FNCTN

TM-69

P0733

A/T 3RD GR FNCTN

TM-69

P0734

A/T 4TH GR FNCTN

TM-69

P0735

A/T 5TH GR FNCTN

TM-69

P0740

TCC SOLENOID/CIRC

TM-69

TM-124

< ECU DIAGNOSIS >

TCM

*1: These numbers are prescribed by SAE J2012.

*2: These malfunctions cannot be displayed MIL if another malfunction is assigned to MIL.

*3: With manual mode.

Alphabetical Index

INFOID:0000000001282717

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

TM-45

P0744 (*2)

P0744

A/T TCC S/V FNCTN

TM-71

P0745

L/PRESS SOL/CIRC

TM-73

—

P1705

TP SEN/CIRC A/T

TM-75

—

P1721

VEH SPD SE/CIR·MTR

TM-80

P1730

A/T INTERLOCK

TM-82

—

P1731

A/T 1ST E/BRAKING

TM-84

P1752

I/C SOLENOID/CIRC

TM-86

P1757

FR/B SOLENOID/CIRC

TM-88

P1762

D/C SOLENOID/CIRC

TM-90

P1767

HLR/C SOL/CIRC

TM-92

P1772

LC/B SOLENOID/CIRC

TM-94

P1774 (*2)

P1774

LC/B SOLENOID FNCT

TM-96

—

P1815

MANU MODE SW/CIR (*3)·

TM-80

U1000

CAN COMM CIRCUIT

TM-45

DTC

Items

(CONSULT- III screen terms)

Reference page

OBD- II

Except OBD- II

CONSULT- III

GST (*1)

CONSULT- III

only “A/T”

Items

(CONSULT- III screen terms)

DTC

Reference page

OBD- II

Except OBD- II

CONSULT- III GST (*1)

CONSULT- III only “A/T”

A/T 1ST E/BRAKING

—

P1731

TM-84

A/T 1ST GR FNCTN

P0731

TM-59

A/T 2ND GR FNCTN

P0732

TM-61

A/T 3RD GR FNCTN

P0733

TM-63

A/T 4TH GR FNCTN

P0734

TM-65

A/T 5TH GR FNCTN

P0735

TM-67

A/T INTERLOCK

P1730

TM-82

A/T TCC S/V FNCTN

P0744 (*2)

P0744

TM-71

ATF TEMP SEN/CIRC

P0710

P1710

TM-77

CAN COMM CIRCUIT

U1000

TM-45

D/C SOLENOID/CIRC

P1762

TM-90

ENGINE SPEED SIG

—

P0725

TM-57

FR/B SOLENOID/CIRC

P1757

TM-88

HLR/C SOL/CIRC

P1767

TM-92

I/C SOLENOID/CIRC

P1752

TM-86

L/PRESS SOL/CIRC

P0745

TM-73

LC/B SOLENOID/CIRC

P1772

TM-94

TCM

TM-125

< ECU DIAGNOSIS >

*1: These numbers are prescribed by SAE J2012.

*2: These malfunctions cannot be displayed MIL if another malfunction is assigned to MIL.

*3: With manual mode.

LC/B SOLENOID FNCT

P1774 (*2)

P1774

TM-96

MANU MODE SW/CIR (*3)

—

P1815

TM-94

PNP SW/CIRC

P0705

TM-50

STARTER RELAY/CIRC

—

P0615

TM-46

TCC SOLENOID/CIRC

P0740

TM-69

TCM

P0700

TM-49

TP SEN/CIRC A/T

—

P1705

TM-75

TURBINE REV S/CIRC

P0717

TM-52

VEH SPD SE/CIR·MTR

—

P1721

TM-80

VEH SPD SEN/CIR AT

P0720

TM-54

Items

(CONSULT- III screen terms)

DTC

Reference page

OBD- II

Except OBD- II

CONSULT- III GST (*1)

CONSULT- III only “A/T”

Content .. 595 596 597 598 ..