Nissan Pathfinder. Manual - part 1145

SYSTEM

TM-39

< SYSTEM DESCRIPTION >

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LOCK-UP CONTROL : System Description

INFOID:0000000009177513

SYSTEM DIAGRAM

DESCRIPTION

• Controls for improvement of the transmission efficiency by engaging the torque converter clutch in the

torque converter and eliminating slip of the converter. Achieves comfortable driving with slip control of the

torque converter clutch. 

• The oil pressure feed circuit for the torque converter clutch piston chamber is connected to the torque con-

verter clutch control valve. The torque converter clutch control valve is switched by the torque converter

clutch solenoid valve with the signal from TCM. This controls the oil pressure circuit, which is supplied to the

torque converter clutch piston chamber, to the release side or engagement side. 

• If the CVT fluid temperature is low or the vehicle is in fail-safe mode due to malfunction, lock-up control is

prohibited. 

Lock-up engagement 

In lock-up engagement, the torque converter clutch solenoid valve makes the torque converter clutch control

valve locked up to generate the lock-up apply pressure. This pushes the torque converter clutch piston for

engagement. 

Lock-up release condition 

In lock-up release, the torque converter clutch solenoid valve makes the torque converter clutch control valve

non-locked up to drain the lock-up apply pressure. This does not engage the torque converter clutch piston. 

JSDIA4010GB

TM-40

< SYSTEM DESCRIPTION >

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ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Description

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This is an on board diagnosis system which records diagnosis information related to the exhaust gases. It

detects malfunctions related to sensors and actuators. The malfunctions are indicated by means of the mal-

function indicator lamp (MIL) and are stored as DTC in the ECU memory. The diagnosis information can be

checked using a diagnosis tool (GST: Generic Scan Tool).

Function of OBD

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The GST is connected to the diagnosis connector on the vehicle and communicates with the on-board control

units to perform diagnosis. The diagnosis connector is the same as for CONSULT. Refer to 

GI-57, "Descrip-

tion"

.

DIAGNOSIS SYSTEM (TCM)

TM-41

< SYSTEM DESCRIPTION >

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DIAGNOSIS SYSTEM (TCM)

DIAGNOSIS DESCRIPTION
DIAGNOSIS DESCRIPTION : 1 Trip Detection Diagnosis and 2 Trip Detection Diagno-
sis

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NOTE:

“Start the engine and turn OFF the ignition switch after warm-up.” This is defined as 1 trip.

1 TRIP DETECTION DIAGNOSIS

When initial malfunction is detected, TCM memorizes DTC. In these diagnoses, some illuminate MIL and

some do not. Refer to 

TM-60, "DTC Index"

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2 TRIP DETECTION DIAGNOSIS

When initial malfunction is detected, TCM memorizes DTC of the 1st trip. MIL does not light at this stage. <1

trip>

If the same malfunction is detected again in next driving, TCM memorizes DTC. When DTC is memorized, MIL

lights. <2 trip>

“Trip” of the “2 trip detection diagnosis” indicates the driving mode that executes self-diagnosis during driving.

×: Check possible —: Check not possible

DIAGNOSIS DESCRIPTION : DTC and DTC of 1st Trip

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2 TRIP DETECTION DIAGNOSIS THAT ILLUMINATES MIL

• The DTC number of the 1st trip is the same as the DTC number.

• When a malfunction is detected at the 1st trip, TCM memorizes DTC of the 1st trip. MIL does not light at this

stage. If the same malfunction is not detected at the 2nd trip (conforming to necessary driving conditions),

DTC at the 1st trip is erased from TCM. If the same malfunction is detected at the 2nd trip, TCM memorizes

DTC and MIL lights at the same time.

• The DTC of the 1st trip is specified in Service $01 of SAE J1979/ISO 15031-5. Since detection of DTC at the

1st trip does not illuminate MIL, warning for a problem is not given to a driver.

• For procedure to delete DTC and 1st trip DTC from TCM, refer to 

TM-43, "CONSULT Function"

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• If DTC of the 1st trip is detected, it is necessary to check the cause according to the “Diagnosis flow”. Refer

to 

TM-78, "Work Flow"

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DIAGNOSIS DESCRIPTION : Malfunction Indicator Lamp (MIL)

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• TCM not only detects DTC, but also sends the MIL signal to ECM through CAN communication. ECM sends

the MIL signal to the combination meter through CAN communication according to the signal, and illumi-

nates MIL.

• For malfunction indicator lamp (MIL) description, refer to 

EC-26, "Malfunction Indicator Lamp (MIL)"

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DIAGNOSIS DESCRIPTION : Counter System

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RELATION BETWEEN DTC AT 1ST TRIP/DTC/MIL AND DRIVING CONDITIONS (FOR 2 TRIP DE-
TECTION DIAGNOSIS THAT ILLUMINATES MIL)

• When initial malfunction is detected, TCM memorizes DTC of the 1st trip. MIL does not light at this stage.

• If the same malfunction is detected at the 2nd trip, TCM memorizes DTC and MIL lights at the same time.

• Then, MIL goes after driving the vehicle for 3 trips under “Driving condition B” without malfunction.

• DTC is displayed until 40 trips of “Driving condition A” are satisfied without detecting the same malfunction.

DTC is erased when 40 trips are satisfied.

Item

DTC at the 1st trip

DTC

MIL

Display at the 

1st trip

Display at the 

2nd trip

Display at the 

1st trip

Display at the 

2nd trip

Illumination at 

the 1st trip

Illumination at 

the 2nd trip

1 trip detection diagnosis
(Refer to 

TM-60, "DTC Index"

)

—

—

×

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×

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2 trip detection diagnosis
(Refer to 

TM-60, "DTC Index"

)

×

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×

—

×

TM-42

< SYSTEM DESCRIPTION >

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DIAGNOSIS SYSTEM (TCM)

• When the self-diagnosis result is acceptable at the 2nd trip (conforming to driving condition B), DTC of the

1st trip is erased.

COUNTER SYSTEM LIST

DRIVING CONDITION

Driving condition A

Driving condition A is the driving condition that provides warm-up.

In specific, count-up is performed when all of the following conditions are satisfied.

• Engine speed is 400 rpm or more.

• After start of the engine, the water temperature increased by 20

°C (36°F) or more.

• Water temperature was 70

°C (158°F) or more.

• The ignition switch was changed from ON to OFF.

NOTE:

• If the same malfunction is detected regardless of the driving condition, reset the A counter.

• When the above is satisfied without detecting the same malfunction, count up the A counter.

• When MIL goes off due to the malfunction and the A counter reaches 40, the DTC is erased.

Driving condition B

Driving condition B is the driving condition that performs all diagnoses once.

In specific, count-up is performed when all of the following conditions are satisfied.

• Engine speed is 400 rpm or more.

• Water temperature was 70

°C (158°F) or more.

• In closed loop control, vehicle speed of 70 – 120 km/h (43 – 75 MPH) continued for 60 seconds or more.

• In closed loop control, vehicle speed of 30 – 60 km/h (19 – 37 MPH) continued for 10 seconds or more.

• In closed loop control, vehicle speed of 4 km/h (2 MPH) or less and idle determination ON continued for 12

seconds or more.

• After start of the engine, 22 minutes or more have passed.

• The condition that the vehicle speed is 10 km/h (6 MPH) or more continued for 10 seconds or more in total.

• The ignition switch was changed from ON to OFF.

NOTE:

• If the same malfunction is detected regardless of the driving condition, reset the B counter.

• When the above is satisfied without detecting the same malfunction, count up the B counter.

• When the B counter reaches 3 without malfunction, MIL goes off.

• When the B counter is counted once without detecting the same malfunction after TCM memorizes DTC of

the 1st trip, DTC of the 1st trip is erased.

Item

Driving condition

Trip

MIL (OFF)

B

3

DTC (clear)

A

40

DTC at 1st trip (clear)

B

1