Nissan Versa Sedan. Manual - part 796

TM-90

< SYSTEM DESCRIPTION >

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ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Description

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This system is an on board diagnostic system that records exhaust emission-related diagnostic information

and detects a sensors/actuator-related malfunction. A malfunction is indicated by the malfunction indicator

lamp (MIL) and stored in ECU memory as a DTC. The diagnostic information can be obtained with the diag-

nostic tool (GST: Generic Scan Tool).

OBD FUNCTION

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When GST is connected with a data link connector equipped on the vehicle side, it will communicate with the

control unit equipped in the vehicle and then enable various kinds of diagnostic tests. Refer to 

TM-90,

"Description"

.

NOTE:

Service $0A is not applied for regions where it is not mandated.

DIAGNOSIS SYSTEM (TCM)

TM-91

< 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-109, "DTC Index"

.

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-93, "CONSULT Function"

.

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

to 

TM-120, "Work Flow"

.

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)"

.

DIAGNOSIS DESCRIPTION : Counter System

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RELATION BETWEEN DTC AT 1ST TRIP/DTC/MI 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 Pattern B” without malfunction.

• DTC is displayed until 40 trips of “Driving Pattern 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-109, "DTC Index"

)

—

—

×

—

×

—

2 trip detection diagnosis
(Refer to 

TM-109, "DTC Index"

)

×

—

—

×

—

×

TM-92

< SYSTEM DESCRIPTION >

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DIAGNOSIS SYSTEM (TCM)

• When the self-diagnosis result is acceptable at the 2nd trip (conforming to driving pattern B), DTC of the 1st

trip is erased.

COUNTER SYSTEM LIST

DRIVING CONDITION

Driving Pattern A

Driving pattern 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 reaches 400 rpm or more.

• Engine coolant temperature rises by 20

°C (36°F) or more after starting the engine.

• Engine coolant temperature reaches 70

°C (158°F) or more.

• The ignition switch is turned 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 Pattern B

Driving pattern 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 reaches 400 rpm or more.

• Engine coolant temperature reaches 70

°C (158°F) or more.

• Vehicle speed of 70 – 120 km/h (44 – 75 MPH) is maintained for 60 seconds or more under the control of

closed loop.

• Vehicle speed of 30 – 60 km/h (19 – 37 MPH) is maintained for 10 seconds or more under the control of

closed loop.

• Under the closed loop control condition, the following state reaches 12 seconds or more in total: Vehicle

speed of 4 km/h (2 MPH) or less with idling condition.

• A lapse of 22 minutes or more after engine start.

• The state of driving at 10km/h (6 MPH) or more reaches 10 minutes 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 pattern

Trip

MIL (OFF)

B

3

DTC (clear)

A

40

DTC at 1st trip (clear)

B

1

DIAGNOSIS SYSTEM (TCM)

TM-93

< SYSTEM DESCRIPTION >

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TIME CHART

CONSULT Function

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APPLICATION ITEMS

JSDIA1868GB

Diagnostic test mode

Function

Work Support

This mode enables a technician to adjust some devices faster and more accurately.

Self Diagnostic Results

Retrieve DTC from ECU and display diagnostic items.

Data Monitor

Monitor the input/output signal of the control unit in real time.

CAN Diagnosis

This mode displays a network diagnosis result about CAN by a diagram.