Nissan Maxima. Manual - part 1143

TM-36

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[CVT: RE0F09B]

ON BOARD DIAGNOSTIC (OBD) SYSTEM

ON BOARD DIAGNOSTIC (OBD) SYSTEM

Diagnosis Description

INFOID:0000000010113452

DESCRIPTION

The CVT system has two self-diagnostic systems.

The first is the emission-related on board diagnostic system (OBD-II) performed by the TCM in combination

with the ECM. A malfunction is indicated by the MIL (Malfunction Indicator Lamp) and is stored as a DTC in

the ECM memory and in the TCM memory.

The second is the TCM original self-diagnosis performed by the TCM. A malfunction history is stored in the

TCM memory. The detected items are overlapped with OBD-II self-diagnostic items. For details, refer to 

TM-

124, "DTC Index"

.

OBD-II FUNCTION

The ECM provides emission-related on board diagnostic (OBD-II) functions for the CVT system. One function

is to receive a signal from the TCM used with OBD-related parts of the CVT system. The signal is sent to the

ECM when a malfunction occurs in the corresponding OBD-related part. The other function is to indicate a

diagnostic result by means of the MIL (Malfunction Indicator Lamp) on the instrument panel. Sensors,

switches and solenoid valves are used as sensing elements.

The MIL automatically illuminates in “One or Two Trip Detection Logic” when a malfunction is sensed in rela-

tion to CVT system parts.

ONE OR TWO TRIP DETECTION LOGIC OF OBD-II

One Trip Detection Logic

If a malfunction is sensed during the first test drive, the MIL illuminates and the ECM memory stores the mal-

function as a DTC. The TCM is not provided with such a memory function.

Two Trip Detection Logic

When a malfunction is sensed during the first test drive, it is stored in the ECM memory as a 1st trip DTC

(diagnostic trouble code) or 1st trip freeze frame data. At this point, the MIL does not illuminate. — 1st trip

If the same malfunction as that experienced during the first test drive is sensed during the second test drive,

the MIL will illuminate. — 2nd trip

The “trip” in the “One or Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed

during vehicle operation.

OBD-II DIAGNOSTIC TROUBLE CODE (DTC)

How to Read DTC and 1st Trip DTC

DTC and 1st trip DTC can be read by the following methods.
(  with CONSULT or   GST) CONSULT or GST (Generic Scan Tool) Examples: P0705, P0720, etc.

These DTC are prescribed by SAE J2012.

(CONSULT also displays the malfunctioning component or system.)

• 1st trip DTC No. is the same as DTC No.

• Output of the diagnostic trouble code indicates that the indicated circuit has a malfunction. How-

ever, in case of the Mode II and GST, they do not indicate whether the malfunction is still occurring or

it occurred in the past and has returned to normal.

CONSULT can identify them as shown below, therefore, CONSULT (if available) is recommended.

- DTC or 1st trip DTC of a malfunction is displayed in SELF-DIAGNOSTIC RESULTS mode for “ENGINE” with

CONSULT. Time data indicates how many times the vehicle was driven after the last detection of a DTC.

- If the DTC is being detected currently, the time data will be “0”.

- If a 1st trip DTC is stored in the ECM, the time data will be “1t”.

Freeze Frame Data and 1st Trip Freeze Frame Data

• The ECM has a memory function, which stores the driving conditions such as fuel system status, calculated

load value, engine coolant temperature, short-term fuel trim, long-term fuel trim, engine speed and vehicle

speed at the moment the ECM detects a malfunction.

Data that are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data,

and the data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT

or GST. The 1st trip freeze frame data can only be displayed on the CONSULT screen, not on the GST.

Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the

ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no priority

for 1st trip freeze frame data, and it is updated each time a different 1st trip DTC is detected. However, once

ON BOARD DIAGNOSTIC (OBD) SYSTEM

TM-37

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freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no

longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-

lowing priorities to update the data.

Both 1st trip freeze frame data and freeze frame data (along with the DTC) are cleared when the ECM mem-

ory is erased.

How to Erase DTC

• The diagnostic trouble code can be erased by CONSULT, GST or ECM DIAGNOSTIC TEST MODE as

described below.

- If the battery cable is disconnected, the diagnostic trouble code will be lost within 24 hours.

- When erasing the DTC, using CONSULT or GST is easier and quicker than switching the mode selec-

tor on the ECM.

• The following emission-related diagnostic information is cleared from the ECM memory when erasing DTC

related to OBD-II. For details, refer to 

EC-542, "DTC Index"

.

- Diagnostic trouble codes (DTC)

- 1st trip diagnostic trouble codes (1st trip DTC)

- Freeze frame data

- 1st trip freeze frame data

- System readiness test (SRT) codes

- Test values

How to Erase DTC (With CONSULT)

The emission related diagnostic information in the TCM and ECM can be erased by selecting “ALL Erase” in

the “Description” of “FINAL CHECK” mode with CONSULT.

How to Erase DTC (With GST)

1. If the ignition switch stays ON after repair work, be sure to turn ignition switch OFF once. Wait at least 10

seconds and then turn it ON (engine stopped) again.

2. Select Mode 4 with GST (Generic Scan Tool).

MALFUNCTION INDICATOR LAMP (MIL)

Description

The MIL is located on the instrument panel.
1. The MIL is turned ON when the ignition switch is turned ON

without the engine running. This is a bulb check.

• If the MIL is not turned ON, refer to 

EC-507, "Component

Function Check"

.

2. Turn OFF the MIL when the engine is started.

If the MIL remains ON, the on board diagnostic system has

detected an engine system malfunction.

Priority

Items

1

Freeze frame data

Misfire — DTC: P0300 - P0306
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175

2

Except the above items (Includes CVT related items)

3

1st trip freeze frame data

JSBIA1315ZZ

TM-38

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[CVT: RE0F09B]

DIAGNOSIS SYSTEM (TCM)

DIAGNOSIS SYSTEM (TCM)

CONSULT Function

INFOID:0000000010113453

FUNCTION

CONSULT can display each diagnostic item using the diagnostic test modes shown following.

WORK SUPPORT MODE

Display Item List

Engine Brake Adjustment

CAUTION:

Mode of “+1”“0”“

−1”“−2”“OFF” can be selected by touching “UP”or “DOWN” on CONSULT screen.

However, do not select a mode other than “0” and “OFF”. Selecting “+1” or “

−1” or “–2” may cause

irregular driveability.

Check CVT Fluid Deterioration Date

CAUTION:

Touch “CLEAR” after changing CVT fluid, and then erase “CVTF DETERIORATION DATE”.

SELF DIAGNOSTIC RESULTS MODE

Display Items List

Refer to 

TM-124, "DTC Index"

.

DATA MONITOR MODE

Display Items List

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 Diagnostic Support Monitor

It monitors the status of CAN communication.

ECU Identification

Display the ECU identification number (part number etc.) of the selected system.

CALIB DATA

Characteristic information for TCM and CVT assembly can be read. Do not use, but displayed.

Item name

Description

ENGINE BRAKE ADJ.

The engine brake level setting can be canceled.

CONFORM CVTF DETERIORTN

The CVT fluid deterioration level can be checked.

“ENGINE BRAKE LEVEL”
0

: Initial set value (Engine brake level control is activated)

OFF

: Engine brake level control is deactivated.

“CVTF DETERIORATION DATE”
210000 or more

: It is necessary to change CVT fluid.

Less than 210000

: It is not necessary to change CVT fluid.

DIAGNOSIS SYSTEM (TCM)

TM-39

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 X: Standard, —: Not applicable,  : Option

Monitored item (Unit)

Monitor item selection

Remarks

 ECU IN-

PUT SIG-

NALS

MAIN SIG-

NALS

SELEC-

TION 

FROM 
MENU

VSP SENSOR (km/h)

X

—

Secondary speed sensor

ESTM VSP SIG (km/h)

X

—

—

PRI SPEED SEN (rpm) 

X

—

—

ENG SPEED SIG (rpm) 

X

—

—

SEC HYDR SEN (V)

X

—

—

PRI HYDR SEN (V)

X

—

—

ATF TEMP SEN (V)

X

—

CVT fluid temperature sensor

VIGN SEN (V)

 X

—

—

VEHICLE SPEED (km/h or mph)

—

X

Vehicle speed recognized by the TCM.

PRI SPEED (rpm)

—

X

Primary pulley speed

SEC SPEED (rpm)

—

—

Secondary pulley speed

ENG SPEED (rpm) 

—

X

—

SLIP REV (rpm)

—

X

Difference between engine speed and primary 
pulley speed.

GEAR RATIO

—

X

—

G SPEED (G)

—

—

—

ACC PEDAL OPEN (0.0/8)

X

X

Degree of opening for accelerator recognized by 
the TCM.
For fail-safe operation, the specific value used for 
control is displayed.

TRQ RTO

—

—

—

SEC PRESS (MPa)

—

X

—

PRI PRESS (MPa)

—

X

—

ATFTEMP COUNT

—

X

Means CVT fluid temperature. Actual oil temper-
ature 

°C (°F) cannot be checked unless a numeric 

value is converted. Refer to 

TM-152

.

DSR REV (rpm)

—

—

—

DGEAR RATIO

—

—

—

DSTM STEP (step)

—

—

—

STM STEP (step)

—

X

—

LU PRS (MPa)

—

—

—

LINE PRS (MPa)

—

—

—

TGT SEC PRESS (MPa)

—

—

—

ISOLT1 (A)

—

X

Torque converter clutch solenoid valve output 
current

ISOLT2 (A)

—

X

Line pressure solenoid valve output current

ISOLT3 (A)

—

X

Secondary pressure solenoid valve output cur-
rent