2006 NISSAN VERSA Workshop Service Repair Manual

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Page 921 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual CVT-24
CVT SYSTEM
Revision: June 20062007 Versa
TCM FunctionUCS005XT
The function of the TCM is to:
Receive input signals sent from various switches and sensors.
Determine required line pressure, sh

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NISSAN VERSA 2006 Workshop Service Repair Manual CVT SYSTEM
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CAN CommunicationUCS005XU
SYSTEM DESCRIPTION
CAN (Controller Area Network) is a serial communication line for real time appl

Page 923 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual CVT-26
CVT SYSTEM
Revision: June 20062007 Versa
Line Pressure and Secondary Pressure ControlUCS005XW
When an input torque signal equivalent to the engine drive force is sent from the ECM to the TCM,

Page 924 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual CVT SYSTEM
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NOTE:
The gear ratio is set for every position separately.
“D” POSITION
Shifting over all the ranges of gear ratios from

Page 925 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual CVT-28
CVT SYSTEM
Revision: June 20062007 Versa
Lock-up and Select ControlUCS005XY
The torque converter clutch piston in the torque converter is engaged to eliminate torque converter slip to
increase

Page 926 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual CVT SYSTEM
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Control ValveUCS005XZ
FUNCTION OF CONTROL VALVE
Name Function
Torque converter regulator valve Optimizes the supply pressure

Page 927 of 2896

NISSAN VERSA 2006 Workshop Service Repair Manual CVT-30
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision: June 20062007 Versa
ON BOARD DIAGNOSTIC (OBD) SYSTEMPFP:00028
IntroductionUCS005Y0
The CVT system has two self-diagnostic systems.
The first is the em

CVT-30
ON BOARD DIAGNOSTIC (OBD) SYSTEM
Revision: June 20062007 Versa
ON BOARD DIAGNOSTIC (OBD) SYSTEMPFP:00028
IntroductionUCS005Y0
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. The malfunction is indicated by the MIL (malfunction indicator lamp) and is stored as a DTC in
the ECM memory, and the TCM memory.
The second is the TCM original self-diagnosis performed by the TCM. The malfunction is stored in the TCM
memory. The detected items are overlapped with OBD-II self-diagnostic items. For detail, refer to CVT-61,
"Display Items List" .
OBD-II Function for CVT SystemUCS005Y1
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 relation
to CVT system parts.
One or Two Trip Detection Logic of OBD-IIUCS005Y2
ONE TRIP DETECTION LOGIC
If a malfunction is sensed during the first test drive, the MIL will illuminate and the malfunction will be stored in
the ECM memory 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 will 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)UCS005Y3
HOW TO READ DTC AND 1ST TRIP DTC
DTC and 1st trip DTC can be read by the following methods.
( with CONSULT-II or GST) CONSULT-II or GST (Generic Scan Tool) Examples: P0705, P0720 etc.
These DTC are prescribed by SAE J2012.
(CONSULT-II 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 occurred in the past and returned to normal.
CONSULT-II can identify them as shown below, therefore, CONSULT-II (if available) is recom-
mended.
A sample of CONSULT-II display for DTC and 1st trip DTC is shown
on the next page. DTC or 1st trip DTC of a malfunction is displayed
in SELF-DIAGNOSTIC RESULTS mode for “ENGINE” with CON-
SULT-II. Time data indicates how many times the vehicle was driven
after the last detection of a DTC.
BCIA0030E

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NISSAN VERSA 2006 Workshop Service Repair Manual ON BOARD DIAGNOSTIC (OBD) SYSTEM
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If the DTC is being detected currently, the time data will be “0”.
If a 1st trip DTC is stored in t

ON BOARD DIAGNOSTIC (OBD) SYSTEM
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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 condition 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 which 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-II
or GST. The 1st trip freeze frame data can only be displayed on the CONSULT-II screen, not on the GST. For
details, refer to EC-113, "
CONSULT-II Function (ENGINE)" .
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
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-II, GST or ECM DIAGNOSTIC TEST MODE as
described following.
If the battery cable is disconnected, the diagnostic trouble code will be lost within 24 hours.
When you erase the DTC, using CONSULT-II or GST is easier and quicker than switching the mode
selector 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-48, "
Emission-related Diagnostic Information" .
Diagnostic trouble codes (DTC)
1st trip diagnostic trouble codes (1st trip DTC)
Freeze frame data
SAT0 1 5K
SAT0 1 6K
Priority Items
1
Freeze frame dataMisfire — 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

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