Nissan Primera P11. Instruction — part 4
CONTROL SYSTEM
NCAT0014S02
NAT310
Wheel
Differential
gear
Final gear
Belt and
Pulley
Forward and
reverse
change
Torque
converter
Engine
Transaxle
Oil pump
Oil pressure control
Parking
system
Control device
Sport mode SW or
instruction mode SW
Electrical control
Control valve
Primary pulley
speed and
secondary pulley
speed sensor
CVT indicator
(warning) lamp or
SPORT indicator lamp
[Hyper CVT-M6]
Position
indicator
Indicator C/U
TCM
Mechanical system
Oil system
Electrical system
Stop lamp SW
ABS C/U
ECM
Throttle
opening
sensor
Engine speed sensor
PNP switch
OVERALL SYSTEM
Control System (Cont’d)
AT-13
TCM FUNCTION
=NCAT0014S03
The function of the TCM is to:
I
Receive input signals sent from various switches and sensors.
I
Determine required line pressure, shifting point and lock-up operation.
I
Send required output signals to the step motor and the respective solenoids.
INPUT/OUTPUT SIGNAL OF TCM
NCAT0014S04
Sensors and actuators
Function
Input
PNP switch
Detects select lever position and sends a signal to TCM.
Throttle position sensor
Detects throttle valve position and sends a signal to TCM.
Closed throttle position switch
Detects throttle valve’s fully-closed position and sends a signal to TCM.
Wide open throttle position switch
Detects a throttle valve position of greater than 1/2 of full throttle and
sends a signal to TCM.
Engine speed signal
From ECM.
CVT fluid temperature sensor
Detects transmission fluid temperature and sends a signal to TCM.
CVT fluid pressure sensor
Detects transmission fluid pressure and sends a signal to TCM.
Primary speed sensor
Detects primary pulley rpm and sends a signal to TCM.
Secondary speed sensor
Detects secondary pulley rpm and sends a signal to TCM.
Stop lamp switch
Sends a signal to the TCM relaying the operation condition of the brake
pedal.
Sport mode switch
Sends a signal to the TCM relaying the operation condition of the sport
mode switch.
Indicator control unit*1
Sends a signal to the TCM operation condition of the instruction mode switch
in control device.
ABS control unit
Sends a signal to the TCM operation condition of the ABS.
Output
Step motor
Regulates pulley position in relation to a signal sent from TCM.
Line pressure solenoid valve
Regulates (or decreases) line pressure suited to driving conditions in rela-
tion to a signal sent from TCM.
Torque converter clutch solenoid
valve
Regulates (or decreases) lock-up pressure suited to driving conditions in
relation to a signal sent from TCM.
CVT indicator (warning) lamp*2
Shows TCM faults, when CVT control components malfunction.
SPORT indicator lamp*3
Shows the operation condition of the SPORT mode switch. *3
Indicator control unit *1
Receives the information of gear position on instruction mode from TCM, and
sends a signal to indicator.
*1: Hyper CVT M6 models only
*2: Hyper CVT M6 models
*3: Hyper CVT models
OVERALL SYSTEM
Control System (Cont’d)
AT-14
Introduction
NCAT0017
The CVT system has two self-diagnostic systems.
The first is the emission-related on board diagnostic system (OBD) performed by the TCM in combination with
the ECM. The malfunction is indicated by the MI (malfunction indicator) and is stored as a DTC in the ECM
memory but not the TCM memory.
The second is the TCM original self-diagnosis indicated by the CVT indicator (warning) lamp or SPORT indi-
cator lamp. The malfunction is stored in the TCM memory. The detected items are overlapped with OBD self-
diagnostic items. For detail, refer to AT-26.
OBD Function for CVT System
NCAT0018
The ECM provides emission-related on board diagnostic (OBD) 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 MI (malfunction indicator) on the instrument panel. Sensors, switches and
solenoid valves are used as sensing elements.
The MI automatically illuminates in Two Trip Detection Logic when a malfunction is sensed in relation to CVT
system parts.
OBD Diagnostic Trouble Code (DTC)
NCAT0020
HOW TO READ DTC AND 1ST TRIP DTC
NCAT0020S01
DTC and 1st trip DTC can be read by the following methods.
1. (
No Tools) The number of blinks of the malfunction indicator in the Diagnostic Test Mode II (Self-Di-
agnostic Results) Examples: 0705, 0710, 0715, 0720, etc. For details, refer to EC section [“Malfunction
Indicator (MI)”, “ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION”].
These DTCs are controlled by NISSAN.
2. (
with CONSULT-II or
GST) CONSULT-II or GST (Generic Scan Tool) Examples: P0705, P0710,
P0720, P0725, etc.
These DTCs are prescribed by ISO15031-6.
(CONSULT-II also displays the malfunctioning component or system.)
I
1st trip DTC No. is the same as DTC No.
I
Output of the diagnostic trouble code indicates that the indicated circuit has a malfunction.
However, 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, using CONSULT-II (if available) is rec-
ommended.
A sample of CONSULT-II display for DTC is shown at left. DTC or 1st trip DTC of a malfunction is displayed
in SELF-DIAGNOSTIC RESULTS mode for “ENGINE” with CONSULT-II. 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”.
SAT651J
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
Introduction
AT-15
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
NCAT0020S0101
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
detail, refer to EC section (“CONSULT-II”, “ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION”).
Only one set of freeze frame data (either 1st trip freeze frame data of 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 prior-
ity 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/MI 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 following priorities to update the data.
Prior-
ity
Items
1
Freeze frame data
Misfire — DTC: P0300 - P0306 (0300 - 0306)
Fuel Injection System Function — DTC: P0171 (0171), P0172 (0172), P0174 (0174), P0175
(0175)
2
Except the above items (Includes CVT related items)
3
1st trip freeze frame data
Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM
memory is erased.
HOW TO ERASE DTC
NCAT0020S02
The diagnostic trouble code can be erased by CONSULT-II, GST or ECM DIAGNOSTIC TEST MODE as
described following.
I
If the battery terminal is disconnected, the diagnostic trouble code will be lost within 24 hours.
I
When you erase the DTC, using CONSULT-II or GST is easier and quicker than switching the mode
selector on the ECM.
SAT581J
SAT582J
ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION
OBD Diagnostic Trouble Code (DTC) (Cont’d)
AT-16
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