Nissan Primera P11. Instruction — part 24
Diagnostic Procedure
NCAT0230
1
CHECK STEP MOTOR
I
It is monitoring whether “CVT ratio: 2.32 - 0.47” changes similarly to “PLY CONT STEP: -3 - 200” by DATA MONITOR mode.
I
If no CONSULT-II, inspect the engine speed (rise and descend) about vehicle speed and throttle opening angle, and check shift
change.
OK or NG
OK
©
INSPECTION END
NG
©
Replace CVT assembly.
DTC P1778 STEP MOTOR — FUNCTION
Diagnostic Procedure
AT-93
Description
NCAT0232
I
The CVT fluid pressure sensor detects line pressure of CVT,
and sends TCM the signal.
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NCAT0232S01
Remarks: Specification data are reference values.
Monitor item
Condition
Specification
CVT fluid pressure sensor
Throttle valve fully closed (PL Duty: 4%)
"
Throttle valve fully depressed
(PL Duty: 94%)
Approx. 1.0 V
"
Approx. 4.0 V
TCM TERMINALS AND REFERENCE VALUE
NCAT0232S02
Remarks: Specification data are reference values.
Terminal
No.
Wire color
Item
Condition
Judgement
standard
37
W/G
CVT fluid pressure
sensor
When engine runs at idle speed.
Approx. 1.0 V
When engine runs at stall speed.
Approx. 4.0V
42
B
—
—
46
P/L
—
4.5 - 5.5 V
ON BOARD DIAGNOSIS LOGIC
NCAT0232S03
Diagnostic trouble code
Malfunction is detected when ...
Check items (Possible cause)
: LINE PRESS SEN
TCM receives an excessively low or high
voltage from the step motor.
I
Harness or connectors
(The sensor circuit is open or shorted.)
I
CVT fluid pressure sensor
: P1791
: MI Code No. 1791
DTC P1791 CVT FLUID PRESSURE SENSOR
Description
AT-94
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NCAT0232S04
CAUTION:
I
Always drive vehicle at a safe speed.
I
Be careful not to rev engine into the red zone on the
tachometer.
NOTE:
If “DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DURE” has been previously conducted, always turn ignition
switch “OFF” and wait at least 5 seconds before conducting
the next test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
With CONSULT-II
1)
Turn ignition switch “ON” and select “DATA MONITOR” mode
for “CVT” with CONSULT-II.
2)
Make sure that output voltage of CVT fluid temperature sne-
sor is within the range below.
FLUID TEMP SEN: 0.5 - 1.5V
If out of range, drive the vehicle to decrease the voltage
(warm up the fluid) or stop engine to increase the voltage
(cool down the fluid)
3)
Select “DATA MONITOR” mode for “ENGINE” with CONSULT-
II.
4)
Start engine and maintain the following conditions for at least
5 consecutive seconds.
VHCL SPEED SE: 10 km/h (6 MPH) or more
THRTL POS SEN: 1.3V
Selector lever: D position
ENG SPEED: 450 rpm or more
If the check result is NG, go to “Diagnostic Procedure”, AT-97.
With GST
Follow the procedure “With CONSULT-II”.
SAT651J
SAT971J
SAT654J
DTC P1791 CVT FLUID PRESSURE SENSOR
Description (Cont’d)
AT-95
Wiring Diagram — AT — FPS
NCAT0233
YAT209
TCM
(TRANSMISSION
CONTROL MODULE)
: Detectable line for DTC
: Non-detectable line for DTC
CONTROL VALVE
(CVT FLUID
PRESSURE
SENSOR)
ECM
DTC P1791 CVT FLUID PRESSURE SENSOR
Wiring Diagram — AT — FPS
AT-96
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