Nissan Primera P11. Instruction — part 23
Diagnostic Procedure
NCAT0226
1
CHECK POWER SOURCE CIRCUIT
1. Turn ignition switch to “ON” position.
2. Check “SELF-DIAGNOSIS” with CONSULT-II.
3. If “CVT SAFE FUNCTION” activate, refer to “CVT SAFE FUNCTION” AT-99.
4. Turn ignition switch to “OFF” position.
5. Disconnect TCM harness connector.
6. Check continuity between terminal 2, 3, 4, 5 and TCM harness connector terminal 11, 12, 20, 21.
Continuity should exist.
SAT655J
Step motor connector
If OK, check harness for short to ground and short to power.
7. Reinstall any part removed.
OK or NG
OK
©
GO TO 2.
NG
©
Repair open circuit or short to ground or short to power in harness or connectors.
2
CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-91.
OK or NG
OK
©
INSPECTION END
NG
©
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness con-
nector.
DTC P1777 STEP MOTOR — CIRCUIT
Diagnostic Procedure
AT-89
Component Inspection
=NCAT0227
STEP MOTOR
NCAT0227S01
Resistance Check
NCAT0227S0101
I
Check resistance between terminals.
Control valve
Terminal No.
Resistance (Approx.)
Step motor
2 and 3
28
Ω
4 and 5
2 and ground
14
Ω
3 and ground
4 and ground
5 and ground
SAT690J
CVT fluid pressure sensor connector
DTC P1777 STEP MOTOR — CIRCUIT
Component Inspection
AT-90
Description
NCAT0228
I
The step motor is ON/OFF of 4 aspects changes according to
the signal from TCM.
As a result, the flow of line pressure to primary pulley is
changed and pulley ratio is controlled.
I
This diagnosis item detects when electrical system is OK but,
mechanical system is NG.
I
This diagnosis item detects when the state that the changing
the speed mechanism in unit does not operate normally.
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NCAT0228S01
It is monitoring whether “CVT RATIO: 2.32 - 0.47” changes similarly
to “PLY CONT STEP: 3 - 200” by DATA MONITOR mode.
ON BOARD DIAGNOSIS LOGIC
NCAT0228S03
Diagnostic trouble code
Malfunction is detected when ...
Check items (Possible cause)
: STEP MOTOR/FNCTN
When not changing the speed according
to the instruction of TCM.
I
Step motor
: P1778
: MI Code No. 1778
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NCAT0228S04
CAUTION:
I
Always drive vehicle at a safe speed.
I
Be careful not to rev engine into the red zone on the
tachometer.
I
Before start “DIAGNOSTIC TROUBLE CODE (DTC) CON-
FIRMATION PROCEDURE”, confirm “Hi” or “Mid” or
“Low” fixation by “I/P PULLY SPD” and “VHCL SPEED SE”
on “DATA MONITOR MODE”.
I
If hi-geared fixation, go to diagnostic procedure soon.
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.
SAT651J
SAT971J
DTC P1778 STEP MOTOR — FUNCTION
Description
AT-91
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 “ENGINE” mode for “ENGINE” with CONSULT-II.
4)
Start engine and maintain the following conditions for at least
30 consecutive seconds.
TEST START FROM 0 km/h (0 MPH)
CONSTANT ACCELERATION: Keep 30 sec or more
VHCL SPEED SE: 10 km/h (6 MPH) or more
THRTL POS SEN: More than 1.3V
Selector lever: D position
ENG SPEED: 450 rpm or more
If the check result is NG, go to “DIAGNOSTIC PROCEDURE”,
AT-93.
With GST
Follow the procedure “With CONSULT-II”.
SAT654J
DTC P1778 STEP MOTOR — FUNCTION
Description (Cont’d)
AT-92
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