2003 NISSAN TEANA Service Manual

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Page 1161 of 3502

NISSAN TEANA 2003 Service Manual DTC P1777 STEP MOTOR - CIRCUIT
CVT-155
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CVT

TCM terminals data are reference values.
Diagnostic ProcedureBCS001LY
1. CHECK INPUT SIGNAL
With CONSULT-II
1. Start engine.
2. Sel

Page 1162 of 3502

NISSAN TEANA 2003 Service Manual CVT-156
DTC P1777 STEP MOTOR - CIRCUIT

3. CHECK STEP MOTOR
Check step motor Refer to CVT-156, "
Component Inspection" .
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4. CHECK DTC
P

Page 1163 of 3502

NISSAN TEANA 2003 Service Manual DTC P1778 STEP MOTOR - FUNCTION
CVT-157
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CVT

DTC P1778 STEP MOTOR - FUNCTIONPFP:31947
DescriptionBCS001M0
The step motors 4 aspects of ON/OFF change according to the signal f

DTC P1778 STEP MOTOR - FUNCTION
CVT-157
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DTC P1778 STEP MOTOR - FUNCTIONPFP:31947
DescriptionBCS001M0
The step motor's 4 aspects of ON/OFF change according to the signal from TCM. As a result, the flow of
line pressure to primary pulley is changed and pulley ratio is controlled.
This diagnosis item is detected when electrical system is OK, but mechanical system is NG.
This diagnosis item is detected when the state of the changing the speed mechanism in unit does not
operate normally.
CONSULT-II Reference ValueBCS001M1
Remarks: Specification data are reference values.
On Board Diagnosis LogicBCS001M2
Diagnostic trouble code “P1778 STEP MOTR/FNC” with CONSULT-II is detected under the following condi-
tions.
When not changing the pulley ratio according to the instruction of TCM.
Possible CauseBCS001M3
Ste p mo to r
DTC Confirmation ProcedureBCS001M4
CAUTION:
Always drive vehicle at a safe speed.
Before starting “DTC Confirmation Procedure”, confirm “Hi” or “Mid” or “Low” fixation by “PRI
SPEED” and “VEHICLE SPEED” on “DATA MONITOR MODE”.
If hi-geared fixation occurred, go to CVT-158, "Diagnostic Procedure" .
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch OFF and
wait at least 10 seconds before performing the next test.
After the repair, touch “ERASE” on “SELF-DIAG RESULTS” and then perform the following procedure to con-
firm the malfunction is eliminated.
WITH CONSULT-II
1. Turn ignition switch ON and select “DATA MONITOR” mode for
“TRANSMISSION” with CONSULT-II.
2. Make sure that output voltage of CVT fluid temperature sensor
is within the range below.
ATF TEMP SEN: 1.0 - 2.0 V
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 “TRANSMISSION” 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
VEHICLE SPEED: 10 km/h (6 MPH) or more
ACC PEDAL OPEN: More than 1.0/8
RANGE: “D” position
ENG SPEED: 450 rpm or more
5. If DTC is detected, go to CVT-158, "
Diagnostic Procedure" .
Item name Condition Display value (Approx.)
STM STEP
During driving−20 step - 190 step
GEAR RATIO2.37 - 0.43
BCIA0031E

Page 1164 of 3502

NISSAN TEANA 2003 Service Manual CVT-158
DTC P1778 STEP MOTOR - FUNCTION

Diagnostic ProcedureBCS001M5
1. CHECK STEP MOTOR
With CONSULT-II
It is monitoring whether “GEAR RATIO: 2.37 - 0.43” changes similarly to “STM STEP: −

Page 1165 of 3502

NISSAN TEANA 2003 Service Manual CVT INDICATOR CIRCUIT
CVT-159
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CVT

CVT INDICATOR CIRCUITPFP:24810
DescriptionBCS001M6
TCM sends the switch signals to unified meter and A/C amp via CAN communication line. Then

Page 1166 of 3502

NISSAN TEANA 2003 Service Manual CVT-160
TROUBLE DIAGNOSIS FOR SYMPTOMS

TROUBLE DIAGNOSIS FOR SYMPTOMSPFP:00007
Wiring Diagram — CVT — NONDTCBCS001M9
TCWM0545E

Page 1167 of 3502

NISSAN TEANA 2003 Service Manual TROUBLE DIAGNOSIS FOR SYMPTOMS
CVT-161
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CVT

TCWM0546E

Page 1168 of 3502

NISSAN TEANA 2003 Service Manual CVT-162
TROUBLE DIAGNOSIS FOR SYMPTOMS

TCWM0547E

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