2008 NISSAN LATIO Service Repair Manual

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Page 977 of 2771

NISSAN LATIO 2008 Service Repair Manual CVT-138
< SERVICE INFORMATION >
DTC P1777 STEP MOTOR - CIRCUIT
Wiring Diagram - CVT - STM
INFOID:0000000001703645
TCM TERMINALS AND REFERENCE VALUES
Refer to CVT-45, "TCM Terminal and Reference Va

Page 978 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P1777 STEP MOTOR - CIRCUIT
CVT-139
< SERVICE INFORMATION >
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Diagnosis ProcedureINFOID:0000000001703646
1.CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Se

Page 979 of 2771

NISSAN LATIO 2008 Service Repair Manual CVT-140
< SERVICE INFORMATION >
DTC P1777 STEP MOTOR - CIRCUIT
5.CHECK TCM
1. Check TCM input/output signals. Refer to CVT-45, "
TCM Terminal and Reference Value" .
2. If NG, re-check TCM pin

Page 980 of 2771

NISSAN LATIO 2008 Service Repair Manual DTC P1778 STEP MOTOR - FUNCTION
CVT-141
< SERVICE INFORMATION >
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DTC P1778 STEP MOTOR - FUNCTION
DescriptionINFOID:0000000001703648
• The step motor is included in th

DTC P1778 STEP MOTOR - FUNCTION
CVT-141
< SERVICE INFORMATION >
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DTC P1778 STEP MOTOR - FUNCTION
DescriptionINFOID:0000000001703648
• The step motor is included in the control valve assembly.
• 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 oper-
ate normally.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703649
Remarks: Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000001703650
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P1778 STEP MOTR/FNC” with CONSULT-III is detected under the following condi-
tions.
- When not changing the pulley ratio according to the instruction of TCM.
Possible CauseINFOID:0000000001703651
Step motor
DTC Confirmation ProcedureINFOID:0000000001703652
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-142, "
Diagnosis 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-III
1. Turn ignition switch ON and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
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-III.
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-142, "
Diagnosis Procedure".
WITH GST
Follow the procedure “WITH CONSULT-III”.
Item name Condition Display value (Approx.)
STM STEP
During driving−20 step - 180 step
GEAR RATIO2.56 - 0.43

Page 981 of 2771

NISSAN LATIO 2008 Service Repair Manual CVT-142
< SERVICE INFORMATION >
DTC P1778 STEP MOTOR - FUNCTION
Diagnosis Procedure
INFOID:0000000001703653
1.CHECK STEP MOTOR
With CONSULT-III
It is monitoring whether “GEAR RATIO: 2.56 - 0.43” c

Page 982 of 2771

NISSAN LATIO 2008 Service Repair Manual OVERDRIVE CONTROL SWITCH
CVT-143
< SERVICE INFORMATION >
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OVERDRIVE CONTROL SWITCH
DescriptionINFOID:0000000001703654
• Overdrive control switch is installed to the s

Page 983 of 2771

NISSAN LATIO 2008 Service Repair Manual CVT-144
< SERVICE INFORMATION >
OVERDRIVE CONTROL SWITCH
Wiring Diagram - CVT - ODSW
INFOID:0000000001703656
TCM TERMINALS AND REFERENCE VALUES
Refer to CVT-45, "TCM Terminal and Reference Value&#

Page 984 of 2771

NISSAN LATIO 2008 Service Repair Manual OVERDRIVE CONTROL SWITCH
CVT-145
< SERVICE INFORMATION >
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Perform the self-diagnosis check. Refer to CVT-47, "CONSULT-III Function (TRANSMISSION)".
Is any malfu

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