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” changes similarly to “STM STEP: −20 - 180” by DATA
MONITOR mode. Refer to CVT-47, "
CONSULT-III Function (TRANSMISSION)".
Without CONSULT-III
Inspect the engine speed (rise and descend), vehicle speed, throttle position, and check shift change. Refer to
CVT-181, "
Vehicle Speed When Shifting Gears".
OK or NG
OK >>INSPECTION END
NG >> Replace the transaxle assembly. Refer to CVT-178, "
Removal and Installation".

OVERDRIVE CONTROL SWITCH
CVT-143
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
CVT
N
O
P
OVERDRIVE CONTROL SWITCH
DescriptionINFOID:0000000001703654
• Overdrive control switch is installed to the selector lever.
• O/D OFF indicator turns ON, and overdrive driving activates when pressing the overdrive control switch
while driving in “D” position. O/D OFF indicator turns OFF, and “D” position driving starts when pressing the
overdrive control switch while driving in the overdrive-off mode. Shifting the selector lever in any position
other than “D” releases the overdrive-off mode.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703655
Item name Condition Display value
SPORT MODE SWWhile pushing overdrive cancel switch ON
Other conditions OFF

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".
Diagnosis ProcedureINFOID:0000000001703657
1.CHECK CAN COMMUNICATION LINE
BCWA0686E

OVERDRIVE CONTROL SWITCH
CVT-145
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
CVT
N
O
P
Perform the self-diagnosis check. Refer to CVT-47, "CONSULT-III Function (TRANSMISSION)".
Is any malfunction of the
“U1000 CAN COMM CIRCUIT” indicated in the results?
YES >> Check CAN communication line. Refer to CVT-56.
NO >> GO TO 2.
2.CHECK OVERDRIVE CONTROL SWITCH SIGNAL
With CONSULT-III
1. Turn ignition switch ON.
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Read out ON/OFF switching action of the “SPORT MODE SW”.
OK or NG
OK >>INSPECTION END
NG >> GO TO 3.
3.CHECK OVERDRIVE CONTROL SWITCH
Check overdrive control switch. Refer to CVT-146, "
Component Inspection"
OK or NG
OK >> GO TO 4.
NG >> Repair or replace damaged parts.
4.CHECK SELF-DIAGNOSTIC RESULTS (COMBINATION METER)
Perform self-diagnosis check. Refer to DI-11, "
Self-Diagnosis Mode of Combination Meter".
Is any malfunction detected by self-diagnostic?
YES >> Check the malfunctioning system.
NO - 1 >> With intelligent key: GO TO 5.
NO - 2 >> Without intelligent key: GO TO 6.
5.CHECK OVERDRIVE CONTROL SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect CVT device connector and combination meter connector.
3. Check continuity between CVT device harness connector (A)
terminal and combination meter harness connector (B) terminal.
Item name Condition Display value
SPORT MODE SWWhile pushing overdrive
cancel switchON
Other conditions OFF
Item Connector Terminal Continuity
CVT device harness connector M38 1
Ye s
Combination meter harness
connectorM24 8
SCIA7949E

CVT-146
< SERVICE INFORMATION >
OVERDRIVE CONTROL SWITCH
4. Check continuity between CVT device harness connector termi-
nal and ground.
5. If OK, check harness for short to ground and short to power.
6. Reinstall any part removed.
OK or NG
OK >>INSPECTION END
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
6.CHECK OVERDRIVE CONTROL SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect CVT device connector and combination meter connector.
3. Check continuity between CVT device harness connector (A)
terminal and combination meter harness connector (B) terminal.
4. Check continuity between CVT device harness connector termi-
nal and ground.
5. If OK, check harness for short to ground and short to power.
6. Reinstall any part removed.
OK or NG
OK >>INSPECTION END
NG >> Repair open circuit or short to ground or short to power
in harness or connectors.
Component InspectionINFOID:0000000001703658
OVERDRIVE CONTROL SWITCH
With Intelligent Key
Check continuity between CVT device harness connector terminals.
Without Intelligent Key
Item Connector Terminal Continuity
CVT device harness connector M38 2 - ground Yes
SCIA7950E
Item Connector Terminal Continuity
CVT device harness connector M38 1
Ye s
Combination meter harness
connectorM24 8
SCIA7951E
Item Connector Terminal Continuity
CVT device harness connector M38 2 - ground Yes
SCIA7952E
Item Condition Connector Terminal Continuity
Overdrive con-
trol switchWhile pushing
overdrive control
switchM38 1 - 2Ye s
Other conditions No
SCIA7942E

OVERDRIVE CONTROL SWITCH
CVT-147
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
CVT
N
O
P
Check continuity between CVT device harness connector terminals.
Item Condition Connector Terminal Continuity
Overdrive con-
trol switchWhile pushing
overdrive control
switchM38 1 - 2Ye s
Other conditions No
SCIA7943E

CVT-148
< SERVICE INFORMATION >
SHIFT POSITION INDICATOR CIRCUIT
SHIFT POSITION INDICATOR CIRCUIT
DescriptionINFOID:0000000001703659
TCM sends the switch signals to combination meter via CAN communication line. Then selector lever position
is indicated on the shift position indicator.
CONSULT-III Reference Value in Data Monitor ModeINFOID:0000000001703660
Diagnosis ProcedureINFOID:0000000001703661
1.CHECK INPUT SIGNALS
With CONSULT-III
1. Start engine.
2. Select “MAIN SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III and read
out the value of “RANGE”.
3. Check that the following three positions or indicators are same.
- Actual position of the selector lever
- “RANGE” on CONSULT-III screen
- Shift position indicator in the combination meter
OK or NG
OK >>INSPECTION END
NG >> Check the following.
SHIFT POSITION INDICATOR SYMPTOM CHART
Item name Condition Display value
RANGESelector lever in “N” or “P” position. N·P
Selector lever in “R” position. R
Selector lever in “D” position. D
Selector lever in “L” position. L
Items Presumed location of trouble
Actual position does not change.Park/neutral position switch
• Refer to CVT-65
.
CVT main system (Fail-safe function actuated)
• Refer to CVT-47, "
CONSULT-III Function (TRANSMISSION)".
Shift position indicator in the combination meter does not indicate
any position.
Perform the self-diagnosis for CVT and the combination meter.
• Refer to CVT-47, "
CONSULT-III Function (TRANSMISSION)"
and DI-4
. Actual position changes, but the shift position indicator in the com-
bination meter does not change.
Actual position differs from the shift position indicator in the com-
bination meter.
Shift position indicator in the combination meter does not indicate
specific position only.Check the combination meter.
• Refer to DI-4
.

TROUBLE DIAGNOSIS FOR SYMPTOMS
CVT-149
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
CVT
N
O
P
TROUBLE DIAGNOSIS FOR SYMPTOMS
Wiring Diagram - CVT - NONDTCINFOID:0000000001703662
BCWA0682E

CVT-150
< SERVICE INFORMATION >
TROUBLE DIAGNOSIS FOR SYMPTOMS
BCWA0683E

TROUBLE DIAGNOSIS FOR SYMPTOMS
CVT-151
< SERVICE INFORMATION >
D
E
F
G
H
I
J
K
L
MA
B
CVT
N
O
P
TCM TERMINALS AND REFERENCE VALUES
Refer to CVT-45, "TCM Terminal and Reference Value".
O/D OFF Indicator Lamp Does Not Come OnINFOID:0000000001703663
SYMPTOM:
BCWA0684E