Page 89 of 3051

Diagnostic ProcedureNLAT0039
1 CHECK SECONDARY SPEED SENSOR
Refer to ªComponent Inspectionº, AT-89.
OK or NG
OK (With CONSULT-II)©GO TO 2.
OK (Without CONSULT-
II)©GO TO 3.
NG©Repair or replace secondary speed sensor.
2 CHECK INPUT SIGNAL (With CONSULT-II)
With CONSULT-II
1. Start engine.
2. Select ªTCM INPUT SIGNALSº in ªDATA MONITORº mode for ªCVTº with CONSULT-II.
3. Read out the value of ªVHCL/S SE´A/Tº while driving.
Check the value changes according to driving speed.
OK or NG
OK©GO TO 3.
NG©Check the following items:
+Harness for short or open between TCM, ECM and secondary speed sensor (Main
harness)
+Ground circuit for ECM
Refer to EC section (ªTROUBLE DIAGNOSIS FOR POWER SUPPLYº).
3 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-84.
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 P0720 VEHICLE SPEED SENSOR
(SECONDARY SPEED SENSOR)
EURO-OBD
Diagnostic Procedure
AT-88
Page 90 of 3051
SAT231K
Component InspectionNLAT0040SECONDARY SPEED SENSORNLAT0040S011. Jacking up the vehicle.
2. Check pulse by using the pulse measurement function of
CONSULT-II when front wheel rotating.
+CONSULT-II cable connected to data link connector.
At front wheel rotating [D position, 20 km/h (12 MPH)]: Approx.
600 Hz
DTC P0720 VEHICLE SPEED SENSOR
(SECONDARY SPEED SENSOR)
EURO-OBD
Component Inspection
AT-89
Page 91 of 3051

DescriptionNLAT0041The engine speed signal is sent from the ECM to the TCM.
TCM TERMINALS AND REFERENCE VALUENLAT0041S01Remarks: Specification data are reference values.
Terminal
No.Wire color Item ConditionJudgement stan-
dard (Approx.)
39 L/OREngine speed sig-
nal
When engine runs at idle speed. 0.5 - 1.5V
ON BOARD DIAGNOSIS LOGICNLAT0041S02
Diagnostic trouble code Malfunction is detected when ... Check item (Possible cause)
: ENGINE SPEED SIG
TCM does not receive the proper voltage
signal from ECM.+Harness or connectors
(The sensor circuit is open or shorted.)
: P0725
: MI Code No. 0725
SAT250K
SAT255K
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NLAT0041S03CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If ªDIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DUREº has been previously conducted, always turn ignition
switch ªOFFº 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 ªONº and select ªDATA MONITORº mode
for ªENGINEº with CONSULT-II.
2) Start engine and maintain the following conditions for at least
10 consecutive seconds.
VHCL SPEED SE: 10 km/h (6 MPH) or more
THRTL POS SEN: More than 1.3V
Selector lever: D position
If the check result is ªNGº, go to ªDiagnostic Procedureº, AT-92
With GST
Follow the procedure ªWith CONSULT-IIº.
DTC P0725 ENGINE SPEED SIGNALEURO-OBD
Description
AT-90
Page 92 of 3051
Wiring Diagram Ð AT Ð ENGSSNLAT0202
YAT178
DTC P0725 ENGINE SPEED SIGNALEURO-OBD
Wiring Diagram Ð AT Ð ENGSS
AT-91
Page 93 of 3051

Diagnostic ProcedureNLAT0042
1 CHECK DTC WITH ECM
Perform diagnostic test mode II (self-diag results) for engine control. Check ignition signal circuit condition.
OK or NG
OK (With CONSULT-II)©GO TO 2.
OK (Without CONSULT-
II)©GO TO 3.
NG©Check ignition signal circuit for engine control. Refer to EC section (IGNITION SIGNAL).
2 CHECK INPUT SIGNAL (With CONSULT-II)
With CONSULT-II
1. Start engine.
2. Select ªTCM INPUT SIGNALSº in ªDATA MONITORº mode for ªCVTº with CONSULT-II.
3. Read out the value of ªENGINE SPEEDº.
Check engine speed changes according to throttle position.
OK or NG
OK©GO TO 4.
NG©Check the following items:
+Harness for short or open between TCM and ECM
+Resistor and ignition coil
Refer to EC section (IGNITION SIGNAL).
3 CHECK INPUT SIGNAL (Without CONSULT-II)
Without CONSULT-II
1. Start engine.
2. Check voltage between TCM terminal 39 and ground.
Voltage (Idle speed):
0.5 - 1.5V
SAT424JA
OK or NG
OK©GO TO 4.
NG©Check the following items:
+Harness for short or open between TCM and ECM
+Resistor and ignition coil
Refer to EC section (IGNITION SIGNAL).
DTC P0725 ENGINE SPEED SIGNALEURO-OBD
Diagnostic Procedure
AT-92
Page 94 of 3051
4 CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure, AT-90.
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 P0725 ENGINE SPEED SIGNALEURO-OBD
Diagnostic Procedure (Cont'd)
AT-93
Page 95 of 3051

DescriptionNLAT0055The torque converter clutch solenoid valve is activated by the TCM
in response to signals sent from the vehicle speed and throttle
position sensors. Lock-up piston operation will then be controlled.
Lock-up operation, however, is prohibited when CVT fluid tempera-
ture is too low.
When the accelerator pedal is depressed (less than 2/8) in lock-up
condition, the engine speed should not change abruptly. If there is
a big jump in engine speed, there is no lock-up.
CONSULT-II REFERENCE VALUE IN DATA MONITOR
MODE
NLAT0055S01Remarks: Specification data are reference values.
Monitor item Condition Specification
Torque converter clutch solenoid valve
dutyLock-up ªOFFº
¯
Lock-up ªONºApproximately 4%
¯
Approximately 94%
TCM TERMINALS AND REFERENCE VALUENLAT0055S02Remarks: Specification data are reference values.
Terminal
No.Wire color Item ConditionJudgement stan-
dard (Approx.)
3 GY/RTorque converter
clutch solenoid
valve
When CVT performs lock-up. 12.0V
When CVT does not perform lock-
up.0V
ON BOARD DIAGNOSIS LOGICNLAT0055S03
Diagnostic trouble code Malfunction is detected when ... Check items (Possible cause)
: TCC SOLENOID/CIRC
TCM detects an improper voltage drop
when it tries to operate the solenoid
valve.+Harness or connectors
(The solenoid circuit is open or shorted.)
+T/C clutch solenoid valve
: P0740
: MI Code No. 0740
SAT250K
DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION
PROCEDURE
NLAT0055S04NOTE:
If ªDIAGNOSTIC TROUBLE CODE CONFIRMATION PROCE-
DUREº has been previously conducted, always turn ignition
switch ªOFFº and wait at least 5 seconds before conducting
the next test.
After the repair, perform the following procedure to confirm the
malfunction is eliminated.
DTC P0740 TORQUE CONVERTER CLUTCH
SOLENOID VALVE
EURO-OBD
Description
AT-94
Page 96 of 3051
SAT255K
With CONSULT-II
1) Turn ignition switch ªONº.
2) Select ªDATA MONITORº mode for ªENGINEº with CON-
SULT-II and wait at least 10 seconds.
If the check result is ªNGº, go to ªDiagnostic Procedureº, AT-97.
With GST
Follow the procedure ªWith CONSULT-IIº.
DTC P0740 TORQUE CONVERTER CLUTCH
SOLENOID VALVE
EURO-OBD
Description (Cont'd)
AT-95