P0743
DTC P0743 TORQUE CONVERTER CLUTCH CIRCUIT - ELECTRICALCOMPONENT LOCATION:
GENERAL DESCRIPTION
Refer to DTC P0741. P0741
DTC DESCRIPTION
The PCM checks the Damper Clutch Control Signal by monitoring the feedback signal from the solenoid valve drive circuit. If an unexpected signal is monitored (for example, high voltage is detected when low voltage is expected, or low voltage is detected when high voltage is expected) the PCM judges that DCCSV circuit is malfunctioning and sets this code.
DTC DETECTING CONDITION:
SCHEMATIC DIAGRAM
Refer to DTC P0741. P0741
SIGNAL WAVEFORM:
MONITOR SCANTOOL DATA
1. Connect Scantool to data link connector(DLC).
2. Engine "ON".
3. Monitor the "TCC SOL. VALVE" parameter on the Scantool.
4. Select "D RANGE" and operate the vehicle.
5. Check "TCC SOL. VALVE" parameter value changes while driving.
6. Does "TCC SOLENOID DUTY" follow the reference data?
YES
^ Fault is intermittent caused by poor contact in the sensor's and/or PCM's connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
NO
^ Go to "Terminal & connector inspection" procedure.
TERMINAL & CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES
^ Repair as necessary and then go to "Verification of vehicle repair" procedure.
NO
^ Go to "Signal circuit inspection" procedure.
SIGNAL CIRCUIT INSPECTION
1. Disconnect "A/T SOLENOID VALVE" connector.
2. IGNITION "ON", ENGINE "OFF".
3. Measure voltage between terminal "1" of the sensor harness connector and chassis ground.
4. Is resistance within specifications?
YES
^ Go to "Component inspection" procedure.
NO
^ Check for open or short in harness. Repair as necessary and Go to "Verification of vehicle repair" procedure.
^ If signal circuit in harness is OK, Go to "Check PCM" of the "Component inspection" procedure
COMPONENT INSPECTION
1. CHECK SOLENOID VALVE
1) Ignition "OFF".
2) Disconnect "A/T SOLENOID VALVE" connector.
3) Measure resistance between terminal "1" and chassis ground.
4) Is resistance within specification?
YES
^ Go to "CHECK PCM" as below.
NO
^ Replace TCC SOLENOID VALVE as necessary and go to "Verification of vehicle repair" procedure.
2. CHECK PCM
1) Connect Scantool to data link connector(DLC).
2) Ignition "ON" & Engine "OFF".
3) Select A/T solenoid valve actuator test and operate actuator test.
4) Can you hear operating sound for TCC SOLENOID VALVE actuator testing function?
YES
^ Go to "Verification of vehicle repair" procedure.
NO
^ Replace PCM as necessary and Go to "Verification of vehicle repair" procedure
ACTUATOR TEST CONDITION
1. IG SWITCH ON
2. TRANSAXLE RANGE SWITCH is normal
3. P RANGE
4. Vehicle speed 0 mph(0 km/h)
5. Throttle position sensor< 1 V
6. IDLE SWITCH ON
7. ENGINE RP.
VERIFICATION OF VEHICLE REPAIR
Refer to DTC P0741. P0741