Symptom:
P0740-TORQ CONV CLU, NO RPM DROP AT LOCKUP (3SP AUTO
TRANS)
When Monitored and Set Condition:
P0740-TORQ CONV CLU, NO RPM DROP AT LOCKUP (3SP AUTO TRANS)
When Monitored: Run in third with converter unlocked for 10 seconds, apply throttle
until it locks then run for 5 seconds, vehicle speed less than 60 MPH. No DTCs set for: TCC
solenoids, any cam/crank conditions, VSS, TPS signal, TPS voltage too high or too low.
Set Condition: Torque converter malfunctions are detected when it does not lock or
unlock properly. Two consecutive trips that fail will store the code. Mountainous terrain
may cause this trouble code.
POSSIBLE CAUSES
INTERMITTENT CONDITION
DTCS PRESENT
TRANSMISSION FLUID
TIRE AND WHEEL SIZE
FUSED IGNITION OUTPUT CIRCUIT
TCC SOLENOID
TCC ASSEMBLY OR TCC SOLENOID STUCK
TCC SOLENOID OPERATION
TEST ACTION APPLICABILITY
1 Turn the ignition on.
With the DRBIIIt, read DTC's.
Is the Good Trip Counter displayed and equal to zero?All
Ye s®Go To 2
No®Go To 9
165
DRIVEABILITY - GAS
TEST ACTION APPLICABILITY
2 Turn the ignition on.
With the DRBIIIt, read DTCs.
Are any of the following DTCs set in the PCM memory?
P0122 - Throttle Position Sensor Voltage Low
P0123 - Throttle Position Sensor High
P0320 - No Crank Reference Signal At PCM
P0743 - Torque Converter Clutch Solenoid/Trans Relay Circuits
P0300, P0301, P0302, P0303 or P0304 Misfire DTC(s)
Did any of the above DTCs set along with P0740All
Ye s®Refer to the Driveability Category and perform the appropriate
symptom before proceeding.
Perform 31TH TRANSMISSION VERIFICATION TEST - VER
1..
No®Go To 3
3 Check the transmission fluid level and condition.
Is the fluid level OK and free of contamination?All
Ye s®Go To 4
No®Repair the fliuld level and/or condition as necessary.
Perform 31TH TRANSMISSION VERIFICATION TEST - VER
1..
4 Inspect the front wheels and tires. Ensure the wheels and tires are the manufactures
recommended size.
Ensure both left and right wheels and tires are the same size.
Were any problems found?All
Ye s®Repair or replace as necessary.
Perform 31TH TRANSMISSION VERIFICATION TEST - VER
1..
No®Go To 5
5 Turn the ignition off.
Disconnect the TCC Solenoid harness connector.
Turn the ignition on.
Measure the voltage of the Fused Ignition Switch Output circuit in the TCC Solenoid
harness connector.
Is the voltage above 10.0 volts?All
Ye s®Go To 6
No®Repair the Fused Ignition Switch Output circuit for an open.
Perform 31TH TRANSMISSION VERIFICATION TEST - VER
1..
6 Turn the ignition off.
Disconnect the TCC Solenoid harness connector.
Measure the resistance across the TCC Solenoid.
Is the resistance between 30.0 and 50.0 ohms?All
Ye s®Go To 7
No®Replace the TCC Solenoid.
Perform 31TH TRANSMISSION VERIFICATION TEST - VER
1..
166
DRIVEABILITY - GAS
P0740-TORQ CONV CLU, NO RPM DROP AT LOCKUP (3SP AUTO TRANS)
Ð
Continued
