P0740

Tests 1636 - 1639:

Tests 1640 - 1643:

Tests 1644 - 1647:

Tests 1648 - 1651:

SYMPTOM
P-0740 TORQ CONV CLU, NO RPM DROP AT LOCKUP

WHEN MONITORED
Continuously with the key on.

SET CONDITION
If the TCC cannot achieve the desired drop in engine RPM when the TCC solenoid is near maximum duty. Three consecutive bad test are required to set the code.

POSSIBLE CAUSES
- TCC solenoid wiring harness observable def
- Vehicle stalls (torque converter clutch solenoid)
- "Misfire trouble" code set
- Transmission fluid contaminated
- TCC shaft(s)/seals defective (no stall)
- Torque converter clutch defective
- Torque converter clutch hydraulic circuit damaged
- Torque converter clutch shaft(s)/seal defective (no ckp sig)