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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Automatic Transaxle Diagnosis - 4T65-E) >> Diagnostic Tests >> DTC P0741: TCC System Stuck Off >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the diagnostic system check? If so, go to next step. If not, see DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Did you perform the transmission fluid checking procedure? If so, go to next step. If not, perform the transmission fluid checking procedure. See CHECKING FLUID LEVEL & CONDITION under LUBRICATION in SERVICING - CENTURY & REGAL article.
  3. Install a scan tool. Turn ignition ON, engine OFF. Before clearing the DTCs, use the scan tool to record the freeze frame and failure records for reference. Using the Clear Info function will erase the stored freeze frame and failure records from the PCM. Record the freeze frame and failure records. Clear the DTCs. Drive vehicle at 45 mph. With the scan tool, command the TCC PWM solenoid valve ON. Monitor TCC slip speed. Does the scan tool indicate the TCC slip speed is within -50 RPM to +180 RPM? If so, go to DIAGNOSTIC AIDS  . If not, go to next step.
  4. Inspect the following components:
    • The cooling system for plugging.
    • The TCC control valve for sticking.
    • The TCC regulator apply valve for sticking.
    • The TCC PWM solenoid valve for sticking and the "O" ring seal for leaks.
    • The pressure regulator valve.
    • The TCC blowoff valve or spring for damage or improper seating.
    • The TCC signal orifice in the spacer plate for plugging.
    • The number one check ball missing or leaking.
    • The spacer plate gaskets for tearing or leaking.
    • The turbine shaft seals for leaks.
    • The TCC.
    Repair or replace component as necessary. When the repair is complete, go to next step.
  5. Select DTC. Select Clear Info. Operate the vehicle under the following conditions:
    • Drive the vehicle in D3 or D4 until the TCC is engaged.
    • The transmission fluid temperature is 68-266°F (20-130°C).
    • The TP angle must be 4-35 percent.
    • The time since the last range change is 6 seconds.
    • The TCC is commanded ON at greater than 50 percent duty cycle.
    • TCC slip speed must be less than 50 RPM for at least 4 seconds.
    Select specific DTC. Enter DTC P0741. If the test has run and passed, go to next step. If not passed, go to step  2 .
  6. With a scan tool, observe the stored information, capture info and DTC info. If there are any DTCs that are displayed by the scan tool and have not been diagnosed, go to the appropriate SELF-DIAGNOSTICS article under ENGINE PERFORMANCE. If there are no more codes, the system is OK.
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