Circuit/System Testing
WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
- Perform the Transmission Fluid Check
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- Correct the transmission fluid level if the fluid is not at the proper level.
- Using the scan tool, clear the DTC. If DTC P0742 was set, operate the vehicle greater than 72 km/h (45 mph) and use the scan tool to command the TCC ON. Observe the TCC Slip Speed parameter on the scan tool. The TCC Slip Speed should be below 60 RPM.
- If the TCC Slip Speed is greater than 60 RPM, inspect the following components and repair or replace as necessary:
- The cooling system for plugging
- The cooling lines may be pinched
- The TCC control valve for sticking
- The TCC regulator valve for sticking
- The pressure regulator valve
- The TCC PWM solenoid valve stuck and O-ring seal for leaks
- The TCC blowoff valve or spring for damage or not seating
- The TCC signal orifice in the spacer plate plugged
- The #1 check ball missing or leaking
- The spacer plate gaskets torn or leaking
- The turbine shaft seals for leaks
- The torque converter clutch
- If the TCC Slip Speed is greater than 60 RPM, inspect the following components and repair or replace as necessary:
- Using the scan tool, clear the DTC. If DTC P0752 or P0757 is set, drive the vehicle to ensure the TCM commands 1st, 2nd, 3rd, and 4th gears. The ratios should match the commanded gear for all gears.
- If the gear ratios do not match the commanded gear, inspect the following and repair or replace as necessary:
P0752
- The 1-2 shift solenoid mechanically stuck
- A stuck or binding 1-2 shift valve
- Damaged seals on the shift solenoid valve
P0757
- The 2-3 shift solenoid mechanically stuck
- A stuck or binding 2-3 shift valve
- Damaged seals on the shift solenoid valve
- If the gear ratios do not match the commanded gear, inspect the following and repair or replace as necessary: