95 1/2 Model

This Diagnostic Trouble Code (DTC) flashes the "CHECK TRANS" Indicator and sets the Backup Mode.

Circuit Description
- The Transmission Control Module (TCM) is calculating the slippage of the Converter and Transmission based upon the Engine Speed, the Output Speed and the current Gear ratio.
- The slippage of the Converter at a high enough Engine speed is low. Then the Transmission should not slip more than a given value when there is no shift.

Diagnostic Aids
- This diagnostic is not an electrical test done by the TCM but a test between different information ("logic test").

- Detection Conditions:
a. Engine speed is more than 3500 rpm.
b. Using the ratio of the current gear the Converter slippage is calculated based upon the Engine speed and the output speed. This slippage must be more than:
528 rpm in 4th Gear
536 rpm in 3rd Gear
556 rpm in 2nd Gear
595 rpm in 1st Gear

c. No malfunction: Engine Speed (DTC 13) Output Speed (DTC 11). Downshift Protection (DTC 62).
d. The last change of Shift Solenoid was more than 3 seconds ago.
e. The conditions need to be present for at least 5.5 seconds.

- Action After The Detection Time:
- Backup Mode.

- Recovery Conditions:
- To recover do an Ignition Cycle.

NOTE: The Torque Converter Clutch (TCC) slip data is a calculated value, and not an accurate one. This value should be used to see if the TCC is engaged or not.





DTC 61 / Flow Chart