What gear should the TCC slip test be performed in?

The procedure is performed in 2nd gear auto (not manual 2). Monitor TC SLIP ACT after the PCM commands 2nd gear and before the VSS reads 35 mph (56 km/h).

Is it normal for the transmission to shift into 4th gear at low speed?

Yes, the document states it is normal for the PCM to command 4th gear at speeds as low as 19 mph (30 km/h) with light acceleration when the throttle position is less than 20%.

What should I do if I get a different reading during the test?

If you receive any other reading, this procedure does not apply; follow normal diagnostic procedures as outlined in the appropriate WSM (Workshop Manual).

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Ford/Mercury TCC Lockup Diagnostic TSB Pt 2 - Parts List & Valve Body Gaskets

Service bulletin page with procedure notes and parts information table

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Service-documentation page with shift procedure notes and a parts table listing ball check and valve body gaskets.

AI caption December 2015 · Photo 2743 of 2796

This document is a partial page from an automotive service bulletin or workshop manual procedure related to a torque converter clutch (TCC) lockup diagnostic. It includes a procedural note stating that the test is performed in 2nd gear auto (not manual 2), and that the technician should monitor the TC SLIP ACT parameter after the Powertrain Control Module (PCM) commands 2nd gear and before the Vehicle Speed Sensor (VSS) reads 35 mph (56 km/h). A step (b) advises that if any other reading is received, the procedure does not apply and normal diagnostic procedures per the appropriate Workshop Manual (WSM) should be followed. A second note indicates it is normal for the PCM to command 4th gear at speeds as low as 19 mph (30 km/h) under light acceleration when throttle position is less than 20%. The page concludes with a Parts Information table listing three parts: Ball Check (EOAZ-7E195-B), Gasket – Valve Body Upper (1L3Z-7C155-AA), and Gasket – Valve Body Lower (1W7Z-7D100-AB). This appears to be page 2 of a multi-page TCC lockup issue document filed for a 2000 Mercury Grand Marquis.

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Frequently asked questions

What gear should the TCC slip test be performed in?: The procedure is performed in 2nd gear auto (not manual 2). Monitor TC SLIP ACT after the PCM commands 2nd gear and before the VSS reads 35 mph (56 km/h).
Is it normal for the transmission to shift into 4th gear at low speed?: Yes, the document states it is normal for the PCM to command 4th gear at speeds as low as 19 mph (30 km/h) with light acceleration when the throttle position is less than 20%.
What parts are listed for this repair?: Ball Check (EOAZ-7E195-B), Gasket – Valve Body Upper (1L3Z-7C155-AA), and Gasket – Valve Body Lower (1W7Z-7D100-AB).
What should I do if I get a different reading during the test?: If you receive any other reading, this procedure does not apply; follow normal diagnostic procedures as outlined in the appropriate WSM (Workshop Manual).