The Functional Test Procedure is the first step in diagnosing mechanical or hydraulic transmission conditions. The Functional Test Procedure provides procedures and references to the symptom diagnosis table for specific diagnostic information.

Important: Engine performance can strongly affect transmission performance. Ensure the condition is not the result of poor engine performance before continuing.

Verify the customer concern.

Has the customer concern been verified?

Go to Step 2

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Important: Many transmissions have default actions that take place once a DTC fault is detected. These actions may appear to be transmission concerns.

Perform the Diagnostic System Check - Vehicle .

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 3

Go to Diagnostic System Check - Vehicle

Inspect for the following conditions:

Did you find a condition?

Go to the appropriate repair or diagnosis section

Go to Step 4

Perform the Transmission Fluid Check .

Did you perform the Transmission Fluid Check ?

Go to Step 5

Go to Transmission Fluid Check

Perform the Road Test .

Did the vehicle exhibit any objectionable performance condition?

Go to Step 6

Go to Step 1

Did the vehicle exhibit objectionable torque converter operation?

Go to Step 15

Go to Step 7

Did the vehicle produce any objectionable noise condition?

Go to Symptoms - Automatic Transmission

Go to Step 8

Did the vehicle exhibit a vibration condition?

Go to Step 9

Go to Step 10

Did the vibration occur only during torque converter clutch (TCC) apply or release?

Go to Step 15

Go to Symptoms - Automatic Transmission

Did the vehicle exhibit a shift speed condition, such as low or high shift speeds?

Go to Symptoms - Automatic Transmission

Go to Step 11

Inspect for the following unacceptable shift qualities:

Did the vehicle exhibit any of these shift quality conditions?

Go to Step 12

Go to Step 13

Perform the Line Pressure Check .

Is the line pressure within specification?

Go to Symptoms - Automatic Transmission

Go to Symptoms - Automatic Transmission

Inspect for the following unacceptable shift pattern conditions:

Did the vehicle exhibit any of these shift pattern conditions?

Go to Symptoms - Automatic Transmission

Go to Step 14

Inspect for the following unacceptable range performance conditions:

Did the vehicle exhibit any of these range performance conditions?

Go to Symptoms - Automatic Transmission

System OK

Inspect for the following specific torque converter conditions or TCC conditions:

Did the vehicle exhibit any of these torque converter or TCC conditions?

Go to Torque Converter Diagnosis

System OK