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

Important: Engine performance can greatly affect transmission performance. Ensure that 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 be interpreted as being a transmission condition.

Did you perform the Diagnostic System Check - Automatic Transmission ?

Go to Step 3

Go to Diagnostic System Check - Automatic Transmission

Perform a visual inspection.

Inspect for the following conditions:

Did you identify an item that needs service?

Go to the appropriate Repair or Diagnosis section

Go to Step 4

Perform the Transmission Fluid Check .

Did you perform the Transmission Fluid Checking Procedure?

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 Noise and Vibration Diagnosis

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 Noise and Vibration Diagnosis

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

Go to Symptoms - Automatic Transmission Shift Speed Diagnosis

Go to Step 11

Did the vehicle exhibit any of the following shift quality, feel, 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 Shift Quality - Feel Diagnosis

Go to Symptoms - Automatic Transmission Fluid Diagnosis

Did the vehicle exhibit any of the following shift pattern conditions?

Go to Symptoms - Automatic Transmission Shift Pattern Diagnosis

Go to Step 14

Did the vehicle exhibit any of the following range performance conditions?

Go to Symptoms - Automatic Transmission Range Performance Diagnosis

System OK

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

Refer to Torque Converter Diagnosis .

Go to Symptoms - Automatic Transmission Torque Converter Diagnosis

System OK