Step | Action | Value(s) | Yes | No | ||||||||||||||||||||||||||
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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. | ||||||||||||||||||||||||||||||
1 |
Important: Engine performance can greatly affect transmission performance. Ensure that the complaint is not the result of poor engine performance before continuing. Verify the customer complaint. Has the customer complaint been verified? | -- | -- | |||||||||||||||||||||||||||
2 |
Important: Many transmissions have default actions that take place once a DTC fault is detected. These actions may be interpreted as being a transmission concern. Has the Powertrain OBD System Check been performed? | -- | Go to Powertrain On Board Diagnostic (OBD) System Check (4.3L) or Powertrain On Board Diagnostic (OBD) System Check (5.7L) or Powertrain On Board Diagnostic (OBD) System Check (6.5L) or Powertrain On Board Diagnostic (OBD) System Check (7.4L) | |||||||||||||||||||||||||||
3 | Perform a visual inspection. Look for the following conditions:
Was an item identified that needs service? | -- | Go to the Appropriate Repair or Diagnosis Section | |||||||||||||||||||||||||||
4 | Perform the Transmission Fluid Check . Is the procedure complete? | -- | Go to Transmission Fluid Check | |||||||||||||||||||||||||||
5 | Perform the Road Test . Did the vehicle exhibit any objectionable performance condition? | -- | ||||||||||||||||||||||||||||
6 | Did the vehicle exhibit objectionable torque converter operation? | -- | ||||||||||||||||||||||||||||
7 | Did the vehicle produce any objectionable noise condition? | -- | Go to Symptom Diagnosis (Noise and Vibration Diagnosis) | |||||||||||||||||||||||||||
8 | Did the vehicle exhibit a vibration condition? | -- | ||||||||||||||||||||||||||||
9 | Did the vibration occur only during TCC apply or release? | -- | Go to Symptom Diagnosis (Noise and Vibration Diagnosis) | |||||||||||||||||||||||||||
10 | Did the vehicle exhibit a shift speed condition such as low or high shift speeds? | -- | Go to Symptom Diagnosis (Shift Speed Diagnosis) | |||||||||||||||||||||||||||
11 | Did the vehicle exhibit any of the following shift quality (feel) conditions?
| -- | ||||||||||||||||||||||||||||
12 | Perform the Line Pressure Check . Is the line pressure within specification? | -- | Go to Symptom Diagnosis (Shift Quality (Feel) Diagnosis) | Go to Symptom Diagnosis (Fluid Diagnosis) | ||||||||||||||||||||||||||
13 | Did the vehicle exhibit any of the following shift pattern conditions?
| -- | Go to Symptom Diagnosis (Shift Pattern Diagnosis) | |||||||||||||||||||||||||||
14 | Did the vehicle exhibit any of the following range performance conditions?
| -- | Go to Symptom Diagnosis (Range Performance Diagnosis) | System OK | ||||||||||||||||||||||||||
15 | Did the vehicle exhibit any of the following torque converter or TCC conditions?
Refer to Torque Converter Diagnosis . | -- | Go to Symptom Diagnosis (Torque Converter Diagnosis Procedure) | System OK | ||||||||||||||||||||||||||
