Diagnosis By Symptom

Diagnosis By Symptom





The Diagnosis by Symptom Index gives the technician diagnostic information, direction and suggests possible components, using a symptom as a starting point.

The Diagnosis by Symptom Index is divided into 2 categories: Electrical Routines, indicated by 200 series numbers and Hydraulic/Mechanical Routines, indicated by 300 series numbers. The Electrical Routines list the possible electrical components that could cause or contribute to the symptom described. The Hydraulic/Mechanical Routines list the possible hydraulic or mechanical components that could cause or contribute to the symptom described.


Diagnosis by Symptom Chart Directions

1. Using the Symptom Index, select the Concern/Symptom that best describes the condition.

2. Refer to the routine indicated in the Diagnosis by Symptom Index.

3. Always begin diagnosis of a symptom with:
a. Preliminary inspections.
b. Verifications of condition.
c. Checking the transmission fluid levels.
d. Carrying out other test procedures as directed.

4. NOTE: Not all concerns and conditions with electrical components will set a DTC. Be aware that the components listed may still be the cause. Verify correct function of these components prior to proceeding to the Hydraulic/Mechanical Routine listed.

NOTE: The PCM has an adaptive learn strategy to electronically control the transmission which will automatically adjust the shift feel. When the battery has been disconnected or a new battery installed, certain transmission operating parameters may be lost. The PCM must relearn these parameters. During this learning process slightly firm shifts, delayed or early shifts may occur. This operation is considered normal and will not affect the function of the transmission. Normal operation will return once these parameters are stored by the PCM.

Begin with the Electrical Routine, if indicated. Follow the reference or action required statements. Always carry out the On-Board Diagnostic (OBD) tests as required. Never skip steps. Repair as required. If the concern is still present after electrical diagnosis, then proceed to the Hydraulic/Mechanical Routine listed.

5. The Hydraulic/Mechanical Routines list possible hydraulic or mechanical components that could cause the concern. These components are listed in the removal sequence and by most probable cause. All components listed must be inspected to make sure of correct repair.


Diagnosis by Symptom Index










a Carry out electrical routines first. Diagnostic Routines