Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
EXCESSIVE SHIFT SHOCK WHEN UPSHIFTING AND DOWNSHIFTING - DIAGNOSTIC PROCEDURE
| STEP |
INSPECTION |
ACTION |
| 1 |
|
Yes |
Go to next step. |
| No |
Repair or replace any defective parts according to inspection results. |
| 2 |
|
Yes |
Go to next step. |
| No |
Repair or replace any defective parts according to inspection results. |
| 3 |
- Inspect for abnormal signal change at the following TCM terminals while upshifting or downshifting:
- Throttle position sensor signal (TCM terminal U)
- Output speed sensor (TCM terminals AE and AF)
- Input/turbine speed sensor signal (TCM terminals W and Z)
- Are all signals okay?
|
Yes |
Go to next step. |
| No |
Inspect related wiring harness and sensor for intermittent open or short circuit. |
| 4 |
|
Yes |
- Inspect for continuity between appropriate shift solenoid terminal and appropriate TCM terminal.
- If okay, overhaul control valve body and repair or replace any defective parts.
- If problem remains, replace or overhaul transmission and repair or replace any defective parts.
|
| No |
Replace shift solenoid. |
| 5 |
- Verify test results.
- If okay, return to diagnostic index to service any additional symptoms.
- If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
- If vehicle is repaired, troubleshooting completed.
- If vehicle is not repaired or additional diagnostic information is not available, replace TCM.
|