Diagnostic List for Convertible Tops

Diagnostic list for convertible tops






1. Note the diagnostic trouble codes (DTCs) in the table below.





2. Note the present values in the table below.





3. Operate the motors one by one using "Volvo Scan Tool (ST)". Operate the convertible top motor and the motor for the rear catch to the mechanical stop positions. Note the values at these positions.





4. Use the above. Compare the programmed values with the limit positions obtained for both the potentiometers.
(Use the values from the 4th column in section 2 and the second column in section 3)

Compare:
- A with a
- B with b
- E with c
- F with d.
If one value deviates more than another and there is no mechanical wear or obstruction, the corresponding potentiometer must be replaced.
5. Subtract A from B (=W), E from F (=X), a from b (=Y) and c from D (=Z). Fill in the values below.
(Use the values from the 4th column in section 2 and the second column in section 3)





Compare W with Y, and X with Z. If the compared values deviate by more than 1, the corresponding potentiometer must be replaced.
6. Compare E with C, C must be at least two units larger than E. If it is not, the minimum position is calibrated too closely to the physical limit position of the rear catch. (This is the most frequent cause of diagnostic trouble code (DTC) 315).
(Use the values from the 4th column in section 2 and the second column in section 3)
7. If the potentiometer was found to be faulty, measure the resistance between leg 1 and 3 on the potentiometer (disconnected) and note the value here. ______ Ohms.
8. These are only guidelines which may not lead to finding the fault, especially if it is intermittent. Use The DTC list below to locate the most probable fault.
9. The following is a list of the most frequent DTCs and the most common causes of DTCs. This is only intended as a guide and does not mean that fault-tracing is not to be carried out.