Diagnosis
FAULT DIAGNOSISNote:
When operating the top, the engine should be running to maintain maximum battery voltage.
Fault diagnosis is split into three sections, the most common top failures are listed under the section Preliminary Checks. The vehicle should be checked using this list before consulting the following sections. The second section Diagnosing Switch Faults deals with faults which occur when one of the microswitches malfunctions. The third section is a list of top failures and their possible causes. Refer to Fig. 15.2 of the XK8 Electrical Guide for an electrical schematic of the convertible top system.
Preliminary Checks
Listed below are the most common top failures:
^ Is the battery fully charged?
^ Is the top pump switched to automatic? - check that the manual operation valve on the side of the pump is turned fully clockwise.
^ Are all the relays correctly seated in the luggage compartment fuse box?
^ Check for blown fuses in the luggage compartment fuse box.
^ Are all the connectors including the orange and blue solenoid connectors secure and correctly fitted to the hydraulic pump?
^ If the top has been manually operated ensure it has been returned to the automatic condition.
^ If the mechanism claw is in the wrong position in comparison to the top's position, it is possible that the system's logic has become confused. The problem can be corrected by manually repositioning the claw, e.g.if the claw is in the raised position move it into the lowered position.
Diagnosing Switch Faults
Diagnosing Switch Faults:
Diagnosing Switch Faults:
Diagnosing Switch Faults:
To use the table, read down the relevant column until a box is found that describes the top malfunction. Once found, check that the description in the opposite box relates to the malfunction when the top is operated in the opposite direction. If both descriptions agree, then the problem is being caused by the listed switch or the harness/connectors linked to it. The described top malfunctions assume that the top operation is starting from either the fully raised and latched position or the fully lowered and latch retracted position. It is important that to successfully diagnose some failures that the main control switch is depressed for up to 35 to 40 seconds. This allows the program logic to achieve "time out" i.e. maximum time allowed for top opening or closing to complete its cycle.
Note:
Some switches have similar symptoms when the top is operated in one direction, but no two switches have the same failure problems in both directions: