XJ-6 L6-3.6L (1989)
Cruise Control Module: Technical Service Bulletins
Cruise Control - Test For Revised System
CRUISE CONTROL TEST
JAGUAR DIAGNOSTIC SYSTEM
NO:
33
Model:
1989 XJ6 3.6 Date: SEPTEMBER, 1988
KEY POINTS:
SYSTEM TEST
Beginning with 1989 M.Y. (VIN 556851), XJ6 3.6 vehicles incorporate a revised cruise control system. The cruise control can now be operated in
second and third gear as well as drive. This has been achieved by replacing the auto cruise control relay with a logic module, (referred to us as the cruise
control continuity module). This unit maintains power to the cruise control system in drive, third, and second if each gear change is completed within a 3
second period.
JDS Software is not currently available to test the revised cruise control system. However, the following preliminary checks can be completed on JDS:
-
Check to see if the instrument pack gear position indicator operates correctly. If the indicator does not operate correctly, a fault in the gearbox
linear switch assembly may exist. (This may be tested using JDS via "Instrumentation").
-
If the gear position indicator operates correctly, test the operation of the cruise control system (in "Drive") using JDS.
-
If the JDS test provides a fault description of either "no fault found" or "auto cruise control relay", complete the tests on the following continuity
module:
^
Switch ignition "ON" (position II).
^
Test LB 115-4 (w/k) for normal battery voltage.
NOTE:
Normal battery voltage exists when voltage at test point is within .5V of voltage measured at battery terminals.
^
If normal battery voltage does not exist, the fault is due to an open circuit in the bulkhead harness.
^
If normal battery voltage does exist, test LB 115-6 (B) for a good ground connection.
NOTE:
A good ground connection or a short circuit exists when 15 ohms or less is measured between the test wire and ground.
^
If no ground fault exists, a bulkhead harness open circuit exists.
^
If a ground condition does exist on any of these pins, a bulkhead harness short circuit exists.
^
If any are not grounded, check LB 115-2 (P) for battery voltage.
^
If battery voltage does not exist, either a fuse 3, a bulkhead harness, or a brake switch fault exists.
^
Select "Park".
^
Test LB 115 pins 1 (S/R), 3 (S/Y), 7 (S/W), and 9 (S/U) for short circuit to ground.
^
If a ground condition exists on any of these pins, a bulkhead harness short circuit exists.
^
If all are not grounded, check LB 115-8 (P/W) for normal battery voltage.
^
If battery voltage does exist, a continuity module fault exists.
^
Select "Drive".
^
Test LB 115-3 (S/Y) for a short circuit to ground.
^
If ground does not exist, a bulkhead harness open circuit exists.
^
If ground does exist, test LB 115-8 (P/W) for battery voltage.
^
If no battery voltage exists, a continuity module fault exists.
^
Select 3rd gear.
