Inspection Of Stoplight Switch; Inspection Of Actuator; Inspection Of Speed Sensor - Mazda MX-5 1990 Workshop Manual

d b
CRUISE CONTROL SYST.EM
T
-
05UOTX-217
05UOTX-218
05UOTX-332
Step 7 - Inspection of stoplight switch
1. Disconnect the stoplight switch.
2. Check continuity between terminals of the switch.
Pedal position
Terminal
a b
Pedal released
Pedal depressed 0- -0
0 - 0 : Indicates continuity
3. If not as specified, replace the stoplight switch.
4. If the siwtch is OK, repair the wire harness. (Cruise control
unit - Stoplight switch)
Step 8 - Inspection of actuator
1. Measure the actuator solenoid resistance using an
ohmmeter.
Check terminals Resistance
c-a
c-b Approx. 25 to 550
c-d
2. If not as specified, replace the actuator.
3. If continuity is OK, go to Step 8-4.
4. Disconnect the actuator cable from the accelerator pedal.
5. Run the engine at idle speed.
6. Apply 12V to the following terminals, and check actuator
operation.
Order
Terminal condition
a b c d
1
Ground Ground
Power Ground
2 Ground
-
Power Ground
3 Ground
-
Power
-
4
- - - -
7. If not as specified, replace the actuator.
Step 9 - Inspection of speed sensor
1. Remove the iq,strument cluster.
Operation of
control cable
Pull
Hold
Extend
Release
2. Check continuity between terminals 20 and 2F while rotat-
ing the speedometer cable.
3. If there are not four pulses per shaft rotation, replace the
speed sensor. (Refer to page T -33.)
4. If there are four pulses per rotation, check the wire harness
(Instrument cluster - Control unit).
5. If the wiring is OK, replace the cruise control unit.
T-101