Mazda MX-5 NA silhouetteMX-5 NA

CRUISE CONTROL SYSTEM

T-101prose procedure
Continued from T-100

Step 7 — Inspection of stoplight switch

  1. 1
    Disconnect the stoplight switch.
    Illustration of brake pedal area with stoplight switch connector being disconnected by hand, with a separate connector pinout showing terminals 'a' and 'b'.
    05U0TX-217
  2. 2
    Check continuity between terminals of the switch.
  3. 3
    If not as specified, replace the stoplight switch.
  4. 4
    If the siwtch is OK, repair the wire harness. (Cruise control unit — Stoplight switch)

Stoplight switch continuity

Pedal released
a
b
Pedal depressed
aO——————O
b

Step 8 — Inspection of actuator

  1. 1
    Measure the actuator solenoid resistance using an ohmmeter.
    Illustration of cruise control actuator being inspected with an ohmmeter test lead, with a 4-terminal connector pinout showing 'c a' / 'd b' layout.
    05U0TX-218
  2. 2
    If not as specified, replace the actuator.
  3. 3
    If continuity is OK, go to Step 8—4.
  4. 4
    Disconnect the actuator cable from the accelerator pedal.
  5. 5
    Run the engine at idle speed.
  6. 6
    Apply 12V to the following terminals, and check actuator operation.
    Illustration of cruise control actuator with battery and test wires applied to terminals, with the 4-terminal connector pinout 'c a' / 'd b'.
    05U0TX-332
  7. 7
    If not as specified, replace the actuator.

Actuator solenoid resistance

c — a
ResistanceApprox. 25 to 55Ω
c — b
ResistanceApprox. 25 to 55Ω
c — d
ResistanceApprox. 25 to 55Ω

Actuator 12V application test

1
aGround
bGround
cPower
dGround
Operation of control cablePull
2
aGround
b—
cPower
dGround
Operation of control cableHold
3
aGround
b—
cPower
d—
Operation of control cableExtend
4
a—
b—
c—
d—
Operation of control cableRelease

Step 9 — Inspection of speed sensor

  1. 1
    Remove the instrument cluster.
    Instrument cluster rear view showing speedometer cable connection and terminals 2D and 2F highlighted for speed sensor inspection.
    05U0TX-219
  2. 2
    Check continuity between terminals 2D and 2F while rotating the speedometer cable.
  3. 3
    If there are not four pulses per shaft rotation, replace the speed sensor. (Refer to page T-33.)
  4. 4
    If there are four pulses per rotation, check the wire harness (Instrument cluster — Control unit).
  5. 5
    If the wiring is OK, replace the cruise control unit.
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See also

T-33INSTRUMENT CLUSTER

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