Mechanics

HELLO, EVERY TIME I TURN THE CRUISE CONTROL ON IT SPEEDS UP AND I CANT GET IT TO STAY AT A CONSTANT SPEED.

1999 Mazda Miata • 116,000 miles

When I hit the brakes it turns it off and I can drive just fine and it doesnt accelerate when I have the cruise control off. Thank you for your help!
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530man
September 9, 2012.



Start by checking for trouble codes.

Using Cruise Indicator Light

NOTE: If RESUME/ACCEL switch is malfunctioning, cruise indicator light will not provide a correct indication when cruise system is inspected. Use NGS tester procedure.

NOTE: On 2-digit output patterns, a short pause separates each digit of output pattern (example of output pattern 21: 2 long flashes, short pause, 1 short flash). If no output pattern is present, light will not flash.

1. Turn ignition switch to ON position. Ensure cruise control main switch is off. Press and hold RESUME/ACCEL switch then press cruise control main switch to activate system inspection. Cruise indicator light should illuminate.

2. Press SET/COAST switch. If output pattern 21 is retrieved, go to next step. If output pattern 21 is not retrieved, check cruise control switch circuit.

3. Press RESUME/ACCEL switch. If output pattern 22 is retrieved, go to next step. If output pattern 22 is not retrieved, check cruise control switch circuit.

4. Depress brake pedal. If output pattern 31 is retrieved, go to next step (A/T models) or step 6 (M/T models). If output pattern 31 is not retrieved, check brake switch circuit.

5. Place gear selector in Park or Neutral. If output pattern 35 is retrieved, go to step 7. If output pattern 35 is not retrieved, check transmission range switch circuit.
6. Depress clutch pedal. If output pattern 35 is retrieved, go to next step. If output pattern 35 is not retrieved, check clutch switch circuit.

7. Drive vehicle at a speed greater than 25 MPH. If output pattern 37 is retrieved, operation mode has passed. Perform condition detection mode. If output pattern 37 is not retrieved, check
vehicle speed sensor circuit.

KHLow2008
Sep 9, 2012.