Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 77 (CRUISE CONTROL SYSTEM)DIAGNOSTIC TESTSDTC 21: CRUISE CONTROL SWITCH (SET/COAST SWITCH)
1999 Mazda 626 ES, 2.5 D, Standard
DTC 21: Cruise Control Switch (Set/Coast Switch)
1999 Mazda 626 ES, 2.5 D, StandardSECTION DTC 21: Cruise Control Switch (Set/Coast Switch)
WARNING: This page is about a different car, the 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- Access cruise control module, located behind right kick panel. Disconnect cruise control module harness connector. Measure resistance between ground and terminal "L" ( Violet wire) at cruise control module harness connector while depressing SET/COAST switch. See Figure . If resistance is 198 ohms, system is okay. If resistance is not 198 ohms, go to next step.
- Remove column cover. Turn ignition switch to ON position. Press cruise control main switch to ON position. Turn SET/COAST to ON position. Using a DVOM, measure voltage at clockspring connector No. 2, terminal 2C (Violet wire). See Figure . If voltage is 2.5 volts, replace cruise control module. If voltage is not as specified, replace cruise control switch.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.