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Test No. 7: Vehicle Speed Varies With Cruise Control Set

WARNING: This page is about a different car, the 2001 Mitsubishi Eclipse. However, it is still accessible from the selected car via links, so may be relevant.
  1. Check vehicle speed sensor. See VEHICLE SPEED SENSOR TEST  under COMPONENT TESTS. Replace as necessary. If sensor is okay, go to next step.
  2. Check cruise control vacuum pump. See VACUUM PUMP TEST  under COMPONENT TESTS. Replace as necessary. If cruise control pump is okay, check actuator. See ACTUATOR TEST  under COMPONENT TESTS. Replace as necessary. If actuator is okay, replace cruise control ECU.
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