1993 Mazda 626 Component Diagnosis & Testing
1. Turn ignition switch and cruise control main switch to On position. 2. Ensure main switch indicator lamp illuminates. If lamp does not illuminate, check continuity between terminals of cruise control main switch, Fig. 16 through 19 . If switch operates correctly, repair wire harness. 3. Measure voltage at following terminals of the control unit, Fig. 20 through 25 . If terminal voltage are correct, replace cruise control unit. 4. Disconnect cruise stop lamp and clutch switches and ensure continuity exists between terminals only with pedal depressed. 5. If switches operate correctly, repair wiring to switches. 6. Check for continuity between terminals of cruise control switch, Fig. 26 through 29 .
If switch operates correctly, repair wire harness. 7. Disconnect stop lamp switch and ensure continuity exists betweenterminals only with pedal released. 8. Measure actuator solenoid resistance using an ohmmeter, Fig. 30 through 33 . If continuity is not as specified, replace actuator. 9. If continuity is as specified, disconnect actuator cable, start engine and run at a idle. 10. Apply battery voltage to terminals shown in Fig. 34 through 36 , and check actuator operation. If not as specified, replace actuator. 11. Remove instrument cluster as described in appropriate chassis section. 12. Connect an ohmmeter between the following terminals on the 12-pin connector: a. On Miata models, connect between terminals 2F and 2D. b. On 1993-95 MPV models , connect between terminals 1J and 2A. 13. Ensure intermittent continuity betweenterminals while rotating speedometer cable shaft. If four times per rotation, replace speedometer.
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