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.
Switch Monitor Test
Perform this test if no code is present after performing KOEO and KOER self-tests. Switch monitor tests determine if electrical signals to the ECA from input devices are correct. In this procedure, each device is tested individually. Perform test with SUPER STAR II tester or Analog Volt-Ohmmeter (VOM).
| Switch | SUPER STAR II/VOM Indication | (1) Circuit Test | ||||
|---|---|---|---|---|---|---|
| Clutch Engage/Neutral Gear Switch (2) | LED on/1.5 Volts; transaxle in gear, clutch pedal released | STG | ||||
| Manual Lever Position Switch | LED on/1.5 Volts; transaxle in Park or Neutral | STP | ||||
| Idle Switch | LED on/1.5 Volts; accelerator pedal depressed | STG | ||||
| Brake On/Off Switch | LED on/1.5 Volts; brake pedal partially depressed | STP | ||||
| Headlight Switch | LED on/1.5 Volts; headlight switch on | STP | ||||
| Blower Motor Switch | LED on/1.5 Volts; switch set at 2 or more | STG | ||||
| A/C Switch | LED on/1.5 Volts; A/C & blower switch on | STG | ||||
| Defrost Switch | LED on/1.5 Volts; defrost switch on | STP | ||||
| Coolant Temp. Switch | LED on/1.5 Volts; cooling fan on | STP | ||||
| Wide Open Throttle Switch | LED on/1.5 Volts; accelerator pedal fully depressed | STG | ||||
| Knock Control | LED on/1.5 Volts; while tapping on engine | KC | ||||
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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.
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