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.
Testing - Preliminary Information
- NEUTRAL START SWITCH CIRCUIT chart.
- ECU POWER SOURCE CIRCUIT chart.
- BACK-UP POWER SOURCE CIRCUIT chart.
- INJECTOR CIRCUIT chart.
- COLD START INJECTOR CIRCUIT chart.
- IDLE SPEED CONTROL (ISC) VALVE CIRCUIT chart.
- FUEL SYSTEM CIRCUIT chart.
- FUEL PRESSURE CONTROL VACUUM SWITCHING VALVE (VSV) CIRCUIT chart.
- TERMINAL TE1 & TE2 CIRCUIT DIAGNOSIS chart.
- A/C COMPRESSOR CIRCUIT chart.
Refer to the following transmission diagnostic charts:
- MAIN THROTTLE POSITION SENSOR CIRCUIT chart.
- NEUTRAL START SWITCH CIRCUIT chart.
- STOPLIGHT CIRCUIT chart.
- PATTERN SELECT SWITCH CIRCUIT chart.
- O/D SWITCH & O/D OFF INDICATOR LIGHT CIRCUIT chart.
- O/D CANCEL SIGNAL CIRCUIT chart.
- DIAGNOSIS CIRCUIT chart.
- CHECK CONNECTOR CIRCUIT chart.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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