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.
Mazda6 (2.3L)
- Resistance Inspection
Disconnect negative battery cable. Disconnect throttle body 6-pin harness connector. Using DVOM, measure resistance between throttle actuator terminals "E" and "F". See Fig 1. If resistance reading is .3-100 ohms, check for open or short circuit. Go to next step. If resistance reading is not as specified, replace throttle body. - Open Circuit Inspection
Disconnect PCM 30-pin harness connector. Check for continuity between following terminals:- Throttle actuator 6-pin harness connector terminal "E" (Black wire) and PCM 30-pin harness connector terminal No. 4AB (Blue/White wire) through common connector.
- Throttle actuator 6-pin harness connector terminal "F" (White/Green wire) and PCM 30-pin harness connector terminal No. 4Y (Blue/Black wire) through common connector.
If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.
- Short Circuit Inspection
Check for continuity between following:- Throttle actuator 6-pin harness connector terminal "E" (Blue/White wire) and power supply.
- Throttle actuator 6-pin harness connector terminal "E" (Blue/White wire) and ground.
- Throttle actuator 6-pin harness connector terminal "F" (White/Green wire) and power supply.
- Throttle actuator 6-pin harness connector terminal "F" (White/Green wire) and ground.
If continuity is present, repair short circuit in suspect wire or replace wire harness.
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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.