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.
ECM Pin Test
1995 Mazda MX-3 L4-1598cc 1.6L DOHCSECTION ECM Pin Test
INSPECTION
1. Lift up the floormat in front of the passenger's seat.
2. Connect the special service tool (SST) (Engine Signal Monitor) between the engine control module (ECM) and the wiring harness using the SST (Adapter) as shown.
3. Place the SST (Sheet) on the SST (Engine Signal Monitor).
4. Measure the voltage at each terminal.
Refer to Computers and Control Systems/ ECM Terminal Voltage Charts.
5. If any ECM terminal voltage is incorrect, check the input or output device and related wiring.
6. If they are normal, replace the ECM.
CAUTION: Applying voltage to SST terminals A or B will damage the SST.
1. Lift up the floormat in front of the passenger's seat.
Connect Special Service Tools As Shown:
2. Connect the special service tool (SST) (Engine Signal Monitor) between the engine control module (ECM) and the wiring harness using the SST (Adapter) as shown.
View: Special Service Tool (SST)-Sheet Overlay:
3. Place the SST (Sheet) on the SST (Engine Signal Monitor).
4. Measure the voltage at each terminal.
Refer to Computers and Control Systems/ ECM Terminal Voltage Charts.
5. If any ECM terminal voltage is incorrect, check the input or output device and related wiring.
6. If they are normal, replace the ECM.
View: Special Service Tool:
CAUTION: Applying voltage to SST terminals A or B will damage the SST.
RENDER: 1.0x
NO RELATED
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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.