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.
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HOMESERVICE MANUALSMAZDA2001626 ES V6-2.5L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSA/C SIGNALTESTING AND INSPECTION
2001 Mazda 626 ES V6-2.5L DOHC
A/C Signal: Testing and Inspection
2001 Mazda 626 ES V6-2.5L DOHCSECTION Testing and Inspection
1. Start the engine and let it idle.
2. Turn the A/C switch and the fan switch ON.
3. Check if the operation sound of the A/C compressor electromagnetic clutch is heard. (A/C compressor starts to work.)
4. Fully open the throttle valve. Check if the operation sound the A/C compressor magnetic clutch is heard. (A/C compressor stops to work.) Then, 3 - 6 seconds after, check if the operation sound of the A/C compressor electromagnetic clutch is heard.
5. Turn the A/C switch and the fan switch OFF.
6. If the operation sound is not heard, do as follows.
1. Connect a jumper wire between both terminals of A/C pressure switch connector.
2. Turn the ignition switch ON.
3. Turn the A/C switch and the fan switch ON. Verify that operation sound is heard from A/C relay.
4. If the operation sound is heard, check the following PID using NGS tester.
- TP V PID.
- A/C related parts.
5. If the operation sound is not heard, check the following.
- A/C relay.
- Open or short to ground circuit in wiring harnesses and connectors (Main relay - A/C relay - PCM terminal 69)
2. Turn the A/C switch and the fan switch ON.
3. Check if the operation sound of the A/C compressor electromagnetic clutch is heard. (A/C compressor starts to work.)
4. Fully open the throttle valve. Check if the operation sound the A/C compressor magnetic clutch is heard. (A/C compressor stops to work.) Then, 3 - 6 seconds after, check if the operation sound of the A/C compressor electromagnetic clutch is heard.
5. Turn the A/C switch and the fan switch OFF.
6. If the operation sound is not heard, do as follows.
1. Connect a jumper wire between both terminals of A/C pressure switch connector.
2. Turn the ignition switch ON.
3. Turn the A/C switch and the fan switch ON. Verify that operation sound is heard from A/C relay.
Step 1 - 5:
4. If the operation sound is heard, check the following PID using NGS tester.
- TP V PID.
- A/C related parts.
5. If the operation sound is not heard, check the following.
- A/C relay.
- Open or short to ground circuit in wiring harnesses and connectors (Main relay - A/C relay - PCM terminal 69)
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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.