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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSMAZDA1997MILLENIA V6-2.5L DOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSA/C SIGNALTESTING AND INSPECTIONA/C CUT-OFF CONTROL SYSTEM
1997 Mazda Millenia V6-2.5L DOHC
A/C Cut-Off Control System
1997 Mazda Millenia V6-2.5L DOHCSECTION A/C Cut-Off Control System
SYSTEM INSPECTION
1. Position the vehicle on a chassis roller and start the engine.
2. Shift the selector lever into other than P and N.
3. Turn the A/C switch and the fan switch on.
4. Fully open the throttle valve. Then, 3-6 seconds after, check if the operation sound of the A/C compressor electromagnetic clutch is heard.
5. If the operation sound is not heard, do as follows.
A Connect the Special Service Tools New Generation Star (NGS) tester.
B Select the SIMULATION TEST function on the NGS display.
C Turn the A/C relay from OFF to ON by using the "A/C RLY" and check for the operation sound of the relay.
I. If the operation sound is heard, check the following.
- PCM terminal voltage
- Load/no load distinction signal
- Closed throttle position signal
II. If the operation sound is not heard, check the following.
- A/C relay
- Open circuit in wiring harnesses and connector (Main relay - A/C relay - PCM)
1. Position the vehicle on a chassis roller and start the engine.
2. Shift the selector lever into other than P and N.
3. Turn the A/C switch and the fan switch on.
4. Fully open the throttle valve. Then, 3-6 seconds after, check if the operation sound of the A/C compressor electromagnetic clutch is heard.
5. If the operation sound is not heard, do as follows.
A Connect the Special Service Tools New Generation Star (NGS) tester.
B Select the SIMULATION TEST function on the NGS display.
C Turn the A/C relay from OFF to ON by using the "A/C RLY" and check for the operation sound of the relay.
I. If the operation sound is heard, check the following.
- PCM terminal voltage
- Load/no load distinction signal
- Closed throttle position signal
II. If the operation sound is not heard, check the following.
- A/C relay
- Open circuit in wiring harnesses and connector (Main relay - A/C relay - PCM)
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.