Operation CHARM: Car repair manuals for everyone.
Home >> Mazda >> 1997 >> Protege ES L4-1839cc 1.8L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> A/C Signal >> Testing and Inspection >> A/C Cut-Off Control Inspection
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A/C Cut-Off Control Inspection

A/C Cut-Off Control Inspection
1. Start the engine and let it idle.
2. Turn the A/C switch and the fan switch ON.
3. Fully open the throttle valve. Then 3-6 seconds after, check if the operation sound of the A/C compressor electromagnetic clutch is heard.
4. If the operation sound is not heard, do as follows.

Special Service Tool New Generation Star Tester Connected to Data Link Connector 2:




a. Connect the Special Service Tools New Generation Star (NGS) tester to the data link connector 2.




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" function and check for the operation sound of the relay.
a. If the operation sound is heard, check the PCM terminal voltage - Load/no load judgement signal - Throttle position signal.
b. If the operation sound is not heard, check the following.
- A/C relay
- Open circuit in wiring harnesses and connectors (Ignition switch - A/C relay - PCM)
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