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Home >> Mazda >> 2001 >> Protege MP3 L4-2.0L DOHC >> Repair and Diagnosis >> Powertrain Management >> Tune-up and Engine Performance Checks >> Idle Speed >> Testing and Inspection
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Idle Speed: Testing and Inspection

ENGINE TUNE-UP [FS]
Engine Tune-up Preparation
1. Warm up the engine to normal operating temperature.
2. Shift the transaxle into neutral.
3. Turn off all electrical loads.
- Headlight switch
- Fan switch
- Rear window defroster switch
- A/C switch
4. Verify that the steering wheel is at straight ahead position.





5. Connect the SSTs (WDS or equivalent) to the - DLC-2.
6. Access RPM PID.
7. Wait until the electrical fan stops.

Idle-up Speed Inspection
1. Perform "Engine Tune-up Preparation".
2. Connect the SST (System selector) to the DLC.
3. Set switch A to position 1.
4. Set the test switch to SELF TEST.
5. Verify that the idle speed is normal.
6. Verify that the RPM PID is within the specification.
- If not as specified with all load conditions, inspect the IAC valve.
- If not as specified with some load condition, inspect the related input switches, harnesses, and connectors.





Specification
*1 Excludes temporary idle speed drop just after the electrical loads (E/L) are turned on.
*2 Headlight is on, Fan switch is above 1st, Cooling fan is operating, Rear window defroster is on.
*3 Steering wheel is fully turned.
*4 A/C switch and fan switch are on.
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