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Home >> Mazda >> 1997 >> MX-6 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

NOTE: Basic idle speed/ignition timing adjustments are not necessary.

Preparation
1. Warm up the engine to normal operating temperature.
2. Shift the selector lever to P range.
3. Turn off all electrical loads.
- Headlight
- Blower
- Rear window defroster
- Power steering
4. Wait until the cooling fan stops.




5. Connect the Special Service Tool (SST) New Generation Star (NGS) tester to the data link connector 2 and select the "PID/DATA MONITOR AND RECORD" function.

Idle Speed

CAUTION: The throttle adjusting screw is set at the factory and must not be adjusted. Any adjustment will negatively effect the engine performance.

1. Using the NGS verify that the idle speed is within the specification.

Idle speed (P range): 650-750 (700 ± 50) rpm

2. If not within the specification, race the engine and operate the A/C with no load.
3. Stop racing the engine and the A/C, and check the idle speed.

NOTE: Using by NGS tester any DTC must be cleared when you reconnect the IAC valve connector.

4. Idle speed below the specification
Disconnect the IAC valve connector and check the engine speed.
(1) If the engine speed does not change, inspect the IAC solenoid valve.
(2) If the engine speed changes excessively (due to engine stall), inspect the Powertrain Control Module (PCM) and IAC solenoid valve related wiring harness and connectors.

5. Idle speed over the specification
Disconnect the IAC valve connector and check the engine speed.
(1) If the engine speed does not change, adjust with the air adjusting screw.

Idle speed (P range): 650-750 (700 ± 50) rpm

(2) If the engine speed changes excessively, inspect the PCM and related wiring harnesses and connectors.

Idle-up Speed
1. Perform Preparation.
2. Verify that the idle speed is within the specification.

Specification: 650-750 (700 ± 50) rpm

3. If not within the specification, adjust the idle speed.
4. Check the idle speed with the following load conditions.




NOTE: Excludes temporary idle speed drop just after the electrical loads are turned ON.

5. If not as specified with all load conditions, inspect the idle air control valve.
If not as specified with any one of load conditions, check related input switches, harnesses and connectors.
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