Idle Speed: Testing and Inspection

CAUTIONENGINE TUNE-UP
Engine Tune-up Preparation
1. Warm up the engine to normal operating temperature.
2. Shift transmission into Neutral (MT) or P position (AT).
3. Turn off all electrical loads.
- Headlight
- Blower
- Rear window defroster
4. Verify that the battery is fully charged.
5. Wait until the electrical fan stops.





6. Connect the NGS tester to the DLC-2 and select the "PID/DATA MONITOR AND RECORD" function and press TRIGGER.
7. Select "RPM" and press TRIGGER.





8. If using the SST (System selector) to turn on the test mode, perform as follows:
1. Connect the SST to the DLC.
2. Set switch A to position 1.
3. Set the test switch to SELF TEST.

CAUTION: Connecting the wrong DLC terminal may possibly cause a malfunction. Carefully connect the specified terminal only.





9. If using a jumper wire to turn on the test mode, perform the following:
1. Short the DLC terminal TEN to body GND using a jumper wire.
10. Select "START" to begin.

Idle-up Speed Inspection
1. Perform "Engine Tune-up Preparation"(above), "Idle Speed Adjustment". (refer to Adjustments)
2. Verify "RPM" PID is selected.
3. Press "START'.
4. Verify that the idle speed is normal.
5. Verify that the idle-up speed is within the specification.
- If not as specified with all loads conditions, inspect the IAC valve.





- If not as specified with some load conditions, inspect related input switches, harnesses and connectors.
*1:Excludes temporary idle speed drop just alter the electrical loads (E/L) are turned on.
*2:Headlight is on, fan switch (above 1st), cooling fan are operating, rear window defroster is on.
*3:Steering wheel is fully turned.
*4:A/C switch and fan switch are on.