Base Idle Speed Adjustment

Notes:
- Idle speed was adjusted by the manufacturer. There should be no need for readjustment--unless the original setting has been tampered with.
- Verify proper engine operation--spark plugs, injectors, idle air control motor, compression pressure are all normal prior to adjusting idle speed.

1. The vehicle should be prepared as follows before the inspection and adjustment.
- Engine coolant temperature: 85-95°C (185-205°F)
- Lights, electric cooling fan and accessories: OFF
- Transaxle: Neutral (P for vehicles with an automatic transaxle)

2. Connect a scan tool to the data link connector.

Note: When scan tool is connected, the diagnostic test mode control terminal is grounded.

3. If a scan tool is not used, follow the steps below.

a. Insert a paper clip (from the harness side) into the 1-pin connector shown in the figure at the left.
b. Connect a primary-voltage-detection type of tachometer to the paper clip.

Note: For rpm, one-half of the actual engine rpm is indicated, so the actual engine rpm in two times the indicated value shown by the tachometer.

c. Use a jumper wire to ground the diagnostic test mode control terminal of the data link connector.









4. Use a jumper wire to ground the terminal for adjustment of ignition timing.
5. Start the engine and let it idle.
6. Check the standard idling rpm.

Basic idle speed: 750 +/- 50 rpm

Notes:
- The engine speed may be 20 to 100 rpm lower than indicated above for a new vehicle [driven approximately 500 km (300 miles) or less], but no adjustment is necessary.
- If the engine stalls or the rpm is low even though the vehicle has been driven approximately 500 km (300 miles) or more, it is probable that deposits are adhered to the throttle valve, so clean it.

7. If not within the standard value range, turn the engine speed adjusting screw to make the necessary adjustment.

Note: If the idle cannot be adjusted under 800 rpm, check for indications that the CTP switch (fixed SAS) has been moved.
- If there is any indication that it has been moved, adjust the CTP switch (fixed SAS).
- If there are no indications that it has been moved, it is possible that there is leakage as a result of deterioration of the fast idle air valve (FIAV), if so, the throttle body should be replaced.

8. Switch OFF the ignition switch.
9. If a scan tool was not used, disconnect the jumper wire from the diagnostic test mode control terminal.
10. Disconnect the jumper wire from the terminal for adjustment of ignition timing, and return the connector to its original condition.
11. Start the engine and let it run at idle speed for about ten minutes; verify normal idle operation.