Idle Speed - Adjustment Procedure
89hyundai02Group:
ENGINE
Number:
005
Date:
MARCH 1989
Model:
SONATA
Subject:
IDLE SPEED ADJUSTMENT PROCEDURE
Sonata engine idle speed generally will not require adjustment. However, if the curb idle is not within specification (750 +/- 100 rpm), the following procedure must be followed. Failure to do so may result in an unstable idle speed and failure of the idle speed motor position sensor.
Before adjusting the idle speed the following conditions must be present:
^ Engine coolant temperature must be 80 to 95~C (176 to 203~F).
^ Engine lubricant temperature must be over 80~C (176~F).
^ Lights, electric cooling fan and all accessories must be off.
^ Transmission must be in neutral ["P" or "N" range for A/T vehicles].
^ Steering wheel must be in the straight forward position.
1. Loosen the accelerator cable adjustment bolts as shown.
2. Use the Multi-Use Tester (MUT) if available. Connect the MUT to the diagnosis connector in the fuse box and the cigarette lighter.
3. If the MUT is not used, connect a voltmeter between terminals 2 and 3 of the throttle position sensor as shown.
NOTE:
1) Do not disconnect the TPS connector from the throttle body.
2) A digital voltmeter should be used.
4. Turn the ignition switch ON, but do not start the engine. Leave on for at least 30 seconds to fully retract the idle speed control (ISC) motor.
5. Turn the ignition switch OFF.
6. Disconnect the ISC motor connector.
7. Loosen the fixed SAS so that it does not contact the throttle lever.
8. Start the engine and run at idle speed. Open and close the throttle 2 or 3 times to insure that the engine idle speed is stabilized.
9. Check that the engine rpm is within specification. If the MUT is used, use code No. 22 and read engine rpm.
Curb idle rpm..........750 +/- 100 rpm
10. If the engine speed is not as specified, adjust the ISC adjusting screw to obtain the specified RPM.
11. Tighten the fixed SAS until the engine speed starts to increase. Then, loosen it until the engine speed ceases to drop (touch point) and then loosen a half turn from the touch point.
12. Stop the engine.
13. Reseal the fixed SAS with white paint.
14. Turn the ignition switch to ON (do not start engine) and check that the TPS output voltage is as specified.
Standard value...... .0.48-0.52V
15. If it is out of specification, loosen the TPS mounting screws and adjust by turning the TPS.
NOTE:
Turning the TPS clockwise increases the output voltage, while turning counter-clockwise reduces the output voltage.
CAUTION:
Tighten the mounting screws securely after adjustment.
16. Turn the ignition switch OFF.
17. Adjust the accelerator cable play.
- Cable Adjustment Procedure
^ Loosen cable adjustment bolts (See Step 1).
^ Pull the cable mounting tabs toward LH side of vehicle until no slack remains in cable.
^ Push cable toward RH side of vehicle until the appropriate amount of slack is in the cable.
^ Tighten adjusting bolts. Cable adjustment specifications:
M/T 0-1 mm (0.0 - .040 in.) A/T 2-3 mm (.080 - .120 in.)
18. Re-connect the ISC motor connector.
19. Disconnect the voltmeter.
20. Start the engine and check to be sure that the idle speed is 750 +/- 100 rpm.
20a. Check to be sure the Idle Switch is on at idle with the MUT (Code 26) or by using a voltmeter check to make sure there is continuity between pin 2 and ground of the ISC connector as shown.
21. Turn OFF the ignition switch. Remove the 20 amp ECI slow blow fuse located in the relay box on the right front inner fender for 15 seconds. (This erases the data stored in memory during the ISC adjustment.) This can also be accomplished by disconnecting a battery terminal for 15 seconds.
22. Start the vehicle and reconfirm that idle operation is within specification.