Legend Sedan V6-2494cc 2.5L SOHC FI (1987)
Idle Speed: Testing and Inspection
Coupe
Idle Speed Inspection/Adjustment
1. Start the engine and warm it up to normal operating temperature (the cooling fan comes on).
2. Connect a tachometer.
3. Set the steering in the straight forward condition, and check idling in no-load conditions in which the headlights, blower fan, rear defroster, cooling
fan, and air conditioner are not operating.
Idle speed should be:
Manual: 680 ± 50 rpm
Automatic: 680 ± 50 rpm in [N] or [P]
4. Check the Yellow LED display at the ECU under the passenger's seat.
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If Yellow LED is off
Do not adjust idle adjusting screw.
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If Yellow LED is blinking
Adjust idle adjusting screw 1/4 turn clockwise.
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If Yellow LED is on
Adjust idle adjusting screw 1/4 turn counterclockwise.
NOTE:
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On a new engine (less than 310 miles or 500 km) the Yellow LED may light even though the idle adjusting screw is properly set. Under such
conditions, no adjustment should be made.
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Check that the Yellow LED goes off after approximately 30 seconds.
If it does not go off, rotate the idle adjusting screw by 1/4 turn in the same direction, and repeat the same operation until the Yellow LED goes
off.
5. Check the idle speed in the following conditions.
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With headlights (Hi) and rear window defogger ON.
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While the steering wheel is turning.
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With air conditioner compressor on.
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If, applicable, with Automatic transmission model when shifted in gear (except [N] or [P]).
Idle should remain stable at: 680 ± 50 rpm