Checking/adjusting
Adjust the idle speed using a Honda tester. If this is not possible, check the following:
Note: Before adjusting the idle speed, check the following items:
- The MIL lamp does not indicate a malfunction.
- Ignition timing.
- Candles.
- Air filter.
- Crankcase ventilation system.
1. Connect the tachometer.
2. Start the engine. Keep the engine speed at 3000 without load on the engine (transmission in neutral, automatic transmission selector in position [P], [N]), until the engine is fully warmed up (the radiator fan should turn on).
3. Check the idle speed without load on the engine: headlights, ventilation, rear window heating, air conditioner, radiator fan should be turned off.
Note: (For KS models) remove fuse #18 (7.5A) from the fuse box and check that the headlights and side lights are not on.
Idle speed should be:
Engine D15Z5:
- M/T — 700±50 rpm
- A/T — 700±50 rpm, position [N] or [P]
Except for the D15Z5 engine:
- M/T — 750±50 rpm
- A/T — 750±50 rpm, position [N] or [P]
4. If necessary, adjust the idle speed by turning the adjusting screw clockwise or counterclockwise by ½ turn.
Engines D14A3, D15Z4, D15Z5:
Note: When removing the ACL housing, do not disconnect the IAT sensor connector.
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5. After turning the adjusting screw ½ turn, check the idle speed again. If the value is still not normal, turn the screw another ½ turn.
Note: Do not turn the adjusting screw more than ½ turn at a time without measuring with a tachometer.
Leave the engine idling for one minute with the heater fan on (hI position) and air conditioning, then check the idle speed again.
Idle speed should be:
Engine D15Z5:
M/T — 780±50 rpm A/T — 780±50 rpm, position [N] or [P]
Except for the D15Z5 engine:
M/T — 810±50 rpm A/T — 810±50 rpm, position [N] or [P]
Note: Do not touch the adjustment screw while the air conditioner is on.