IDLE SPEED CONTROL (ISC) SYSTEM

F-98prose procedure

PREPARATION

Perform this inspection when the engine is cold. (Engine coolant temperature below 20°C [68°F].)

NOTE

When using an externally powered tachometer connect it to the power connector (Blue: 1-pin).

WARNING

Do not ground the power connector terminal (Blue: 1-pin); the wiper 20A fuse will be burned.

1
Connect a tachometer to the diagnosis connector terminal IG-.
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2
Connect the SST and set the TEST SW to "SELF TEST" or connect diagnosis connector terminals TEN and GND with a jumper wire.
3
Verify that the engine speed gradually decreases as the engine warms up.
4
Remove the SST or the jumper wire.

CAUTION

Be extremely careful when making connections to the diagnosis connector as a mistaken connection will cause a malfunction.

1
Warm up the engine to the normal operating temperautre and run it at idle.
2
Disconnect the ISC valve connector (Black: 2-pin) and verify that the valve clicks and the engine speed increases to approx. 1,200 rpm.
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3
Reconnect the ISC valve connector.

NOTE

Before disconnecting the water hoses, drain the engine coolant.