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996 - IACV Frequency

shalco
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Loren Member

Loren

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The manual does not say - only that the two coils control the pulse duration. The troubleshooting is verifying that the two coils are working.

"Idle speed control is realized via the idle air control (lAC) valve. Two coils, the opening coil and closing coil, are integrated in the lAC valve for this purpose.

The basic or emergency position is that adopted when neither of the coils is triggered. To increase the rpm, the opening coil is triggered with a certain pulse duty ratio; to reduce the rpm, the closing coil is triggered."

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Loren Member

Loren

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Check coil resistance of lAC valve.

1. Remove connector of lAC valve.

2. Connect ohmmeter to pins 2 and 1 of lAC valve.

Display: 14 - 17 ohms at 20°C.

Check wiring from DMIE control module to lAC valve for continuity.

1. Remove connector of lAC valve.

2. Connect special tool 9616 to wiring harness (DME control module connector).

3. Connect ohmmeter to special tool 9616, pin 2, and to lAC valve connector, pin 1.

Display: 0 - 5 ohms

If infinite ohms is displayed, check wiring harness for chafing and pinching damage.

Check wiring from DME control module to lAC valve for short circuit to ground.

1. Remove connector of lAC valve.

2. Connect special tool 9616 to wiring harness (DME control module connector).

3. Connect ohmmeter to special tool 9616, pin 2, and ground.

Display: infinite ohms

If 0 - 5 ohms is displayed, check wiring harness for chafing and pinching damage.

Check wiring from DME control module to lAC valve for short circuit to B+.

1. Remove connector of lAC valve.

2. Connect special tool 9616 to wiring harness (DME control module connector).

3. Connect voltmeter to special tool 9616, pin 2, and ground.

Display: 0 V

If battery voltage is displayed, check wiring harness for chafing and pinching damage.

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