2. Start the engine and let it warm up to operating temperature. Turn off the engine and remove the air filter as described in Chapter 37.
3. Disconnect the electrical connector of the auxiliary air supply valve. Connect a voltmeter between the connector terminal and ground.
Connect a voltmeter to check the operation of the auxiliary air injection system valve
4. Start the engine. Increase the engine speed to 3000 rpm, then sharply release the throttle and monitor the voltmeter readings. At speeds greater than 2100±100 rpm no voltage should be registered; below this speed, the voltmeter should read 12 V. Turn off the engine and remove the voltmeter.
5. Check the operation of the additional air supply system valve by connecting it to the battery as shown in the figure. When voltage is applied, a click should be heard.
Connect the valve to the accumulator as shown to check its operation
6. Check the idle switch as follows. Start the engine and connect the voltmeter to the connector as shown in the figure. At idle speed, no voltage should be registered. Increase engine speed and check that the voltmeter reads 12V at 1200-1300 RPM. Turn the idle speed switch adjusting screw if necessary to adjust the switch.
Connect the voltmeter (top right) to the idle switch of the additional air supply system
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7. Turn off the engine, disconnect the voltmeter and install the air filter.
8 For further information on the additional air supply system, see. v Section 6.