Index Nissan Nissan PULSAR N13 Series / ASTRA LD Series (1.6 and 1.8 Liter) 1987 – 1991 year - Service Manual
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Fuel and Engine Management
101
Location of the idle air control (IAC) valve. Inset shows the terminal identification. (b) Check for a binding throttle cable, throttle shaft or throttle position sensor. (c) Check the coolant temperature sensor resis- tance as described later in this section. (d) Ensure that the battery terminals and the engine earth terminals are clean and secure. (e) Check the operation of the Park/Neutral switch and the transaxle as described in the Automatic (f) Check the spark plug gaps as described in the Engine Tune-up section. (g) Check the base idle speed adjustment. (h) Check the fuel pressure and check the system for leaks as described previously.
(I) Check the alternator voltage output as de- scribed in the Electrical System section to ensure that
(j) Remove the IAC valve and check the bore in the throttle body for dirt or damage.
(7) Stop the engine, switch the ignition On and connect a jumper lead between terminals A and B on (8) Disconnect the wiring connector from the IAC valve. (9) Check for voltage at each of the terminals on the IAC valve wiring connector using a test lamp. If the test lamp flashes at each terminal, correct operation of the wiring and control unit is indicated.
If the test lamp is a steady light at one or more terminals, proceed to operation (10).
If the test lamp does not flash at one or more of the terminals proceed as follows:
(a) Check the circuit with no voltage for shorts and for continuity between the IAC valve and the (b) Measure the resistance across the IAC valve terminals A and B, and across terminals C and D. The resistance should be more than 30 ohms.
If the resistance is not as specified, renew the IAC valve.
If the resistance is as specified, check for faulty wiring connector terminals on the IAC valve and the
(10) Switch the ignition Oft' and disconnect the control unit wiring connectors. (11) Switch the ignition On and check the IAC connector with the test lamp again. If the light is stilt (12) If the light is not on, check for faulty IAC valve terminals. If no fault is found renew the IAC To Remove and Install
(1) Disconnect the negative battery terminal. assembly as previously described. (3) Disconnect the wiring connector from the IAC valve. (4) Remove the IAC valve retaining screws and withdraw the IAC valve and O ring.
View of the IAC valve removed from the throttle body assembly. 1.6 liter engine. (5) Clean the IAC sealing surfaces to ensure proper operation.
Installation is a reversal of the removal procedure with attention to the following points:
(1) When installing a new IAC valve ensure that the part number is correct as the valve is not (2) Measure the length of the pintle extension as shown in the illustration. If necessary push the pintle NOTE: Installing (he IAC valve with the
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