900 L4-1985cc 2.0L DOHC Turbo EFI (1985)
2.
Connect a digital VOM to the actuator terminal pins as shown in Figure 1 and check the actuator resistance.
3.
If an intermittent fault is suspected, lightly tap the actuator while reading the resistance from the center pin to the two outer pins (pins 1 and 3).
4.
If the resistance is incorrect, install a new AIC valve. If the resistance is correct, proceed to the "Operational Check" procedure.
LH 2.4 AIC Valve Troubleshooting
NOTE
Resistance measurements are strongly affected by temperature. The valve should be checked at room temperature. The engine should not be run before
starting this troubleshooting procedure.
1.
Unplug the connector from the AIC valve.
FIGURE 2 - LH 2.4 AIC VALVE TERMINALS.
2.
Check the AIC valve resistance by connecting a digital VOM across the terminals (Figure 2). The resistance should be 7 ohms +/- 5.
3.
If the resistance is out of specification, install a new AIC valve. If the resistance is within specification, continue with step 4.
4.
Perform the component and signal testing procedure in Service Manual Section 0 "News". valve should audibly open and close during the
component test cycle. If the valve does not operate properly install a new valve.
5.
As with the LH 2.2 AIC valve troubleshooting, you can plug the suspect valve into a normally operating LH 2.4 vehicle for a simple operational
check (see Operational Check").
Operational Check for LH 2.2 or LH 2.4
1.
Remove the suspect AIC valve (See Service Manual).
2.
Start a normally functioning car with the appropriate fuel injection system and allow it to idle.
3.
Unplug the connector from the AIC valve of the idling car.
