Idle-Up Signal Check

Fig. 34 Idle-up compensator signal test specifications. Models w/manual transmission:

Fig. 51 Checking idle-up signal. 1987 - 88 models w/manual transmission:

Manual Transmission
The idle-up system should operate when the running lights, heater fan, cooling fan, or rear defogger are put into operation. If idle-up actuator fails to operate when any of these accessories are switched on, check if proper signal is sent to ECM as follows:
1. Disconnect ECM connector.
2. Turn ignition switch ``On'' without starting engine.
3. Connect voltmeter between terminal 15 and body (ground) individually, Fig. 51. Activate each component as described in Fig. 34. If voltmeter reads 11 - 14 volts as each component is activated, the idle-up signal is being sent to the ECM. If reading of 11 - 14 volts is not obtained, circuit is making poor contact or is open. Correct as necessary.
4. Reconnect ECM connector securely.

Fig. 52 Checking idle-up signal. 1987 - 88 models w/automatic transmission:

Automatic Transmission
The idle-up system should operate when the vehicle is stopped and the shift lever is in D, 2, L or R ranges. If idle-up actuator fails to operate during these ranges, check if proper signal is sent to ECM as follows:
1. Disconnect ECM connector.
2. Switch on ignition without starting engine, then connect voltmeter between terminal 15 and body ground as shown in Fig. 52.
3. Position shift lever in each range indicated above and observe voltmeter. Voltmeter should read 11 - 14 volts. If reading of 11 - 14 volts is not obtained, the circuit is making poor contact or is open, or the controller is defective. Correct as necessary.
4. Reconnect ECM connector securely.