Checking Idle-Up Signal - Suzuki Samurai 1986 Service Manual

[Checking idle-up signal]

The idle-up system operates when any of the small lights (such as tail light, side marker light and license
light), heater fan and rear defogger is put in operation. If the idle-up actuator fails to operate even when
any of such equipments is put in operation, check if signal is sent to the ECM according to the following
procedure.
1) Disconnect the coupler from the ECM.
2) Turn ON the ignition switch but don't run the engine.
3) Connect a voltmeter between the @ terminal and the body (ground) as shown in below figure. If the
voltmeter indicates 11 - 14V when each equipment is operated individually, it means that idle-up
signal is sent to the ECM.
If the voltmeter does not indicate 11 - 14V, the particular circuit is disconnected or in poor contact.
Check the circuit for such conditions.
4) After checking, connect the coupler to ECM securely.
Fig. 5-3-46 Checking idle-up signal
5-35