Wacker Neuson GPS 8500, Repair Manual

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Troubleshooting Voltage Issues GPS 8500/GPS 9700
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3.12 Checking the Auto Idle Circuit
Prerequisites
„
Machine’s battery must measure 12V
„
Multimeter
„
14-gauge jumper wire
Background The idle is controlled by the engine electronic governor system (control module and
motorized actuator) and the switch and current transformer. Each component must
be checked.
Checking the
control
module Follow the procedure below to check the control module.
1. Shut down the generator.
2. Disconnect all loads from the generator.
3. Locate the control module (a) .
4. Remove the loom (harness) to expose the wires.
5. Disconnect the blue wire at the connector.
6. Start the engine.
7. Connect the jumper wire to the module’s blue wire and connect it to ground.
After a 10-second delay the engine should idle down to 1750 rpm.
8. Remove the ground wire.
The engine should return to 3600 rpm.
Does the module perform as stated above?
Checking the
actuator Follow the procedure below to check the actuator.
1. Shut down the engine.
This procedure continues on the next page.
Yes ____ No ____
Continue. The module has failed; replace it.
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