Mobile Generator ECM/Sensor Troubleshooting
wc_tx000723gb.fm 51
5.5 Calibrating ECM Voltage Display
Prerequisites
Functioning generator
Procedure
Follow the procedure below to calibrate the ECM voltage display.
1. Open the large hinged panel. Remove the “key” (latch) from the lug door and place it in
the slot of the lug door switch. NOTICE: Never place anything but the key into the slot of
the lug door switch.
2. Close the large hinged panel.
3. Place the START/RUN switch in the ON position so that the engine starts.
WARNING! Electric shock hazard. High voltage exists at the lugs when the engine is run-
ning. Electric shock can cause injury or death. Do not touch the lugs.
4. Open the lug door.
5. With a multimeter, measure the AC voltage between lug 1 and lug 2.
6. Compare the reading on the multimeter with that on the ECM.
Are the readings within 2 Volts?
7. Open the control panel and locate the VOLTS ADJ pot on the ECM.
WARNING! Electric shock hazard. High voltage exists at the cooling fins of the AVR when
the engine is running. Electric shock can cause injury or death. Do not touch the AVR.
8. Adjust the VOLTS ADJ pot until the ECM reads the same as the voltage measured at
the lugs.
9. Re-install the key to the door switch and close the control panel.
The ECM voltage has now been calibrated.
Yes____ No____ Your reading
No adjustment is necessary. Continue.
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