ECM/Sensor Troubleshooting Mobile Generator
wc_tx000723gb.fm 52
5.6 Calibrating ECM AC Amperage Display
Prerequisites
Functioning generator
Ammeter
25A or greater load
Procedure
Follow the procedure below to calibrate the ECM amperage display.
1. Attach a 25A or greater load to the lugs.
2. Place the START/RUN switch in the ON position so that the engine starts.
3. Close the main circuit breaker.
4. Attach a clamp-style ammeter to one of the lines connected to the lugs.
5. Observe the ECM display as it cycles through the amperage values for each leg. Place
the hour meter switch into the down position when the ECM displays an amperage
value.
6. Compare the Amp reading on the ammeter with that on the ECM display.
Are the readings within 0.5 Amps?
7. Open the control panel and locate the AMPS ADJ pot.
WARNING! Electric shock hazard. High voltage exists at the cooling fins of the Automatic
Voltage Regulator (AVR) when the engine is running. Electric shock can cause injury or
death. Do not touch the AVR.
.
8. Adjust the AMPS ADJ pot until the ECM reads the same as the amperage measured by
the ammeter.
9. Close the control panel.
The ECM amperage display has now been calibrated.
Yes____ No____ Your reading
No adjustment is necessary.
Continue.
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