G 85 Engine Starting Troubleshooting
wc_tx000678gb.fm 63
7.2 Checking the Engine Control Module (ECM)
Prerequisites Generator shut down
Procedure Follow the procedure below to check the ECM.
1. Open the control panel and locate the ECM.
2. Place the START/RUN switch in the ON position.
Does the ECM boot up and do the “FUEL” & “CRANK” LEDs illuminate?
3. Check connections of battery cables. Also check battery voltage.
Is the battery voltage 12±2V?
4. Locate Plug 1. Check the voltage between red wire #53 of the plug and ground.
Is at least 9.8V measured?
5. Locate Plug 2. Check voltage between red wire #18 and ground during cranking.
Is at least 9.8V measured?
6. Locate Plug 2. Check the voltage between violet wire #64 and ground. Also check the
voltage between yellow wire #63 and ground during cranking.
Is there at least 9.8VDC measured in each case?
The ECM has now been checked. Continue with Checking the Emergency Stop Switch.
Yes____ No____
Go to step 6. Continue
Yes____ No____ Your reading
Continue Charge the battery.
Yes____ No____ Your reading
Continue Repair or replace wire #53.
Yes____ No____ Your reading
Continue Repair or replace wire #15.
Yes____ No____
The ECM is OK. The ECM has failed. Call Wacker Neuson
Service.
wc_gr003720
10A ECM
LEDs
Plug 2
Plug 1
V
R
R
Y
ECM
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