Generac Power Systems IM Series - Manual (Page 19)

Test Procedure:- See Figure 9. Disconnect Wire 18 from
Reiay Terminai 2 and Wire 85 from Terminai 4, to prevent
interaction. Set a VOM to its "Rxl" scaie and zero the
meter. Then, connect the VOM test ieads aaoss Reiay
Terminais 2 and 4- the meter needie shouid swing ups-
caie (continuity). Hoid Start/Stop Switch at START to
crank engine- the VOM needie shouid drop aii the way
downscaie (infinity).
Test Results:
A. Control Relay CR2 checks GOOD; Repeat Steps 1
through 9
B. Control Relay CR2 checks BAD: Replace Relay CR2
step 10- Test Control Relay CR2
Problem No. 3- Engine Cranks and Starts,
Shuts Down When Start/Stop Switch is
Released
Step 1- Check Engine Oil Level
Test Procedure:- Check engine oil level as outlined in
Owner’s Manual. If oil level is low, sufficient oil pressure
to open the Low Oil Pressure Switch contacts will not be
developed. With Start/Stop Switch at START, Control
Relay CR2 action will open the engine ignition circuit to
ground. However, as soon as the Start/Stop Switch is
released, CR2 contacts will close and closure of the Low
Oil Pressure Switch contacts will close the ignition circuit
to ground and ignition will terminate. The result will be an
ehgine'shutdown as soon as the Start/Stop Switch is
released.
Test Results:-
A. Oil level is LOW: Add oil as required (don’t forget Oil
Makeup Tank)
B. Oil level is GOOD: Go to Step 2
NOTE: You may wish to check engine oil pressure.
See ENGINE SERVICE MANUAL for Oil pressure
check procedures and specifications. ______________
Test Procedure: Set a VOM to its "Rxl" scale and zero
the meter. Disconnect Wire 85 from the Switch terminal,
then test the Low Oil Pressure Switch (Fig. 10) as follows:
1. Connect one VOM test lead to the switch terminal, the
remaining test lead to a clean frame ground. Meter
should indicate continuity.
2. Crank engine. The VOM needle should drop all the
way downscale (infinity) as oil pressure inaeases.
3. If the engine starts and runs, hold terminal end of Wire
85 into firm contact with a dean frame ground. Engine
should shut down.
Test Results:
A. Oil Pressure Switch checks GOOD: Go to Step 3.
B. Oil Pressure Switch checks BAD: Replace switch.
Step 2 - Check Oil Pressure Switch
Step 3- Check Oil Temperature Switch
Test Procedure: Set a VOM to its "Rxl" scale and zero
the meter. Disconnect Wire 85 from the Switch terminal,
then test the Oil Temperature Switch (Fig. 10) as follows:
1. Connect one VOM test lead to the switch terminal, the
remaining test lead to a clean frame ground. Meter
should indicate continuity.
2. If the engine starts and runs, hold terminal end of Wire
85 into firm contact with a dean frame ground. Engine
shouid shut down.
Test Results:
A. OifTemperature Switch contacts check GOOD: Go to
Step 4.
B. Oil Temperature Switch contacts check BAD: Check
wiring.
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