Generac Power Systems MC User Manual

Page 51

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When the Stop/Start Switch is set to STOP, Ignition Stator (IS) output

from Wire No. 25, Ignition Module (IM) Pin No. 3, Wire No. 25 to the

Terminal Block and Wire No. 20 is delivered to frame ground. Ignition

terminates and the engine shuts down. The Control Relay de-energizes
and its contacts open to close the Fuel Lockoff Solenoid (FS) and ter

minate Fuel Pump (FP) operation,

2.4.3-

DIAGNOSTIC TESTS

2.4.3.1-

CHOKE PULSE MODULE

METHOD 1:- Install a known good Choke Pulse Module, Crank engine,

RESULT:- Choke operates normally...........Replace Choke Pulse Module

Engine starts.

Choke does not function and/or....Continue Diagnostic Tests,
no start

Section 2,1

METHOD 2:- A.)-

Unplug Choke Pulse Module, Set VOM

to "+DC” and to ”50V." scale.

Connect positive (+) meter test
probe to Module receptacle Pin No,

1, common (-) test probe to frame
ground. Crank engine. Meter should
indicate 9-12 Volts DC. This is
the input voltage to the Choke Pu
lse Module,

Choke Pulse
Module

Ignition
Module ReceptacI

Choke Pulse
Module Receptacle-

B, )-Plug Choke Pulse Module into

its receptacle. Set VOM to ”+DC"
and to "50V,” scale. From bottom
of receptacle, connect positive (+)

meter test probe into receptacle

Pin No. 1 and common (-) test probe

to frame ground. Crank engine. The

meter should indicate a pulsing

voltage and choke solenoid should
pulse.

C. )-Plug Choke Pulse Module into its receptacle. Set VOM to "+DC" and

to '’50V,” scale. From bottom of Module receptacle, connect positive

meter test probe to receptacle Pin No. 3, Connect common (-) test pr

obe to frame ground. Crank engine. Meter should indicate approximate
ly 12 Volts DC.

RESULTS:-All tests were good..,.Continue diagnostic tests. Section 2.1

Test A checked bad.... Check Wire No. 90 between receptacle

and Choke Solenoid, Choke Solenoid,

Wire No, 91 between Choke Solenoid and

Starter Solenoid (SC), Starter Solenoid

(SC)

Test B checked bad.... Replace Choke Pulse Module (CM)
Test C checked bad,,,,.Replace Choke Pulse Module (CM)

2.4-5