Cub Cadet Z-Force S Series - Manual (Page 94)

Z-Force-S
88
Key switch
The Key Switch is similar to those used in a variety of
MTD applications since 1999. The difference, in this case,
is that it is incorporated in the same housing as the RMC
module; the two items are not available separately.
See Figure 7.1.
1. In the OFF position, continuity can be found
between the M, G, and A1 terminals.
See Figure 7.2.
• M is connected to the magneto by a yellow
wire, G is connected to ground by a green wire,
and A1 is connected to the after fire solenoid.
NOTE: In the OFF position, the magneto primary
windings are grounded, disabling the ignition sys-
tem. The after fire solenoid loses its power from the
B terminal. This turns off the fuel supply.
• Symptom: engine runs with key in OFF posi-
tion: The key switch is not completing the path
to ground either because of an internal fault or
a bad ground connection elsewhere in the har-
ness. Check continuity between M, G, and A1
terminals with key switch in OFF position.
Check the green wire for continuity to ground.
• Symptom: loud “BANG” when key is turned to
the OFF position: The after fire solenoid is not
closing, either because it is physically damaged
or the power is not being turned off. Check for
power at the solenoid. Check continuity
between G and A1 terminals. Check for no con-
tinuity between A1 and the B terminals.
NOTE: If the engine is at an idle when the key is
turned off, fuel is drawn into the engine through the
idle ports of the carburetor by-passing the fuel shut
off solenoid. The raw fuel will travel through the engine and ignite in the muffler causing an after fire.
• Symptom: Engine runs 3-5 seconds after key is turned to OFF position: The after fire solenoid is turning
off the fuel supply, but the ignition is continuing to operate. Check continuity between the M and G termi-
nals in the OFF position. Check continuity from yellow wire connection all the way to the spade terminal
on the magneto.
2. In the START position, continuity can be found between B, S, and A1 terminals.
• Battery power from the B terminal is directed to the start circuit through the S terminal and to the after fire
solenoid through A1.
• Symptom: No crank and no starter solenoid click: Power is not getting to the trigger spade on the starter
solenoid. Test for a good battery then check for power where the fused red wire with white trace connects
to the B terminal. Check for continuity between B and S terminals in START position. If power is getting to
the S terminal in the START position, the problem lies down-stream in the starter circuit, Check continuity
from the orange wire on the S terminal to the orange wire with white trace on the trigger spade on the
starter solenoid. If it is broken, trace through the parking brake and PTO switches.
• Symptom: No crank, solenoid click: The problem lies in the heavy-gauge side of the starter circuit; low
battery voltage, battery cables, starter cable, solenoid, or ground issue.
Figure 7.1
Key
Switch
RMC Module
Front
Back
.H\VZLWFKVFKHPDWLF
/
0
$
$
*
6%
/
0
$
$
*
6%
/
0
$
$
*
6%
/
0
$
$
*
6%
2II 6WDUW
5XQZ50& 1RUPDOUXQ
Figure 7.2