ELECTRICAL
10.12
ELECTRONIC THROTTLE CONTROL (ETC) SWITCH
(COMPOSITE THROTTLE HOUSING)
The Electronic Throttle Control (ETC) system is designed to stop the engine of an ATV in the event of a mechanical
problem with the throttle mechanism. The ETC switch is mounted independently of the throttle actuator lever
inside the throttle block assembly. This is a normally closed switch, and is held in the open position (contacts are
separated as shown in Illustration 1) by throttle cable tension. The contacts are “open” in normal operation
regardless of throttle lever position. In the event of a mechanical problem in the throttle mechanism (cable tension
is lost), the switch contacts close, connecting the CDI black wire to ground, preventing ignition spark. This is the
same as turning the key or engine stop switch “OFF”.
Test the ETC switch at the harness connector. NOTE: Adjust throttle cable freeplay (ETC switch) and make sure
throttle mechanism is functioning properly before testing the switch. Refer to Maintenance Chapter 2 for cable
adjustment procedure.
ETC OPERATION TEST
1.
Remove
throttle
block
cover
by
carefully
releasing all tabs around edge of cover.
2.
Place transmission in neutral and apply parking
brake.
3.
Start engine and open throttle lever slightly until
engine RPM is just above idle speed.
4.
Hold throttle cable with fingers at point “A” as
shown below and release throttle lever. If the
ETC system is functioning properly, the engine
will lose spark and stop.
Switch contacts are open
during normal operation
A
ETC switch contacts are
closed in fault condition
(throttle cable slack).
Electronic Throttle Control (ETC) Switch
(Composite Throttle Housing)
Brn
Blk
Brn
Illustration 1
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Summary of Contents for 2009 Trail Blazer 330
Page 94: ...ENGINE 3 48 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 110: ...FUEL SYSTEM CARBURETION 4 16 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 124: ...BODY STEERING SUSPENSION 5 14 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 196: ...ELECTRICAL 10 4 REVERSE LIMIT SYSTEM P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 226: ...ELECTRICAL 10 34 NOTES P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 227: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BOSS P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 228: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BOSS P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 229: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BLAZER P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...
Page 230: ...ELECTRICAL WIRING DIAGRAM 2009 TRAIL BLAZER P a r t S h a r k c o m 8 7 7 9 9 9 5 6 8 6 ...