12.12
ELECTRICAL
ELECTRONIC THROTTLE CONTROL
(ETC) SWITCH
Electronic Throttle Control (ETC) Switch
The Electronic Throttle Control (ETC) switch is designed to
close during throttle movement in the event the throttle cable
sticks or breaks.
When the throttle lever is at idle position, the ETC switch
contacts should be closed (touching). When the throttle lever is
moved the contacts will open and allow normal operation. If the
contacts remain closed or become closed during throttle
movement, the ECU will limit engine RPM.
IMPORTANT: The throttle cable must have the proper
amount of free-play adjustment. Refer to Chapter 2
“Throttle Cable Adjustment” procedure.
GEAR SELECTOR SWITCH
Selector Switch Function Test
1. Locate the gear selector switch on the transmission.
Remove the wiring harness connector and insert the
multimeter probes into the switch.
2. Move the gear selector handle to each of the 5 drive
positions (HIGH, LOW, NEUTRAL, REV, or PARK).
3. Test for continuity between the switch contacts and
connector leads. Replace the switch if no continuity or high
resistance is found in any of the gear positions.
Resistor Module Function Test
The resistor module relays a different resistance reading to the
ECU depending on which gear is selected by the operator. If the
module fails, the ECU will not be able to determine what gear
the transmission is in.
NOTE: Reference Chapter 3: EFI for pin locations.
1. Disconnect the ECU harness connector from the ECU.
Locate pins 8 (WHITE) and 33 (VIOLET).
2. Set the multimeter to register OHMS (resistance). Insert the
RED probe into pin 8 and the BLACK probe into pin 33.
3. Reference the Resistance Table for specifications. If any of
the tests fail, replace the resistor module.
ETC Switch - Contact Positions
Throttle Lever at Rest (idle)
ETC is CLOSED.
Pins 1 and 2 Ω = 2.15k
Normal Operation (throttle
open or above idle)
ETC is OPEN.
Pins 1 and 2 Ω = 6.76k
Throttle Cable Stuck
ETC is CLOSED
Pins 1 and 2 Ω = 2.15k
Gear Selector Switch Testing
ABCDEF
HIGH
LOW
NEU
REV
PARK
Module Resistance +/- 5%
Gear Position
OHMS Ω
HIGH 620
LOW 300
NEUTRAL 160
REVERSE 75
PARK 24
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