Special Tools
CDS G3 Interface Kit 8M0138392
CDS G3 License Key, Interface, Adapter, and Harness
DMT 2004 Digital Multimeter 91‑892647A01
A
C O
M
m
A
V H z
mV
V
H z TEMP
m A
A
IG
IP
OFF
H z
TEMP
4516
Measures RPM, ohms, amperes, AC and DC voltages; records maximums and
minimums simultaneously, and accurately reads in high RFI environments.
Terminal Test Probe Kit Bosch P/N MM‑ 46523
Test probes adapt test meter leads to harness connections without damaging
harness terminals. May be used with Computer Diagnostic System (CDS).
Shift Actuator Harness 8M0150597
Used to perform shift actuator circuit test.
Test Light Obtain locally
Applies an electrical load to a circuit, and visually indicates whether voltage is
present.
Electronic Throttle Control (ETC)
Overview
The ETC is controlled through the PCM. The PCM receives information from the throttle demand sensor, and the PCM
activates the ETC motor to open or close the throttle valve. The two throttle valve position sensors in the ETC are also
monitored by the PCM.
The ETC functions as an idle air control (IAC) valve. During hard deceleration, the ETC will remain open slightly until the engine
RPM has stabilized, to eliminate engine stalling.
The ETC has a built‑in fail‑safe: the ETC is spring‑loaded to an off idle position to maintain engine RPM at approximately 1200
RPM in gear.
The ETC can be tested with the computer diagnostic system (CDS G3).
CDS G3 Interface Kit
8M0138392
Troubleshooting the ETC
IMPORTANT: The ETC is integral to the throttle body assembly, and cannot be serviced separately. If the ETC fails, the entire
throttle body assembly must be replaced. Refer to the appropriate service manual for throttle body assembly replacement
procedures.
Actuators and Relays
Page 5B-2 © 2018 Mercury Marine 90-8M0146617 eng JULY 2018
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