90-824052R3 JUNE 2002 FUEL SYSTEMS - 3D-39
Detonation Control Module Check
Purpose: This check will determine if control module
is correctly signaling ECM when signals are
received from sensor.
1. Insert probe (a) (i.e. paper clip) to gray/white wire
connector (b). Connect digital volt meter (from
EFI tester 91-11001A2) positive clip (c) to probe
and ground clip to engine ground (d) as shown.
d
a
b
51795
c
a - Probe
b - Connector
c - Positive Clip
d - Ground Clip
2. Turn meter dial to 20 volts DC position and power
switch in ON position. Place outboard in water.
3. Start and operate engine at idle.
4. Check meter reading. A reading between 0.30 to
0.70 volts DC should be attained.
5. Increase engine speed (with engine in gear) be-
tween 3000-4000 RPM. Check meter reading. A
typical reading should be 0.01 volts DC.
Results: If meter reading is 0.30 to 0.70 volt DC at
idle and 0.01 volts DC at 3000-4000 RPM,
detonation control unit is functioning properly
(no detonation occurring).
If voltage reading does not fall within range (0.30 to
0.70 volts DC) at idle, control module may be bad.
If voltage reading is above 0.01 volts DC and
between 1.0 to 6.6 volts DC at 3000 to 4000 RPM
detonation is occurring. A constant voltage of 6.6
volts DC would indicate bad detonation control
module.
Throttle Position Sensor Test
Purpose: This test eliminates possibilities of
improper fuel delivery related to the throttle
position indicator. Refer to EFI electrical
system and ECM test.
NOTE: Engine harness MUST BE disconnected
from the EFI tester 91-11001A2 and reconnected in
the normal running configuration in order to test or
adjust the throttle position sensor.
IMPORTANT: TPS can be adjusted using a digital
meter. Analog (needle) type may be used
although it may be difficult to read the low
voltage setting accurately with most meters.
1. Disconnect TPS from EFI harness.
2. Connect digital using TPS Test Lead Assembly
(a) (P/N 91-816085) between TPS connector (b)
and EFI harness connector (c). Set voltmeter to
2 DC volts.
55198
a
b
c
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