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EN – 67
2. With a multi-meter, measure the volts DC of the red
wire.
a. With engine off, reconnect the 14-pin connector to
the ECU.
b. Position the red probe on the terminal of the red wire
at the potentiometer (Pin 5 in Figure 168). Also see
Figure 169.
c. Position the black probe on the engine block.
d. Turn ignition key to ON position.
e. Turn the potentiometer from low-idle to full throttle.
Voltage to the red wire should measure 4.90 – 5.0 volts DC
at both low-idle and full throttle positions.
If voltage measures less than 4.90, replace ECU.
3. With a multi-meter, measure the volts DC of the
green / white wire. See Figure 170.
a. With engine off, position the red probe on the
terminal of the green / white wire.
b. Position the black probe on the engine block.
c. Turn ignition key to ON position.
d. Turn the potentiometer from low-idle to full throttle.
Voltage to the green / white wire should measure close to
0.01 volts DC at low-idle and close to 5.0 volts at
full throttle.
If voltage does not vary between low-idle and
full throttle, replace the ECU.
Battery Connector 1
Engine Connector 1
Potentiometer 2
Ignition Key Switch 2
14
13
12
11
10
9
Battery Connector 2
Engine Connector 2
Potentiometer 3
Potentiometer 1
Ignition Key Switch 1
7
6
5
4
3
2
8
1
Red
Green
Yellow
Yellow
Red
Yellow
Yellow
Figure 168
Figure 169
Figure 170
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