9-142
P0638
Ground short circuit check “A”
Lines short circuit check “B”
5. Defective throttle servo motor.
• Check the throttle servo motor.
Refer to “CHECKING THE THROTTLE SERVO MOTOR” on page 8-108.
Between ECU coupler “2” and ground
yellow/red–ground
yellow/white–ground
red/blue–ground
Throttle servo motor coupler “1”
yellow/red–any other coupler terminal
yellow/white–any other coupler terminal
ECU coupler “2”
yellow/red–any other coupler terminal
yellow/white–any other coupler terminal
red/blue–any other coupler terminal
Is resistance ?
YES
Go to step 5.
NO
a. Replace the wire harness.
b. Push the ON/start switch, and then check the condition of the DTC using the malfunction mode
of the YDT.
Is it in the “Recovered” condition?
YES
Go to step 8, and complete the service.
NO
Go to step 5.
Is check result OK?
YES
Go to step 6.
NO
a. Replace the throttle bodies.
Refer to “REPLACING THE THROTTLE BODIES” on page 7-11.
b. Push the ON/start switch, and then check the condition of the DTC using the malfunction mode
of the YDT.
O
B/GY/R
B
R/BG/B
Y/W
B
Y/RR/L
BB
R/LL/Y
Y/W
R
O
B/GY/R
B
R/BG/B
Y/W
B
Y/RR/L
BB
R/LL/Y
Y/W
R
Y/R
Y/W
212
A B
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