Toyota ZZT230 series, Repair Manual

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D�
-
_,
DTC 21 Open in Vehicle Speed Sensor Circuit
CIRCUIT DESCRIPTION
The
signal from the vehicle speed sensor
circuit
is sent to
cruise
control
ECU as vehicle speed signal.
The rotor shaft is driven by the gear of the transmission.
For each rotation of the shaft, the vehicle speed sensor sends a 4-pulse signal through the combination
meter to the cruise oontroi ECU (See the following installation).
This signal is converted Inside the combination meter and sent as a 4-pu l s e signal to the cruise control ECU.
The
ECU
calculates the vehicle speed from this pulse frequency.
DTCNo.
21
4
pu1ses1 4
pulses/
1 rotation
1
rotation
of
rotor
shaft
of
rotor shaft
....
....
ECU
Combination Me
te
r Cruise Control ECU
Detection
Item Trouble Area
•
Combination meter
Speed signal
Is not Input to the cruise control ECU while cruise
•
Harness or connector between cruise control ECU aod com-
blnation meter, combination meter and vehicle speed sensor
control is set.
•
Vehicle speed sensor
•
Cruise control ECU