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TESTER CONNECTION
TESTER CONNECTION CONDITION SPECIFIED VALUE
H15-1 (SHB) - H15-3 (SHG) Ign. switch ON 4.5 to 5.5V
H16-1 (SHB) - H16-3 (SHG) Ign. switch ON 4.5 to 5.5V
REAR HEIGHT CONTROL
SENSORS
Two rear height control sensors
(RH and LH) are featured. Inside
the sensor, a brush integrated
with the control sensor rotor shaft
moves above the resistor, providing
linear output.
Since the resistance value
between the brush and resistor
terminal changes in proportion to
the shaft rotation angle, the fi xed
voltage applied to the resistor by
the ECU is modifi ed by the sensor
and output to the ECU as a voltage,
indicating the shaft rotation
angle.
The rear height control sensor
(LH and RH) provides a voltage
output that the ECU compares
against a fi xed voltage.
If DTC C1713/13 or C1714/14 is
output, with the ignition switch
ON, a voltage of 4.7V or more
(or 0.3V or less) at each height
control sensor sub-assembly is
detected for one second.
If DTC C1713/13 is output,
the trouble area may include
the height control sensor subassembly
RH, the right rear height
control sensor circuit, or the
suspension control ECU.
If DTC C1714/14 is output, this
indicates the same potential
trouble areas regarding the left
rear height control sensor.
Once either of the above DTCs
are stored in ECU memory, vehicle
height control is suspended and
will not operate until a normal
signal is output to the ECU. However,
the control resumes if the
ignition switch is turned OFF and
then ON again.
When the suspension control
ECU detects a malfunction in the
height control sensor, the height
control indicator light “N” illuminates
(steady or blinks), and the
height control switch (“HI” and
“LO”) is suspended.
When either the RH or LH
height control sensor sub-assemblies
are faulty, the suspension
control ECU uses the remaining
(RH or LH) sensor circuit to adjust
the vehicle to normal height.
When both of the height control
sensor operations are faulty, the
suspension control ECU suspends
the height control function immediately.
If DTC C1761/61 (ECU malfunc-
Spring 2010 STAR Service News
TOYOTA TECHNICAL
tion) and/or C1774/74 (power
source circuit) is displayed,
perform the inspection for DTC
C1761/61 and/or C1774/74 fi rst.
Connect the intelligent tester
to the DLC3 and turn the ignition
switch ON. Then push the tester
main switch ON.
Select the item “RL HEIGHT” or
“RR HEIGHT” in the DATA LIST, and
read the value displayed on the
tester.
Check the vehicle height value
of the height control sensor
sub-assembly with the intelligent
tester, while pressing the height
control switch “UP” or “DOWN.”
If OK, replace the suspension
control ECU.
If not OK, check the harness and
connector of the height control
sensor sub-assembly rear power
source.
Disconnect the height control
sensor sub-assembly rear LH and
RH connectors.
Turn the ignition switch to the
ON position.
Measure the voltage according
to the following values: See chart
at top of page.
If OK, inspect the height control
sensor sub-assembly.
If not OK, check the harness and
connector (height control sensor
rear suspension control ECU).
Disconnect the S13 suspension
control ECU connector. Measure
the resistance according to the
following values:
LH TESTER CONNECTION
SPECIFIED CONDITION
S13-22 (SBL2) - H15-1 (SHB)
below 1 ohm
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