C1713
SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1713: Rear Height Control Sensor RH Circuit Malfunction
DTC C1713 - Rear Height Control Sensor RH Circuit Malfunction
DTC C1714 - Rear Height Control Sensor LH Circuit Malfunction
DESCRIPTION
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 fixed voltage applied to the resistor by ECU is modified by the sensor and output to the ECU as a voltage indicating the shaft rotation angle.
HINT:
- Once the ECU stores DTC C1713/13 or C1714/14 in the memory, vehicle height control is suspended and not carried out until a normal signal is input to the ECU from the height control sensor sub-assembly. However, the control resumes if the ignition switch is turned OFF, and then turned ON again.
- When the suspension control ECU detects a malfunction in the height control sensor, the height control indicator light "N" comes on or blinks, and the height control switch ("HI" and "LO") is suspended.
- When either one of the right or left height control sensor sub-assembly is faulty, the suspension control ECU uses the other one (functioning one) to adjust the vehicle height to the normal height. When both of the height control sensor sub-assembly are faulty, the suspension control ECU suspend the height control function immediately.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
- Proceed to troubleshooting following the flow chart, regardless of whether or not DTC C1713/13 or C1714/14 is displayed.
- If DTC C1761/61 (ECU malfunction) and/or C1774/74 (power source circuit) is displayed, perform the inspection necessary for DTC C1761/61 C1761 and/or C1774/74 C1774 first.
(If DTC C1761/61 and C1774/74 are output at the same time, perform the inspection necessary for DTC C1774/74 first.)
- Start the inspection from step 1 when using the Techstream, and start from step 2 when not using the Techstream.
PROCEDURE
1. READ VALUE USING DATA LIST
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ON and Techstream on.
(c) Select the item "RL Height Control Sensor" or "RR Height Control Sensor" in the Data List, and read its value displayed on the Techstream.
(d) Check the vehicle height value of the height control sensor sub-assembly with the Techstream while pressing the height control switch "UP" or "DOWN".
OK:
Vehicle height value changes.
OK -- REPLACE SUSPENSION CONTROL ECU
NG -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR POWER SOURCE)
(a) Disconnect the height control sensor sub-assembly rear LH and RH connectors.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:
LH Side
RH Side
OK -- INSPECT HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR
NG -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SENSOR REAR - SUSPENSION CONTROL ECU)
(a) Disconnect the S18 suspension control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
LH Side
RH Side
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. INSPECT HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR
(a) Remove the height control sensor sub-assembly rear LH or RH.
(b) Connect 3 dry batteries of 1.5 V in series.
(c) Height control sensor sub-assembly rear LH:
Connect terminal 1 (SHB) to the batteries' positive (+) terminal, and terminal 3 (SHG) to the batteries' negative (-) terminal, then apply approximately 4.5 V between terminal 2 (SHRL) and 3 (SHG) in the following conditions.
Standard voltage:
Result:
(d) Height control sensor sub-assembly rear RH:
Connect terminal 1 (SHB) to the batteries' positive (+) terminal, and terminal 3 (SHG) to the batteries' negative (-) terminal, then apply approximately 4.5 V between terminal 1 (SHG) and 2 (SHRR) in the following conditions.
Standard voltage:
Result:
C -- REPLACE HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR RH
B -- REPLACE HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR LH
A -- REPLACE SUSPENSION CONTROL ECU