C1713

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1711-C1714: Front Height Control Sensor RH Circuit Malfunction


DESCRIPTION

The height control sensor changes its resistance value based on changes in vehicle height. The suspension control ECU outputs a fixed voltage of 5 V to the height control sensor's SHB terminal. If the sensor's resistance value changes, the sensor's voltage value changes accordingly. The suspension control ECU then inputs the voltage value from the sensor to detect the vehicle height change.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
- Before performing troubleshooting, inspect the connectors of related circuits.
- If DTC C1782 (Power Source Voltage Malfunction) is output at the same time, perform troubleshooting for C1782 first C1782.
- Before replacing the suspension control ECU, perform all of the following again: 1) symptom simulation Electronic Circuit Inspection Procedure; 2) DTC inspection; and 3) the Techstream inspection (Data List or Active Test). If no malfunctions are found in other areas, replace the suspension control ECU.
- If the suspension control ECU or height control sensor is replaced, the vehicle height offset calibration must be performed Programming and Relearning.

PROCEDURE

1. INSPECT HEIGHT CONTROL SENSOR

(a) Check the front height control sensor.

(1) Remove the front height control sensor RH or front height control sensor LH Removal.

NOTICE:
Do not drop the height control sensor. If it is dropped, replace it with a new one.





(2) Connect 3 1.5 V dry cell batteries in series.

(3) Connect the positive (+) end of the batteries to terminal 3 (SHB) of the height control sensor and the negative (-) end of the batteries to terminal 1 (SHG). While slowly moving the sensor's link up and down, measure the voltage between terminal 2 (SHFR*1 or SHFL*2) and terminal 1 (SHG).

HINT
*1: for RH

*2: for LH

(4) Measure the voltage according to the value(s) in the table below.

Standard voltage:

for RH





for LH





NOTICE:
Do not apply a voltage of more than 6 V.

(b) Check the rear height control sensor.

(1) Remove the rear height control sensor RH or rear height control sensor LH Removal.

NOTICE:
Do not drop the height control sensor. If it is dropped, replace it with a new one.





(2) Connect 3 1.5 V dry cell batteries in series.

(3) Connect the positive (+) end of the batteries to terminal 3 (SHB) of the height control sensor and the negative (-) end of the batteries to terminal 1 (SHG). While slowly moving the sensor's link up and down, measure the voltage between terminal 2 (SHRR*1 or SHRL*2) and terminal 1 (SHG).

HINT
*1: for RH

*2: for LH

(4) Measure the voltage according to the value(s) in the table below.

Standard voltage:

for RH





for LH





NOTICE:
Do not apply a voltage of more than 6 V.

Result





E -- REPLACE REAR HEIGHT CONTROL SENSOR LH Removal

D -- REPLACE REAR HEIGHT CONTROL SENSOR RH Removal

C -- REPLACE FRONT HEIGHT CONTROL SENSOR LH Removal

B -- REPLACE FRONT HEIGHT CONTROL SENSOR RH Removal
A -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL SENSOR - SUSPENSION CONTROL ECU)

(a) Check the front height control sensor RH (C1731).

(1) Turn the power switch OFF.

(2) Disconnect the A39 and L88 ECU connectors.

(3) Disconnect the A54 sensor connector.

(4) Measure the resistance according to the value(s) in the table below.





Standard resistance:





(b) Check the front height control sensor LH (C1732).

(1) Turn the power switch OFF.

(2) Disconnect the A39 and L88 ECU connectors.

(3) Disconnect the A4 sensor connector.

(4) Measure the resistance according to the value(s) in the table below.





Standard resistance:





(c) Check the rear height control sensor RH (C1733).

(1) Turn the power switch OFF.

(2) Disconnect the R1 ECU connector.

(3) Disconnect the "A" sensor connector.

(4) Measure the resistance according to the value(s) in the table below.





Standard resistance:





(d) Check the rear height control sensor LH (C1734).

(1) Turn the power switch OFF.

(2) Disconnect the R1 ECU connector.

(3) Disconnect the "B" sensor connector.

(4) Measure the resistance according to the value(s) in the table below.





Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE SUSPENSION CONTROL ECU Removal