C1812

SUSPENSION CONTROL: KINETIC DYNAMIC SUSPENSION SYSTEM: C1812/12: Pressure Sensor Malfunction / Upside

DTC C1812/12 - Pressure Sensor Malfunction / Upside

DTC C1813/13 - Pressure Sensor Malfunction / Downside

DESCRIPTION

- The accumulator pressure sensors are located in the upper and lower chambers of the cylinder. This sensor detects the pressure in the hydraulic circuit and sends a signal to the stabilizer control ECU.
- This DTC indicates a malfunction in the accumulator pressure sensor and does not indicate abnormal pressure in the hydraulic circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT: 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 the Techstream on.
(c) Select the item below in the Data List, and read its value displayed on the Techstream.

KDSS:





(d) Check the pressure.
Standard:
2.6 to 3.0 MPa when vehicle is stopped and fluid temperature is 20°C
NG -- CHECK ANY OTHER DTCS OUTPUT (DTC C1761/61, C1774/74)
OK -- REPLACE STABILIZER CONTROL ECU
2. CHECK ANY OTHER DTCS OUTPUT (DTC C1761/61, C1774/74)
(a) Check if DTC C1761/61 or C1774/74 is output Kinetic Dynamic Suspension System.
Result:





HINT:
- If any other codes besides C1812/12 and C1813/13 are output, perform troubleshooting for those DTCs first.
- DTC C1761/61 indicates a Stabilizer Control ECU malfunction.
- DTC C1774/74 indicates a low battery positive voltage malfunction.
- If DTCs C1761/61 and C1774/74 are output at the same time, perform troubleshooting necessary for DTC C1774/74 first.

B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
A -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (STABILIZER CONTROL ECU - ACCUMULATOR PRESSURE SENSOR)





(a) Disconnect the S34 connector from the stabilizer control ECU.
(b) Disconnect the A39 connector from the accumulator pressure sensor.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Accumulator pressure sensor No. 1 (Upper Chamber Side)










(d) Disconnect the S35 and S36 connectors from the stabilizer control ECU.
(e) Disconnect the A40 connector from the accumulator pressure sensor.
(f) Measure the resistance according to the value(s) in the table below.
Standard resistance:
Accumulator pressure sensor No. 2 (Lower Chamber Side)






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (STABILIZER CONTROL ECU - ACCUMULATOR PRESSURE SENSOR)
OK -- Continue to next step.
4. INSPECT STABILIZER CONTROL ECU





(a) Connect the S34, S35 and S36 connectors to the stabilizer control ECU.
(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPLACE STABILIZER CONTROL ECU
OK -- Continue to next step.
5. INSPECT ACCUMULATOR PRESSURE SENSOR





(a) Connect 3 dry batteries of 1.5 V in series.
(b) Connect terminal 1 (Vcc) to the battery positive (+) terminal, and terminal 3 (GND) to the battery negative (-) terminal, then measure the voltage between terminals 2 (Vout) and 3 (GND) in the following conditions.
Standard voltage:





NOTE: Do not apply more than 6 V.

NG -- REPLACE ACCUMULATOR PRESSURE SENSOR
OK -- REPLACE STABILIZER CONTROL ECU