C1852

SUSPENSION CONTROL: KINETIC DYNAMIC SUSPENSION SYSTEM: C1851/51: Low Pressure Malfunction in Upside of KDSS System

DTC C1851/51 - Low Pressure Malfunction in Upside of KDSS System

DTC C1852/52 - Low Pressure Malfunction in Downside of KDSS System

DTC C1853/53 - High Pressure Malfunction in Upside of KDSS System

DTC C1854/54 - High Pressure Malfunction in Downside of KDSS System

DESCRIPTION

- The accumulator pressure sensor is located in each of 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.
- The stabilizer control ECU turns on the KDSS indicator light and stops KDSS control when the accumulator pressure sensor detects abnormal pressure in the hydraulic circuit.
HINT: This DTC does not indicate a malfunction in an electrical circuit. This DTC is output when the accumulator pressure sensor detects abnormal pressure in a hydraulic circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE
HINT:
- When these DTCs are output, perform the hydraulic circuit inspection first by following "HOW TO PROCEED WITH TROUBLESHOOTING" Suspension Control System (w/ KDSS).
- If the DTCs cannot be erased even after the hydraulic circuit inspection, perform the electrical circuit inspection by following the procedures below.
- 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 C1851/51, C1852/52, C1853/53 and C1854/54 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 -- REPLACE 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