Air Suspension System

SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1761/61: ECU Malfunction

DTC C1761/61 - ECU Malfunction

DESCRIPTION





INSPECTION PROCEDURE
HINT:
- If DTC C1774/74 (power source circuit) is displayed, perform the inspection necessary for DTC C1774/74 first Air Suspension System.
- If DTC C1713/13 (right rear height control sensor circuit), C1714/14 (left rear height control sensor circuit) and C1761/61 (ECU malfunction) are output at the same time, perform the inspection necessary for DTC C1761/61 first.

PROCEDURE

1. INSPECT HEIGHT CONTROL OFF INDICATOR LIGHT
(a) Turn the ignition switch to ON, and check the height control OFF indicator light.
Result:
A
Height control OFF indicator light come on
B
Height control OFF indicator light does not come on
B -- REPLACE SUSPENSION CONTROL ECU (ECU POWER SOURCE)
A -- Continue to next step.
2. INSPECT SUSPENSION CONTROL ECU (HEIGHT CONTROL SENSOR SUB-ASSEMBLY REAR POWER SOURCE)





(a) Remove the suspension control ECU with connectors being connected.
(b) Turn the ignition switch ON, and measure voltage between terminals S18-20 (SBR2) and S20-1 (GND) and between terminals S18-22 (SBL2) and S20-1 (GND) of the suspension control ECU connector.
Standard voltage:
4.5 to 5.5 V
NG -- REPLACE SUSPENSION CONTROL ECU
OK -- Continue to next step.
3. INSPECT SUSPENSION CONTROL ECU (ACCELERATION SENSOR POWER SOURCE)





(a) Turn the ignition switch ON, and measure voltage between terminals S19-18 (SBR) and S20-1 (GND) and between terminals S19-21 (SBR3) and S20-1 (GND) of the suspension control ECU connector.
Standard voltage:
4.5 to 5.5 V
NG -- CHECK ACCELERATION SENSOR CIRCUIT
OK -- Continue to next step.
4. REPLACE SUSPENSION CONTROL ECU (ECU POWER SOURCE)





(a) Turn the ignition switch OFF, and measure voltage between terminals S19-6 (B) and S20-1 (GND) and between S19-6 (B) and S19-5 (GND2) of the suspension control ECU connector.
Standard voltage:
10 to 14 V
NG -- CHECK POWER SOURCE CIRCUIT
OK -- REPLACE SUSPENSION CONTROL ECU