C1742
SUSPENSION CONTROL: AIR SUSPENSION SYSTEM: C1742/42: Height Control Compressor Circuit
DTC C1742/42 - Height Control Compressor Circuit
DESCRIPTION
The signal from suspension control ECU turns on the AIR SUS relay. At the time, battery voltage is input to height control compressor motor through the AIR SUS relay. The height control compressor motor starts.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. RECONFIRM DTC
(a) Check if DTC C1741/41 is output .
OK:
DTC C1741/41 is output.
Result:
NG -- REPAIR CIRCUIT INDICATED BY OUTPUT CODE
OK -- Continue to next step.
2. INSPECT HEIGHT CONTROL COMPRESSOR
(a) Disconnect the height control compressor motor connector.
(b) Check the operating sound of the compressor motor when battery positive voltage is applied to the terminals.
OK:
Compressor motor operates.
NOTICE:
- Do not operate the height control compressor assembly 60 seconds. or more.
- Since a short and a lock-up inside the height control compressor assembly causes enormous current to flow, stop operation immediately when it does not rotate.
HINT: When a malfunction is found in the height control compressor motor, replace the height control compressor assembly.
NG -- REPLACE CONTROL COMPRESSOR ASSEMBLY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (SUSPENSION CONTROL ECU - HEIGHT CONTROL COMPRESSOR MOTOR)
(a) Connect the height control compressor motor connector.
(b) Disconnect the suspension control ECU S14 connector.
(c) Measure the resistance according to the values in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR MOTOR - BODY GROUND)
(a) Measure the resistance according to the values in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR MOTOR - AIR SUS RELAY)
(a) Disconnect the AIR SUS relay from the engine room R/B.
(b) Measure the resistance according to the values in the table below.
Standard resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (AIR SUS RELAY - AIR SUS FUSE)
(a) Measure the voltage according to the values in the table below.
Standard voltage:
Result:
C -- REPAIR OR REPLACE HARNESS OR CONNECTOR
B -- INSPECT HEIGHT CONTROL SOLENOID VALVE
A -- Continue to next step.
7. INSPECT HEIGHT CONTROL SOLENOID VALVE
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position, and push the intelligent tester main switch on.
(c) Select the item below in the ACTIVE TEST, and operate it with the intelligent tester.
AIRSUS:
(d) Check whether the height control solenoid valve has a continuity (will vibrate).
OK:
The solenoid makes sound, and the height control solenoid valve has continuity (will vibrate).
OK -- INSPECT EXHAUST SOLENOID VALVE
NG -- Continue to next step.
8. INSPECT HEIGHT CONTROL SOLENOID VALVE
(a) HEIGHT CONTROL SOLENOID VALVE FRONT RH:
(1) Disconnect the height control solenoid valve connector.
(2) Check the operating sound of the height control solenoid valve when positive battery voltage is applied to the terminals.
OK:
It should make an operating sound (click).
Result:
HINT: When a malfunction is found in the front solenoid valve, replace the height control valve sub-assembly No. 1.
(b) HEIGHT CONTROL SOLENOID VALVE FRONT LH:
(1) Disconnect the height control solenoid valve connector.
(2) Check the operating sound of the height control solenoid valve when positive battery voltage is applied to the terminals.
OK:
It should make an operating sound (click).
Result:
HINT: When a malfunction is found in the front solenoid valve, replace the height control valve sub-assembly No. 1.
(c) HEIGHT CONTROL SOLENOID VALVE REAR RH:
(1) Disconnect the height control solenoid valve connector.
(2) Check the operating sound of the height control solenoid valve when positive battery voltage is applied to the terminals.
OK:
It should make an operating sound (click).
Result:
HINT: When a malfunction is found in the rear solenoid valve, replace the height control valve sub-assembly No. 2.
(d) HEIGHT CONTROL SOLENOID VALVE REAR LH:
(1) Disconnect the height control solenoid valve connector.
(2) Check the operating sound of the height control solenoid valve when positive battery voltage is applied to the terminals.
OK:
It should make an operating sound (click).
Result:
HINT: When a malfunction is found in the rear solenoid valve, replace the height control valve sub-assembly No. 2.
C -- REPLACE HEIGHT CONTROL VALVE SUB-ASSEMBLY NO.2
B -- REPLACE HEIGHT CONTROL VALVE SUB-ASSEMBLY NO.1
A -- Continue to next step.
9. INSPECT EXHAUST SOLENOID VALVE
(a) Disconnect the exhaust solenoid valve connector.
(b) Check the operating sound of the exhaust solenoid valve when positive battery voltage is applied to the terminals.
OK:
It should make an operating sound (click).
HINT: When a malfunction is found in the exhaust solenoid valve, replace the height control compressor assembly.
Result:
C -- REPLACE HEIGHT CONTROL COMPRESSOR ASSEMBLY
B -- INSPECT TANK SOLENOID VALVE
A -- Continue to next step.
10. INSPECT TANK SOLENOID VALVE
(a) Connect the intelligent tester to the DLC3.
(b) Turn the ignition switch to the ON position, and push the intelligent tester main switch on.
(c) Select the item below in the ACTIVE TEST, and operate it with the intelligent tester.
AIRSUS:
(d) Check whether the tank solenoid valve has a continuity (will vibrate).
OK:
The solenoid makes sound, and the tank solenoid valve has a continuity (will vibrate).
OK -- INSPECT FOR CLOGGED AIR TUBE
NG -- REPLACE PNEUMATIC W/TUBE TANK ASSEMBLY
11. INSPECT TANK SOLENOID VALVE
(a) Disconnect the exhaust solenoid valve connector.
(b) Check the operating sound of the tank solenoid valve when positive battery voltage is applied to the terminals.
OK:
The solenoid makes sound, and the tank solenoid valve has a continuity (will vibrate).
HINT: When a malfunction is found in the tank solenoid valve, replace the pneumatic tank assembly.
NG -- REPLACE PNEUMATIC W/TUBE TANK ASSEMBLY
OK -- Continue to next step.
12. INSPECT FOR CLOGGED AIR TUBE
(a) Check visually for a clog, damage or breakage on the air tube .
NG -- REPAIR OR REPLACE AIR TUBE
OK -- REPLACE SUSPENSION CONTROL ECU