AIR SUSPENSION SYSTEM, Diagnostic DTC:C1752/52
| DTC Code | DTC Name |
|---|---|
| C1752/52 | Compressor Motor Malfunction |
DESCRIPTION
When the "up" side of the height control switch is pressed, a signal is sent from terminal RC of the suspension control ECU to switch the AIR SUS relay on. As a result, the relay contacts close and the compressor motor turns on, producing compressed air.
The suspension control ECU detects the amount of current flowing to the compressor motor by means of the differences in potential at terminals RM+ and RM- of the suspension control ECU. In this way, the suspension control ECU monitors the compressor motor circuit for abnormalities.
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
Warning Indicate |
|---|---|---|---|---|
C1752/52 |
Compressor Motor Malfunction |
With the AIR SUS relay activated, a lock signal of the height control compressor motor is detected for 4 seconds or more. |
|
Indicated |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
When replacing the suspension control ECU, perform registration (Click here).
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
If DTC C1782/82 is output at the same time as C1752/52, perform the inspection necessary for DTC C1782/82 first (Click here).
PROCEDURE
INSPECT SUSPENSION CONTROL RELAY (AIR SUS)
Turn the engine switch off.
Remove the AIR SUS relay from the engine room relay block.
-
*1
AIR SUS Relay
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
3 - 5
12 V battery voltage is not applied to terminal 1 and 2
10 kΩ or higher
12 V battery voltage is applied to terminal 1 and 2
Below 1 Ω
Result
Result
OK
NG
NG REPLACE SUSPENSION CONTROL RELAY (AIR SUS)
CHECK TERMINAL VOLTAGE (POWER SUPPLY)
-
*a
Component without AIR SUS Relay
(Engine Room Relay Block)
Remove the AIR SUS relay from the engine room relay block.
Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection
Condition
Specified Condition
Engine room relay block AIR SUS relay terminal 5 - Body ground
Always
11 to 14 V
Result
Result
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
-
CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR - AIR SUS RELAY/SUSPENSION CONTROL ECU AND BODY GROUND)
Disconnect the S10 height control compressor connector.
Remove the AIR SUS relay from the engine room relay block.
Disconnect the A11 suspension control ECU connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection
Condition
Specified Condition
S10-1 (B) - Engine room relay block AIR SUS relay terminal 3
Always
Below 1 Ω
S10-1 (B) - Body ground
Always
10 kΩ or higher
S10-2 (E) - Body ground
Always
Below 1 Ω
A11-19 (RM+) - S10-3 (RM+)
Always
Below 1 Ω
A11-19 (RM+) - Body ground
Always
10 kΩ or higher
A11-17 (RM-) - S10-4 (RM-)
Always
Below 1 Ω
A11-17 (RM-) - Body ground
Always
10 kΩ or higher
Result
Result
OK
NG
NG REPAIR OR REPLACE HARNESS OR CONNECTOR
INSPECT HEIGHT CONTROL COMPRESSOR (COMPRESSOR MOTOR)
-
*a
Component without harness connected
(Height Control Compressor)
Remove the height control compressor.
Apply 12 V battery voltage to the compressor motor and check the operation of the motor.
OK
Measurement Condition
Specified Condition
12 V battery positive (+) voltage → Terminal 1 (B)
12 V battery negative (-) voltage → Terminal 2 (E)
Motor operates
Note:Do not allow the compressor motor to operate for approximately 90 seconds or more.
If the compressor is shorted, locked or has a similar type of malfunction, a large amount of current is flowing. Therefore, if the motor does not operate, immediately stop this inspection.
Result
Result
OK
NG
-