Dtc C1752/52 Compressor Motor Malfunction
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT SUSPENSION CONTROL RELAY (AIR SUS)
CHECK TERMINAL VOLTAGE (POWER SUPPLY)
CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR - AIR SUS RELAY/SUSPENSION CONTROL ECU)
INSPECT HEIGHT CONTROL COMPRESSOR (COMPRESSOR MOTOR)
DTC 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 Code
| DTC Detection Condition
| Trouble Area
|
C1752/52
| With the AIR SUS relay activated, a lock signal of the height control compressor motor is detected for 4 seconds or more.
| - AIR SUS fuse
- Harness or connector
- Height control compressor
- Suspension control ECU
|
WIRING DIAGRAM
INSPECTION PROCEDURE
- NOTICE:
- When replacing the suspension control ECU, perform registration (LandCruiser RM000003X4500TX.html).
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
- HINT:
- If DTC C1782/82 is output at the same time as C1752/52, perform the inspection necessary for DTC C1782/82 first (LandCruiser RM000001N9301JX.html).
| 1.INSPECT SUSPENSION CONTROL RELAY (AIR SUS) |
Turn the ignition switch off.
Remove the AIR SUS relay from the engine room relay block.
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
|
Text in Illustration*1
| AIR SUS Relay
|
| | REPLACE SUSPENSION CONTROL RELAY (AIR SUS) |
|
|
| 2.CHECK TERMINAL VOLTAGE (POWER SUPPLY) |
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
|
Text in Illustration*A
| except 1GD-FTV with Urea SCR System
|
*B
| for 1GD-FTV with Urea SCR System
|
*a
| Component without AIR SUS Relay
(Engine Room Relay Block)
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 3.CHECK HARNESS AND CONNECTOR (HEIGHT CONTROL COMPRESSOR - AIR SUS RELAY/SUSPENSION CONTROL ECU) |
Disconnect the S11 height control compressor connector.
Remove the AIR SUS relay from the engine room relay block.
Disconnect the A14 suspension control ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
Tester Connection
| Condition
| Specified Condition
|
S11-1 (B) - Engine room relay block AIR SUS relay terminal 3
| Always
| Below 1 Ω
|
S11-1 (B) - Body ground
| Always
| 10 kΩ or higher
|
S11-2 (E) - Body ground
| Always
| Below 1 Ω
|
A14-19 (RM+) - S11-3 (RM+)
| Always
| Below 1 Ω
|
A14-19 (RM+) - Body ground
| Always
| 10 kΩ or higher
|
A14-17 (RM-) - S11-4 (RM-)
| Always
| Below 1 Ω
|
A14-17 (RM-) - Body ground
| Always
| 10 kΩ or higher
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.INSPECT HEIGHT CONTROL COMPRESSOR (COMPRESSOR MOTOR) |
Remove the height control compressor (LandCruiser RM000002BGX00QX.html).
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
|
Text in Illustration*a
| Component without harness connected
(Height Control Compressor)
|
- NOTICE:
- 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.
