DTC C1752-52: Compressor Motor Malfunction [08/2015 - 08/2019]: Procedure

See step  2

Result: 

NG 

REPLACE SUSPENSION CONTROL RELAY (AIR SUS) 

Result: 

OK 

See step  2

1. Remove the AIR SUS relay from the engine room relay block.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. 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	Component without AIR SUS Relay (Engine Room Relay Block)

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the S10 height control compressor connector.
2. Remove the AIR SUS relay from the engine room relay block.
3. Disconnect the A11 suspension control ECU connector.
4. 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: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the height control compressor (Refer to REMOVAL [08/2015 - ] ).
2. Apply 12 V battery voltage to the compressor motor and check the operation of the motor.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   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)

   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: 

OK 

REPLACE SUSPENSION CONTROL ECU 

(Refer to REMOVAL [08/2015 - ] )

Result: 

NG 

REPLACE HEIGHT CONTROL COMPRESSOR ASSEMBLY 

(Refer to REMOVAL [08/2015 - ] )