DTC C1752: Compressor Motor Malfunction [08/2019 - 08/2021]: Procedure

1. Turn the engine switch off.
2. Remove the AIR SUS relay from the engine room relay block.
3. 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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	AIR SUS Relay

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

   *a	Component without AIR SUS Relay (Engine Room Relay Block)

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

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the S10 height control compressor assembly 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

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the height control compressor assembly.

   Refer to REMOVAL [08/2015 - ]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Height Control Compressor Assembly)

2. 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

Result: 

OK 

REPLACE SUSPENSION CONTROL ECU. Refer to  REMOVAL [08/2015 - ] 

Result: 

NG 

REPLACE HEIGHT CONTROL COMPRESSOR ASSEMBLY. Refer to  REMOVAL [08/2015 - ]