DTC C1761: Continuous Electric Current to Height Control Compressor Motor: Procedure

1. Clear the DTC. Refer to DTC CHECK / CLEAR .

NEXT: Go to next step 

1. Check for air leak. Refer to OPERATION CHECK .

   OK

   No leaks.

NG → REPAIR OR REPLACE AIR TUBE 

OK: Go to next step 

1. Remove the front height control valve. Refer to REMOVAL .
2. Check the front height control valve (valve RH).
   Fig 1: Identifying Front Height Control Valve Connector Terminals (Valve RH)

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   1. Apply 12 V battery voltage to the control valve and check the operation of the valve RH.

      OK

      Measurement Condition	Specified Condition
      12 V battery positive (+) → Terminal 1 (RH+) 12 V battery negative (-) → Terminal 2 (E)	It make an operating sound

3. Check the front height control valve (valve LH).
   Fig 2: Identifying Rear Height Control Valve Connector Terminal (Valve LH)

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   1. Apply 12 V battery voltage to the control valve and check the operation of the valve LH.

      OK

      Measurement Condition	Specified Condition
      12 V battery positive (+) → Terminal 3 (LH+) 12 V battery negative (-) → Terminal 2 (E)	It make an operating sound

NG → See step   9 

OK: Go to next step 

1. Remove the rear height control valve. Refer to REMOVAL .
2. Check the rear height control valve (valve RH).
   Fig 3: Identifying Rear Height Control Valve Connector Terminals (Valve RH)

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   1. Apply 12 V battery voltage to the control valve and check the operation of the valve RH.

      OK

      Measurement Condition	Specified Condition
      12 V battery positive (+) → Terminal 1 (+RH) 12 V battery negative (-) → Terminal 2 (E)	It make an operating sound

3. Check the rear height control valve (valve LH).
   Fig 4: Identifying Rear Height Control Valve Connector Terminal (Valve LH)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Apply 12 V battery voltage to the control valve and check the operation of the valve LH.

      OK

      Measurement Condition	Specified Condition
      12 V battery positive (+) → Terminal 3 (+LH) 12 V battery negative (-) → Terminal 2 (E)	It make an operating sound

NG → See step   10 

OK: Go to next step 

1. Remove the height control compressor. Refer to REMOVAL .
2. Inspect if the exhaust valve is stuck.
   Fig 5: Identifying Exhaust Valve Connector Terminals

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   1. Apply 12 V battery voltage to the exhaust valve and check the operation of the valve.

      OK

      Measurement Condition	Specified Condition
      12 V battery positive (+) → Terminal 1 12 V battery negative (-) → Terminal 2	It should make an operating sound (click)

3. Inspect if the compressor is stuck.
   Fig 6: Identifying Height Control Compressor Connector Terminal

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   1. 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 (+) → Terminal 1 (B) 12 V battery negative (-) → Terminal 2 (E)	Motor operates

      NOTE:

      • Do not allow the motor to operate for approximately 60 seconds or more.
      • If the compressor is shorted, locked, or has a similar type of malfunction, a large amount of current will be flowing. Therefore, if the motor does not operate, immediately stop this inspection.

NG → See step   7 

OK: Go to next step 

1. Turn the power switch OFF.
2. Remove the suspension control relay from the engine room No. 5 relay block.
   Fig 7: Identifying Suspension Control Relay And Relay Block

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3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	When 12 V battery voltage is not applied to terminal 1 and 2	10 kΩ or higher
   	When 12 V battery voltage is applied to terminal 1 and 2	Below 1 Ω

NG → REPLACE SUSPENSION CONTROL RELAY 

OK → See step   8