DTC C1761: Continuous Electric Current to Height Control Compressor Motor (FROM 08/2009): Procedure

1. Ask the customer about the vehicle and usage conditions when the DTC was stored.

   HINT: 

   DTC 1761 can be stored under unusual vehicle or usage conditions.

   Points to confirm

   Confirm if there were any foreign objects caught between the body and tires. Confirm if the vehicle has been driven on an unpaved surface or with a wheel not contacting the ground. Confirm if the vehicle has been raised with an excess load. Confirm if the vehicle height mode has been continuously changed using the height control switch, causing the vehicle to raise and lower repeatedly.

NEXT: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Start the engine and wait for 4 minutes or more.
3. Select luggage mode.
4. Select HI mode.
5. Check the DTC. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC C1761 is output	A
   DTC C1761 is not output	B
   DTC C1761 and other DTCs are output	C

C → GO TO DTC CHART 

B → END (C1761 WAS OUTPUT DUE TO UNUSUAL VEHICLE OR USAGE CONDITION) 

A: Go to next step 

1. Inspect the air tube for air leaks or clogs. Refer to PRECAUTION .

   OK

   No air leaks or clogs are found in the air tube.

NG → REPAIR OR REPLACE AIR TUBE 

OK: Go to next step 

1. Turn the engine switch off.
2. Disconnect the height control valve No. 1 connector.
   Fig 1: Inspecting Height Control Valve No. 1

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the values in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   3 (RH+) - 2 (E)	15 to 25°C (59 to 77°F)	10 to 14 Ω
   1 (LH+) - 2 (E)	15 to 25°C (59 to 77°F)	10 to 14 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Height Control Valve No. 1)

4. Check the front RH valve.
   1. Connect a positive (+) lead from the battery to terminal 3 (RH+) and a negative (-) lead to terminal 2 (E).
   2. Check the operating sound of the height control valve No. 1.

      OK

      It makes an operating sound (click).

5. Check the front LH valve.
   1. Connect a positive (+) lead from the battery to terminal 1 (LH+) and a negative (-) lead to terminal 2 (E).
   2. Check the operating sound of the height control valve No. 1.

      OK

      It makes an operating sound (click).

NG → See step   11 

OK: Go to next step 

1. Turn the engine switch off.
2. Disconnect the rear height control valve No. 2 connector.
   Fig 2: Inspecting Height Control Valve No. 2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the values in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   1 (RH+) - 2 (E)	15 to 25°C (59 to 77°F)	10 to 14 Ω
   3 (LH+) - 2 (E)	15 to 25°C (59 to 77°F)	10 to 14 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Height Control Valve No. 2)

4. Check the rear RH valve.
   1. Connect a positive (+) lead from the battery to terminal 3 (RH+) and a negative (-) lead to terminal 2 (E).
   2. Check the operating sound of the height control valve No. 2.

      OK

      It makes an operating sound (click).

5. Check the rear LH valve.
   1. Connect a positive (+) lead from the battery to terminal 1 (LH+) and a negative (-) lead to terminal 2 (E).
   2. Check the operating sound of the height control valve No. 2.

      OK

      It makes an operating sound (click).

NG → See step   12 

OK: Go to next step 

1. Turn the engine switch off.
2. Disconnect the exhaust valve connector.
   Fig 3: Inspecting Height Control Compressor Assembly (Exhaust Valve)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   2 (B) - 1 (L)	15 to 25°C (59 to 77°F)	10 to 14 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Exhaust Valve)

4. Inspect if exhaust valve is stuck:
   1. Connect a positive (+) lead from the battery to terminal 2 (B) and a negative (-) lead to terminal 1 (L).
   2. Check the operating sound of the exhaust valve.

      OK

      It makes an operating sound (click).

NG → See step   13 

OK: Go to next step 

1. Turn the engine switch off.
2. Disconnect the low pressure tank valve connector.
   Fig 4: Identifying Low Pressure Tank Valve

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   2 (B) - 1 (L)	15 to 25°C (59 to 77°F)	10 to 14 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Low Pressure Tank Valve)

4. Inspect if the low pressure tank valve is stuck :
   1. Connect a positive (+) lead from the battery to terminal 2 (B) and a negative (-) lead to terminal 1 (L).
   2. Check the operating sound of the low pressure tank valve.

      OK

      It makes an operating sound (click).

NG → See step   14 

OK: Go to next step 

1. Turn the engine switch off.
2. Disconnect the compressor motor connector.
3. Connect a positive (+) lead from the battery to terminal 1 (B) and a negative (-) lead to terminal 2 (E).
   Fig 5: Identifying Positive (+) Lead From The Battery To Terminal 1(B), And A Negative (-) Lead To Terminal 2 (E)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the operating of the compressor motor.

   OK

   Motor operates

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Compressor Motor)

   NOTE:

   • Do not operate the height control compressor for 60 seconds or more.
   • Since a short and a lock-up inside the height control compressor cause excessive current to flow, stop operation immediately when it does not rotate.

NG → See step   15 

OK: Go to next step 

1. Turn the engine switch off.
2. Remove the AIR SUS relay from the engine room J/B.
   Fig 6: Identifying Suspension Control Relay Circuit Diagram

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	When battery voltage is not applied between terminals 1 and 2	10 kΩ or higher
   	When battery voltage is applied between terminals 1 and 2	Below 1 Ω

NG → REPLACE AIR SUS RELAY 

OK → See step   10