DTC C1761/61: ECU Malfunction: Procedure

1. Check DTCs. Refer to DTC CHECK / CLEAR .
   1. Confirm if the DTC C1774/74 is recorded.

      OK

      DTC C1774/74 is not output.

      HINT: 

      • If DTC C1774/74 (power source circuit) is displayed, carry out the inspection necessary. Refer to DTC C1774/74: Power Source Circuit .
      • If DTC C1711/11 (right front height control sensor circuit), C1712/12 (left front height control sensor circuit), C1713/13 (right rear height control sensor circuit), C1714/14 (left rear height control sensor circuit) and C1761/61 (ECU malfunction) is output at the same time, carry out the inspection necessary for DTC C1761/61 first.

NG → REPAIR CIRCUIT INDICATED BY OUTPUT CODE 

OK: Go to next step 

1. Turn the ignition switch to the ON position.
2. Check the height control OFF indicator light.

   OK

   Height control OFF indicator light comes on.

NG → REPLACE SUSPENSION CONTROL ECU 

OK: Go to next step 

1. Disconnect the height control sensor sub-assembly connector.
   Fig 1: Identifying Height Control Sensor Sub-Assembly Connector (1 Of 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 2: Identifying Height Control Sensor Sub-Assembly Connector (2 Of 2)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch ON.
3. Measure the voltage according to the values in the table below.

   Standard resistance (Front RH):

   Tester Connection	Specified Condition
   H13-1 (SHB) - H13-3 (SHG)	4.75 to 5.25 V

   Standard resistance: (Front LH):

   Tester Connection	Specified Condition
   H12-1 (SHG) - H12-3 (SHB)	4.75 to 5.25 V

   Standard resistance: (Rear RH):

   Tester Connection	Specified Condition
   H26-1 (SHG) - H26-3 (SHB)	4.75 to 5.25 V

   Standard resistance: (Rear LH):

   Tester Connection	Specified Condition
   H25-1 (SHB) - H25-3 (SHG)	4.75 to 5.25 V

NG → CHECK HEIGHT CONTROL SENSOR SUB-ASSEMBLY CIRCUIT 

OK: Go to next step 

1. Turn the ignition switch to the OFF position.
2. Disconnect the suspension control ECU S15 connector.
3. Measure the resistance according to the values in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   S15-19 (SBL3) - Body ground	10 kΩ or higher

NG → REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the ignition switch to the OFF position.
2. Measure the voltage according to the values in the table below.

   Standard voltage

   Tester Connection	Specified Condition
   S15-6 (B) - S16-1 (GND)	10 to 14 V
   S15-6 (B) - S15-5 (GND2)	10 to 14 V

NG → CHECK POWER SOURCE CIRCUIT 

OK → REPLACE SUSPENSION CONTROL ECU