DTC C1787: EMS Switch Circuit (Test Mode DTC): Procedure

1. Connect Techstream to DLC3.
2. Turn the engine switch on (IG) and turn Techstream main switch on.
3. Select "DATA LIST" mode on Techstream. Refer to DATA LIST / ACTIVE TEST .
   DATA LIST (EMS):
   
   

   Item	Measurement Item/ Range (Display)	Normal Condition	Diagnostic Note
   Damper Force Switch 1	Damper force switch 1/ ON or OFF	The same as absorber control switch position	Operate the absorber control switch

4. Operate the absorber control switch and check its operation in the DATA LIST on Techstream display.

   OK

   The display on Techstream changes according to the operation of the absorber control switch.

NG → See step   3 

OK: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Perform the Test Mode. Refer to TEST MODE PROCEDURE .
3. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   DTC is output	A
   DTC is not output (When troubleshooting accordance with the PROBLEM SYMPTOMS TABLE)	B
   DTC is not output	C

C → END 

B → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE 

A → REPLACE ABSORBER CONTROL ECU 

1. Remove the absorber control switch.
   Fig 1: Identifying Absorber Control Switch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the absorber control switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Resistance

   Tester Connection	Switch Position	Specified Condition
   Switch terminal 4 - Switch terminal 3	NORM	10 kΩ or higher (No Continuity)
   Switch terminal 4 - Switch terminal 3	SPORT	Below 1 Ω (Continuity)

NG → REPLACE ABSORBER CONTROL SWITCH 

OK: Go to next step 

1. Disconnect the absorber control ECU connector.
   Fig 2: Checking Harness And Connector (Absorber Control Switch To Absorber Control ECU, Body Ground)

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

   Resistance

   Tester Connection	Specified Condition
   K72-9 (SW1) - K41-4	Below 1 Ω
   K72-9 (SW1) - Body ground	10 kΩ or higher

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

   Resistance

   Tester Connection	Specified Condition
   K41-3 - Body ground	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Clear the DTC. Refer to DTC CHECK / CLEAR .
2. Perform Test Mode. Refer to TEST MODE PROCEDURE .
3. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

   HINT: 

   Reinstall the sensor, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs.

   Result

   Result	Proceed to
   DTC is output	A
   DTC is not output (When troubleshooting accordance with the PROBLEM SYMPTOMS TABLE)	B
   DTC is not output	C

C → END 

B → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN  PROBLEM SYMPTOMS TABLE 

A → REPLACE ABSORBER CONTROL ECU