DTC C1745: Exhaust Solenoid [08/2019 - 08/2021]: Procedure

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG).
4. Turn the Techstream on.
5. Enter the following menus: Chassis / Air suspension / Active Test.
   AIR SUSPENSION
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Exhaust Solenoid	Exhaust solenoid valve	ON or OFF	The operating sound of the solenoid (clicking sound) can be heard. When the Active Test is performed, Exhaust Solenoid in the Data List changes between ON and OFF accordingly.

   OK

   Operation of solenoid (clicking sound) can be heard.

   Result

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to problem symptoms table)	B
   OK (When troubleshooting according to DTC chart)	C

Result: 

B 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [08/2015 - ] 

Result: 

C 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - 08/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2020 - 08/2021] 

Result: 

A 

See step  2

1. Disconnect the S9 exhaust solenoid valve connector.
2. Disconnect the R22 suspension control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   S9-2 (L) - R22-9 (SLEX)	Always	Below 1 Ω
   S9-2 (L) - Body ground	Always	10 kΩ or higher
   S9-1 (B) - Body ground	Always	Below 1 Ω

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Turn the engine switch off.
2. Remove the height control compressor assembly.

   Refer to REMOVAL [08/2015 - ]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2 (L) - 1 (B)	20°C (68°F)	10 to 14 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component without harness connected (Exhaust Solenoid Valve)

4. Connect the positive (+) lead of the battery to terminal 2 (L) and the negative (-) lead to terminal 1 (B) of the solenoid valve connector. Then check that the valve makes an operating sound.

   OK

   Operation of solenoid (clicking sound) can be heard.

   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 - ]