DTC C1745: Exhaust Solenoid Valve Circuit Malfunction: Procedure

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

NEXT: Go to next step 

1. Turn the engine switch off.
2. Connect the Techstream to the DLC3.
3. Turn the engine switch on (IG) and the Techstream on.
4. Enter the following menus: Chassis / Air suspension / Active Test.
5. Check the operation sound of the height control solenoid valve when the solenoid is turned on through the Active Test.
   AIR SUSPENSION
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Exhaust Solenoid	Exhaust solenoid	ON or OFF	Operation of solenoid (clicking sound) can be heard

   OK

   Operation of solenoid (clicking sound) can be heard

NG → See step   4 

OK: Go to next step 

1. Perform a road test.
2. Check for DTC. Refer to DTC CHECK / CLEAR .
   RESULT
   
   

   Condition	Proceed to
   DTC is output	A
   DTC is not output	B

B → See step   8 

A: Go to next step 

1. Turn the engine switch off.
2. Remove the height control compressor. Refer to REMOVAL .
   Fig 1: Inspecting Height Control Compressor (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
   1 - 2	at 20°C (68°F)	10 to 14 Ω

NG → See step   7 

OK: Go to next step 

1. Turn the engine switch off.
2. Disconnect the L88 ECU connector.
3. Disconnect the A56 exhaust solenoid valve connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A56-1 - L88-5 (SLEX)	Always	Below 1 Ω
   A56-1 or L88-5 (SLEX) - Body ground	Always	10 kΩ or higher
   A56-2 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   6