DTC P31D1-359: Parking Lock Enabling Signal Circuit Range / Performance; DTC P31D2-357: Parking Lock Enabling Signal Circuit Low; DTC P31D3-358: Parking Lock Enabling Signal Circuit High [09/2013 - ]: Procedure

NG → CONNECT SECURELY 

OK: Go to next step 

1. Check the connector connection and contact pressure of the relevant terminals for the skid control ECU connector. Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [09/2013 - ] .

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The connector is connected securely and there are no contact pressure problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Disconnect connector A56 from the power management control ECU.
2. Disconnect connector A19 from the skid control ECU.
3. Turn the power switch on (IG).
4. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A56-32 (ILK) - Body ground	Power switch on (IG)	Below 1 V

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Power Management Control ECU)
   *b	Front view of wire harness connector (to Skid Control ECU)

   NOTE:

   Turning the power switch on (IG) with the power management control ECU and skid control ECU connectors disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

5. Turn the power switch off.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   A56-32 (ILK) - A19-21 (EXO)	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   A56-32 (ILK) or A19-21 (EXO) - Body ground and other terminals	Power switch off	10 kΩ or higher

7. Connect the skid control ECU connector.
8. Connect the power management control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect connector A19 from the skid control ECU.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A56-32 (ILK) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Power Management Control ECU)

   NOTE:

   Turning the power switch on (IG) with the skid control ECU connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

4. Turn the power switch off.
5. Connect the skid control ECU connector.

NG → See step   6 

OK: Go to next step 

1. Turn the power switch on (IG).
2. Connect an oscilloscope between the power management control ECU terminals specified in the table below, and measure the waveform.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Item	Content
   Terminal	A56-32 (ILK) - E117-6 (E1)
   Equipment Setting	5 V/DIV., 50 ms/DIV.
   Condition	Power switch on (IG), vehicle stopped

   Result

   Result	Proceed to
   Parking lock enabling signal waveform appears.	A
   Parking lock enabling signal waveform does not appear.	B

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Power Management Control ECU)

3. Turn the power switch off.

B → REPLACE SKID CONTROL ECU (BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY) 

A → See step   6