DTC P0A51-174: Drive Motor "A" Current Sensor Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result	Proceed to
   P0A51-174 only is output.	A
   Any of the following DTCs are also output.	B

   DTC No.	Relevant Diagnosis
   P0A60 (all INF codes) *1	Drive Motor "A" Phase V Current
   P0A63 (all INF codes) *1	Drive Motor "A" Phase W Current
   P0A78-113, 287, 505, 506	Drive Motor "A" Inverter Performance

   HINT: 

   • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic flowchart.
   • P0A51-174 may be set due to a malfunction which also causes DTCs in the preceding table to be set. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.

B → See step   4 

A: Go to next step 

1. Check the connection of the low voltage connector of the inverter with converter assembly.
   Fig 1: Identifying Inverter With Converter Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

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

   HINT: 

   When connecting the connector, insert it with the locking lever in the raised position. Rotate the lever downward and make sure that the connector is pulled into its socket. When the locking lever is in its fully closed position, a click will be heard as its locking claws engage. After the click is heard, pull up on the connector to confirm that it is properly connected.

NG → CONNECT SECURELY 

OK → See step   3