DTC P0A51-174: Drive Motor "A" Current Sensor Circuit [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

CHECK DTC OUTPUT (HYBRID CONTROL)

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

Check for DTCs.

Result

Result	Proceed to
P0A51-174 only is output, or DTCs except the ones in the table below are also 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 procedure.
P0A51-174 may be stored due to a malfunction which causes the DTCs in the preceding table to be stored. In this case, first troubleshoot the output DTCs in the preceding table. Then, perform a reproduction test to check that no DTCs are output.

Turn the power switch off.

B → See step 3

A: Go to next step

CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) See step 4
NG → CONNECT SECURELY

OK → See step 4
GO TO DTC CHART (HYBRID CONTROL SYSTEM). Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2013 - ]
REPLACE INVERTER WITH CONVERTER ASSEMBLY. Refer to COMPONENTS [08/2013 - ]