DTC P0C76-523: Hybrid Battery System Discharge Time Too Long [08/2013 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Check for DTCs.

   Result

   Result	Proceed to
   P0C76-523 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
   P0A1A-151, 155, 156, 200, 658, 659, 791, 792, 793	Generator Control Module
   P0A1B-163, 164, 168, 193, 511, 661, 786, 794, 795, 796	Drive Motor "A" Control Module
   P0A1D-148	Hybrid Powertrain Control Module
   P0A3F-243	Drive Motor "A" Position Sensor Circuit
   P0A40-500	Drive Motor "A" Position Sensor Circuit Range/Performance
   P0A41-245	Drive Motor "A" Position Sensor Circuit Low
   P0A4B-253	Generator Position Sensor Circuit
   P0A4C-513	Generator Position Sensor Circuit Range/Performance
   P0A4D-255	Generator Position Sensor Circuit Low
   P0A78-266, 267	Drive Motor "A" Inverter Performance
   P0ADC-226	Hybrid Battery Positive Contactor Control Circuit High
   P0AE0-228	Hybrid Battery Negative Contactor Control Circuit High
   P0AE7-224	Hybrid Battery Precharge Contactor Control Circuit High
   P2511-149	ECM/PCM Power Relay Sensor Circuit Intermittent
   P324E-788	MG-ECU Power Relay Intermittent Circuit
   U0110 (all INF codes)*1	Lost Communication with Drive Motor Control Module "A"

   HINT: 

   • *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
   • P0C76-523 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.
5. Turn the power switch off.

B → See step   6 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Check for DTCs.

   Result

   Result	Proceed to
   Any of the following DTCs are also output.	A
   P0C76-523 only is output, or DTCs except the ones in the table below are also output.	B

   DTC No.	Relevant Diagnosis
   P0A78-306	Drive Motor "A" Inverter Performance
   P0A7A-344	Generator Inverter Performance
   P0A90-251, 509	Drive Motor "A" Performance
   P0A92-261, 521	Hybrid Generator Performance

   HINT: 

   When the DTCs listed in the preceding table are also output, there may be a short between the HSDN (MG shut down signal) circuit and power circuit.

5. Turn the power switch off.

B → See step   7 

A: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A33-31 (HSDN) - H1-6 (E1)	Power switch on (IG)	Below 4.5 V

   TEXT IN ILLUSTRATION
   
   

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

3. Turn the power switch off.

NG → See step   4 

OK → See step   7 

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the service information because this may cause a malfunction.

2. Disconnect the A14 inverter with converter assembly connector.
3. Disconnect the A33 power management control ECU connector.
4. Connect the cable to the negative (-) auxiliary battery terminal.
5. Turn the power switch on (IG).
6. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A33-31 (HSDN) or A14-40 (HSDN) - 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 Inverter with Converter Assembly)

   NOTE:

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

7. Turn the power switch off.
8. Disconnect the cable from the negative (-) auxiliary battery terminal.
9. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A33-31 (HSDN) - A33-1 (IG2)	Power switch off	10 kΩ or higher
   A33-31 (HSDN) - A33-2 (IG2D)	Power switch off	10 kΩ or higher
   A33-31 (HSDN) - A33-5 (+B1)	Power switch off	10 kΩ or higher
   A33-31 (HSDN) - A33-6 (MREL)	Power switch off	10 kΩ or higher
   A14-40 (HSDN) - A14-30 (+B)	Power switch off	10 kΩ or higher
   A14-40 (HSDN) - A14-31 (+B2)	Power switch off	10 kΩ or higher

10. Reconnect the A14 inverter with converter assembly connector.
11. Reconnect the A33 power management control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check that the service plug grip is not installed.
   NOTE:

   After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the service information because this may cause a malfunction.

2. Disconnect the A14 inverter with converter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A14-40 (HSDN) - A14-30 (+B)	Power switch off	5 kΩ or higher
   A14-40 (HSDN) - A14-31 (+B2)	Power switch off	5 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (Inverter with Converter Assembly)

4. Reconnect the A14 inverter with converter assembly connector.

NG → See step   7 

OK → See step   8