P0a78 287 ошибка на лексусе

for Preparation Click here

DESCRIPTION

For a description of the inverter (Click here).
If an abnormal amount of current flows through the motor inverter, the MG ECU detects it and sends a signal to inform the power management control ECU of the malfunction.

HINT:

The term «drive motor A» indicates MG2.

1. *: The inverter with converter assembly is suspected to be the main cause of the malfunction.

MONITOR DESCRIPTION

P0A78 (INF 287):
If excessive amperage flows through the motor inverter due to an internal short, the motor inverter will transmit an inverter fail signal to the MG ECU. Upon receiving this information, the power management control ECU will illuminate the MIL and set a DTC.
P0A78 (INF 807):
The MG ECU monitors the motor inverter electric current. If the current exceeds the threshold level for a specified period of time, the power management control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

CONFIRMATION DRIVING PATTERN

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG) and turn the Techstream on.
3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
4. Turn the ignition switch off and wait for 30 seconds or more.
5. Turn the ignition switch to ON (IG) and turn the Techstream on.
6. Turn the ignition switch to ON (READY).
7. With the shift lever in P, wait for 5 seconds. [A]

   HINT:

   Check that there are no abnormalities (abnormal sounds, coolant leaks, DTC output, etc).

8. Perform a road test according to the freeze frame data «Vehicle Spd» for approximately 10 minutes. [B]
9. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes. [C]
10. Read the current DTCs.

    HINT:

    1. If a current DTC is output, the system is malfunctioning.
    2. If a current DTC is not output and want to confirm permanent DTC, perform the following procedure.
11. Check that permanent DTCs are cleared. If no permanent DTC is output, the system is normal.
12. If the permanent DTCs are not cleared, perform a universal trip, and then check for permanent DTCs again.

INSPECTION PROCEDURE

CAUTION:

1. Before inspecting the high-voltage system or disconnecting the low voltage connector of the inverter with converter assembly, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
2. After removing the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting for 10 minutes, check the voltage at the terminals in the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work (Click here).

   HINT:

   Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

NOTICE:

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work (Click here).

HINT:

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.

1. Turn the ignition switch to ON (READY) and wait for 5 seconds or more.
2. Perform a road test according to the freeze frame data and item «Vehicle Spd» for approximately 10 minutes.

1.CHECK DTC OUTPUT (HYBRID CONTROL)

1. Connect the Techstream to the DLC3.

1. Turn the ignition switch to ON (IG).

1. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

1. Check if DTCs are output.

   Result:

   Result	Proceed to
   P0A78-202 is not output.	A
   P0A78-202 is also output.	B

   NOTICE:

   1. If P0A78-202 is output, troubleshoot it first. After completing the troubleshooting for P0A78-202, return to perform troubleshooting for this DTC.
   2. Parts repaired or replaced during troubleshooting for P0A78-202 do not need to be re-inspected in this diagnosis procedure.

1. Turn the ignition switch off.

B

A

2.CHECK DTC OUTPUT (HYBRID CONTROL)

1. Connect the Techstream to the DLC3.

1. Turn the ignition switch to ON (IG).

1. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.

1. Check if DTCs are output.

   HINT:

   1. If P0A78-202 was not output in step 1 of this diagnosis procedure, check Table 1 below.
   2. If P0A78-202 was output in step 1 of this diagnosis procedure, repair that DTC first, then check Table 2 below.

   Result:

   Result	Proceed to
   Only P0A78-287 or 807 is output, or DTCs other than the ones in the table below are also output.	A
   Any of the following DTCs are also output.	B

   Table 1 
   

   DTC No.	Relevant Diagnosis
   P0A1A (all INF codes)*1	Generator Control Module
   P0A1B (all INF codes)*1	Drive Motor «A» Control Module
   P0A1D (all INF codes)*1	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
   P0A60 (all INF codes)*1	Drive Motor «A» Phase V Current
   P0A63 (all INF codes)*1	Drive Motor «A» Phase W Current
   P0A72 (all INF codes)*1	Generator Phase V Current
   P0A75 (all INF codes)*1	Generator Phase W Current
   P0A78-266, 267, 586	Drive Motor «A» Inverter Performance
   P0A94-585, 587, 589, 590	DC / DC Converter Performance
   P0C76-523	Hybrid Battery System Discharge Time Too Long

   Table 2 
   

   DTC No.	Relevant Diagnosis
   P0A1A (all INF codes)*1	Generator Control Module
   P0A1B (all INF codes)*1	Drive Motor «A» Control Module
   P0A1D (all INF codes)*1	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
   P0A60-294	Drive Motor «A» Phase V Current
   P0A63-302	Drive Motor «A» Phase W Current
   P0A72 (all INF codes)*1	Generator Phase V Current
   P0A75 (all INF codes)*1	Generator Phase W Current
   P0A78-266, 267, 586	Drive Motor «A» Inverter Performance
   P0A94-585, 587, 589, 590	DC / DC Converter Performance
   P0C76-523	Hybrid Battery System Discharge Time Too Long

   HINT:

   1. *1: If any INF codes are output for this DTC, refer to the corresponding diagnostic procedure.
   2. P0A78-287 or P0A78-807 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.

1. Turn the ignition switch off.

B	GO TO DTC CHART (HYBRID CONTROL SYSTEM) (Click here)

A

3.CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

CAUTION:

Be sure to wear insulated gloves.

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

   NOTICE:

   After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair manual because this may cause a malfunction.

1. Check the connector connections and contact pressure of the low voltage connectors of the inverter with converter assembly (Click here).

   NOTICE:

   Before disconnecting the connector, confirm that it is properly connected by checking that the locking claws are engaged and that the connector does not pull out.

   OK:

   The connectors are connected securely and there are no contact pressure 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

OK
REPLACE INVERTER WITH CONVERTER ASSEMBLY (Click here)