P0A78-504

L110 HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: P0A78-503: Drive Motor "A" Inverter Performance

DTC P0A78-503 - Drive Motor "A" Inverter Performance

DTC P0A78-504 - Drive Motor "A" Inverter Performance

DESCRIPTION

For a description of the inverter, P0A78-266.

MONITOR DESCRIPTION

If the motor inverter detects overvoltage, it transmits an overvoltage signal to the MG ECU. Upon receiving this signal, the hybrid vehicle control ECU will illuminate the MIL and set a DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

COMPONENT OPERATING RANGE

INSPECTION PROCEDURE
CAUTION:
- 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.
- After disconnecting the service plug grip, wait for at least 10 minutes before touching any of the high-voltage connectors or terminals. After waiting, check the voltage at the inspection point in the inverter with converter assembly. The voltage should be 0 V before beginning work.
HINT: Waiting for at least 10 minutes is required to discharge the high-voltage capacitor inside the inverter with converter assembly.

PROCEDURE

1. CHECK DTC OUTPUT
(a) Connect the Techstream to the DLC3.
(b) Turn the power switch on (IG).
(c) Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
(d) Check if DTCs are output.
Result:

HINT: P0A78-503 or 504 may be set due to a malfunction which also causes DTCs in the table above to be set. In this case, first troubleshoot the output DTCs in the table above. Then, perform a test to attempt to reproduce the problems, and check that no DTCs are output.

YES -- GO TO DTC CHART
NO -- Continue to next step.
2. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR)

(a) Check the connection of the low voltage connector of the inverter with converter assembly.
Result:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER)
CAUTION: Be sure to wear insulated gloves.
(a) Turn the power switch off and remove the service plug grip L110 Hybrid Vehicle Control System.
NOTE: After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair procedure because this may cause a malfunction.

(b) Disconnect connector A60 from the inverter with converter assembly.
(c) Turn the power switch on (IG).
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NOTE: Turning the power switch on (IG) with the low voltage connector of the inverter with converter assembly disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
4. CHECK GENERATOR RESOLVER

(a) Turn the power switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):

OK -- CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)
NG -- Continue to next step.
5. CHECK CONNECTOR CONNECTION CONDITION (GENERATOR RESOLVER CONNECTOR)

(a) Check the connection of the generator resolver connector.
Result:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - GENERATOR RESOLVER)
(a) Disconnect connector E87 from the generator resolver.
(b) Turn the power switch off.

Standard resistance (Check for short):

HINT: The generator resolver is not available separately. If it requires replacement, replace the hybrid vehicle transmission assembly.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY
7. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)
CAUTION: Be sure to wear insulated gloves.
(a) Turn the power switch off and remove the service plug grip L110 Hybrid Vehicle Control System.
NOTE: After removing the service plug grip, do not turn the power switch on (READY), unless instructed by the repair procedure because this may cause a malfunction.

(b) Disconnect connector A60 from the inverter with converter assembly.
(c) Turn the power switch on (IG).
(d) Measure the voltage according to the value(s) in the table below.
Standard voltage:

(a) Turn the power switch off.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):

OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY
NG -- Continue to next step.
9. CHECK CONNECTOR CONNECTION CONDITION (MOTOR RESOLVER CONNECTOR)

(a) Check the connection of the motor resolver connector.
Result:
The connector is connected securely and there are no contact problems.
NG -- CONNECT SECURELY
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - MOTOR RESOLVER)
(a) Disconnect connector E88 from the motor resolver.

(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):

Standard resistance (Check for short):

HINT: The motor resolver is not available separately. If it requires replacement, replace the hybrid vehicle transmission assembly.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE HYBRID VEHICLE TRANSMISSION ASSEMBLY