U0110-657 - Lost Communication with Driver Motor Control Module

L110F HYBRID VEHICLE CONTROL: HYBRID CONTROL SYSTEM: U0110-159,U0110-656,U0110-657: Lost Communication with Driver Motor Control Module
U0110-657 - Lost Communication with Driver Motor Control Module

DESCRIPTION

For a description of the inverter with converter assembly, P0A78.

The inverter with converter assembly (MG ECU) controls MG2 based on commands from the hybrid vehicle control ECU.

The inverter with converter assembly (MG ECU) monitors communication data and detects malfunctions.





WIRING DIAGRAM





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 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.
NOTICE:
If any of DTCs U0110-159, U0110-656, or U0110-657 was set due to incomplete engagement of the connectors, and if the system returns to normal when the power switch is turned on (IG) after clearing the DTCs, DTC P0A1B-788 (power source IC reset) will be set. Proceed to troubleshooting without considering DTC P0A1B-788.

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

PROCEDURE

1. CHECK FUSE (IGCT2 NO. 2)

(a) Check if there is an open circuit in the fuse (IGCT2 NO. 2) in the engine room No. 3 relay block.





OK:

There is no open circuit in the fuse (IGCT2 NO. 2).

NG -- REPLACE FUSE (IGCT2 NO. 2)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY)

(a) Turn the power switch off.





(b) Remove the service plug grip Hybrid Control System.

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

(c) Disconnect the low voltage connector from the inverter with converter assembly.

(d) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(e) Turn the power switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NOTICE:
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 POWER SOURCE CIRCUIT
OK -- Continue to next step.

3. CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)

(a) Connect the low voltage connector of the inverter with converter assembly.





(b) Connect an oscilloscope to the hybrid vehicle control ECU terminals specified in the following table, and measure the waveform.





Result:





HINT
* The shape of the waveform may vary according to communication conditions.
* Since the Techstream cannot measure the CLK+ and CLK- waveform within the appropriate range, use an oscilloscope. Confirm that the oscilloscope being used is able to correctly display the waveform of CLK+ and CLK-.

B -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)
A -- Continue to next step.

4. CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)

(a) Connect an oscilloscope to the hybrid vehicle control ECU terminals specified in the following table, and measure the waveform.









Result:





HINT
The shape of the waveform may vary according to communication conditions.

B -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)
A -- Continue to next step.

5. CHECK HYBRID VEHICLE CONTROL ECU (CHECK WAVEFORM)

(a) Connect an oscilloscope to the hybrid vehicle control ECU terminals specified in the following table, and measure the waveform.









Result:





HINT
The shape of the waveform may vary according to communication conditions.

B -- CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

A -- REPLACE HYBRID VEHICLE CONTROL ECU Components

6. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

CAUTION:
Be sure to wear insulated gloves.

(a) Turn the power switch off.





(b) Check that the service plug grip is not installed.

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

(c) Disconnect the low voltage connector from the inverter with converter assembly (MG ECU).

(d) Disconnect connector A76 from the hybrid vehicle control ECU.

(e) Turn the power switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard voltage:





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

(g) Turn the power switch off.

(h) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

7. CHECK INVERTER WITH CONVERTER ASSEMBLY

(a) Turn the power switch off.





(b) Connect the low voltage connector of the inverter with converter assembly.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Installation

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components

8. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

CAUTION:
Be sure to wear insulated gloves.

(a) Turn the power switch off.





(b) Remove the service plug grip Hybrid Control System.

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

(c) Disconnect connector A76 from the hybrid vehicle control ECU.

(d) Disconnect the low voltage connector from the inverter with converter assembly (MG ECU).

(e) Turn the power switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard voltage:





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

(g) Turn the power switch off.

(h) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

9. CHECK INVERTER WITH CONVERTER ASSEMBLY

(a) Turn the power switch off.





(b) Connect the low voltage connector of the inverter with converter assembly.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Installation

OK -- REPLACE HYBRID VEHICLE CONTROL ECU Components

10. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - INVERTER WITH CONVERTER ASSEMBLY)

CAUTION:
Be sure to wear insulated gloves.

(a) Turn the power switch off.





(b) Remove the service plug grip Hybrid Control System.

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

(c) Disconnect connector A76 from the hybrid vehicle control ECU.

(d) Disconnect the low voltage connector from the inverter with converter assembly (MG ECU).

(e) Turn the power switch on (IG).

(f) Measure the voltage according to the value(s) in the table below.

Standard voltage:





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

(g) Turn the power switch off.

(h) Measure the resistance according to the value(s) in the table below.

Standard resistance (Check for open):





Standard resistance (Check for short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

11. CHECK HYBRID VEHICLE CONTROL ECU

(a) Turn the power switch off.





(b) Connect the hybrid vehicle control ECU connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE HYBRID VEHICLE CONTROL ECU Components

OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Installation

12. REPLACE FUSE (IGCT2 NO. 2)

(a) Replace the fuse (IGCT2 NO. 2) in the engine room No. 3 relay block.





(b) Turn the power switch on (READY).

(c) Check if there is an open circuit in the fuse (IGCT2 NO. 2) in the engine room No. 3 relay block.

OK:

There is no open circuit in the fuse (IGCT2 NO. 2).

HINT
* If no open circuit in the fuse (IGCT2 NO. 2) is found after turning the power switch on (READY), there was long-term deterioration.
* If there is no circuit in the fuse (IGCT2 NO. 2), replace the fuse.

NG -- CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - ENGINE ROOM NO. 3 R/B)

OK -- END

13. CHECK HARNESS AND CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - ENGINE ROOM NO. 3 R/B)

CAUTION:
Be sure to wear insulated gloves.

(a) Turn the power switch off.

(b) Remove the service plug grip Hybrid Control System.

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

(c) Remove the fuse (IGCT2 NO. 2) from the engine room No. 3 relay block.

(d) Disconnect the low voltage connector from the inverter with converter assembly.

(e) Measure the resistance according to the value(s) in the table below.





Standard resistance (Check for open):





Standard resistance (Check for short):





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE INVERTER WITH CONVERTER ASSEMBLY Installation