DTC U0110-160: Lost Communication with Driver Motor Control Module: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Read and record the DTCs and freeze frame data.
4. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
5. Clear the DTCs.

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Select the following menu items: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   DTC U0110-160 is output.

NO → CHECK FOR INTERMITTENT PROBLEMS 

YES: Go to next step 

1. Turn the power switch off and remove the service plug grip. Refer to PRECAUTION .
   NOTE:

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

2. Disconnect connector A60 from the inverter with converter assembly.
3. Disconnect connector A54 from the hybrid vehicle control ECU.
4. Turn the power switch on (IG).
5. Measure the voltage according to the value(s) in the table below.
   Fig 1: Identifying A54 And A60 Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard voltage

   Tester Connection	Specified Condition
   CLK+ (A54-107) - Body ground	Below 1 V
   CLK- (A54-84) - Body ground	Below 1 V
   REQ+ (A54-108) - Body ground	Below 1 V
   REQ- (A54-85) - Body ground	Below 1 V
   HTM+ (A54-105) - Body ground	Below 1 V
   HTM- (A54-82) - Body ground	Below 1 V

   NOTE:

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

6. Turn the power switch off.
7. Measure the resistance according to the value(s) in the table below.

   Standard resistance (Check for open)

   Tester Connection	Specified Condition
   CLK+ (A54-107) - CLK+ (A60-39)	Below 1 Ω
   CLK- (A54-84) - CLK- (A60-38)	Below 1 Ω
   REQ+ (A54-108) - REQ+ (A60-29)	Below 1 Ω
   REQ- (A54-85) - REQ- (A60-20)	Below 1 Ω
   HTM+ (A54-105) - HTM+ (A60-27)	Below 1 Ω
   HTM- (A54-82) - HTM- (A60-26)	Below 1 Ω

   Standard resistance (Check for short)

   Tester Connection	Specified Condition
   CLK+ (A54-107) or CLK+ (A60-39) - Body ground	10 kΩ or more
   CLK- (A54-84) or CLK- (A60-38) - Body ground	10 kΩ or more
   REQ+ (A54-108) or REQ+ (A60-29) - Body ground	10 kΩ or more
   REQ- (A54-85) or REQ- (A60-20) - Body ground	10 kΩ or more
   HTM+ (A54-105) or HTM+ (A60-27) - Body ground	10 kΩ or more
   HTM- (A54-82) or HTM- (A60-26) - Body ground	10 kΩ or more

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Turn the power switch off.
2. Connect the connector to the hybrid vehicle control ECU connector.
3. Measure the resistance according to the value(s) in the table below.
   Fig 2: Identifying A60 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard resistance

   Tester Connection	Specified Condition
   CLK+ (A60-39) - CLK- (A60-38)	109 to 139 Ω
   REQ+ (A60-29) - REQ- (A60-20)	109 to 139 Ω
   HTM+ (A60-27) - HTM- (A60-26)	109 to 139 Ω

NG → See step   7 

OK: Go to next step 

1. Turn the power switch off.
2. Connect the connector to the inverter with converter assembly.
3. Disconnect connector A54 from the hybrid vehicle control ECU.
   Fig 3: Identifying A54 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Specified Condition
   CLK+ (A54-107) - CLK- (A54-84)	109 to 139 Ω
   REQ+ (A54-108) - REQ- (A54-85)	109 to 139 Ω
   HTM+ (A54-105) - HTM- (A54-82)	109 to 139 Ω

NG → REPLACE INVERTER WITH CONVERTER ASSEMBLY 

OK: Go to next step 

1. Connect the hybrid vehicle control ECU connectors.
   Fig 4: Identifying Inverter With Converter Assembly Connector A60

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect connector A60 from the inverter with converter assembly.
3. Connect an oscilloscope between the inverter with convertor assembly connector terminals specified in the table below, and measure the waveform.

   Item	Contents
   Terminal	CH1: CLK+ (A60-39) - GND1 (A60-11) CH2: CLK- (A60-38) - GND1 (A60-11) CH1: REQ+ (A60-29) - GND1 (A60-11) CH1: REQ- (A60-20) - GND1 (A60-11) CH1: HTM+ (A60-27) - GND1 (A60-11) CH1: HTM- (A60-26) - GND1 (A60-11)
   Equipment Setting	CH1, 2: 1 V/DIV., 1 μs/DIV. CH3, 4: 1 V/DIV., 1 ms/DIV. CH5, 6: 1 V/DIV., 200 μs/DIV.
   Condition	Power switch on (IG)

   Result

   The waveform appears as shown in the illustration.

   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 → See step   7 

OK → REPLACE INVERTER WITH CONVERTER ASSEMBLY