DTC U0103-87: Lost Communication with Gear Shift Control Module "A" (Hybrid/EV Battery Local Bus) Missing Message [10/2017 - 10/2020]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Enter the following menus: Health Check.
4. Check for DTCs.

   Result

   Result	Proceed to
   DTC P176D-12 does not output.	A
   DTC P176D-12 is output.	B

5. Turn the power switch off.

Result: 

B 

GO TO DTC CHART (P176D-12). Refer to  DTC P176D-12: IG2 Signal (Gear Shift Control Module "A") Circuit Short to Auxiliary Battery [10/2017 - 10/2023] 

Result: 

A 

See step  2

1. Check the connector connections and contact pressure of the relevant terminals for the shift control ECU connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Refer to ELECTRONIC CIRCUIT INSPECTION PROCEDURE [10/2017 - ]

   OK

   The connectors are connected securely and there are no contact pressure problems.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  3

1. Disconnect the G81 shift control ECU connector.
2. Disconnect the e4 battery ECU assembly connector.
3. Disconnect the G92 hybrid vehicle control ECU connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Switch Condition	Specified Condition
   G81-6 (CA2H) - G92-34 (CA4H)	Power switch off	Below 1 Ω
   G81-5 (CA2L) - G92-35 (CA4L)	Power switch off	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Switch Condition	Specified Condition
   G81-6 (CA2H) or G92-34 (CA4H) - Body ground and other terminals (except e4-16 (CA1H))	Power switch off	10 kΩ or higher
   G81-5 (CA2L) or G92-35 (CA4L) - Body ground and other terminals (except e4-15 (CA1L))	Power switch off	10 kΩ or higher

5. Reconnect the G92 hybrid vehicle control ECU connector.
6. Reconnect the e4 battery ECU assembly connector.
7. Reconnect the G81 shift control ECU connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Check that the voltage between the terminals of the sub-battery module assembly is 0 V.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the cable from the negative (-) auxiliary battery terminal.
3. Disconnect the G81 shift control ECU connector.
4. Disconnect the e4 battery ECU assembly connector.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G81-6 (CA2H) - G81-5 (CA2L)	20°C (68°F)	108 to 132 kΩ

6. Reconnect the e4 battery ECU assembly connector.
7. Reconnect the G81 shift control ECU connector.
8. Connect the cable to the negative (-) auxiliary battery terminal.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE HYBRID VEHICLE CONTROL ECU. Refer to  REMOVAL [10/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

Result: 

OK 

See step  5

1. Check that the voltage between the terminals of the sub-battery module assembly is 0 V.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the cable from the negative (-) auxiliary battery terminal.
3. Disconnect the G81 shift control ECU connector.
4. Disconnect the G92 hybrid vehicle control ECU connector.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G81-6 (CA2H) - G81-5 (CA2L)	20°C (68°F)	108 to 132 kΩ

6. Reconnect the G92 hybrid vehicle control ECU connector.
7. Reconnect the G81 shift control ECU connector.
8. Connect the cable to the negative (-) auxiliary battery terminal.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE SHIFT CONTROL ECU. Refer to  REMOVAL [10/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

Result: 

NG 

REPLACE BATTERY ECU ASSEMBLY. Refer to  REMOVAL [10/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020]