Hydrogen Filling Control ECU Communication Stop Mode [12/2022 - 12/2023]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the G4 hydrogen fuel control ECU assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G4-13 (CA1H) - G4-14 (CA1L)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR 

Result: 

OK 

See step  2

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G4-32 (E1) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

2. Reconnect the cable to the negative (-) auxiliary battery terminal.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   G4-3 (+BP2) - Body ground	Ignition switch ON	11 to 14 V
   G5-20 (+BP) - Body ground	Ignition switch ON	11 to 14 V
   G4-38 (IGSW) - Body ground	Ignition switch ON	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HYDROGEN FUEL CONTROL ECU ASSEMBLY. Refer to  REMOVAL [12/2022 - 12/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)