DTC P18A8-62: Gear Shift Control Module "A"/"B" IGCT-Scene Signal Compare Failure [11/2021 - ]: Procedure

Pre-procedure1

1. Disconnect the B77 shift control actuator assembly (shift actuator ECU) connector.
2. Connect the cable to the negative (-) auxiliary battery terminal.
3. Turn the ignition switch to ON.

   Procedure1

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   B77-5 (IGS1) - Body ground	Ignition switch ON	11 to 14 V

   Result

   Proceed to
   OK
   NG

   Post-procedure1

5. Turn the ignition switch off.
6. Disconnect the cable from the negative (-) auxiliary battery terminal.
7. Reconnect the shift control actuator assembly (shift actuator ECU) connector.

Result: 

OK 

REPLACE SHIFT CONTROL ACTUATOR ASSEMBLY (SHIFT ACTUATOR ECU). Refer to  REMOVAL [11/2021 - ] 

Result: 

NG 

See step  2

Pre-procedure1

1. Remove the IGCT-SCENE relay from the No. 1 luggage room relay block and No. 1 junction block assembly.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	Auxiliary battery voltage not applied between terminals 1 and 2	10 kΩ or higher
   3 - 5	Auxiliary battery voltage applied between terminals 1 and 2	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	IGCT-SCENE Relay

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. Install the IGCT-SCENE relay to the No. 1 luggage room relay block and No. 1 junction block assembly.

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (IGS1 POWER SUPPLY CIRCUIT) 

Result: 

NG 

REPLACE IGCT-SCENE RELAY