DTC P0A1B-94: Drive Motor "A" Control Module Unexpected Operation [12/2022 - ]: Procedure

1. Check the connection of the negative (-) and positive (+) auxiliary battery terminals.

   OK

   The terminals are connected securely and there is no contact problem.

   HINT: 

   If performing a simulation test, turn the ignition switch to ON and shake the wire harnesses vertically and horizontally before checking for DTCs.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  5

Result: 

OK 

See step  2

1. Check the installation condition of the ground wires XA.

   OK

   The ground wires XA are securely installed.

   HINT: 

   If performing a simulation test, turn the ignition switch to ON and shake the wire harnesses vertically and horizontally before checking for DTCs.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  6

Result: 

OK 

See step  3

Pre-procedure1

• None

• Check the IGCT-MAIN NO. 1 relay for improper installation.

  OK

  The relay is installed securely.

  HINT: 

  If performing a simulation test, turn the ignition switch to ON and gently vibrate the IGCT-MAIN NO. 1 relay with a finger before checking for DTCs.

Pre-procedure2

• Remove the IGCT-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	IGCT-MAIN NO. 1 Relay

  Standard Resistance

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

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the IGCT-MAIN NO. 1 relay.

Result: 

NG 

See step  7

Result: 

OK 

See step  4

Pre-procedure1

• None

• Check for DTCs.

  HINT: 

  Check the DTCs that were output when the vehicle was brought to the workshop.

  Powertrain > Motor Generator > Trouble Codes 

  Result

  Result	Proceed to
  P0A1B-94 only is output.	A
  DTCs except P0A1B-94 are output.	B

Post-procedure1

• Turn the ignition switch off.

Result: 

A 

REPLACE INVERTER WITH CONVERTER ASSEMBLY 

Refer to REMOVAL [12/2022 - ]

Result: 

B 

GO TO DTC CHART (HYBRID CONTROL SYSTEM) 

Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2022 - ]

Result

Result: 

NEXT 

See step  8

Result

Result: 

NEXT 

See step  8

Result

Result: 

NEXT 

See step  8

Pre-procedure1

• Read and record the DTCs and Freeze Frame Data.

  Powertrain > Motor Generator > Trouble Codes 

• Clear the DTCs and Freeze Frame Data.

  Powertrain > Motor Generator > Clear DTCs 

  Result

  Proceed to
  NEXT

Post-procedure1

• Turn the ignition switch off and wait for 2 minutes or more.

Result: 

NEXT 

See step  9

Pre-procedure1

• None

• Turn the ignition switch to ON and wait for 2 minutes or more.

  Result

  Proceed to
  NEXT

Post-procedure1

• Turn the ignition switch off.

Result: 

NEXT 

See step  10

Pre-procedure1

• None

• Check for DTCs.

  Powertrain > Motor Generator > Trouble Codes 

  Result

  Result	Proceed to
  No DTCs are output.	A
  P0A1B-94 only is output.	B
  DTCs except P0A1B-94 are output.	C

Post-procedure1

• Turn the ignition switch off.

Result: 

A 

END 

Result: 

B 

REPLACE INVERTER WITH CONVERTER ASSEMBLY 

Refer to REMOVAL [12/2022 - ]

Result: 

C 

GO TO DTC CHART (MOTOR GENERATOR CONTROL SYSTEM)  . Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2022 - ]