DTC B2274: ACC Monitor Malfunction: Procedure

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE 

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the 2A and 2D instrument panel junction block assembly connectors.
   Fig 1: Checking 2A & 2D Instrument Panel Junction Block Assembly Connector Terminals

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2A-36 - 2D-7	20°C (68°F)	50.63 to 123.75 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (instrument panel Junction Block Assembly)

NG → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

OK: Go to next step 

1. Disconnect the 2A and 2D instrument panel junction block assembly connectors.
2. Disconnect the D89 power management control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D89-19 (ACCD) - 2A-36	Always	Below 1 Ω
   2D-7 - Body ground	Always	Below 1 Ω
   D89-19 (ACCD) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Connect the power management control ECU connectors.
   Fig 2: Inspecting D89 Power Management Control ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a

   Component with harness connected (Power Management Control ECU)

   -

   -

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   D89-19 (ACCD) - Body ground	Engine switch off	1 V or less
   	Engine switch on (ACC)	8.5 V or higher

NG → See step   6 

OK → SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR)