DTC B2272: Ignition 1 Monitor Malfunction: Procedure

1. Connect Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn Techstream main switch on.
3. Select the item below in the Data List, and read the display on the tester.

   HINT: 

   When using Techstream with the engine switch off, turn on and off any of the door courtesy light switches repeatedly at 1.5 second intervals or less until communication between the tester and vehicle starts.

   MAIN BODY:
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   IG1 Relay Mon1	Status of IG1 relay monitor (outer) / ON or OFF	ON: Engine switch on (IG) (IG1 relay is ON) OFF: Engine switch off (IG1 relay is OFF)	-

   OK

   "ON" (engine switch on (IG) appears on the screen.

NG → See step   4 

OK: Go to next step 

1. Check the power source mode change.
   1. When the key is inside the vehicle and the shift lever is in the P position, check that pressing the engine switch causes the power source mode to change as follows:

      OK

      off → on (ACC) → on (IG) → off

NG → See step   7 

OK: Go to next step 

1. Delete the DTCs, refer to DTC CHECK / CLEAR .
2. Check for DTCs again.

   OK

   No DTC is output.

NG → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 

OK → See step   8 

1. Remove the IG1 relay from the instrument panel junction block.
   Fig 1: Identifying IG1 Relay Of Instrument Panel Junction Block

   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
   3 - 5	When battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
   3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

NG → REPLACE IG1 RELAY 

OK: Go to next step 

1. Disconnect the 1I junction block connector.
   Fig 2: Identifying 1I Junction Block & D8 ECU Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D8 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   1I-9 - D8-3 (IG1D)	Always	Below 1 Ω
   D8-3 (IG1D) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - MAIN BODY ECU) 

OK: Go to next step 

1. Disconnect the 1F and 1A junction block connectors.
   Fig 3: Identifying 1F And 1A Junction Block 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
   1F-10 - Body ground	Always	Below 1 Ω

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

   Standard voltage

   Tester Connection	Condition	Specified Condition
   1A-1 - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK - BATTERY AND BODY GROUND) 

OK → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK