DTC B2272: Ignition 1 Monitor Malfunction: Procedure

1. Connect Techstream to the DLC3.
2. Turn the engine switch on (IG) and press Techstream main switch on.
3. Select the items below in the Data List, and read the displays on the tester.
   POWER SOURCE CONTROL:
   
   

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

   OK

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

   Result

   Condition	Proceed to
   NG	C
   OK (When troubleshooting according to the PROBLEM SYMPTOM TABLE)	B
   OK (When troubleshooting according to the DTC chart)	A

B → PROCEED TO  PROBLEM SYMPTOMS TABLE  NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

C → See step   2 

A → REPLACE POWER SOURCE CONTROL ECU 

1. Remove the IG1 relay from the instrument panel J/B.
   Fig 1: Identifying IG1 Relay Connector Terminals

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

   Resistance

   Tester Connection	Specified Condition
   3 - 5	10 kΩ or higher
   3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

NG → REPLACE RELAY 

OK: Go to next step 

1. Disconnect the II J/B connector.
   Fig 2: Identifying II J/B Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D44 ECU connector.
   Fig 3: Identifying D44 ECU Connector Terminals

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

   Resistance

   Terminal No. (Symbol)	Specified Condition
   II-9 - D44-34 (IG1D)	Below 1 Ω
   D44-34 (IG1D) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the IF and IA J/B connectors.
   Fig 4: Identifying IF and IA J/B Connectors Terminals

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

   Resistance

   Terminal No.	Condition	Specified value
   IF-10 - Body ground	Always	Below 1 Ω

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

   Voltage

   Terminal No.	Condition	Specified value
   IA-1 - Body ground	Always	10 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 5: Identifying Instrument Panel J/B Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Resistance

   Terminal No.	Condition	Specified value
   IF-10 - IG1 relay terminal-1	Always	Below 1 Ω
   II-9 - IG1 relay terminal-2	Always	Below 1 Ω

NG → REPLACE INSTRUMENT PANEL J/B 

OK → REPLACE POWER SOURCE CONTROL ECU