DTC B2271: Ignition Hold Monitor Malfunction: Procedure

1. Disconnect the F52 connector from the power management control ECU.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F52-1 (AM22) - Body ground	Always	11 to 14 V
   F52-2 (AM21) - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - POWER MANAGEMENT CONTROL ECU) 

OK: Go to next step 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F52-6 (GND) - Body ground	Always	Below 1 Ω
   F52-5 (GND2) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND) 

OK: Go to next step 

1. Remove the engine room relay block.
   Fig 1: Identifying Engine Room Relay 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
   1A-2 - 1A-3	20°C (68°F)	130 to 230 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Engine Room Relay Block)

NG → REPLACE NO. 1 INTEGRATION RELAY 

OK: Go to next step 

1. Remove the instrument panel junction block assembly.
   Fig 2: Identifying Instrument Panel Junction Block Assembly

   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
   2B-25 - 2B-4	20°C (68°F)	101.25 to 123.75 Ω
   2B-25 - 2B-6	20°C (68°F)	101.25 to 123.75 Ω
   2B-4 - 2B-6	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Component without harness connected (Instrument Panel Junction Block Assembly)

NG → See step   10 

OK: Go to next step 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F52-20 (IG1D) - 2B-25	Always	Below 1 Ω
   F52-20 (IG1D) - Body ground	Always	10 kΩ or higher

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.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2B-4 - Body ground	Always	Below 1 Ω
   2B-6 - Body ground	Always	Below 1 Ω

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

OK: Go to next step 

1. Disconnect the F51 connector from the power management control ECU.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F51-8 (IG2D) - 1A-2	Always	Below 1 Ω
   F51-8 (IG2D) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - IG2 RELAY) 

OK: Go to next step 

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1A-3 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK - BODY GROUND) 

OK: Go to next step 

1. Install the instrument panel junction block assembly.
   Fig 3: Identifying F51 And F52 Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Install the engine room relay block.
3. Reconnect the F51 and F52 connectors.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F51-8 (IG2D) - Body ground	Power switch on (IG)	Output voltage at terminal AM21 or AM22 is -2 V or more
   F52-20 (IG1D) - Body ground	Power switch on (IG)	Output voltage at terminal AM21 or AM22 is -2 V or more

   TEXT IN ILLUSTRATION
   
   

   *1	Component with harness connected (Power Management Control ECU)

NG → See step   11 

OK → See step   12