DTC B2271: Ignition Hold Monitor Malfunction: Procedure

1. Disconnect the L5 and L6 connectors 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
   L5-1 (AM22) - Body ground	Always	9.5 to 16 V
   L6-7 (AM21) - Body ground	Always	9.5 to 16 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.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L5-5 (E01) - Body ground	Always	Below 1 Ω
   L5-6 (E1) - Body ground	Always	Below 1 Ω
   L6-4 (E12) - Body ground	Always	Below 1 Ω
   L6-5 (E02) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the No. 2 integration relay. Refer to REMOVAL .
   Fig 1: Measuring Resistance Of No. 2 Integration Relay (IG2 Relay) With 1A Connector End View

   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
   
   

   *a	Component without harness connected (No. 2 Integration Relay)

NG → See step   10 

OK: Go to next step 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL .
   Fig 2: Measuring Resistance Of Instrument Panel Junction Block Assembly (IG1 No. 1, IG1 No. 2 And IG1 No. 3 Relays)

   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)	54.32 to 79.32 Ω
   2B-25 - 2B-6	20°C (68°F)	54.32 to 79.32 Ω
   2B-4 - 2B-6	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   11 

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
   L6-2 (IG1D) - 2B-25	Always	Below 1 Ω
   L6-2 (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 

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
   A22-2 (IG2D) - 1A-2	Always	Below 1 Ω
   A22-2 (IG2D) - 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
   1A-3 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Install the instrument panel junction block assembly.
   Fig 3: Checking Voltage Of Power Management Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Install the No. 2 integration relay.
3. Reconnect the A22 and L6 connectors.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A22-2 (IG2D) - Body ground	Power switch on (IG)	Output voltage at terminal AM21 or AM22 is -2 V or more
   L6-2 (IG1D) - Body ground	Power switch on (IG)	Output voltage at terminal AM21 or AM22 is -2 V or more

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   12 

OK → See step   13