B2271

Diagnostic trouble codes

DESCRIPTION

This DTC is output when a problem such as an open in the AM2 fuse, an open or short in the wire harness between the fuse and power source control ECU, a short in the IG output circuit inside the power source control ECU, a short between the power source control ECU and relay, and a short in the relay is detected.

HINT:
: When the power source control ECU is replaced with a new one and the negative (-) battery terminal is connected, the power source mode becomes the IG-ON mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC No.	DTC Detection Condition	Trouble Area
B2271	Hold circuit, IG1 relay actuation circuit or IG2 relay actuation circuit inside power source control ECU is open or short	AM2 fuse IG2 relay Cowl side J/B RH Cowl side J/B LH Power source control ECU Wire harness or connector

WIRING DIAGRAM

INSPECTION PROCEDURE

1. INSPECT FUSE (AM2)

Remove the AM2 fuse from the cowl side J/B RH.

Measure the resistance of the fuse.

Standard resistance:

Below 1 Ω

REPLACE FUSE

OK

2. CHECK CONNECTORS

Check that the connectors are securely connected and the terminals are not deformed or loose.

OK:

The connectors are securely connected and the terminals are not deformed or loose.

REPAIR OR REPLACE CONNECTORS

OK

3. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)

Disconnect the J55 ECU connector.

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

Standard voltage:

Tester Connection (Symbols)
Condition
Specified Condition

J55-33 (AM1) - Body ground
Always
10 to 14 V

J55-12 (AM2) - Body ground
Always
10 to 14 V

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

Standard resistance:

Tester Connection (Symbols)
Condition
Specified Condition

J55-6 (GND2) - Body ground
Always
Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4. INSPECT RELAY (IG2)

Remove the IG2 relay from the engine room R/B No.2.

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

Standard 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)

Go to step 10

OK

5. INSPECT JUNCTION BLOCK

RH-IG relay:
1. Disconnect the cowl side J/B RH connectors.
2. Measure the resistance according to the value(s) in the table below.
  
  Standard resistance:
  
  Tester Connection
  Condition
  Specified Condition
  
  RD-6 - RA-5 or RD-7
  Always
  136 to 250 Ω at 20°C (68°F)
  
  RD-6 - Body ground
  Always
  10 kΩ or higher

LH-IG relay:
1. Disconnect the cowl side J/B LH connectors.
2. Measure the resistance according to the value(s) in the table below.
  
  Standard resistance:
  
  Tester Connection
  Condition
  Specified Condition
  
  LD-13 - LD-8 or LD-9
  Always
  68 to 250 Ω at 20°C (68°F)
  
  LD-13 - Body ground
  Always
  10 kΩ or higher

Go to step 10

OK

6. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)

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

Standard resistance:

Tester Connection (Symbols)
Condition
Specified Condition

J55-34 (IG1D) - Body ground
Always
10 kΩ or higher

J55-35 (IG2D) - Body ground
Always
10 kΩ or higher

Go to step 11

OK

7. CHECK WIRE HARNESS (COWL SIDE J/B LH - BODY GROUND)

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

Standard resistance:

Tester Connection
Condition
Specified Condition

LD-13 - Body ground
Always
10 kΩ or higher

Go to step 11

OK

8. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BODY GROUND)

Reconnect the J55 ECU and J/B connectors.

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

Standard voltage:

Tester Connection (Symbols)	Condition	Specified Condition
J55-34 (IG1D) - Body ground	Engine switch off	Below 1 V
J55-34 (IG1D) - Body ground	Engine switch on (IG)	8 to 14 V
J55-35 (IG2D) - Body ground	Engine switch off	Below 1 V
J55-35 (IG2D) - Body ground	Engine switch on (IG)	8 to 14 V

REPLACE POWER SOURCE CONTROL ECU

OK

9. RECHECK FOR DTC

Delete the DTCs (Click here).

Check for DTCs again.

OK:

DTC B2271 is not output.

REPLACE POWER SOURCE CONTROL ECU

CHECK INTERMITTENT PROBLEMS

10. REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU

Replace a faulty relay or J/B and then connect the power source control ECU connector.

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

Standard voltage:

Tester Connection (Symbols)	Condition	Specified Condition
J55-34 (IG1D) - Body ground	Engine switch off	Below 1 V
J55-34 (IG1D) - Body ground	Engine switch on (IG)	8 to 14 V
J55-35 (IG2D) - Body ground	Engine switch off	Below 1 V
J55-35 (IG2D) - Body ground	Engine switch on (IG)	8 to 14 V

REPLACE POWER SOURCE CONTROL ECU

END

11. REPAIR OR REPLACE WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU

Repair or replace a faulty wire harness or connector and then connect the power source control ECU connector.

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

Standard voltage:

Tester Connection (Symbols)	Condition	Specified Condition
J55-34 (IG1D) - Body ground	Engine switch off	Below 1 V
J55-34 (IG1D) - Body ground	Engine switch on (IG)	8 to 14 V
J55-35 (IG2D) - Body ground	Engine switch off	Below 1 V
J55-35 (IG2D) - Body ground	Engine switch on (IG)	8 to 14 V

REPLACE POWER SOURCE CONTROL ECU

END

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)

Tester Connection	Condition	Specified Condition
RD-6 - RA-5 or RD-7	Always	136 to 250 Ω at 20°C (68°F)
RD-6 - Body ground	Always	10 kΩ or higher

Tester Connection	Condition	Specified Condition
LD-13 - LD-8 or LD-9	Always	68 to 250 Ω at 20°C (68°F)
LD-13 - Body ground	Always	10 kΩ or higher