Toyota 4Runner manuals

Toyota 4Runner: Ignition Hold Monitor Malfunction (B2271)

DESCRIPTION

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

HINT:

When the power management control ECU is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode is reset to on (IG). When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.

DTC Code

DTC Detection Condition

Trouble Area

B2271

The hold circuit, IG1 relay actuation circuit or IG2 relay actuation circuit inside the power management control ECU is open or shorted.

  • AM2 fuse
  • Main body ECU (Driver side junction block assembly) (IG1 relays)
  • No. 1 integration relay (IG2 relay)
  • Power management control ECU
  • Harness or connector

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

  • When using the Techstream with the engine switch off to troubleshoot: Connect the Techstream to the vehicle and turn a courtesy light switch on and off at 1.5 second intervals until communication between the Techstream and vehicle begins.
  • Before performing the inspection, check that there are no problems related to the CAN communication system and LIN communication system.
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (BATTERY - POWER MANAGEMENT CONTROL ECU)

(a) Disconnect the F80 power management control ECU connector.


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

Standard Voltage:

Tester Connection

Condition

Specified Condition

F80-2 (AM21) - Body ground

Always

9.5 to 14 V

F80-1 (AM22) - Body ground

Text in Illustration

*a

Rear view of wire harness connector

(to Power Management Control ECU)


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

2.

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BODY GROUND)

(a) Disconnect the F80 power management control ECU connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F80-6 (GND) - Body ground

Always

Below 1 Ω

F80-5 (GND2) - Body ground

Text in Illustration

*a

Rear view of wire harness connector

(to Power Management Control ECU)



NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

3.

INSPECT NO. 1 INTEGRATION RELAY (IG2 RELAY)

(a) Remove the No. 1 integration relay.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1C-1 - 1C-3

20°C (68°F)

255 to 387 Ω

Text in Illustration

*a

Component without harness connected

(No. 1 Integration Relay)


NG

REPLACE NO. 1 INTEGRATION RELAY


OK

4.

INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY (IG1 NO. 1, IG1 NO. 2 AND IG1 NO. 3 RELAYS)

(a) Remove the driver side junction block assembly.


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

Standard Resistance:

Tester Connection

Condition

Specified Condition

2C-52 - 2B-4

20°C (68°F)

101.25 to 123.75 Ω

Text in Illustration

*a

Component without harness connected

(Driver Side Junction Block Assembly)


NG

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


OK

5.

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Disconnect the F80 power management control ECU connector.

(b) Disconnect the 2C driver side junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F80-20 (IG1D) - 2C-52

Always

Below 1 Ω

F80-20 (IG1D) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

6.

CHECK HARNESS AND CONNECTOR (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - BODY GROUND)

(a) Disconnect the 2B driver side junction block assembly connector.

(b) 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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

7.

CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - NO. 1 INTEGRATION RELAY)

(a) Disconnect the F81 power management control ECU connector.

(b) Disconnect the 1C No. 1 integration relay connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F81-8 (IG2D) - 1C-1

Always

Below 1 Ω

F81-8 (IG2D) - Body ground

Always

10 kΩ or higher


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

8.

CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)

(a) Disconnect the 1C No. 1 integration relay connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

1C-3 - Body ground

Always

Below 1 Ω


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR


OK

9.

CHECK POWER MANAGEMENT CONTROL ECU

(a) Install the No. 1 integration relay.

(b) Install the driver side junction block assembly.

(c) Connect the power management control ECU connectors.

Text in Illustration

*a

Component with harness connected

(Power Management Control ECU)

-

-

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F81-8 (IG2D) - Body ground

Engine switch off

Below 1 V

Engine switch on (IG)

((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher

F80-20 (IG1D) - Body ground

Engine switch off

Below 1 V

Engine switch on (IG)

((Voltage at terminal AM21 or AM22) minus 2.0 V) or higher


OK

USE SIMULATION METHOD TO CHECK


NG

REPLACE POWER MANAGEMENT CONTROL ECU

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