Toyota Venza: Ignition Hold Monitor Malfunction (B2271)

Toyota Venza Service Manual / Theft Deterrent / Keyless Entry / Smart Key System(for Start Function) / 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.

DTC No.	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 IG1 relay IG2 relay Power management control ECU Main Body ECU (driver side junction block assembly) Engine room relay block Wire harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When the power management control ECU is replaced with a new one and the cable from the negative (-) battery terminal is connected, the power source mode becomes the on (IG) mode. When the battery is removed and reinstalled, the power source mode that was selected when the battery was removed is restored.
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 D43 connector from the power management control ECU.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
D43-1 (AM22) - Body ground	Always	9.5 to 16 V
D43-2 (AM21) - Body ground	Always	9.5 to 16 V

Text in Illustration

*1	Front view of wire harness connector (to Power Management Control ECU)

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

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

(a) Disconnect the D43 connector from the power management control ECU.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
D43-5 (GND2) - Body ground	Always	Below 1 Ω
D43-6 (GND) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Power Management Control ECU)

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

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

(a) Disconnect the 2G connector from the main body ECU (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
D43-20 (IG1D) - 2G-29	Always	Below 1 Ω
D43-20 (IG1D) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connector

(to Power Management Control ECU)

Front view of wire harness connector

(to Main Body ECU (Driver Side Junction Block Assembly))

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER MANAGEMENT CONTROL ECU - DRIVER SIDE JUNCTION BLOCK)

4.	CHECK HARNESS AND CONNECTOR

(a) Disconnect the 2F connector from the main body ECU (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
2F-16 - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to Main Body ECU (Driver Side Junction Block Assembly))

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	INSPECT IG1 RELAY

(a) Remove the IG1 relay from the main body ECU (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
1 - 2	Always	93.8 to 136.4 Ω
3 - 5	When battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

REPLACE IG1 RELAY

6.	INSPECT MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

(a) Remove the main body ECU (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
2G-29 - IG1 relay terminal 2	Always	Below 1 Ω
2G-29 - Body ground	Always	10 kΩ or higher
2F-16 - IG1 relay terminal 1	Always	Below 1 Ω
2F-16 - Body ground	Always	10 kΩ or higher

Text in Illustration

Components without harness connected

(Main Body ECU (Driver Side Junction Block Assembly))

Component without relay connected

(IG1 relay terminal)

Components without harness connected

(Main Body ECU (Driver Side Junction Block Assembly))

REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)

7.	CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - IG2 RELAY)

(a) Disconnect the D42 connector from the power management control ECU.

(b) Remove the IG2 relay from the engine room relay block.

Standard Resistance:

Tester Connection	Condition	Specified Condition
D42-8 (IG2D) - IG2 relay terminal 1	Always	Below 1 Ω
D42-8 (IG2D) - Body ground	Always	10 kΩ or higher

Text in Illustration

Front view of wire harness connected

(to Power Management Control ECU)

Component without relay connected

(IG2 relay terminal)

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

8.	CHECK HARNESS AND CONNECTOR (IG2 RELAY - BODY GROUND)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
IG2 relay terminal 2 - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Component without relay connected (IG2 Relay Terminal)

REPAIR OR REPLACE HARNESS OR CONNECTOR (IG2 RELAY - BODY GROUND)

9.	INSPECT IG2 RELAY

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	Always	93.8 to 136.4 Ω
3 - 5	When battery voltage is not applied to terminals 1 and 2	10 kΩ or higher
3 - 5	When battery voltage is applied to terminals 1 and 2	Below 1 Ω

REPLACE POWER MANAGEMENT CONTROL ECU

REPLACE IG2 RELAY

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