Toyota Tundra Service Manual: Four Wheel Drive (4WD) Low Switch Circuit Range / Performance (P2772)

Toyota Tundra Service Manual / Engine, Hybrid System / Wf1am Transfer / Touch Select 2-4 And High-low System / Four Wheel Drive (4WD) Low Switch Circuit Range / Performance (P2772)

DESCRIPTION

When the transfer is switching between 4H and 4L, the H4 and L4 terminals of the transfer indicator switch are in one of the ON/OFF combinations listed in the table below.

Terminal

In 4H

Switching between 4H and 4L

In 4L

H4

OFF (OPEN)

ON (GND)

ON (GND)

L4

OFF (OPEN)

OFF (OPEN)

ON (GND)

This DTC is detected when the 4WD HIGH position and 4WD LOW position judgment signals do not match.

DTC Code

DTC Detection Condition

  1. Diagnosis Condition
  2. Malfunction Status
  3. Malfunction Time
  4. Other

Trouble Area

P2772
  1. Ignition switch is ON and engine is running
  2. H4 terminal signal is OFF (OPEN) and L4 terminal signal is ON (GND)
  3. 1 second or more
  4. 1 trip detection logic
  • Wire harness and connector
  • 4 wheel drive control ECU
  • Transfer indicator switch

WIRING DIAGRAM

PROCEDURE

1.

CHECK HARNESS AND CONNECTOR (4 WHEEL DRIVE CONTROL ECU - TRANSFER INDICATOR SWITCH)

(a) Disconnect the A26 4 wheel drive control ECU connector.

(b) Disconnect the D70 transfer indicator switch connector.

(c) Disconnect the A24 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A26-13 (L4) - D70-2 (L4)

Always

Below 1 Ω

A26-12 (H4) - D70-1 (H4)

Always

Below 1 Ω

A26-13 (L4), D70-2 (L4) or A24-21 (L4) - Body ground

Always

10 kΩ or higher

A26-12 (H4) or D70-1 (H4) - Body ground

Always

10 kΩ or higher

A26-13 (L4), D70-2 (L4) or A24-21 (L4) - A26-12 (H4) or D70-1 (H4)

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

2.

CHECK 4 WHEEL DRIVE CONTROL ECU (ECU OUTPUT VOLTAGE)

(a) Disconnect the A24 ECM connector.

(b) Disconnect the transfer indicator switch connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

D70-2 (L4) - Body ground

Ignition switch ON

4 to 6 V

D70-1 (H4) - Body ground

Ignition switch ON

4 to 6 V
Text in Illustration

*a

Front view of wire harness connector

(to Transfer Indicator Switch)

NOTICE:

Turning the ignition switch on with the ECM connector disconnected causes other DTCs to be stored. Clear the DTCs after performing this inspection.

OK

REPLACE TRANSFER INDICATOR SWITCH

NG

REPLACE 4 WHEEL DRIVE CONTROL ECU

    System Voltage (P0560)

    Parts Location

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