P2772

A750F AUTOMATIC TRANSMISSION: AUTOMATIC TRANSMISSION SYSTEM: P2772: Four Wheel Drive (4WD) Low Switch Circuit Range / Performance
P2772 - Four Wheel Drive (4WD) Low Switch Circuit Range / Performance

DESCRIPTION

The ECM detects the signal from the transfer L4 position switch.

This DTC indicates that the transfer L4 position switch remains ON.

MONITOR DESCRIPTION

The ECM monitors the transfer-case L4 position switch to determine whether the transfer-case L4 gear is engaged. If the transfer-case L4 gears remain engaged under the following conditions, the ECM determines that there is a malfunction of the L4 position switch:

- L4 switch indicates that the L4 transfer-case gears are engaged.

- Transfer-case shifter is in the "H" position.

- Transfer-case output shaft rpm is between 1000 and 3000 rpm.

- The specified time period has elapsed.

If all of the above conditions are met, the ECM determines that there is a malfunction of the L4 switch, illuminates the MIL and stores the DTC.

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

All

ON Malfunction (A)

ON Malfunction (B)

TYPICAL MALFUNCTION THRESHOLDS

Both of the following conditions are met: ON malfunction (A) and (B)

ON Malfunction (A)

ON Malfunction (B)

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs DTC Check / Clear.

PROCEDURE

1. INSPECT NO. 2 TRANSFER INDICATOR SWITCH (TRANSFER L4 POSITION SWITCH)

(a) Remove the transfer L4 position switch.

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

Standard Resistance:

NG -- REPLACE NO. 2 TRANSFER INDICATOR SWITCH (TRANSFER L4 POSITION SWITCH)
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (ECM - L4 POSITION SWITCH AND BODY GROUND)

(a) Install the transfer L4 position switch.

(b) Disconnect the connector from the ECM.

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

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM