P2772

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

DTC 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 1,000 and 3,000 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

PROCEDURE

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





(a) Remove the transfer L4 position switch.
(b) Measure the resistance when pushing the ball at the tip of the switch.
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, L4 POSITION SWITCH - BODY GROUND)





(a) Install the transfer L4 position switch.
(b) Disconnect the ECM connector.
(c) Measure the resistance when the transfer shift lever is in any position other than the L position.
Standard resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE ECM