P2772

A750F AUTOMATIC TRANSMISSION: 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 L4 position switch to determine when the transfer L4 gear is engaged. If the transfer L4 gears remain engaged under the following conditions, the ECM will conclude that there is a malfunction of the L4 position switch:

- Transfer L4 position switch indicates that the L4 transfer gears are engaged.
- Transfer shifter is in the "H" position.
- Transfer output shaft rpm is between 1,000 and 3,000 rpm.
- The specified time period has elapsed.

If all of the above conditions are detected, the ECM will conclude that there is a malfunction of the transfer L4 position switch, illuminate the MIL and store 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. CHECK HARNESS AND CONNECTOR (TRANSFER INDICATOR SWITCH - BODY GROUND)




(a) Disconnect the transfer indicator switch No. 1 connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
2. INSPECT TRANSFER INDICATOR SWITCH NO. 1 (L4 POSITION SWITCH)




(a) Remove the transfer indicator switch No. 1.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE TRANSFER INDICATOR SWITCH NO. 1
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (TRANSFER INDICATOR SWITCH - ECM)




(a) Disconnect the ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for open):





(c) Measure the resistance according to the value(s) in the table below.
Standard resistance (Check for short):






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