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 No. 1 transfer indicator switch (Transfer L4 position switch).

This DTC indicates that the No. 1 transfer indicator switch remains ON.





MONITOR DESCRIPTION

The ECM monitors the No. 1 transfer indicator 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 No. 1 transfer indicator switch:

- No. 1 transfer indicator switch indicates that the L4 transfer-case gears are engaged.

- Transfer high and low shift lever 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 No. 1 transfer indicator switch, illuminates the MIL and stores the DTC.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

The following conditions are common to ON malfunctions (A) and (B).





ON malfunction (A)





ON malfunction (B)





TYPICAL MALFUNCTION THRESHOLDS

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

ON malfunction (A)





ON malfunction (B)





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs Reading and Clearing Diagnostic Trouble Codes.

PROCEDURE

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

(a) Remove the No. 1 transfer indicator switch.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE NO. 1 TRANSFER INDICATOR SWITCH Disassembly
OK -- Continue to next step.

2. CHECK HARNESS AND CONNECTOR (ECM - NO. 1 TRANSFER INDICATOR SWITCH - BODY GROUND)

(a) Install the No. 1 transfer indicator switch.





(b) Disconnect the ECM connector.

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

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE ECM Removal