P2772

AB60F AUTOMATIC TRANSMISSION / TRANSAXLE: 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 when the transfer-case L4 gears are engaged. If the transfer-case L4 gears remain engaged under the following conditions, the ECM will conclude that there is a malfunction of the L4 position switch, illuminate the MIL and store the DTC:

- The L4 switch indicates that the L4 transfer-case gears are engaged.
- The transfer-case shifter is in the "H4" position.
- The transfer-case output shaft rpm is between 1000 and 3000 rpm.
- The specified time period has elapsed.

MONITOR STRATEGY





TYPICAL ENABLING CONDITIONS

All





ON malfunction (A)





ON malfunction (B)





TYPICAL MALFUNCTION THRESHOLDS

When both conditions below are met: ON malfunction (A) and (B)

ON malfunction (A)





ON malfunction (B)





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - BODY GROUND)





(a) Disconnect the A27 four wheel drive control ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:






NG -- CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - ECM)
OK -- GO TO TRANSFER SYSTEM INSPECTION
2. CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - ECM)





(a) Disconnect the A38 ECM connector.
(b) Disconnect the A27 four wheel drive control ECU connector.
(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