± DIAGNOSTICSAUTOMATIC TRANSMISSION
DI±685
879 Author: Date:
2005 SEQUOIA (RM1146U)
DTC P2772 Transfer L4 SW Circuit
CIRCUIT DESCRIPTION
The ECM detects the signal from the transfer L4 position switch.
This DTC indicates that the transfer L4 position switch remains ON.
DTC No.DTC Detecting ConditionTrouble Area
P2772
Transfer L4 position switch remains ON while vehicle running
under conditions for 18 seconds or more (1±trip detection log-
ic)
(a) Output shaft speed 3000 rpm or less
(b) Transfer shift position is HShort in transfer L4 position switch circuit
Transfer L4 position switch
4WD control ECU
ECM
MONITOR DESCRIPTION
The ECM monitors the transfer±case L4 position switch to determine when the transfer±case L4 gear is en-
gaged. 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:
L4 switch indicated that the L4 transfer±case gears are engaged.
Transfer±case shifter is in the ºHº position.
Transfer±case output shaft rpm is between 750 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 L4 switch,
and illuminate the MIL and store the DTC.
MONITOR STRATEGY
Related DTCsP2772Transfer L4 position switch/ON malfunction
Required sensors/ComponentsTransfer L4 position switch
Frequency of operationContinuous
DtiON malfunction (A)1.8 sec.DurationON malfunction (B)0.5 sec.
MIL operation1 driving cycle
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
All:
Output speed sensor circuitNot circuit malfunction
Vehicle speed sensor circuitNot circuit malfunction
Transfer neutral position switchOFF
ON malfunction (A)
Output speed (Transfer output speed)1,000 to 3,000 rpm
ON malfunction (B)
Output speed (Transfer output speed)143 rpm or more±
DIDJQ±01
