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DI-1270 DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E/A750F for
2UZ-FE)
DIDX4-01
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 Condition Trouble Area
Transfer L4 position switch remains ON while vehicle running
under conditions for 1.8 seconds or more (1-trip detection S Short in transfer L4 position switch circuit
P2772 logic) S Transfer L4 position switch
(a) Output shaft speed 3000 rpm or less S ECM
(b) Transfer shift position is H
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:
S L4 switch indicated that the L4 transfer-case gears are engaged.
S Transfer-case shifter is in the "H" position.
S Transfer-case output shaft rpm is between 750 and 3,000 rpm.
S 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 DTCs P2772 Transfer L4 position switch/ON malfunction
Required sensors/Components Transfer L4 position switch
Frequency of operation Continuous
ON malfunction (A) 1.8 sec.
Duration
D ti
ON malfunction (B) 0.5 sec.
MIL operation 1 driving cycle
Sequence of operation None
TYPICAL ENABLING CONDITIONS
Specification
Item
It
Minimum Maximum
All:
Output speed sensor circuit Not circuit malfunction
Vehicle speed sensor circuit Not circuit malfunction
Transfer neutral position switch OFF
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 -
DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E/A750F for DI-1271
2UZ-FE)
TYPICAL MALFUNCTION THRESHOLDS
Detection criteria Threshold
Both of the following conditions is met: ON malfunctions (A) and (B)
ON malfunction (A)
L4 switch ON
ON malfunction (B)
Actual Transfer gear ratio
0.9 to 1.1
Transfer input speed/Transfer output speed
WIRING DIAGRAM
Except Double Cab: D4
Detection SW J64 ECM
6 (Transfer L4 Position)J/C
13
W-B W-B L-R L-R
IE4 E5 L4
1 2 B B
J13
J/C
II
D14241
Double Cab: D4
Detection SW J64 ECM
J/C (Transfer L4 Position)J/C
D E 6 13
W-B W-B W-B L-R L-R
J56 J55 IE4 E5 L4
1 2 B B
A
J58
J/C
IN
D14245
DI-1272 DIAGNOSTICS - AUTOMATIC TRANSMISSION (A750E/A750F for
2UZ-FE)
INSPECTION PROCEDURE
1 Check harness and connector (transfer L4 position switch - body ground).
Wire Harness Side: PREPARATION:
(Connector Front View): Disconnect the transfer position L4 switch connector.
CHECK:
Measure the resistance according to the value(s) in the table
below.
D4
OK:
Tester Connection Specified Condition
1 - Body ground Below 1
D14209
NG Repair or replace the harness or connector
(See page IN-30).
OK
2 Inspect transfer L4 position switch.
PREPARATION:
2 1 Remove the transfer position L4 switch.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Switch position Tester Connection Specified Condition
Free 1-2 10 k or higher
Pushed in Below 1
Push
Ball
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