1996 TOYOTA LAND CRUISER Transmiss

Q07002
20°C and 110 °C
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−155
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check ATF temperature Sensor.
PREPARATION:
Remove the ATF temperature sensor.
CHECK:
Measure the resistance between terminals of the ATF tempera-
ture sensor at 20° C (68°F) and 110 °C (230° F).
OK:
Resistance :
20 °C (68° F): Approx. 12.2 kΩ
11 0 °C (230°F): Approx. 770 Ω
NG Replace ATF temperature sensor.
OK
2 Check harness and connector between ATF temperature sensor and ECM (See page IN−28 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM.
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Q08221 Q08220D00081
(+) (−)
(+) (−)Air
DI−156
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
DTC P0750, P0755 Shift Solenoid A/B Malfunction (Shift Solenoid Valve No. 1/No. 2)
SYSTEM DESCRIPTION
The ECM uses signals from the vehicle speed sensor to detect the actual gea\
r position (1st, 2nd, 3rd or O/D
gear).
Then the ECM compares the actual gear with the shift schedule in the ECM mem\
ory to detect mechanical
trouble of the shift solenoid valves and valve body.
DTC No.DTC Detecting ConditionTrouble Area
P0750
P0755During normal driving, the gear required by the ECM does not
match the actual gear (2 trip detection logic)Shift solenoid valve No. 1/No. 2 is stuck open or closed
 Valve body is blocked up or stuck
HINT:
Check the shift solenoid valve No. 1 when DTC P0750 is output and check shift\
solenoid valve No. 2 when
DTC P0755 is output.
INSPECTION PROCEDURE
1 Check shift solenoid valve No. 1 or No. 2 operation.
PREPARATION:
(a) Remove the oil pan.
(b) Remove the shift solenoid valve No. 1 or No. 2.
CHECK:
(a) Applying 490 kPa (5 kgf/cm2, 71 psi) of compressed air,
check that the shift solenoid valve does not leak air.
(b) When battery positive voltage is supplied to the shift sole-
noid valves, check they opens.
NG Replace shift solenoid valve No. 1 or No. 2.
OK
2 Check valve body (See page DI−147 ).
NG Repair or replace valve body.
OK
Repair transmission (See page AT −18).
DI5KM−02
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Position
NORMALSHIFT SOLENOID NO. 1
MALFUNCTIONING
Solenoid valve
No. 1 No. 2GearSHIFT SOLENOID NO. 2
MALFUNCTIONING
BOTH SOLENOIDS MAL-
FUNCTIONINGSolenoid valve
No. 1 No. 2 GearSolenoid valve
No. 1 No. 2 GearGear when shift selector is
manually operated
D
2
LON
ON
OFF
ON
ON
OFF
OFF OFF
ON
ON OFF
ON
ON
OFF
ON
ON ON OFF 1st
2nd
3rd
O/D
1st
2nd
3rd
1st
2nd X
X
X
X
X
X
X
X
X
ON
ON
OFF
OFF ON
ON
ON
3rd 3rd
O/D
3rd
3rd
1st
2nd X
X
X
X
X
X
X
X
XOFF
OFF
ON
ON OFF OFF
OFF
ON
ON
1st
O/D
3rd 1st O/D O/D
3rd
1st
1st
O/D O/D O/D
O/D
3rd 3rd
3rd
1st
1st
X: Malfunctions ON
ON
3rd
3rd
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−157
1996 LAND CRUISER (RM451U)
DTC P0753, P0758 Shift Solenoid A/B Electrical Malfunc-
tion (Shift Solenoid Valve No. 1/No. 2)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is done in combination with ON and OFF of the shift solenoid valves No. 1 and No\
.
2 controlled by ECM. If an open or short circuit occurs in either of the \
shift solenoid valves, the ECM controls
the remaining normal shift solenoid valve to allow the vehicle to be operat\
ed smoothly (Fail safe function).
Fail Safe Function:
If either of the shift solenoid valve circuits develops an open or short, \
the ECM turns the other shift solenoid
ON and OFF to shift to the gear positions shown in the table below. The ECM also turns the shift solenoid
valve SL OFF at the same time. If both solenoids are malfunction, hydraulic contr\
ol cannot be done electroni-
cally and must be done manually.
Manual shifting as shown in the following table must be done (In the case of a short circuit, the E\
CM stops
sending current to the short circuited solenoid).
HINT:
Check the shift solenoid valve No. 1 when DTC P0753 is output and check \
the shift solenoid valve No. 2
when DTC P0758 is output.
DTC No.DTC Detecting ConditionTrouble Area
P0753
P0758
The ECM checks for an open or short circuit in the shift sole-
noid valves No. 1 and No. 2 circuit when it changes
The ECM records DTC P0753 or P0758 if condition (a) or (b) is
detected once, but it does not light up MIL
After ECM detects condition (a) or (b) continuously 8 times or
more in one− trip, it causes the MIL light up until condition (a) or
(b) disappears
After that, if the ECM detects condition (a) or (b) once, it starts
lighting up MIL again
(a) Solenoid resistance is 8 Ω or less (short circuit) when the
solenoid is energized
(b) Solenoid resistance is 100 k Ω or more (open circuit) when
the solenoid is not energized
 Open or short in shift solenoid valve No. 1/No. 2 circuit
 Shift solenoid valve No. 1/No. 2
 ECM
DI5KO−02
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Q07463
TransmissionFrom Cruise
Control ECU
W
R−YECM
1
2 B+
S1
B E4
R
S2
Shift Solenoid
Valve No. 2
B+
E4
EC2
EC2
Shift Solenoid
Valve No. 1
10
9
R
R−Y R−Y
1
2
Q07641
S2
S1
DI−158
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Measure resistance between terminal S1 or S2 of ECM and body ground.
PREPARATION:
Disconnect the connector from the ECM.
CHECK:
Measure the resistance between terminal S1 or S2 of the ECM
and body ground.
OK:
Resistance: 11 − 15 Ω
OK Check and replace ECM.
NG
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Q07312 Q07643D00082
S1
S2
S2
S1
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−159
1996 LAND CRUISER (RM451U)
2 Check harness and connector between ECM and automatic transmission sole-
noid connector.
PREPARATION:
Disconnect the solenoid connector from the automatic trans-
mission.
CHECK:
Check the harness and connector between terminals S1 or S2
of the ECM and S1 or S2 terminals of the solenoid connector.
OK:
There is no open and no short circuit.
NG Repair or replace harness or connector.
OK
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Q08224 Q08222D00083
DI−160
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
3 Check shift solenoid valve No. 1 or No. 2.
PREPARATION:
(a) Jack up the vehicle.
(b) Remove the oil pan.
(c) Disconnect the solenoid connector.
(d) Remove the shift solenoid valve No. 1 or No. 2.
CHECK:
(a) Measure the resistance between solenoid connector and
body ground.
(b) Connect positive  lead to terminal of the solenoid con-
nector, negative  lead to the solenoid body.
OK:
(a) Resistance: 11 − 15 Ω
(b) The shift solenoid valve No. 1 or No. 2 makes an
operating noise.
NG Replace shift solenoid valve No. 1 or No. 2.
OK
Repair or replace solenoid wire.
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D00076
Line
PressureDrain
Q08219
Q08226
D00087
(+)
(−)
(+)(−)
Air
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−161
1996 LAND CRUISER (RM451U)
DTC P0770 Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)
SYSTEM DESCRIPTION
The ECM uses the signals from the throttle position sensor, air −
flow meter and crankshaft position sensor to monitor the en-
gagement condition of the lock −up clutch.
Then the ECM compares the engagement condition of the
lock−up clutch with the lock −up schedule in the ECM memory
to detect mechanical trouble of the shift solenoid valve SL,
valve body and torque converter clutch.
DTC No.DTC Detecting ConditionTrouble Area
P0770
Lock− up does not occur when driving in the lock− up range
(normal driving at 80 km/h [50 mph] ), or lock− up remains ON
in the lock− up OFF range (2 trip detection logic)Shift solenoid valve SL is stuck open or closed
 Valve body blocked up or stuck
 Lock− up clutch
INSPECTION PROCEDURE
1 Check shift solenoid valve SL operation.
PREPARATION:
Remove the shift solenoid valve SL from the valve body.
CHECK:
(a) Applying 490 kPa (5 kgf/cm2, 71 psi) of compressed air,
check that the solenoid valve opens.
(b) When battery voltage is supplied to the shift solenoid
valve, check it does not leak air.
NG Replace shift solenoid valve SL.
OK
DI5KQ−02
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DI−162
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
2 Check valve body (See page DI−147 ).
NG Repair or replace valve body.
OK
Replace torque converter clutch (See page
AT −26 ).
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