1996 TOYOTA LAND CRUISER light

−
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−149
1996 LAND CRUISER (RM451U)
Harsh engagement (N
→ D)
1. Shift solenoid valve SL circuit
2. ATF temp. sensor circuit
3. Throttle position sensor circuit
4. Park/neutral position switch circuit
5. On −vehicle repair matrix chart
6. Off −vehicle repair matrix chart
7. ECMDI−163
DI−154 DI−35
DI−169 −
−
DI−145
Harsh engagement (Lock −up)
1. Shift solenoid valve SL circuit
2. Throttle position sensor circuit
3. No. 1 vehicle speed sensor circuit
4. No. 2 vehicle speed sensor circuit
5. On −vehicle repair matrix chart
6. Off −vehicle repair matrix chart
7. ECMDI−163 DI−35
DI−87
DI−166 −
−
DI−145
Harsh engagement (Any driving position)
1. Shift solenoid valve SL circuit
2. ATF temp. sensor circuit
3. Throttle position sensor circuit
4. No. 1 vehicle speed sensor circuit
5. No. 2 vehicle speed sensor circuit
6. On −vehicle repair matrix chart
7. Off −vehicle repair matrix chart
8. ECMDI−163
DI−154 DI−35
DI−87
DI−166
−
−
DI−145
Slip or shudder (Forward and reverse)1. On −vehicle repair matrix chart
2. Off −vehicle repair matrix chart−
−
Slip or shudder (A particular position)1. On −vehicle repair matrix chart
2. Off −vehicle repair matrix chart−
−
No engine braking1. On −vehicle repair matrix chart
2. Off −vehicle repair matrix chart−
−
Poor acceleration
1. Throttle position sensor circuit
2. No. 1 vehicle speed sensor circuit
3. No. 2 vehicle speed sensor circuit
4. Shift solenoid valve No. 1 and No. 2 circuit
5. Shift solenoid valve SL circuit
6. On −vehicle repair matrix chart
7. Off −vehicle repair matrix chartDI−35
DI−87
DI−166
DI−157
DI−163 −
−
No kick− down
1. Throttle position sensor circuit
2. Shift solenoid valve No. 1 and No. 2 circuit
3. No. 1 vehicle speed sensor circuit
4. On−vehicle repair matrix chart
5. ECMDI−35
DI−157 DI−87 −
DI−145
No pattern select1. Pattern select switch circuit
2. ECMDI−179
DI−145
No 2nd start
1. Pattern select switch circuit
2. Shift solenoid valve No. 1 and No. 2 circuit
3. ECMDI−179
DI−157
DI−145
Large shift shock or engine stalls when starting off or stopping
1. Shift solenoid valve SL circuit
2. Stop light switch circuit
3. Off −vehicle repair matrix chart
4. ECMDI−163
DI−185 −
DI−145
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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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BE3840
Q08479D00090
ON
(−)
(+)
NSWR
2
L
Position
P, NR
D
2
L NSW
−
Body ground R −

Body ground 2 −

Body ground L −

Body ground
Below 1.5 V
7.5 − 14 V
7.5 −
14 V*
7.5 − 14 V
Below 1.5 V
Below 1.5 V
Below 1.5 V Below1.5 V
Below 1.5 V
Below 1.5 V Below1.5 V
Below 1.5 V
9 − 14 V
Below 1.5 V
Below 1.5 V
Below 1.5 V
9 −
14 V
9 − 14 V
9 − 14 V Below 1.5 V
DI−170
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Read PNP, REVERSE, 2ND and LOW signals.
When using TOYOTA hand −held tester:
PREPARATION:
(a) Remove the fuse box cover.
(b) Connect a TOYOTA hand−held tester to the DLC3.
(c) Turn the ignition switch ON and TOYOTA hand−held tes-
ter main switch ON.
CHECK:
Shift lever into the P, R, N, 2 and L positions, and read the PNP,
REVERSE, 2 and L signals on the TOYOTA hand −held tester.
OK:
Shift positionSignal
22ND OFF → ON
LLOW OFF → ON
RREVERSE OFF → ON
P, NPNP SW OFF → ON
When not using TOYOTA hand −held tester:
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals NSW, 2 and L of ECM
and body ground when the shift lever is shifted to the following
positions.
OK:
*: The voltage will drop slightly due to lighting up of the back up
light.
OK Check and replace ECM.
NG
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Q08582
ECM
O/D OFF Indicator Light
(Combination Meter)
Ignition Switch
Fuse BlockO/D Main Switch* E7
2
P−L
B−L Y
GAUGE
Battery B+
W
2
Y
3 2
4 4
2
2 2
4
W−B
6
FL AM1
B−Y
22
E6 A
A
EA2 C12
C12
19
OD2
B ID2
J1
B 9
1
1 8
3
Fuse Block
P−L
P−L
AM1
2
BF
R/B No. 2 R/B No. 2
O/D Main switch
Contact go off with switch pushed in.
Contact go on with switch once again.
*:
DI−174
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
O/D Main Switch & O/D OFF Indicator Light Circuit
CIRCUIT DESCRIPTION
The O/D main switch contacts go off when the switch is pushed in and come on when it is pushed once again.\
In O/D main switch OFF position, the O/D OFF indicator lights up, and the \
ECM prohibits shifting to O/D.
WIRING DIAGRAM
DI5L3−03
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D00077 BE3840D00092
ON
ON
OFF
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−175
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
O/D OFF indicator light does not light up:
1 Check operation of O/D main switch.
CHECK:
(a) Turn the ignition switch ON.
(b) Check the O/D OFF indicator light when the O/D main
switch is pushed in to ON.
OK:
O/D OFF indicator light goes off
CHECK:
Check the O/D OFF indicator light when the O/D main switch is
pushed again to OFF.
OK:
O/D OFF indicator light lights up
NG Go to step 4.
OK
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BE3840
Q08230D00093
ON
OD2
DI−176
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
2 Check OVRDRIVE CUT SW2 signal.
When using TOYOTA hand −held tester:
PREPARATION:
(a) Remove the fuse box cover.
(b) Connect a TOYOTA hand−held tester to the DLC3.
(c) Turn the ignition switch ON and TOYOTA hand−held tes-
ter main switch ON.
CHECK:
Read the OVRDRIVE CUT SW2 signal on the TOYOTA hand −
held tester.
OK:
O/D Main SwitchOVRDRIVE CUT SW2 Signal
O/D ON (pushed in)OFF
O/D OFF (pushed out)ON
When not using TOYOTA hand −held tester:
PREPARATION:
Turn the ignition switch ON.
CHECK:
Check the voltage between terminal OD2 of the ECM and body
ground.
OK:
O/D Main SwitchVoltage
O/D ON9 − 14 V
O/D OFFBelow 3 V
OK Proceed to next circuit inspection shown on
problem symptoms table (See page DI−147 ).
NG
3 Check harness and connector between O/D OFF indicator light and ECM (Se\
e page IN−28 ).
NG Repair or replace harness or connector.
OK
Check and replace ECM.
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Q08233
Q08233
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−177
1996 LAND CRUISER (RM451U)
4 Check O/D main switch.
CHECK:
(a) Disconnect the O/D main switch connector.
(b) Measure the resistance between terminals 2 and 4 of the
O/D main switch connector.
OK:
O/D Main SwitchResistance
ON∞ Ω〈 open)
OFF0 Ω (continuity)
NG Replace O/D main switch.
OK
Check and replace the combination meter
(See page BE−32 ).
O/D OFF indicator light remains ON:
1 Check O/D main switch.
CHECK:
(a) Disconnect the O/D main switch connector.
(b) Measure the resistance between terminals 2 and 4 of the
O/D main switch connector.
OK:
O/D Main SwitchResistance
ON∞ Ω〈 open)
OFF0 Ω (continuity)
NG Replace O/D main switch.
OK
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DI−178
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
2 Check harness and connector between O/D OFF indicator light and O/D main
switch, and O/D OFF indicator light and ECM (See page IN−28).
NG Repair or replace harness or connector.
OK
Check and replace ECM.
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