1996 TOYOTA LAND CRUISER Cruise control

DI−150
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DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
Chapter 2: On−Vehicle Repair
(  : A340F, A343F Automatic Transmission Repair Manual Pub. No. RM479U)
SymptomSuspect AreaSee page
Vehicle does not move in any forward position and reverse posi-
tion
1. Throttle cable
2. Transmission control rod
3. Manual valve
4. Primary regulator valve
5. Parking lock pawl
6. Off−vehicle repair matrix chartDI−131
DI−131


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Vehicle does not move in R position1. Off −vehicle repair matrix chart−
Vehicle does not move in a particular position or positions
(Except R position)1. Off −vehicle repair matrix chart−
No up− shift (1st → 2nd)1. 1 −2 shift valve
2. Off −vehicle repair matrix chart
−
No up −shift (2nd → 3rd)1. 2−3 shift valve
2. Off −vehicle repair matrix chart
−
No up− shift (3rd → O/D)1. 3−4 shift valve
2. Off −vehicle repair matrix chart
−
No down− shift (O/D → 3rd)1. 3−4 shift valve
No down −shift (3rd → 2nd)1. 2−3 shift valve
No down −shift (2nd → 1st)1. 1−2 shift valve
2. Off −vehicle repair matrix chart
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Lock− up does not engage or lock −up does not disengage1. Lock− up relay valve
2. Off −vehicle repair matrix chart
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Harsh engagement (N → D)1. Accumulator control valve
2. Off −vehicle repair matrix chart
−
Harsh engagement (Lock −up)1. Lock− up control valve
2. Off −vehicle repair matrix chart
−
Harsh engagement (N → R)
1. Accumulator control valve
2. C
2 accumulator
3. Off −vehicle repair matrix chart


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Harsh engagement (N → L)1. Low coast modulator valve
Harsh engagement (1st → 2nd (D position))1. Accumulator control valve
2. B
2 accumulator


Harsh engagement (1st
→ 2nd (2 position))1. Accumulator control valve
2. B
2 accumulator


Harsh engagement (2nd
→ 3rd → O/D)1. Cut− back valve
Harsh engagement (1st → 2nd → 3rd → O/D)1. Throttle valve
2. Accumulator control valve

Harsh engagement (2nd → 3rd)
3. Accumulator control valve
1. C
2 accumulator
2. Off −vehicle repair matrix chart


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Harsh engagement (3rd → O/D)
1. Accumulator control valve
2. B
0 accumulator
3. Off −vehicle repair matrix chart


−
Harsh engagement (O/D → 3rd)
1. Accumulator control valve
2. C
0 accumulator
3. Off −vehicle repair matrix chart


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DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−151
1996 LAND CRUISER (RM451U)
Slip or shudder (Forward and reverse)
1. Throttle cable
2. Transmission control rod
3. Oil strainer
4. Pressure relief valve
5. Off
−vehicle repair matrix chartDI−131
DI−131

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Slip or shudder (Particular position)
1. Throttle cable
2. Transmission control rod
3. Off −vehicle repair matrix chartDI−131
DI−131
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No engine braking (1st (L position))1. Low coast modulator
2. Off −vehicle repair matrix chart
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No engine braking (2nd (2 position))1. 2nd coast modulator
2. Off −vehicle repair matrix chart
−
No kick− down1. 1−2 shift valve
2. 2 −3 shift valve

Chapter 3: Off −Vehicle Repair
(  : A340F, A343F Automatic Transmission Repair Manual Pub. No. RM479U)
SymptomSuspect AreaSee page
Vehicle does not move in any forward position and reverse posi-
tion1. O/D one− way clutch (F0)
2. O/D planetary gear unit
3. Torque converter clutch

AT −26
Vehicle does not move in R position
1. 2nd coast brake (B1)
2. Front and rear planetary gear unit
3. Direct clutch (C
2)
4. 1st and reverse brake (B
3)




Vehicle does not move in D, 2 and L positions1. Forward clutch (C1)
Vehicle does not move in D and 2 positions1. No. 2 one− way clutch (F2)
Vehicle does not move in 2 position1. 1st and reverse brake (B3)
Vehicle does not move in L position
1. 2nd brake (B2)
2. 2nd coast brake (B
1)
3. Direct clutch (C
2)



No up− shift (1st → 2nd)1. 2nd brake (B2)
2. No. 1 one− way clutch (F
1)


No up−shift (2nd → 3rd)1. Direct clutch (C2)
No up−shift (3rd → O/D)1. O/D brake (B0)
No down−shift (2nd → 1st)1. 2nd brake (B2)
Lock−up does not engage or lock −up does not disengage1. Torque converter clutchAT −26
Harsh engagement (N → D)
1. Forward clutch (C1)
2. O/D one− way clutch (F
0)
3. No. 2 one− way clutch (F
2)



Harsh engagement (N → R)
1. Direct clutch (C2)
2. 1st and reverse brake (B
3)
3. O/D one− way clutch (F
0)



Harsh engagement (2nd → 3rd)1. Direct clutch (C2)
Harsh engagement (3rd → O/D)1. O/D brake (B0)
2. O/D planetary gear unit

Harsh engagement (O/D → 3rd)1. O/D one− way clutch (F0)
Harsh engagement (Lock −up)1. Torque converter clutchAT −26
Slip or shudder (Forward and reverse (After warm −up))
1. Torque converter clutch
2. O/D one− way clutch (F
0)
3. O/D direct clutch (C
0)
AT −26


Slip or shudder (Forward and reverse (Just after engine starts))1. Torque converter clutchAT −26
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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
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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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Q07464
Solenoid Valve SLTransmission
ECM
B+
R−L
3
EC2
Y 8
E4 SL
R−L
3
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DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−163
1996 LAND CRUISER (RM451U)
DTC P0773 Shift Solenoid E Electrical Malfunction
(Shift Solenoid Valve SL)
CIRCUIT DESCRIPTION
The shift solenoid valve SL is turned ON and OFF by signals from the ECM to control the hyd\
raulic pressure
acting on the lock−up relay valve, which then controls operation of the lock −up clutch.
Fail Safe Function:
If the ECM detects a malfunction, it turns the shift solenoid valve SL O\
FF.
DTC No.DTC Detecting ConditionTrouble Area
P0773Open or short in shift solenoid valve SL circuit for 1 time
(2 trip detection logic) Open or short in shift solenoid valve SL circuit
 Shift solenoid valve SL
 ECM
WIRING DIAGRAM
DI5KS−02
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Q07352 AT5605D00084
Rotor
No. 2 Vehicle Speed Sensor Rotor
No. 2 Vehicle Speed Sensor
AT8761
5 V/div.
0 V
2 msec./div.
DI−166
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DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
DTC P1700 Speed Sensor No. 2 Circuit Malfunction
(No. 2 Vehicle Speed Sensor)
CIRCUIT DESCRIPTION
The No. 2 vehicle speed sensor detects the rotation speed of the transmissi\
on output shaft and sends sig-
nals to the ECM. The ECM determines the vehicle speed based on these signals\
.
An AC voltage is generated in the No. 2 vehicle speed sensor coil as the r\
otor mounted on the output shaft
rotates, and this voltage is sent to the ECM.
The gear shift point and lock −up timing are controlled by the ECM based on the signals from this vehic\
le
speed sensor and the throttle position sensor signal.
If the No. 2 vehicle speed sensor malfunctions, the ECM uses input signa\
ls from the No. 1 vehicle speed
sensor as a back −up signal.
DTC No.DTC Detecting ConditionTrouble Area
P1700
All conditions below are detected 500 times or more continu-
ously (2 trip detection logic)
(a) No signal from No. 2 vehicle speed sensor is input to ECM while 4 pulses of No. 1 vehicle speed sensor signal is sent
(b) Vehicle speed: 9 km/h (5.6 mph) or more for as least 4 sec.
(c) Park/neutral position switch: OFF (Other than P or N posi-
tion)
(d) Transfer position: Other than N position
 Open or short in No. 2 vehicle speed sensor circuit
 No. 2 vehicle speed sensor
 ECM
Reference:
Waveform between terminals SP2
+ and SP2− when the vehicle
speed is approx. 60 km/h (37 mph).
DI5KW−02
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Q07467
Cruise Control ECUOD OD1B+
G−O
9 18ECM
E7
BE3840
Q07658 D00091
ON
(−) (+) OD1
DI−172
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DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
O/D Cancel Signal Circuit
CIRCUIT DESCRIPTION
While driving with cruise control activated, in order to minimize gear shifting and provide\
smooth cruising on
an uphill, overdrive may be prohibited temporarily in some conditions.
The cruise control ECU sends O/D cut signals to the ECM as necessary and\
the ECM cancels overdrive
shifting until these signals are discontinued.
(For details, see the Cruise Control section, page DI−292)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminal OD1 of ECM and body ground.
PREPARATION:
Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal OD1 of the ECM and
body ground.
OK:
Voltage: 9 − 14 V
OK Proceed to next circuit inspection shown on problem symptoms table (See page DI−147 ).
NG
DI5L0−02
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BE3840
Q07660 D00015
ON
OD
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DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−173
1996 LAND CRUISER (RM451U)
2 Check voltage between terminal OD of cruise control ECU harness side connec-
tor and body ground.
PREPARATION:
(a) Disconnect the cruise control ECU connector.
(b) Turn ignition switch ON.
CHECK:
Measure the voltage between terminal OD of the cruise control
ECU harness side connector and body ground.
OK:
Voltage: 9 − 14 V
OK Check and replace cruise control ECU.
NG
3 Check harness and connector between cruise control ECU and ECM (See pag\
e IN−28 ).
NG Repair or replace wire harness or connector.
OK
Check and replace ECM.
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