1996 TOYOTA LAND CRUISER Land cruiser 150

A00154
ON
Intake Air
Temp. Sensor ECM
5V
E2 E1
3
4 3
9
E5
E5
BE6653
FI7055 A00154 THA
A00150
ON
Intake Air
Temp. Sensor ECM
5V
3
9 E2
E1
THA E2
THA
E5
E5
BE6653
FI7057
P24655
DI−28
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
2 Check for open in harness or ECM.
PREPARATION:
(a) Disconnect the mass air flow meter connector.
(b) Connect sensor wire harness terminals together.
(c) Turn ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA hand −
held tester.
OK:
Temp. value: 140° C (284°F) or more
OK Confirm good connection at sensor. If OK, replace mass air flow meter.
NG
3 Check for open in harness or ECM.
PREPARATION:
(a) Remove instrument panel speaker No.1 panel (See page SF−65 ).
(b) Connect between terminals THA and E2 of ECM connec-
tor.
HINT:
Mass air flow meter connector is disconnected.
Before checking, do a visual and contact pressure check for the
ECM connector (See page IN−28).
(c) Turn ignition switch ON.
CHECK:
Read temp. value on the OBD II scan tool or TOYOTA
hand −held tester.
OK:
Temp. value: 140° C (284°F) or more
OK Open in harness between terminals E2 or THA, repair or replace harness.
NG
Confirm good connection at ECM.
If OK, replace ECM (See page IN−28).
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DI−80
−
DIAGNOSTICS ENGINE
1996 LAND CRUISER (RM451U)
DTC P0402 Exhaust Gas Recirculation Flow Excessive Detected
CIRCUIT DESCRIPTION
Refer to DTC P0401 (Exhaust Gas Recirculation Flow Insufficient Detected) on page DI−69.
DTC No.DTC Detecting ConditionTrouble Area
P0402
EGR gas temp. sensor value is high during EGR cut −off when
engine is cold (Race engine at about 4,000 rpm without load so
that vacuum is applied to port E)
(2 trip detection logic) EGR valve stuck open
 EGR VSV open malfunction
 Open in VSV circuit for EGR
 Short in EGR gas temp. sensor circuit
 ECM
EGR valve is always open (2 trip detection logic)
Refer to DTC P0401 (Exhaust Gas Recirculation Flow Insufficient Detected) for the System Check Driving
Pattern and Wiring Diagram.
INSPECTION PROCEDURE
TOYOTA hand −held tester
1 Connect the TOYOTA hand −held tester and read EGR gas temp. value.
PREPARATION:
(a) Remove the fuse cover on the instrument panel.
(b) Connect the TOYOTA hand−held tester to the DLC3.
(c) Turn ignition switch ON and push the TOYOTA hand −held tester main switch ON.
CHECK:
Read EGR gas temp. on the TOYOTA hand−held tester.
OK:
EGR gas temp.: 150° C (302°F) or less (Not immediately after driving)
HINT:
If there is a short circuit, the TOYOTA hand−held tester indicates Approx. 157.5°C (315.5°F).
OK Go to step 4.
NG
DI5PL−02
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A15825
−
DIAGNOSTICS ENGINE
DI−103
1996 LAND CRUISER (RM451U)
DTC P1500 Starter Signal Circuit Malfunction
CIRCUIT DESCRIPTION
When the engine is cranked, the intake air flow is slow, so fuel vaporization is poor. A rich mixture is therefore
necessary in order to achieve good startability. While the engine is being cranked, the battery positive volt-
age is applied to terminal STA of the ECM. The starter signal is mainly used to increase the fuel inj\
ection
volume for the starting injection control and after −start injection control.
WIRING DIAGRAM
DI968−01
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DI−140
−
DIAGNOSTICS AUTOMATIC TRANSMISSION
1996 LAND CRUISER (RM451U)
(6) Shift into the D position. Press all the way down on the accelerator pedal wi\
th your right foot.
Quickly read the stall speed at this time.
Stall speed: 1,950 ± 150 rpm
(7) Do the same test in R position.
Stall speed: 1,950 ± 150 rpm
Evaluation:
ProblemPossible cause
Stall speed low in D and R positions
 Engine output may be insuf ficient
 Stator one− way clutch is operating properly
HINT:
If more than 600 rpm below the specified value, the torque con-
verter clutch could be faulty.
Stall speed high in D position
 Line pressure too low
 Forward clutch slipping
 No. 2 one− way clutch not operating properly
 O/D one− way clutch not operating properly
Stall speed high in R position
Line pressure too low
 Direct clutch slipping
 1st and reverse brake slipping
 O/D clutch slipping
Stall speed high in D and R positions
Line pressure too low
 Improper fluid level
 O/D one− way clutch not operating properly
(b) Measure the time lag.
When the shift lever is shifted while the engine is idling, there will be a certain time lapse o\
r lag before
the shock can be felt. This is used for checking the condition of the O/D d\
irect clutch, forward clutch,
direct clutch and 1st and reverse brake.
NOTICE:
Do the test at normal operating ATF temperature 50 − 80°C (122 − 176° F).
Be sure to allow 1 minute interval between tests.
Take 3 measurements and take the average value.
(1) Fully apply the parking brake.
(2) Start the engine and check idle speed.
Idle speed: 650 ± 50 rpm (In N position and air conditioner OFF)
(3) Shift the shift lever from N to D position. Using a stop watch, measure the ti\
me it takes from shift-
ing the lever until the shock is felt.
In the same manner, measure the time lag for N → R.
Time lag: N → D Less than 1.2 seconds
In the same way, measure the time lag for N → R.
Time lag: N → R Less than 1.5 seconds
If N → D time or N → R time lag is longer than specified:
Evaluation:
ProblemPossible cause
N → D time lag is longer
Line pressure too low
 Forward clutch worn
 O/D one− way clutch not operating properly
N → R time lag is longer
Line pressure too low
 Direct clutch worn
 1st and reverse brake worn
 O/D one− way clutch not operating properly
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−
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI−141
1996 LAND CRUISER (RM451U)
8. HYDRAULIC TEST
Measure the line pressure.
NOTICE:
Do the test at normal operation ATF temperature 50 − 80°C (122 − 176° F).
The line pressure test should always be carried out in pairs. One techni\
cian should observe
the conditions of wheels or wheel stoppers outside the vehicle while the ot\
her is doing the test.
Be careful to prevent SST’s hose from interfering with the exhaust pipe.
(1) Warm up the ATF.
(2) Remove the test plug on the transmission case right side and connect SST\
(See page AT−18
for the location to connect SST).
SST 09992 −00094 (09992 −00150, 09992−00270)
(3) Fully apply the parking brake and chock the 4 wheels.
(4) Start the engine and check idling speed.
(5) Keep your left foot pressed firmly on the brake pedal and shift into D p\
osition.
(6) Measure the line pressure when the engine is idling.
(7) Press the accelerator pedal all the way down. Quickly read the highest line pr\
essure when engine
speed reaches stall speed.
NOTICE:
Release the accelerator pedal and stop test if the rear wheels begin to rotate before the engine speed
reaches the specified stall speed.
(8) In the same manner, do the test in R position.
Specified line pressure:
Condition D position kPa (kgf/cm2, psi) R position kPa (kgf/cm2, psi)
Idling422 −
481 (4.3 − 4.9, 61 − 70)510 − 608 (5.2 − 6.2, 74 − 88)
Stall1,285 − 1,530 (13.1 − 15.6, 128 − 153)1,579 − 1,932 (16.1 − 19.7, 158 − 193)
If the measured pressures are not up to specified values, recheck the thro\
ttle cable adjustment and retest.
Evaluation:
ProblemPossible cause
If the measured value at all positions are higher
Throttle cable out of adjustment
 Throttle valve defective
 Regulator valve defective
If the measured value at all positions are lower
Throttle cable out of adjustment
 Throttle valve defective
 Regulator valve defective
 Oil pump defective
 O/D direct clutch defective
If pressure is low in the D position onlyD position circuit fluid leakage
 Forward clutch defective
If pressure is low in the R position only
R position circuit fluid leakage
 Direct clutch defective
 1st and reverse brake defective
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DI−150
−
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


−
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
−
Lock− up does not engage or lock −up does not disengage1. Lock− up relay valve
2. Off −vehicle repair matrix chart
−
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


−
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


−
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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BE3840
Q07359D00023
ON
-
DIAGNOSTICS AUTOMATIC TRANSMISSION
DI-186
1996 LAND CRUISER (RM451U)
INSPECTION PROCEDURE
1 Check operation of 2nd start switch.
CHECK:
(a) Turn the ignition switch ON.
(b) Check º2nd STRTº indicator light when 2nd start switch is
pushed in to ON.
OK:
º2nd STRTº indicator light lights up.
CHECK:
Check º2nd STRTº indicator light when 2nd start switch is
pushed again, or PWR mode switch is pushed into OFF.
OK:
º2nd STRTº indicator light goes off. When PWR mode
switch is pushed in to ON, º2nd STRTº indicator light
goes off, and ºPWRº indicator light lights up.
OK Proceed to next circuit inspection shown on matrix chart (See page DI-150).
NG
2 Check 2nd start indicator bulb.
NG Replace 2nd start indicator bulb.
OK
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EM−50
−
ENGINE MECHANICAL CYLINDER HEAD
1996 LAND CRUISER (RM451U)
2. REPLACE SPARK PLUG TUBE GASKETS
(a) Using a screwdriver, pry out the tube gasket.
(b) Using SST and a hammer, tap in a new tube gasket as
shown in the illustration.
SST 09950 −60010 (09951 −00480), 09950 −70010
(09951 −07150)
(c) Apply a light coat of MP grease to the gasket lip.
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