Coolant leak TOYOTA LAND CRUISER 1998 Factory Repair Manual

CH06N-05
B16653
B00809
CH-16
- CHARGINGGENERATOR
1851 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSTALLATION
1. INSTALL GENERATOR
(a) Install the generator with the bolt and 2 nuts.
Torque:
Bolt: 39 N´m (400 kgf´cm, 29 ft´lbf)
Nut 10 mm: 39 N´m (400 kgf´cm, 29 ft´lbf)
Nut 8 mm: 15.5 N´m (158 kgf´cm, 11 ft´lbf)
(b) Connect the generator connector.
(c) Connect the generator wire with the nut.
Torque: 9.8 N´m (100 kgf´cm, 87 in.´lbf)
(d) Install the terminal cap.
(e) Install the wire clamp to the cord clip on the generator.
2. INSTALL PS VANE PUMP PULLEY
(See page SR-47)
3. INSTALL RADIATOR ASSEMBLY
(See page CO-19)
4. INSTALL GENERATOR DRIVE BELT
Install the belt by turning the belt tensioner counterclockwise.
HINT:
The pulley bolt for the belt tensioner has a left - hand thread.
5. FULL ENGINE COOLANT
6. START ENGINE AND CHECK FOR LEAKS
7. RECHECK ENGINE COOLANT LEVEL
8. PERFORM ON-VEHICLE INSPECTION
(See page CH-2)
9. INSTALL ENGINE UNDER COVER NO.1

CO0IO-06
- COOLINGCOOLANT
CO-1
1762 Author
: Date
:
2004 LAND CRUISER (RM1071U)
COOLANT
INSPECTION
HINT:
Check the coolant level when the engine is cold.
1. CHECK ENGINE COOLANT LEVEL AT RADIATOR RESERVOIR
The engine coolant level should be between the ºLOWº and ºFULLº lines at normal temperature
(20°C(68°F)).
If low, check for leaks and add ºToyota Super Long Life Coolantº or similar high quality ethylene glycol based
non-silicate, non-amine, non-nitrite, and non-borate coolant with long-life hybrid organic acid technology
up to the ºFULLº line.
2. CHECK ENGINE COOLANT QUALITY
(a) Remove the radiator cap.
CAUTION:
To avoid the danger of being burned, do not remove the radiator cap while the engine and radiator
are still hot, as fluid and steam can be blown out under pressure.
(b) There should not be any excessive deposits of rust or scale around the radiator cap or radiator filler
hole, and the coolant should be free from oil.
If excessively dirty, clean the coolant passages and replace the coolant.
(c) Reinstall the radiator cap.

CO0IP-10
B04480Drain PlugDrain Plug Drain Plug
CO-2
- COOLINGCOOLANT
1763 Author
: Date
:
2004 LAND CRUISER (RM1071U)
REPLACEMENT
1. DRAIN ENGINE COOLANT
(a) Remove the radiator cap.
CAUTION:
To avoid the danger of being burned, do not remove the ra-
diator cap while the engine and radiator are still hot, as fluid
and steam can be blown out under pressure.
(b) Remove the 3 drain plugs on the engine and radiator, and
drain the coolant.
(c) Close the 3 drain plugs.
Torque: 12.7 N´m (130 kgf´cm, 9 ft´lbf) for engine
2. REFILL WITH ENGINE COOLANT
(a) Slowly fill the system with coolant.
Capacity:
w/ Front heater: 14.8 liters (15.6 US qts, 13.0 Imp. qts)
w/ Front heater and rear heater:
15.3 liters (16.2 US qts, 13.4 Imp. qts)
NOTICE:
Do not use plain water alone.
HINT:

Use of improper coolants may damage the engine cooling
system.

Use ºToyota Super Long Life Coolantº or similar high qual-
ity ethylene glycol based non-silicate, non-amine, non-
nitrite, and non-borate coolant with long-life hybrid or-
ganic acid technology.

New Toyota vehicles are filled with Toyota Super Long
Life Coolant (color is pink, premixed ethylene glycol con-
centration is approximately 50 % and freezing tempera-
ture is -35°C (-31°F)). When replacing the coolant, Toyo-
ta Super long Life Coolant is recommended.

Observe the coolant level inside the radiator by pressing
the inlet and outlet radiator hoses several times by hand.
if the coolant level goes down, add the coolant.
If the coolant level goes down, add the coolant.
(b) Install the radiator cap.
(c) Bleed the cooling system.
(1) Start the engine, and open the heater water valve.
(2) Maintain the engine speed at 2,000 - 2,500 rpm,
and warm up the engine.
(d) Stop the engine, and wait until the engine coolant cools
down.
(e) Refill coolant into the reservoir until it is ºFULLº.
3. CHECK FOR ENGINE COOLANT LEAKS
4. CHECK ENGINE COOLANT SPECIFIC GRAVITY COR-
RECTLY

CO0J2-03
B08321
B04475
B08320
- COOLINGRADIATOR
CO-19
1780 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSTALLATION
1. INSTALL SIDE SUPPORTS TO RADIATOR
(a) Install the 2 side support with 8 nuts.
Torque: 12.7 N´m (130 kgf´cm, 9 ft´lbf)
(b) Install the 2 brackets with the 4 nuts.
Torque: 20 N´m (200 kgf´cm, 13 ft´lbf)
2. INSTALL RADIATOR ASSEMBLY
(a) Place the radiator assembly to the body.
(b) Install the 2 nuts.
Torque: 20 N´m (200 kgf´cm, 15 ft´lbf)
(c) Install the radiator assembly with the 2 bolts to the body.
Torque: 18 N´m (185 kgf´cm, 13 ft´lbf)
3. INSTALL FAN PULLEY, FAN SHROUD, FAN WITH
FLUID COUPLING AND GENERATOR DRIVE BELT
(a) Place the fan with fluid coupling, fan pulley and fan shroud
in position.
(b) Temporarily install the fan pulley mounting nuts.
(c) Install the fan shroud with the 3 bolts.
Torque: 5.0 N´m (50 kgf´cm, 43 in.´lbf)
(d) Connect the A/T oil cooler hoses to the clamp on the fan
shroud.
(e) Install the generator drive belt. (See page CH-16)
(f) Tighten the 4 fan pulley mounting nuts.
(g) Install the 2 brackets on wire to the radiator wire with 2
bolts.
(h) Install the 2 clamps on the A/C discharge tube to the
brackets on the wire with the 2 nuts.
4. INSTALL RADIATOR RESERVOIR
(a) Install the grommet to the reservoir.
(b) Attach the lower side of the reservoir to the fun shuroud.
(c) install the reservoir with the 2 bolts.
(d) Connect the reservoir hose to the radiator.
(e) Install the clamp on the wire to the radiator.
5. CONNECT A/T OIL COOLER HOSES TO RADIATOR
6. CONNECT RADIATOR UPPER HOSE TO RADIATOR
7. CONNECT RADIATOR LOWER HOSE TO RADIATOR
8. FILL WITH ENGINE COOLANT
9. START ENGINE AND CHECK FOR ENGINE COOLANT
LEAKS
10. RECHECK ENGINE COOLANT LEVEL

CO0IZ-01
CO1242
Radiator Cap Tester
Radiator Cap
30° or More
B04467
Radiator Cap Tester
- COOLINGRADIATOR
CO-15
1776 Author
: Date
:
2004 LAND CRUISER (RM1071U)
ON-VEHICLE INSPECTION
1. REMOVE RADIATOR CAP
CAUTION:
To avoid the danger of being burned, do not remove the ra-
diator cap while the engine and radiator are still hot, as fluid
and steam can be blown out under pressure.
2. INSPECT RADIATOR CAP
NOTICE:

If the radiator cap has contaminations, always rinse
it with water.

Before using a radiator cap tester, wet the relief valve
and pressure valve with engine coolant or water.

When performing steps (a) and (b) below, keep the
tester at an angle of over 30° above the horizontal.
(a) Using a radiator cap tester, slowly pump the tester and
check that air is coming from the vacuum valve.
Pump speed: 1 push/(3 seconds or more)
NOTICE:
Push the pump at a constant speed.
If air is not coming from the vacuum valve, replace the radiator
cap.
(b) Pump the radiator cap tester, and measure the relief valve
opening pressure.
Pump speed: 1 push within 1 second
NOTICE:
This pump speed is for the first pump only (in order to close
the vacuum valve). After this, the pump speed can be re-
duced.
Standard opening pressure:
93 - 123 kPa (0.95 - 1.25 kgf/cm
2, 13.5 - 17.8 psi)
Minimum opening pressure:
78 kPa (0.8 kgf/cm
2, 11.4 psi)
HINT:
Use the tester's maximum reading as the opening pressure.
If the opening pressure is less than minimum, replace the radia-
tor cap.
3. INSPECT COOLING SYSTEM FOR LEAKS
(a) Fill the radiator with coolant and attach a radiator cap tes-
ter.
(b) Warm up the engine.
(c) Pump it to 118 kPa (1.2 kgf/cm
2, 17.1 psi), and check that
the pressure does not drop.
If the pressure drops, check the hoses, radiator or water pump
for leaks. If no external leaks are found, check the heater core,
cylinder block and head.
4. REINSTALL RADIATOR CAP

CO0IX-02
B04466
Jiggle Valve30°30°
- COOLINGTHERMOSTAT
CO-13
1774 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSTALLATION
1. PLACE THERMOSTAT IN WATER INLET HOUSING
(a) Install a new gasket to the thermostat.
(b) Insert the thermostat into the water inlet housing with the
jiggle valve facing straight upward.
HINT:
The jiggle valve may be set within 30° of either side of the pre-
scribed position.
2. INSTALL WATER INLET
Install the water inlet with the 3 nuts.
Torque: 19 N´m (195 kgf´cm, 14 ft´lbf)
3. FILL WITH ENGINE COOLANT
4. START ENGINE AND CHECK FOR COOLANT LEAKS
5. RECHECK ENGINE COOLANT LEVEL

CO0IS-01
B04067Air HoleWa t e r
Hole
- COOLINGWATER PUMP
CO-7
1768 Author
: Date
:
2004 LAND CRUISER (RM1071U)
INSPECTION
1. INSPECT WATER PUMP
(a) Visually check the air hole and water hole for coolant leak-
age.
If leakage is found, replace the water pump and timing belt.
(b) Turn the pulley, and check that the water pump bearing
moves smoothly and quietly.
If necessary, replace the water pump.
2. INSPECT TIMING BELT COMPONENTS
(See page EM-20)

B04460
AB
- COOLINGWATER PUMP
CO-9
1770 Author
: Date
:
2004 LAND CRUISER (RM1071U)
(f) Install the water inlet and housing assembly with the 2
bolts. Alternately tighten the bolts.
Torque: 18 N´m (185 kgf´cm, 13 ft´lbf)
HINT:
Each bolt length is indicated in the illustration.
Bolt length:
76 mm (3.00 in.) for A
22 mm (0.87 in.) for B
3. INSTALL NO.2 IDLER PULLEY (See page EM-22)
4. INSTALL TIMING BELT (See page EM-22)
5. FILL WITH ENGINE COOLANT
6. START ENGINE AND CHECK FOR ENGINE COOLANT
LEAKS
7. RECHECK ENGINE COOLANT LEVEL

- DIAGNOSTICSENGINE
DI-129
322 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0134 Oxygen Sensor Circuit No Activity Detected
(Bank 1 Sensor 1)
DTC P0154 Oxygen Sensor Circuit No Activity Detected
(Bank 2 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0031 on page DI-49.
DTC No.DTC Detecting ConditionTrouble Area
P0134
P0154
After the engine is warmed up, heated oxygen sensor (bank 1,
sensor 1) output does not indicate RICH (more than 0.45 V)
even once when the following conditions continue for 65 sec.
or more:
(a) Engine speed: 1,400 rpm or more
(b) Vehicle speed: 25 to 81 mph (40 to 130 km/h) or more
(c) Throttle valve does not fully closed
(d) 180 sec. or more after starting engine
(e) Engine coolant temperature more than 40°C (104°F)

Open or short in heated oxygen sensor circuit

Heated oxygen sensor

Heated oxygen sensor heater

EFI or ECD relay

Air induction system

Fuel pressure

PCV hose connection

PCV valve and hose

Injector

Gas leakage on exhaust system

PCV piping

ECM
HINT:

Bank 1 refers to bank that includes cylinder No. 1.

Bank 2 refers to bank that does not includes cylinder No. 1.

Sensor 1 refers to the sensor closer to the engine assembly.

After confirming DTC P0134 and P0154, check the output voltage of the heated oxygen sensor in the
"DIAGNOSIS / ENHANCE OBD II / DATA LIST / ALL" using the OBD II scan tool or the hand-held tester.
If output voltage of the heated oxygen sensor is always less than 0.1 V, heated oxygen sensor circuit
may be open or short.
MONITOR DESCRIPTION
The ECM uses the heated oxygen sensor to optimize the air-fuel mixture in closed-loop fuel control. This
control helps decrease exhaust emissions by providing the catalyst with a nearly stoichiometric mixture.
The sensor detects the oxygen level in the exhaust gas and the ECM uses this data to control the air-fuel
ratio. The sensor output voltage ranges from 0 V to 1 V. If the signal voltage is less than 0.4 V, the air-fuel
ratio is LEAN. If the signal voltage is more than 0.55 V, the air-fuel ratio is RICH. If the conditions for the
closed-loop fuel control are met and after a specified time-period, the sensor's output signal never indicates
RICH, the ECM will conclude that the closed-loop fuel control is malfunctioning. The ECM will illuminate the
MIL and a DTC is set.
DIC28-01

- DIAGNOSTICSENGINE
DI-147
340 Author
: Date
:
2004 LAND CRUISER (RM1071U)
DTC P0171 System too Lean (Bank 1)
DTC P0172 System too Rich (Bank 1)
DTC P0174 System too Lean (Bank 2)
DTC P0175 System too Rich (Bank 2)
CIRCUIT DESCRIPTION
The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim in-
cludes the short-term fuel trim and the long-term fuel trim.
The short-term fuel trim is the short-term fuel compensation used to maintain the air-fuel ratio at stoichio-
metric air-fuel ratio. The signal from the heated oxygen sensor indicates whether the air-fuel ratio is RICH
or LEAN compared to the stoichiometric air-fuel ratio. This variance triggers a reduction in the fuel volume
if the air-fuel ratio is RICH, and an increase in the fuel volume if it is LEAN.
The long-term fuel trim is the overall fuel compensation carried out in long-term to compensate for a continu-
al deviation of the short-term fuel trim from the central value, due to individual engine differences, wear over-
time and changes in the operating environment.
If both the short-term fuel trim and the long-term fuel trim are LEAN or RICH beyond a certain value, it is
detected as a malfunction and the MIL is illuminated and a DTC is set.
DTC No.DTC Detecting ConditionTrouble Area
P0171
P0174When air-fuel ratio feedback is stable after warming up engine,
fuel trim is considerably in error on LEAN side
(2 trip detection logic)
Air induction system
Injector blockage
Mass air flow meter
Engine coolant temperature sensor
Fuel pressure
Gas leakage in exhaust system
Open or short in heated oxygen sensor (bank 1, 2 sensor 1)
circuit
Heated oxygen sensor (bank 1, 2 sensor 1)
Heated oxygen sensor heater (bank 1, 2 sensor 1)
EFI or ECD relay
PCV piping
ECM
P0172
P0175When air-fuel ratio feedback is stable after warming up engine,
fuel trim is considerably in error on RICH side
(2 trip detection logic)
Injector leak, blockage
Mass air flow meter
Engine coolant temperature sensor
Ignition system
Fuel pressure
Gas leakage in exhaust system
Open or short in heated oxygen sensor (bank 1, 2 sensor 1)
circuit
Heated oxygen sensor (bank 1, 2 sensor 1)
ECM
DIC2A-01