TOYOTA LAND CRUISER 1998 Factory Repair Manual
Manufacturer: TOYOTA, Model Year: 1998, Model line: LAND CRUISER, Model: TOYOTA LAND CRUISER 1998Pages: 3115, PDF Size: 54.88 MB
Page 1151 of 3115
A20488A21045
Threshold
(75C (167F))Estimated ECT
5 sec.
Indicated coolant temp. reading
DTC set (after 2 driving cycle) ECT
Time DI-102
- DIAGNOSTICSENGINE
295 Author: Date:
DTC P0128 Coolant Thermostat (Coolant Temperature
Below Thermostat Regulating Temperature)
HINT:
This is the purpose of ºthermostatº malfunction detection.
CIRCUIT DESCRIPTION
If the engine coolant temperature does not reach 75°C (167°F) despite sufficient warm-up time has
elapsed.
DTC No.DTC Detection conditionTrouble Area
P0128
Condition (a), (b) and (c) are met:
(a) Cold start
(b) After sufficient warm-up time has elapsed
(c) Engine coolant temperature greater than 75°C (167°F)Thermostat
Cooling system
Engine coolant temperature sensor
ECM
MONITOR DESCRIPTION
The ECM estimates the coolant temperature based on starting temperature, engine loads, and engine
speeds. The ECM then compares the estimated temperature with the actual ECT (Engine Coolant Tempera-
ture). When the estimated coolant temperature reaches 75C (167F), the ECM checks the actual ECT. If
the actual ECT is less than 75C (167F), the ECM will interpret this as a fault in the thermostat or engine
cooling system and set a DTC.
DIC25-01
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DI-103
296 Author: Date:
MONITOR STRATEGY
Related DTCsP0128Thermostat
Rid / t
Main sensors/componentsEngine coolant temperature sensor, Engine
cooling system, Thermostat
Required sensors/components
Related sensors/componentsIntake air temperature sensor, Vehicle speed
sensor
Frequency of operationOnce per drive cycle
Duration15 min.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
Battery voltage11.0 V-
Intake air temperature (at engine start)-10C (14F)35C (95F)
Engine coolant temperature
(at engine start)-10C (14F)35C (95F)
Difference between intake air temperature
and engine coolant temperature (at engine
start)
-15C (-27F)7C (12.6F)
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Duration period of both A and B5 sec. or more
A Estimated engine coolant temperature75C (167F) or more
B Engine coolant temperature sensor output valueLess than 75C (167F)
MONITOR RESULT
The detailed information is described in CHECKING MONITOR STATUSº (see page DI-3).
TID (Test Identification) is assigned to each emission-related component.
TLT (Test Limit Type):
If TLT is 0, the component is malfunctioning when the test value is higher than the test limit.
If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
CID (Component Identification) is assigned to each test value.
Unit Conversion is used to calculate the test value indicated on generic OBD scan tools.
TID $08: Thermostat
TLTCIDUnit ConversionDescription of Test ValueDescription of Test Limit
1$01Multiply by 0.625 and sub-
tract 40 (C)ECT sensor output when estimated ECT reaches malfunction criteri-
onMalfunction criterion
Page 1153 of 3115
DI-104
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INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the
engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help deter-
mine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean
or rich, as well as other data from the time when a malfunction occurred.
1 Are there any other codes (besides DTC P0128) being output?
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester or OBD II scan tool main switch ON.
(c) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand-held tester or the OBD II scan tool.
RESULT:
Display (DTC Output)Proceed to
P0128A
P0128 and other DTCsB
HINT:
If any other codes besides P0128 are output, perform the troubleshooting for those DTCs first.
B Go to relevant DTC chart (See page DI-36).
A
2 Check cooling system.
CHECK:
Check that there is a defect in the cooling system which causes over-cool, such as abnormal radiator fan
operation, modified cooling system and so on.
NG Repair or replace cooling system.
OK
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DI-105
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3 Check thermostat (See page CO-12).
NG Replace thermostat.
OK
Replace ECM (See page SF-60).
Page 1155 of 3115
DI-106
- DIAGNOSTICSENGINE
299 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0130 Oxygen Sensor Circuit (Bank 1 Sensor 1)
DTC P0150 Oxygen Sensor Circuit (Bank 2 Sensor 1)
DTC P2195 Oxygen Sensor Signal Stack Lean (Bank 1
Sensor 1)
DTC P2196 Oxygen Sensor Signal Stack Rich (Bank 1
Sensor 1)
DTC P2197 Oxygen Sensor Signal Stack Lean (Bank 2
Sensor 1)
DTC P2198 Oxygen Sensor Signal Stack Rich (Bank 2
Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0031 on page DI-49.
DTC No.Detection ItemTrouble Area
P0130
P0150
Output voltage of heated oxygen sensor remains at 0.4 V or
more, or 0.55 V or less, during idling after engine is warmed
up
(2 trip detection logic)
Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
P2195
P2197Output voltage of heated oxygen sensor remains at 0.55 V
or less, during idling after engine is warmed up
(2 trip detection logic)
Heated oxygen sensor heater
EFI or ECD relay
Air induction system
Fuel pressure
P2196
P2198Output voltage of heated oxygen sensor remains at 0.4 V or
more, during idling after engine is warmed up
(2 trip detection logic)
Fuel ressure
Injector
ECM
HINT:
Bank 1 refers to bank that includes cylinder No. 1.
Bank 2 refers to bank that does not includes cylinder No. 2.
Sensor 1 refers to the sensor closer to the engine assembly.
The heated oxygen sensor's output voltage and the short-term fuel trim value can be read using the
OBD II scan tool or hand-held tester.
DIC26-01
Page 1156 of 3115
A20806
Rich
Lean 0.55
0.45
0.40
Oxygen sensor output voltage (V)
PASS
FAILFAIL
FAIL
Pass / Fail definition of voltage malfunction
Time
- DIAGNOSTICSENGINE
DI-107
300 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR DESCRIPTION
The ECM uses the heated oxygen sensor information to regulate the air-fuel ratio close to a stoichiometric
ratio. This maximizes the catalytic converter's ability to purify the exhaust gas. The sensor detects oxygen
levels in the exhaust gas and sends this signal to the ECM.
The inner surface of the sensor element is exposed to outside air. The outer surface of the sensor element
is exposed to exhaust gas. The sensor element is made of platinum coated zirconia and includes an inte-
grated heating element. The heated oxygen sensor has the characteristic whereby its output voltage
changes suddenly in the vicinity of the stoichiometric air-fuel ratio. The heated oxygen sensor generates
output voltage between 0 V and 1.0 V in response to the oxygen concentration in exhaust gas. When the
output voltage of the heated oxygen sensor is 0.55 V or more, the ECM judges that the air-fuel ratio is RICH.
When it is 0.4 V or less, the ECM judges that the air-fuel ratio is LEAN.
Under normal condition, the output voltage from the heated oxygen sensor alternates RICH and LEAN sides
periodically. If the heated oxygen sensor outputs RICH signal (or LEAN signal) constantly, or if the heated
oxygen sensor cannot output enough voltage to reach the minimum specification, the ECM interprets this
as a malfunction in the heated oxygen sensor and sets a DTC.
MONITOR STRATEGY
P0130Front heated oxygen sensor voltage is constant
at lean side or rich side (Bank 1)
P0150Front heated oxygen sensor voltage is constant
at lean side or rich side (Bank 2)
P2195Front heated oxygen sensor voltage is constant
at lean side (Bank 1)
Related DTCs
P2196Front heated oxygen sensor voltage is constant
at rich side (Bank 1)
P2197Front heated oxygen sensor voltage is constant
at lean side (Bank 2)
P2198Front heated oxygen sensor voltage is constant
at rich side (Bank 2)
Rid / tMain sensors/componentsFront heated oxygen senorRequired sensors/componentsRelated sensors/componentsCrank position sensor, Vehicle speed sensor
Frequency of operationOnce per drive cycle
Duration20 to 36 sec. x (3 times)
MIL operation2 driving cycles
Sequence of operationNone
Page 1157 of 3115
DI-108
- DIAGNOSTICSENGINE
301 Author: Date:
2004 LAND CRUISER (RM1071U)
TYPICAL ENABLING CONDITIONS
ItSpecificationItemMinimumMaximum
The monitor will run whenever the follow-
ing DTCs are not presentSee ºList of disable a monitorº (on page DI-3)
There is history that the following condi-
tions A and B were met:20 sec. (Continuously)-
A. Vehicle speed40 km/h (25 mph)-
B. Engine speed900 rpm-
Time after engine start120 sec.-
IdleON
Fuel system statusClosed loop
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
P0130, P0150:
Either of the following conditions A or B is met:3 times or more
A. Front oxygen sensor voltage is 0.55 V or lessFor 18 sec. or more
B. Front oxygen sensor voltage is 0.4 V or moreFor 18 sec. or more
P2195, P2197:
Front heated oxygen sensor voltageConstant 0.55 V or less
P2196, P2198:
Front heated oxygen sensor voltageConstant 0.4 V or more
COMPONENT OPERATING RANGE
ParameterStandard value
In the normal condition, the heated oxygen sensor voltage0 to 1 V
O2S TEST RESULT
Refer to page DI-3 for detailed information.
Front HO2S voltage monitor
If the HO2S voltage is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$07Minimum front HO2S voltageN/AV
$08Maximum front HO2S voltageN/AV
WIRING DIAGRAM
Refer to DTC P0031 on page DI-49.
Page 1158 of 3115
A20314
Vehicle speed
40 km/h
(25 mph)
Ignition OFF
(a) (b)120 sec.
or more(d)
20 sec.
or more 20 sec.
or more20 sec.
or more20 sec.
or more
20 sec.
or more30 sec. (e)
(f) Idling (c)(d)
(d)
(e)
- DIAGNOSTICSENGINE
DI-109
302 Author: Date:
2004 LAND CRUISER (RM1071U)
CONFIRMATION DRIVING PATTERN
(a) Connect the hand-held tester to the DLC3.
(b) Switch the hand-held tester from the ºnormal modeº to the ºcheck modeº (See page
DI-3).
(c) Start the engine and let the engine idle for 120 seconds or more.
(d) Drive the vehicle at 25 mph (40 km/h) or more for 20 seconds or more.
(e) Let the engine idle for 20 seconds or more. Perform steps (d) and (e) at 3 times.
(f) Let the engine idle for 30 seconds.
HINT:
If a malfunction exists, the MIL will light up during step (f).
NOTICE:
If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.
If you do not have a hand-held tester, turn the ignition switch OFF after performing steps (c) to (f),
then perform steps (c) to (f) again.
INSPECTION PROCEDURE
HINT:
Hand-held tester only:
The narrowing down the trouble area is possible by performing ACTIVE TEST of the following ºA/F CON-
TROLº (Heated oxygen sensor or another can be distinguished).
(a) Perform ACTIVE TEST by hand-held tester (A/F CONTROL).
HINT:
ºA/F CONTROLº is an ACTIVE TEST which changes the injection volume to -12.5 % or +25 %.
(1) Connect the hand-held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine with the engine speed at 2,500 rpm for approximately 90 seconds.
(4) Select the item ºDIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROLº.
(5) Perform ºA/F CONTROLº with the engine in an idle condition (press the right or left button).
RESULT:
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume
+25% " rich output: More than 0.5 V
-12.5% " lean output: Less than 0.4 V
Page 1159 of 3115
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Case 1
Case 2
Case 3
Case 4
Output voltage of heated oxygen
sensor (sensor 1: front sensor)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2: rear sensor)Mainly suspect
trouble area
OK
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Injection volume
Output voltage
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Injection volume
Output voltage
Sensor 1: front sensor
(sensor 1, heater, sensor 1
circuit)
+25 %
-12.5 %
More than 0.5 V
Less than 0.4 V
Injection volume
Output voltage
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NGExtremely rich or lean of the
actual air-fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
Almost no reaction
Almost no reaction
'
Sensor 2: rear sensor
(sensor 2, heater, sensor 2
circuit)
Almost no reaction Almost no reaction
DI-1 10
- DIAGNOSTICSENGINE
303 Author: Date:
2004 LAND CRUISER (RM1071U)
NOTICE:
However, there is a few seconds delay in the sensor 1 (front sensor) output. And there is about 20
seconds delay in the sensor 2 (rear sensor).
The following A/F CONTROL procedure enables the technician to check and graph the voltage output of
the heated oxygen sensors (sensor 1 and 2).
For displaying the graph indication, enter ºACTIVE TEST / A/F CONTROL / USER DATAº then select ºO2S
B1S1 and O2S B1S2º by pressing ºYESº button and push ºENTERº button before pressing ºF4º button.
NOTICE:
If the vehicle is short of fuel, the air-fuel ratio becomes LEAN and heated oxygen sensor DTCs will
be recorded, and the MIL then comes on.
HINT:
If different DTCs related to different systems that have terminal E2 as the ground terminal are output
simultaneously, terminal E2 may be open.
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records
the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determin-
ing whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio
was lean or rich, etc. at the time of the malfunction.
A high heated oxygen sensor (sensor 1) voltage (0.5 V or more) could be caused by a rich air fuel mix-
ture. Check for conditions that would cause the engine to run rich.
A low heated oxygen sensor (sensor 1) voltage (0.4 V or less) could be caused by a lean air fuel mix-
ture. Check for conditions that would cause the engine to run lean.
Page 1160 of 3115
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DI-1 11
304 Author: Date:
2004 LAND CRUISER (RM1071U)
1 Are there any other codes (besides DTC P0130, P0150, P2195, P2197, P2196 or
P2198) being output?
PREPARATION:
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Turn the ignition switch ON and push the hand-held tester or OBD II scan tool main switch ON.
(c) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand-held tester or the OBD II scan tool.
RESULT:
Display (DTC Output)Proceed to
ºP0130, P0150, P2195, P2196, P2197 and/or P2198ºA
ºP0130, P0150 P2195, P2196, P2197 or P2198º and other DTCsB
HINT:
If any other codes besides ºP0130, P0150, P2195, P2196, P2197 and/or P2198º are output, perform the
troubleshooting for those DTCs first.
B Go to relevant DTC chart (See page DI-36).
A