change time TOYOTA LAND CRUISER 1998 Factory Owner's Manual
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 1998, Model line: LAND CRUISER, Model: TOYOTA LAND CRUISER 1998Pages: 3115, PDF Size: 54.88 MB
Page 1099 of 3115
P20302
FI7210
A00798
Atmosphere
Housing
Platinum Electrode
Solid Electrolyte
(Zirconia Element)
Platinum Electrode
Heater
Coating (Ceramic)
Exhaust Gas CoverIdeal Air-Fuel Mixture
Output Voltage
Richer - Air Fuel Ratio - Leaner
A21040
Reference(Bank 1 Sensor 1 System Drawing) :
ECM
EFI or ECD Relay
EFI or ECD
Fuse No. 1 From
Battery
GroundOX1A
MREL HT1A
Duty
Control Heater
Sensor Heated Oxygen Sensor
EFI or ECD
Fuse No. 2
E2 DI-50
- DIAGNOSTICSENGINE
243 Author: Date:
CIRCUIT DESCRIPTION
To obtain a high purification rate for the CO, HC and NOx components of the exhaust gas, a three-way cata-
lytic converter is used, but for the most efficient use of the three-way catalytic converter, the air-fuel ratio
must be precisely controlled so that it is always close to the stoichiometric air-fuel ratio.
The heated oxygen sensor has the characteristic which its output voltage changes suddenly in the vicinity
of the stoichiometric air-fuel ratio. This characteristic is used to detect the oxygen concentration in the ex-
haust gas and provide the ECM with feedback to control the air-fuel ratio.
When the air-fuel ratio becomes LEAN, the oxygen concentration in the exhaust increases and the heated
oxygen sensor informs the ECM of the LEAN condition (low voltage, i.e. less than 0.45 V).
When the air-fuel ratio is RICHER than the stoichiometric air-fuel ratio, the oxygen concentration in the ex-
haust gas is reduced and the heated oxygen sensor informs the ECM of the RICH condition (high voltage,
i.e. more than 0.45 V). The ECM judges by the voltage output from the heated oxygen sensor whether the
air-fuel ratio is RICH or LEAN and controls the injection time accordingly. However, if malfunction of the
heated oxygen sensor causes output of abnormal voltage, this disables the ECM for performing an accurate
air-fuel ratio control. The heated oxygen sensors include a heater which heats the zirconia element. The
heater is controlled by the ECM. When the intake air volume is low (the temperature of the exhaust gas is
low) current flows to the heater to heat the sensor for accurate oxygen concentration detection.
HINT:
The ECM provides a pulse width modulated control circuit to adjust current through the heater. The heated
oxygen sensor heater circuit uses a relay on the B+ side of the circuit.
Page 1109 of 3115
DI-60
- DIAGNOSTICSENGINE
253 Author: Date:
2004 LAND CRUISER (RM1071U)
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, and other data from the time the malfunction occurred.
1 Connect OBD II scan tool or hand-held tester, and read value of mass air flow
rate.
PREPARATION:
(a) Connect the OBD II scan tool or hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the OBD II scan tool or the hand-held tester main switch ON.
(c) Start the engine.
(d) When using hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA
LIST / ALL / MAF.
CHECK:
Read the mass air flow rate on the OBD II scan tool or the hand-held tester.
RESULT:
Air Flow Rate (gm/s)Proceed to
0.0A
271.0 or moreB
Between 1 and 270.0 (*1)C
*1: The value must be changed when the throttle valve is opened or closed.
B Go to step 6.
C Check for intermittent problems
(See page DI-3).
A
Page 1132 of 3115
- DIAGNOSTICSENGINE
DI-83
276 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)
Case 1 (When temperature is fixed between 35C (95F) and 60C (140F)):
Cumulative idle off period250 sec.-
Speed increase 30 km/h (19 mph) or more10 times-
Engine coolant temperature35C (95F)60C (140F)
Intake air temperature-6.7C (20F)-
Case 2 (When temperature is fixed at 60C (140F) or more):
Engine coolant temperature at engine
start60C (140F)-
Intake air temperature-6.7C (20F)-
Stop and goOnce or more (Stop for 20 sec. or more and accelerate to more than 70 km/h (43 mph)
with in 40 sec.)
Steady driving and stop *Once or more
*: Vehicle is driven by 65 km/h (40 mph) or more for 30 sec. or more and the vehicle speed reaches 70 km/h
(44 mph). The vehicle is decelerated from 65 km/h (40 mph) to 3 km/h (2 mph) or less within 35 sec. and
stopped for 10 sec.
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Case1 (When temperature is fixed between 35C (95F) and 60C (140F)):
Change of engine coolant temperature valueLess than 3C (5.4F)
Case2 (When temperature is fixed at 60C (140F) or more):
Change of engine coolant temperature value1C (1.8F) or less
COMPONENT OPERATING RANGE
Standard Value
Engine coolant temperature changes with the actual engine coolant temperature.
INSPECTION PROCEDURE
HINT:
If DTC P0115, P0116, P0117, P0118 and P0125 are output simultaneously, ECT sensor circuit may
be open or shorted. Perform the troubleshooting of DTC P0115, P0117 or P0118 first.
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 determine 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.
Replace engine coolant temperature sensor.
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 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 1167 of 3115
A20599
0.55
0.40
Oxygen sensor output voltage (V)
Lean to Rich / Rich to Lean time definition
Time Lean to Rich time Rich to Lean time
Rich
Lean Slow slope condition
A20600
Frequency Condition
One Cycle
Rich side frequency
Lean side frequency O2 Sensor Voltage
0.45 V DI-1 18
- DIAGNOSTICSENGINE
311 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 gases. 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
waveforms of a voltage between 0 V and 1 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 0.40 V or less, the ECM judges that the air-fuel ratio is LEAN.
The ECM monitors the response feature of the heated oxygen sensor. If the response time of the heated
oxygen sensor output status change from RICH to LEAN or vice versa becomes longer, the ECM interprets
this as a malfunction in the heated oxygen sensor and sets a DTC.
Page 1169 of 3115
DI-120
- DIAGNOSTICSENGINE
313 Author: Date:
2004 LAND CRUISER (RM1071U) Fuel system status
Closed loop
Engine coolant temperature40°C (104°F)-
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Frequency idle condition
Time required by the sensor's output voltage to change in
one RICH-LEAN cycle5.6 sec. or more
Frequency cruise condition
Time required by the sensor's output voltage to change in
one RICH-LEAN cyclea specific time or more
Slow slope condition
Both of the following conditions were metA and B
A. Number of judgment made3 times
B. Following conditions were met(a) or (b)
(a) Average lean to rich response time0.9 sec. or more
(b) Average rich to lean response time0.9 sec. or more
COMPONENT OPERATING RANGE
ParameterStandard value
Voltage output from heated oxygen sensorQuickly fluctuates between 0.4 and 0.55 V
O2S TEST RESULT
Refer to page DI-3 for detailed information.
Front HO2S slow slope monitor
If the HO2S sensor voltage is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$03
(Test constant)
Low sensor voltage for response
time calculation
N/AV
$04
(Test constant)
High sensor voltage for response
time calculation
N/AV
If the time required to change is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$31Time to change from Lean (0.4
V) to Rich (0.55 V)N/Asec.
$32Time to change from Rich (0.55
V) to Lean (0.4 V)N/Asec.
Front HO2S frequency monitor (idling)
If the $38 is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$38
Response time of heated oxygen
sensor's output voltage in one
RICH-LEAN cycle
N/Asec.
Page 1187 of 3115
DI-138
- DIAGNOSTICSENGINE
331 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0136 Oxygen Sensor Circuit Malfunction (Bank 1
Sensor 2)
DTC P0156 Oxygen Sensor Circuit Malfunction (Bank 2
Sensor 2)
CIRCUIT DESCRIPTION
Refer to DTC P0031 on page DI-49.
DTC No.DTC Detecting ConditionTrouble Area
P0136
P0156
The following condition (a) or (b) continues 300 sec. or more.
(a) During driving with the engine warmed up, heated oxygen
sensor output does not change.
(b) Heated oxygen sensor output is very low most of the time.Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
HINT:
Bank 1 refers to bank that includes cylinder No. 1.
Bank 2 refers to bank that does not includes cylinder No. 1.
Sensor 2 refers to the sensor farther away from the engine assembly.
MONITOR DESCRIPTION
The ECM monitors the rear heated oxygen sensor in the following 3 items:
(1) If the rear heated oxygen sensor voltage changes between Rich and Lean while the vehicle is
running (repeating acceleration and deceleration). If not, the ECM interprets this as a malfunc-
tion, illuminates the MIL, and then sets DTC.
(2) If the rear heated oxygen sensor voltage does not remain at less than 0.05 V for a long time while
the vehicle is running. If not, the ECM interprets this as a malfunction, illuminates the MIL, and
then sets DTC.
(3) If the sensor's voltage drops to below 0.2 V (extremely Lean status) immediately when the ve-
hicle decelerates and the fuel cut is working. if not, the ECM interprets this to mean the sensor's
response feature has deteriorated, illuminates the MIL, and then sets DTC.
DIC29-01
Page 1189 of 3115
DI-140
- DIAGNOSTICSENGINE
333 Author: Date:
2004 LAND CRUISER (RM1071U) Fuel cut
Operating
Time after engine start200 sec.-
TYPICAL MALFUNCTION THRESHOLDS
Detection CriteriaThreshold
Case 1 (Output voltage (crack)):
Following conditions are met:A, B and C
A. Cumulative rear heated oxygen sensor monitor time300 sec. or more
B. Time while rear heated oxygen sensor voltage is less
than 0.05 V180 sec. or more
C. Maximum rear heated oxygen sensor rich time (0.45 V or
more)Less than 20 sec.
Case 2 (Output voltage):
Number of heated oxygen sensor voltage ºswitchingº0 time or less
ºSwitchingº is counted when the sensor signal crosses the minimum or maximum voltage
Minimum voltageLess than 0.4 V
Maximum voltage0.5 V or more
Case 3 (Slow response):
Time until the rear oxygen sensor voltage drops to 0.2 V
after fuel cut starts operating6 sec. or more
COMPONENT OPERATING RANGE
ParameterStandard Value
Heated oxygen sensor voltage0 to 1 V
O2S TEST RESULT
Refer to page DI-3 for detailed information.
Rear HO2S voltage monitor
If the HO2S sensor voltage is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$07Minimum rear HO2S voltageN/AV
$08Maximum rear HO2S voltageN/AV
If the time required to change is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$31Time to change from Lean (<0.4 V)
to Rich (0.5 V)N/Asec.
$32Time to change from Rich (0.5
V) to Lean (<0.4 V)N/Asec.
Rear HO2S slow response monitor
If the elapsed time is out of the standard value, the ECM interprets this as a malfunction.
TEST IDDescription of TEST DATAConversion FactorUnit
$37Until rear HO2S voltage drops to
0.2 V after fuel-cut startingN/Asec.
Page 1196 of 3115
- 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