1998 TOYOTA LAND CRUISER ESP
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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
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 1166 of 3115
- DIAGNOSTICSENGINE
DI-1 17
310 Author: Date:
2004 LAND CRUISER (RM1071U)
DTC P0133 Oxygen Sensor Circuit Slow Response
(Bank 1 Sensor 1)
DTC P0153 Oxygen Sensor Circuit Slow Response
(Bank 2 Sensor 1)
CIRCUIT DESCRIPTION
Refer to DTC P0031 on page DI-49.
DTC No.DTC Detecting ConditionTrouble Area
P0133
P0153
After engine has been warmed up, if response time that heated
oxygen sensor's output voltage reaches from RICH to LEAN,
or from LEAN to RICH, is 0.6 seconds or more during idling.
(2 trip detection logic)Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Heated oxygen sensor heater
EFI or ECD relay
Ai i d ti tP0153If response time of heated oxygen sensor's output voltage in
one RICH-LEAN cycle is 5.6 seconds or more during idling.
(2 trip detection logic)Air induction system
Fuel pressure
Injector
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.
DIC27-01
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 1168 of 3115
- DIAGNOSTICSENGINE
DI-1 19
312 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
RltdDTC
P0133Front heated oxygen sensor response monitor
(Bank 1)
Related DTCs
P0153Front heated oxygen sensor response monitor
(Bank 2)
Main sensors/componentsFront heated oxygen sensor
Required sensors/componentsRelated sensors/componentsCrank position sensor, Vehicle speed sensor,
Mass air flow meter
Frequency of operationOnce per drive cycle
DurationWithin 60 sec.
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)
Frequency idle condition:
There is history that the following condi-
tions were met for 20 sec.A and B
A. Vehicle speed40 km/h (25 mph)-
B. Engine speed900 rpm-
IdleON
Vehicle speed-5 km/h (3 mph)
Fuel system statusClosed loop
Time after engine start120 sec.-
Engine coolant temperature40°C (104°F)-
Frequency cruise condition:
There is history that the following condi-
tions were met for 20 sec.A and B
A. Vehicle speed40 km/h (25 mph)-
B. Engine speed900 rpm-
Intake air amount3 g/sec.13 g/sec.
Time after engine start120 sec.-
IdleOFF
Fuel system statusClosed loop
Engine speed1,000 rpm3,500 rpm
Engine coolant temperature70°C (158°F)-
Slow slope condition:
Both of the following condition were met
for 20 sec.A and B
A. Vehicle speed40 km/h (25 mph)-
B. Engine speed900 rpm-
Time after engine start120 sec.-
IdleON
Vehicle speed-5 km/h (3 mph)
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 1188 of 3115
- DIAGNOSTICSENGINE
DI-139
332 Author: Date:
2004 LAND CRUISER (RM1071U)
MONITOR STRATEGY
Heated rear oxygen sensor output voltage
(Crack) (Bank 1)
P0136Heated rear oxygen sensor output voltage
(Bank 1)
RltdDTC
Heated rear oxygen sensor slow response
(Bank 1)
Related DTCsHeated rear oxygen sensor output voltage
(Crack) (Bank 2)
P0156Heated rear oxygen sensor output voltage
(Bank 2)
Heated rear oxygen sensor slow response
(Bank 2)
Rid / tMain sensors/componentsHeated rear oxygen sensorRequired sensors/componentsRelated sensors/componentsMass air flow meter, Vehicle speed sensor
Frequency of operationOnce per drive cycle
Duration300 sec.
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)
Case 1 (Output voltage (crack)):
Vehicle speed3 km/h (2 mph)-
IdleOFF
Fuel cutOFF
Time after fuel cut ON to OFF40 sec.-
Intake air amount per revolution0.7 g/rev-
Case 2 (Output voltage):
All of the following conditions are met:A, B, C and D
A. Pass/fail detection in this driving cycleNot detected
B. EngineRunning
C. Time after engine start0 sec.-
D. Either of the following conditions is
met:(a) or (b)
(a) Cumulative time while heated oxygen
sensor heater is ON22 sec.-
(b) At once more heated oxygen sensor
voltage0.2 V-
Case 3 (Slow response):
Rear oxygen sensor voltage before the
fuel cut0.2 V or more-
Catalyst conditionWarmed up
Engine coolant temperature75°C (167°F)-