2001 TOYOTA HIGHLANDER Service Repair Manual

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TOYOTA HIGHLANDER 2001 Service Repair Manual A82385
ECTEstimated ECT
Threshold
(75C (167F))5 seconds
Indicated coolant temperature reading
Time
DTC set (after 2 driving cycles)
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-1 15
305 Author: Date:
2005

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TOYOTA HIGHLANDER 2001 Service Repair Manual 05-1 16
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
306 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR STRATEGY
Related DTCsP0128: Coolant thermostat
Required sensors/components (Main)Thermost

05-1 16
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
306 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR STRATEGY
Related DTCsP0128: Coolant thermostat
Required sensors/components (Main)Thermostat
Required sensors/components (Related)ECT sensor, IAT sensor, VSS
Frequency of operationOnce per driving cycle
Duration500 sec.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not presentSee page 05-16
Battery voltage11 V or more
Throttle position learningCompleted
Either of the following conditions is met:Condition 1 or 2
1. All of the following conditions are met:Condition (a), (b) and (c)
(a) ECT at engine start - IAT at engine start-15 to 7C (-27 to 12.6F)
(b) ECT at engine start-10 to 56C (14 to 132.8F)
(c) IAT at engine start-10 to 56C (14 to 132.8F)
2. All of the following conditions are met:Condition (a), (b) and (c)
(a) ECT at engine start - IAT at engine startMore than 7C (12.6F)
(b) ECT at engine start56C (132.8F) or less
(c) IAT at engine start-10C (14F) or more
Accumulated time that vehicle speed is 80 mph (128 km/h)
or moreLess than 20 seconds
TYPICAL MALFUNCTION THRESHOLDS
Duration that both of the following conditions 1 and 2 are
met:5 seconds or more
1. Estimated ECT120.5C (248.9F) or more
2. ECT sensor outputLess than 120.5C (248.9F)
MONITOR RESULT
Refer to page 05-24 for detailed information.
The test value and test limit information are described as shown in the following table. Check the monitor
result and test values after performing the monitor drive pattern (see page 05-26).
TID (Test Identification Data) is assigned to each emissions-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 Data) is assigned to each test value.
Unit Conversion is used to calculate the test value indicated on generic OBD ll scan tools.
TID $08: Thermostat
TLTCIDUnit ConversionDescription of Test DataDescription of Test Limit
1$01
Multiply by 0.625 and subtract
40
(C)ECT sensor output when estimated ECT
has reached to malfunction criterionMalfunction criteria for thermostat

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TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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307 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand-held tester or the OBD II scan t

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TOYOTA HIGHLANDER 2001 Service Repair Manual A90870
Atmosphere
Housing
Platinum Electrode
Solid Electrolyte
(Zirconia Element)
Platinum Electrode
Heater
Coating (Ceramic)
Exhaust Gas CoverIdeal Air-fuel Mixture
Output Voltage
Richer - Air Fuel R

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TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-1 19
309 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)DTC No.
DTC Detection ConditionTrouble Area
Following condition (a) (b) or (c) is met:
(a) During

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-1 19
309 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)DTC No.
DTC Detection ConditionTrouble Area
Following condition (a) (b) or (c) is met:
(a) During driving with engine warmed up, heated oxygen sen-
sor output does not change for 8 minutes
(b) Heated oxygen sensor output is very low most of time for
Open or short in heated oxygen sensor (bank 1 sensor 2)
ii
P0136
(b) Heated oxygen sensor out ut is very low most of time for
220 seconds
(c) The rear heated oxygen sensor voltage does not drop to
below 0.2 V immediately when vehicle decelerates and fuel
cut is operatingcircuit
Heated oxygen sensor (bank 1 sensor 2)
Heated oxygen sensor heater (bank 1 sensor 2)
A/F sensor

A/F sensor heatercut is o erating
Both (a) and (b) continue for more than 30 seconds:
(a) Estimated rear oxygen sensor temperature is less than
800C
(b) Rear oxygen sensor impedance is less than 5WA/F sensor heater
EFI relay
P0137
Both (a) and (b) continue for more than 240 seconds:
(a) Estimated rear oxygen sensor temperature is more than
450C
(b) Rear oxygen sensor impedance is more than 15kWOpen or short in heated oxygen sensor (bank 1 sensor 2)
circuit (sensor to ECM)
Open or short in heated oxygen sensor (bank 1 sensor 2)
internal
P0138Rear oxygen sensor output voltage is over 1.2 V for more than
30 secondsShort in heated oxygen sensor (bank 1 sensor 2) circuit
Short in heated oxygen sensor (bank 1 sensor 2) circuit
ECM internal circuit malfunction
MONITOR DESCRIPTION
The ECM monitors the rear heated oxygen sensor (HO2S) in the following 4 items:
1. The HO2S voltage changes between Rich (more than 0.45 V) and Lean (less than 0.45 V) while the vehicle
is running (repeating acceleration and deceleration) for 8 minutes. If not, the ECM interprets this as a mal-
function, illuminates the MIL, and then sets a DTC.
2. The HO2S voltage does not remain at less than 0.05 V for a long time while the vehicle is running (60 %
of the time in the 220 second-monitor, the sensor output is less than 0.05 V). If it does, the ECM interprets
this as a malfunction, illuminates the MIL, and then sets a DTC.
3. The sensor's voltage drops to below 0.2 V (extremely Lean status) immediately when the vehicle deceler-
ates and the fuel cut is working for 7 seconds. If not, the ECM interprets this to mean the sensor's response
feature has deteriorated, illuminates the MIL, and then sets a DTC.
4. The rear oxygen sensor impedance is 5 W or less, 15 kW or more, or output voltage is 1.2 V or more (normal
voltage: 0 to 1.0 V). If so, the ECM will determine that the rear oxygen sensor or a related circuit has an open
or short circuit, illuminates the MIL and sets a DTC.
Impedance is detected by the IC inside the ECM.
MONITOR STRATEGY
Related DTCs
P0136: Heated oxygen sensor output voltage (Output voltage)
P0136: Heated oxygen sensor impedance (Low impedance)
P0137: Heated oxygen sensor impedance (High impedance)
P0138: Heated oxygen sensor output voltage (High voltage)
P0138: Heated oxygen sensor output voltage (During fuel-cut)
Required Sensors/Components (Main)Heated oxygen sensor
Required Sensors/Components (Related)Crankshaft position sensor, engine coolant temperature sensor, mass air flow me-
ter and throttle position sensor
Frequency of OperationOnce per driving cycle: Active air-fuel ratio control detection
Continuous: Others
DurationWithin 480 seconds
MIL Operation
2 driving cycles: P0136 (Rear HO2S output voltage - case 1)
P0136 (Rear HO2S output voltage - case 2)
P0138 (Rear HO2S voltage during fuel-cut)
Immediate: Others
Sequence of OperationNone

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TOYOTA HIGHLANDER 2001 Service Repair Manual 05-120
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
310 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
All:
The monitor will run whenever these DTCs are not presentSee page

05-120
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
310 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
All:
The monitor will run whenever these DTCs are not presentSee page 05-16
P0136 (Rear HO2S output voltage - case 1):
All of the following conditions are met:Conditions 1, 2, 3 and 4
1. Malfunction determination in this driving cycleNot detected
2. EngineRunning
3. Time after engine start0 second or more
4. Either of the following conditions is met:Conditions (a) or (b)
(a) Cumulative time while HO2S heater is operating22 seconds or more
(b) HO2S voltageHas reached to 0.2 V or more
P0136 (Rear HO2S output voltage - case 2):
EngineRunning
P0136 (Rear HO2S low impedance):
Battery voltage11 V or more
Estimated HO2S temperatureLess than 700C (1,292F)
ECM monitorCompleted
P0606Not set
P0137 (Rear HO2S high impedance):
Battery voltage11 V or more
Estimated HO2S temperature450C (842F) or higher
ECM monitorCompleted
P0606Not set
P0138 (Rear HO2S output voltage - case 3):
Battery voltage11 V or more
Time after engine start2 seconds or more
P0138 (Rear HO2S output voltage during fuel-cut):
Engine coolant temperature70C (158F) or more
Catalyst temperature400C (752F) or more
Fuel-cutExecuting
TYPICAL MALFUNCTION THRESHOLDS
P0136 (Rear HO2S output voltage - case 1):
Both of the following conditions are met:Conditions 1 and 2
1. Frequency that HO2S voltage changes between (a) and
(b)0 time
(a) Maximum voltage0.6 V or more
(b) Minimum voltageLess than 0.45 V
2. Cumulative monitor time *1
of rear HO2S320 seconds or more
*1: Monitor time is counted when all of the following condi-
tions are met:Conditions (a) and (b)
(a) Fuel system statusClosed-loop
(b) IdleOFF
P0136 (Rear HO2S output voltage - case 2):
All of the following conditions are met:Conditions 1, 2, 3, 4 and 5
1. Cumulative monitor time *2
of HO2S220 seconds or more
2. Duration while HO2S voltage is below 0.05 V132 seconds or more
3. Duration while HO2S voltage is higher than 0.7 VLess than 44 seconds
4. Duration while HO2S voltage is 0.45 V to 0.7 VLess than 88 seconds
5. Duration while HO2S voltage is 0.45 V or moreLess than 20 seconds

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TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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311 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U) *2: Monitor time is counted when all of the following condi-
tions are met:
Conditions 1, 2, 3 and

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TOYOTA HIGHLANDER 2001 Service Repair Manual 05-122
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
312 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
O2S TEST RESULT
Refer to page 05-22 for detailed information.
HO2S Output voltage (Minimum and Max

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