2001 TOYOTA HIGHLANDER o2 sensor

G38299
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
Positive
Leak Pressure
sec NegativeONON
Sequence
TimeA
10
sec60
Within 15 minutes
sec ON
First 0.02 inch
BCD
P0455
ON: Open
OFF: Closed
OFF: Vent ON: Closed
10
Standard
sec60
E
P0456
OK
EVAP Pressure when EVAP system Leaks:
Leak PressureSecond 0.02 inch
Standard x 0.2
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-213
403 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
(a) P0455: EVAP (Evaporative Emission) gross leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP
system pressure is measured. If the stabilized system pressure is higher than [second 0.02 inch leak pres-
sure standard x 0.2] (near atmospheric pressure), the ECM determines that the EVAP system has a large
leakage, illuminates the MIL and sets the DTC (2 trip detection logic).
(b) P0456: EVAP very small leak
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP system and the EVAP
system pressure is measured. If the stabilized system pressure is higher than second 0.02 inch leak pres-
sure standard, the ECM determines that the EVAP system has a small leakage, illuminates the MIL and sets
the DTC (2 trip detection logic).
OBD II MONITOR SPECIFICATIONS
Monitor Strategy
Required Sensors/ComponentsPurge VSV and pump module
Frequency of OperationOnce per driving cycle
DurationWithin 15 minutes (varies with amount of fuel in tank)
MIL Operation2 driving cycles
Sequence of OperationNone
Typical Enabling Conditions
The monitor will run whenever these DTCs are not presentSee page 05-16
EVAP key-off monitor runs when all of the following condi-
tions met-
Atomspheric pressure525 to 825 mmHg (70 to 110 kPa)
Battery voltage10.5 V or more
Vehicle speedBelow 4 km/h (2.5 mph)
Ignition switchOFF
Engine conditionNot running
Time after engine stopped5 hours
FTP sensor malfunction (P0450, P0452, P0453)Not detected
Purge VSVNot operated by scan tool
Vent valveNot operated by scan tool

A79413
From
Speed SensorSkid
Control
ECU4-Pulse
Combination
Meter4-Pulse
ECM 05-216
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
406 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0500 VEHICLE SPEED SENSOR ºAº
DTC P0503 VEHICLE SPEED SENSOR ºAº
INTERMITTENT/ERRATIC/HIGH
CIRCUIT DESCRIPTION
The speed sensor detects the wheel speed and sends the appropriate signals to the skid control ECU. The
skid control ECU converts these wheel speed signals into a 4-pulse signal and outputs it to the ECM via
the combination meter. The ECM determines the vehicle speed based on the frequency of these pulse sig-
nals.
DTC No.DTC Detection ConditionTrouble Area
P0500
P0503
The ECM detects the following conditions simultaneously for 2
seconds (1 trip detection logic):

No SPD (speed sensor) signal is output when ECM detects
NC (transmission counter gear) signal is more than 300 rpm.

Park/Neutral position switch is OFF (when shift lever is in
other than P and N positions)
Open or short in speed sensor circuit

Speed sensor

Combination meter

ECM

Skid control ECU
MONITOR DESCRIPTION
The ECM assumes that the vehicle is being driven when the transmission counter gear indicates more than
300 rpm and over 30 seconds have passed since the park/neutral position switch was turned OFF. If there
is no signal from the vehicle speed sensor with these conditions satisfied, the ECM concludes that the ve-
hicle speed sensor is malfunctioning. The ECM will turn on the MIL and will set a DTC.
MONITOR STRATEGY
Related DTCsP0500: VSS Circuit
Required sensors/ components (Main)Vehicle speed sensor (VSS), Combination meter, ABS ECU
Required sensors / components (Related)Transmission counter gear Speed (CS) sensor, PNP switch, ECT sensor
Frequency of operationContinuous
Duration2 seconds
MIL operationImmediate
Sequence of operationNone
05EVI-05

A85370
C12
Combination Meter
13WCenter J/B
17
E65 V
SPDECM
9
3J1
3B
1
E9
E1 BR J7
J/C
A
A
BRY
IL29
Y
EE
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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407 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these DTCs are not presentSee page 05-16
Transmission counter gear speed300 rpm or more
Engine conditionRunning
Ignition switchON
Battery voltage8 V or more
StarterOFF
Either of the following conditions is met:Condition 1 and 2
Condition 1:-
Time after PNP switch turns from ON to OFF2 sec. or more
ECT and ECT sensorECT is 20C (68F) or more and ECT sensor dose not malfunction (P0115 or
P0116)
Condition 2:-
Time after PNP switch turns from ON to OFF30 sec. or more
ECT and ECT sensorECT is less than 20C (68F) or ECT sensor fail is detected (P0115 or P0116)
TYPICAL MALFUNCTION THRESHOLDS
Sensor signalNo pulse input
WIRING DIAGRAM

A67446
A62954A85537
4.5
to 5.5 V
0 V
Turn Wheel SPD (+) E1 (-)
E9
ECM
E6
ECM
05-218
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
408 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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 CHECK OPERATION OF SPEEDOMETER
(a) Drive the vehicle and check if operation of the speedometer in the combination meter is normal.
HINT:
The vehicle speed sensor is operating normally if the speedometer display is normal.
NG CHECK SPEEDOMETER CIRCUIT
(See page 05-1885)
OK
2 INSPECT ECM (SPD VOLTAGE)
(a) Shift the lever to the neutral position.
(b) Jack up the vehicle.
(c) Turn the ignition switch ON.
(d) Measure the voltage of the ECM connectors as the wheel
is turned slowly.
Standard:
Tester ConnectionSpecified Condition
E6-17 (SPD) - E9-1 (E1)Generated intermittently
HINT:
The output voltage should fluctuate up and down similarly to the
diagram on the left when the wheel is turned slowly.
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE ECM (See page 10-9)

05-588
- DIAGNOSTICSSFI SYSTEM (3MZ-FE)
778 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR STRATEGY
Related DTCsP0505: IAC Functional Check
P0505: IAC Range Check
Required sensors / components (Main)ETCS (Electrical throttle control system)
Required sensors / components (Related)CKP sensor, ECT sensor and VSS
Frequency of operationContinuous
Duration10 minutes
MIL Operation2 driving cycles
Sequence operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not presentSee page 05-377
EngineRunning
TYPICAL MALFUNCTION THRESHOLDS
Either of the following conditions is met:Condition 1 or 2
1. Frequency that both of the following conditions (a) and (b)
are met:5 times or more
(a) Engine RPM - target engine RPMLess than -100 rpm, or more than 150 rpm
(b) Vehicle conditionStop after vehicle was driven at 10 km/h (6.25 mph) or more
2. Frequency that both of the following conditions (a) and (b)
are met:Once
(a) Engine RPM - target engine RPMLess than -100 rpm, or more than 150 rpm
(b) ISC flow rate learning value1.3 L/sec or less, or 9.03 L/sec or more
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.

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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417 Author
: Date
:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR STRATEGY
Related DTCsIAC Functional Check
Required sensors / components (Main)ETCS (Electrical throttle control system)
Required sensors / components (Related)CKP sensor, ECT sensor, and VSS
Frequency of operationContinuous
Duration10 min.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not presentSee page 05-16
EngineRunning
TYPICAL MALFUNCTION THRESHOLDS
Either of the Conditions is met:Condition 1 or 2
1. Frequency that both of the following conditions (a) and (b)
are met:5 times
(a) Engine RPM - Target engine RPMLess than -100 rpm or more than 150 rpm
(b) Vehicle conditionStop after vehicle was driven at 10 km/h (6.25 mph) or more
2. Frequency that both of the following conditions (a) and (b)
are met:Once
(a) IAC flow rate learning valueBelow 1.3 L/second or above 4.51 L/second
(b) Engine RPM - Target engine RPMLess than -100 rpm or more than 150 rpm
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.

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0560 SYSTEM VOLTAGE
MONITOR DESCRIPTION
The battery supplies electricity to the ECM even when the ignition switch is OFF. This electricity allows the
ECM to store data such as DTC history, freeze frame data, fuel trim values and other data. If the battery
voltage falls below a minimum level, the ECM will conclude that there is a fault in the power supply circuit.
The next time the engine starts, the ECM will turn on the MIL and a DTC will be set.
DTC No.DTC Detection ConditionTrouble Area
P0560Open in ECM back-up power source circuit
(1 trip detection logic)
Open in back-up power source circuit

ECM
HINT:
If DTC P0560 is present, the ECM will not store other DTCs.
MONITOR STRATEGY
Related DTCsP0560: ECM system voltage
Required sensors / components (Main)ECM
Required sensors / components (Related)-
Frequency of operationContinuous
Duration3 sec.
MIL operationImmediate (MIL will illuminate after the next engine start)
Sequence operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever this DTC is not presentSee page 05-16
TYPICAL MALFUNCTION THRESHOLDS
ECM power sourceLess than 3.5 V
05EVM-05

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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DTC P0604 INTERNAL CONTROL MODULE RANDOM
ACCESS MEMORY (RAM) ERROR
DTC P0606 ECM/PCM PROCESSOR
DTC P0607 CONTROL MODULE PERFORMANCE
DTC P0657 ACTUATOR SUPPLY VOLTAGE
CIRCUIT/OPEN
MONITOR DESCRIPTION
The ECM continuously monitors its internal memory status, internal circuits, and output signals to the throttle
actuator. This self-check ensures that the ECM is functioning properly. If any malfunction is detected, the
ECM will set the appropriate DTC and illuminate the MIL.
The ECM memory status is diagnosed by internal ºmirroringº of the main CPU and the sub CPU to detect
random access memory (RAM) errors. The two CPUs also perform continuous mutual monitoring. The ECM
sets a DTC if: 1) outputs from the 2 CPUs are different and deviate from the standards, 2) the signals to the
throttle actuator deviate from the standards, 3) a malfunction is found in the throttle actuator supply voltage,
and 4) any other ECM malfunction is found.
DTC No.DTC Detection ConditionTrouble Area
P0604
P0606
P0607
P0657
ECM internal error
(1trip detection logic)ECM
MONITOR STRATEGY
Related DTCs
P0604: RAM errors
P0606: CPU malfunction
P0607: ECM range check
P0657: ETCS (Electrical throttle control) power supply circuit in ECM
Required sensors / components (Main)ECM
Required sensors / components (Related)-
Frequency of operationContinuous
DurationWithin 1 sec.
MIL operationImmediate
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these DTCs are not presentSee page 05-16
TYPICAL MALFUNCTION THRESHOLDS
RAM Error P0604:
RAMRAM check failure
CPU malfunction P0606:
Either of the following conditions is met:Condition 1 or 2
1. Difference between TP of main CPU and TP of sub CPU0.3 V or more
2. Difference between APP of main CPU and APP of sub
CPU0.3 V or more
05EVN-05