TOYOTA HIGHLANDER 2001 Service Repair Manual

12
34
A76787
A81695A86849
Wire Harness Side
A6
A/F Sensor
HT
+B
E8
ECM
HA1A
AF+AF-
A1A-A1A+
A90346
A/F Sensor
EFI Relay
Heater
Sensor
A1A+ HA1A
Duty
Control ECM
From
Battery
A1A-
MREL Reference
+B
AF-AF+ HT
EFI NO. 1
FuseEFI NO. 2
Fuse
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK WIRE HARNESS (A/F SENSOR - ECM)
(a) Check the wire harness between the ECM and A/F sen-
sor.
(1) Disconnect the A6 A/F sensor connector.
(2) Disconnect the E8 ECM connector.
(3) Measure the resistance of the wire harness side
connectors.
Standard:
Tester ConnectionSpecified Condition
A6-3 (AF+) - E8-23 (A1A+)
A6-4 (AF-) - E8-31 (A1A-)
A6-1 (HT) - E8-5 (HA1A)
Below 1 W
A6-3 (AF+) or A1A+ (E8-23) - Body ground
A6-4 (AF-) or A1A- (E8-31) - Body ground
A6-1 (HT) or HA1A (E8-5) - Body ground
10 kW or higher
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE ECM (See page 10-9)

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- DIAGNOSTICSSFI SYSTEM (2AZ-FE)(From August, 2004)
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DTC P2401 EVAPORATIVE EMISSION SYSTEM LEAK
DETECTION PUMP CONTROL CIRCUIT LOW
DTC P2402 EVAPORATIVE EMISSION SYSTEM LEAK
DETECTION PUMP CONTROL CIRCUIT
HIGH
CIRCUIT DESCRIPTION
Refer to EVAP Inspection Procedure (see page 05-317).
DTCsMonitoring ItemDetection ConditionTrouble AreaDetection
TimingDetection
Period
P2401Vacuum pump stuck OFF
(built-in pump module)
To determine leak criterion (Reference
pressure), vacuum pump creates negative
pressure in canister pump module through
0.02 inch orifice and pressure is measured.
If one of following conditions is met, ECM
setspumpmodule related DTCs: P043E

Pump module

Connector / wire harness
Ignition2 trips
P2402Vacuum pump stuck ON
(built-in pump module)
sets pump module related DTCs: P043E,
P043F, P2401, P2402 and P2419:

Reference pressure is -1 kPa or higher

Reference pressure is -4.85 kPa or lower

Reference pressure is not saturated within
60 secondsConnector / wire harness
(Pump module - ECM)

ECM
Ignition
OFF2 trips
WIRING DIAGRAM
Refer to EVAP Inspection Procedure (see page 05-317).
INSPECTION PROCEDURE
Refer to EVAP Inspection Procedure (see page 05-317).
05PGP-01

A96746
Fuel Tank Canister
Vacuum Pump: OFF Pressure Sensor 0.02 Inch Orifice
Pump Module
Operation A: Atmospheric Pressure Measurement
Vent Valve: OFF (vent)
Operation D: Purge VSV monitor Operation B, E: 0.02 Inch Leak Pressure Measurement
Negative
Pressure Atmospheric
Pressure Air Filter
Purge VSV: OFFOFF (vent)
ON
OFF
OFF
ON
ON (closed)ON
ON
ON (closed)
Operation C: EVAP System Pressure Measurement
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)(From August, 2004)
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MONITOR DESCRIPTION
5 hours* after the ignition switch is turned OFF, the electric vacuum pump creates negative pressure (vacu-
um) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions
based on the EVAP pressure.
HINT:
*: If the engine coolant temperature is not below 35C (95F) 5 hours after the ignition switch is turned off,
the monitor check starts 2 hours later. If it is still not below 35C (95F) 7 hours after the ignition switch is
turned off, the monitor check starts 2.5 hours later.
SequenceOperationsDescriptionsDuration
-ECM activationActivated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch turned to OFF.-
AAtmospheric pressure
measurement
Vent valve turned OFF (vent) and EVAP system pressure measured by ECM in order to
register atmospheric pressure.
If EVAP pressure is not between 70 kPa and 110 kPa (525 mmHg and 825 mmHg), ECM
cancels EVAP system monitor.
10 seconds
B
First 0.02 inch leak
pressure measure-
mentIn order to determine 0.02 inch leak pressure standard, vacuum pump creates negative pres-
sure (vacuum) through 0.02 inch orifice and them ECM checks if vacuum pump and vent
valve operate normally.
60 seconds
CEVAP system pres-
sure measurement
Vent valve turned ON (closed) to shut EVAP system.
Negative pressure (vacuum) created in EVAP system, and EVAP system pressure then
measured.
Write down the measured value as it will be used in the leak check.
If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor.
15 minutes*
DPurge VSV monitorPurge VSV opened and then EVAP system pressure measured by ECM.
Large increase indicates normal.10 seconds
E
Second 0.02 inch leak
pressure measure-
mentLeak check is performed after second 0.02 inch leak pressure standard is measured.
If stabilized system pressure higher than second 0.02 inch leak pressure standard, ECM
determines that EVAP system leaking.
60 seconds
FFinal checkAtmospheric pressure measured and then monitoring result recorded by ECM.-
* If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.

A85217
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
secOFF
Sequence
TimeA
10
sec60
Within 15 minutes
sec ON
Specified
RangeBCD
EVAP Pressure during EVAP Monitor
OK
Malfunction
ON: Open
OFF: Closed
OFF: Vent ON: Closed
10
sec60
E Malfunction
OFF
OFF
ON OFF
OK
Malfunction
Malfunction
-1 kPa
-4.85 kPa
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- DIAGNOSTICSSFI SYSTEM (2AZ-FE)(From August, 2004)
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In sequence B and E, to determine the leak criterion, the vacuum pump creates negative pressure in the
canister pump module through the 0.02 inch orifice. If the pressure is out of specified range or is not satu-
rated, the ECM illuminates the MIL and sets DTCs P043E, P043F, P2401, P2402 and P2419 (2-trip detec-
tion logic).

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)(From August, 2004)
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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 are 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 is stopped5 hours
FTP sensor malfunction (P0450, P0452, P0453)Not detected
Purge VSVNot operated by scan tool
Vent valveNot operated by scan tool
Leak detection pumpNot operated by scan tool
Both of the following conditions are met before IG switch
OFF:Condition 1 and 2
1. Duration that vehicle is driven5 min. or more
2. Purge flowExecuted
ECT4.4 to 35C (40 to 95F)
IAT4.4 to 35C (40 to 95F)
Example of re-start time
First time7 hours
Second time9 hours and 30 min.
Key-of f monitor sequence: 1 to 8
1. Atmospheric pressure
Next sequence is run if following condition met-
Atmospheric pressure change for 10 sec.Within 2.25 mmHg (0.3 kPa) for 1 sec.
2. First reference pressure
Next sequence is run if all of following conditions metCondition 1, 2 and 3
1. FTP when 4 sec. after reference pressure measurement-7.5 mmHg (-1 kPa) or less
2. Reference pressure-36.47 to -7.93 mmHg (-4.85 to -1.057 kPa)
3. Reference pressureSaturated
3. Vent valve stuck closed check
Next sequence is run if following condition met-
FTP change for 10 sec. after vent valve ON (closed)2.25 mmHg (0.3 kPa) or more
4. Vacuum introduction and leak
Next sequence is run if both of following conditions metCondition 1 and 2
1. Vacuum introduction timeWithin 15 min.
2. FTPFTP was saturated
5. Purge VSV stuck closed check
Next sequence is run if following condition met-
FTP change for 10 sec. after purge VSV ON (open)2.25 mmHg (0.3 kPa) or more

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- DIAGNOSTICSSFI SYSTEM (2AZ-FE)(From August, 2004)
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6. Second reference pressure measurement
Next sequence is run if all of following conditions metCondition 1, 2, 3 and 4
1. FTP when 4 sec. after reference pressure measurement-7.5 mmHg (-1 kPa) or less
2. Reference pressure-36.47 to -7.93 mmHg (-4.85 to -1.057 kPa)
3. Reference pressureSaturated
4. Reference pressure difference between first and secondLess than 5.25 mmHg (0.7 kPa)
7. Leak check
Next sequence is run if following condition met-
FTP when vacuum introduction was completeLower than second reference pressure
8. Atmospheric pressure
Monitor is complete if following-
Atmospheric pressure difference between sequence 1 and 8Within 2.25 mmHg (0.3 kPa)
Typical Malfunction Thresholds
One of the following conditions is met:Condition 1, 2, 3, 4 or 5
1. FTP when 4 seconds after reference pressure measure-
ment beganMore than -7.5 mmHg (-1 kPa)
2. Reference pressureLess than -36.4 mmHg (-4.85 kPa)
3. Reference pressure-7.9 mmHg (-1.057 kPa) or more
4. Reference pressureNot saturated
5. Reference pressure difference between first and second5.2 mmHg (0.7 kPa) or more
MONITOR RESULT (MODE 06)
Refer to page 05-317 for detailed information on Monitor Result.

- DIAGNOSTICSSFI SYSTEM (2AZ-FE)(From August, 2004)
05-293
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05-294
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)(From August, 2004)
484 Author
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DTC P2419 EVAPORATIVE EMISSION SYSTEM
SWITCHING VALVE CONTROL CIRCUIT
LOW
DTC P2420 EVAPORATIVE EMISSION SYSTEM
SWITCHING VALVE CONTROL CIRCUIT
HIGH
CIRCUIT DESCRIPTION
Refer to the EVAP Inspection Procedure (see page 05-317).
DTCsMonitoring ItemsDetection ConditionsTrouble AreasDetection
TimingsDetection
Logic
P2419
Vent valve stuck ON /
Closed (built-in pump mod-
ule)
To determine leak criterion (Reference
pressure), vacuum pump creates negative
pressure in canister pump module through
0.02 inch orifice and pressure is measured.
If one of following conditions is met, ECM
sets pump module related DTCs: P043E,
P043F, P2401, P2402 and P2419:

Reference pressure is -1 kPa or higher

Reference pressure is -4.85 kPa or lower

Reference pressure is not saturated within
60 seconds

Pump module

Connector/Wire harness
(Pump module - ECM)

ECM
Ignition
OFF2 trips
P2420Vent valve stuck OFF / Vent
(built-in pump module)
To determine leak criterion, vacuum pump
creates negative pressure in canister pump
module through 0.02 inch orifice. After that,
ECM turns vent valve ON (Vent) and mea-
sures pressure. If it does not change, ECM
sets DTC P2420.
WIRING DIAGRAM
Refer to the EVAP Inspection Procedure (see page 05-317).
INSPECTION PROCEDURE
Refer to the EVAP Inspection Procedure (see page 05-317).
05IRD-03

A96746
Fuel Tank Canister
Vacuum Pump: OFF Pressure Sensor 0.02 Inch Orifice
Pump Module
Operation A: Atmospheric Pressure Measurement
Vent Valve: OFF (vent)
Operation D: Purge VSV monitor Operation B, E: 0.02 Inch Leak Pressure Measurement
Negative
Pressure Atmospheric
Pressure Air Filter
Purge VSV: OFFOFF (vent)
ON
OFF
OFF
ON
ON (closed)ON
ON
ON (closed)
Operation C: EVAP System Pressure Measurement
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)(From August, 2004)
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MONITOR DESCRIPTION
5 hours* after the ignition switch is turned OFF, the electric vacuum pump creates negative pressure (vacu-
um) in the EVAP (Evaporative Emission) system. The ECM monitors for leaks and actuator malfunctions
based on the EVAP pressure.
HINT:
*: If the engine coolant temperature is not below 35C (95F) 5 hours after the ignition switch is turned off,
the monitor check starts 2 hours later. If it is still not below 35C (95F) 7 hours after the ignition switch is
turned off, the monitor check starts 2.5 hours later.
SequenceOperationsDescriptionsDuration
-ECM activationActivated by soak timer, 5 hours (7 or 9.5 hours) after ignition switch turned to OFF.-
AAtmospheric pressure
measurement
Vent valve turned OFF (vent) and EVAP system pressure measured by ECM in order to
register atmospheric pressure.
If EVAP pressure is not between 70 kPa and 110 kPa (525 mmHg and 825 mmHg), ECM
cancels EVAP system monitor.
10 seconds
B
First 0.02 inch leak
pressure measure-
mentIn order to determine 0.02 inch leak pressure standard, vacuum pump creates negative pres-
sure (vacuum) through 0.02 inch orifice and them ECM checks if vacuum pump and vent
valve operate normally.
60 seconds
CEVAP system pres-
sure measurement
Vent valve turned ON (closed) to shut EVAP system.
Negative pressure (vacuum) created in EVAP system, and EVAP system pressure then
measured.
Write down the measured value as it will be used in the leak check.
If EVAP pressure does not stabilize within 15 minutes, ECM cancels EVAP system monitor.
15 minutes*
DPurge VSV monitorPurge VSV opened and then EVAP system pressure measured by ECM.
Large increase indicates normal.10 seconds
E
Second 0.02 inch leak
pressure measure-
mentLeak check is performed after second 0.02 inch leak pressure standard is measured.
If stabilized system pressure higher than second 0.02 inch leak pressure standard, ECM
determines that EVAP system leaking.
60 seconds
FFinal checkAtmospheric pressure measured and then monitoring result recorded by ECM.-
* If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.

A85217
Purge VSV
Vent Valve
Vacuum Pump
EVAP Pressure
secOFF
Sequence
TimeA
10
sec60
Within 15 minutes
sec ON
Specified
RangeBCD
EVAP Pressure during EVAP Monitor
OK
Malfunction
ON: Open
OFF: Closed
OFF: Vent ON: Closed
10
sec60
E Malfunction
OFF
OFF
ON OFF
OK
Malfunction
Malfunction
-1 kPa
-4.85 kPa
05-296
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)(From August, 2004)
486 Author
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(a) P2419: Vent valve stuck ON (Closed)
In sequence B and E, to determine the leak criterion, the vacuum pump creates negative pressure in
the canister pump module through the 0.02 inch orifice. If the pressure is out of specified range or is
not saturated, the ECM illuminates the MIL and sets DTCs P043E, P043F, P2401, P2402 and P2419
(2-trip detection logic).