fuel pressure TOYOTA HIGHLANDER 2001 Service Service Manual
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 2001, Model line: HIGHLANDER, Model: TOYOTA HIGHLANDER 2001Pages: 2572, PDF Size: 34.8 MB
Page 1721 of 2572
A90871
Crankshaft Position Sensor
(36-2 teeth or 12 teeth)ECM
Camshaft Position Sensor
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-147
337 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)DTC No.
DTC Detection ConditionTrouble Area
P0300Misfiring of random cylinders is detected
Open or short in engine wire
Connector connection
Vacuum hose connection
Ignition system
Injector
Fuel pressure
MAF meter
ECT sensor
Compression pressure
Valve clearance
Valve timing
PCV hose connection
PCV hose
ECM
P0301
P0302
Misfiring of each cylinder is detectedSame as DTC No P0300P0302
P0303
P0304Misfiring of each cylinder is detectedSame as DTC No. P0300
HINT:
When several codes for a misfiring cylinder are recorded repeatedly but no random misfire code is recorded,
the misfires have been detected and recorded at different times.
MONITOR DESCRIPTION
The ECM illuminates the MIL (2 trip detection logic) if:
The misfiring rate exceeds a threshold value and could cause emission deterioration.
During the first 1,000 engine revolutions after the engine starts, an excessive misfire rate (approxi-
mately 20 to 50 misfires per 1,000 engine revolutions) occurs 1 time.
After the first 1,000 engine revolutions after the engine starts, an excessive misfire rate (approximately
20 to 50 misfires per 1,000 engine revolutions) occurs 4 times.
The ECM blinks the MIL (MIL blinks immediately) if:
Within 200 engine revolutions at a high rpm, the threshold for ºpercentage of misfire causing catalyst
damageº is reached 1 time.
Within 200 engine revolutions at a normal rpm, the threshold for ºpercentage of misfire causing catalyst
damageº is reached 3 times. (for the 2nd trip, reaching the threshold once will cause the MIL to flash)
Page 1731 of 2572
1234
5678
A85366
A61075A90538
Wire Harness Side
I8
I9
I10
I11
Injector
I15
Ignition Switch
IG2
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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(c) Check the wire harness between the injector and ignition
switch.
(1) Disconnect the I8, I9, I10 and I11 injector connec-
tors.
(2) Disconnect the I15 ignition switch connector.
(3) Measure the resistance of the wire harness side
connectors.
Standard:
Tester ConnectionSpecified Condition
I8-2 - I15-6 (IG2)
I9-2 - I15-6 (IG2)
I10-2 - I15-6 (IG2)
I11-2 - I15-6 (IG2)
Below 1 W
I8-2 or I15-6 (IG2) - Body ground
I9-2 or I15-6 (IG2) - Body ground
I10-2 or I15-6 (IG2) - Body ground
I11-2 or I15-6 (IG2) - Body ground
10 kW or higher
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
11 INSPECT FUEL INJECTOR INJECTION AND VOLUME OF MISFIRING CYLINDER
(See page 11-7)
Standard:
Injection VolumeDifference Between Each Injector
76 to 91 cm3 (4.6 to 5.5 cu in.) / 15 seconds15 cm3 (0.9 cu in.) or less
NG REPLACE FUEL INJECTOR ASSY
OK
12 CHECK CYLINDER COMPRESSION PRESSURE OF MISFIRING CYLINDER
(See page 14-1)
Standard:
ItemSpecified Condition
Compression pressure1.360 MPa (13.9 kgf/cm2, 198 psi)
Minimum pressure0.98 MPa (10 kgf/cm2, 142 psi)
Difference between each cylinder0.1 MPa (1.0 kgf/cm2, 14 psi)
NG REPAIR OR REPLACE
OK
Page 1732 of 2572
05-158
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348 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
13 CHECK VALVE CLEARANCE OF MISFIRING CYLINDER (See page 14-6)
Standard (cold):
ItemSpecified Condition
Intake0.19 to 0.29 mm (0.0075 to 0.0114 in.)
Exhaust0.30 to 0.40 mm (0.0118 to 0.0157 in.)
NG ADJUST VALVE CLEARANCE
(See page 14-6)
OK
14 SWITCH STEP BY NUMBER OF MISFIRE CYLINDER (REFER TO RESULTS OF
STEP 4)
HINT:
If the result of step 4 is º1 or 2 cylindersº, proceed to A.
If the result of step 4 is ºmore than 3 cylindersº, proceed to B.
B CHECK FOR INTERMITTENT PROBLEMS
(See page 05-9)
A
15 CHECK VALVE TIMING (See page 14-68)
(a) Check for loose or jumped tooth of the timing chain.
OK: The matchmarks of the crankshaft pulley and camshaft pulley are alined.
NG ADJUST VALVE TIMING (See page 14-68)
OK
16 CHECK FUEL PRESSURE (See page 11-4)
Standard:
ItemSpecified Condition
Fuel pressure304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to 55 psi)
NG CHECK AND REPLACE FUEL PUMP,
PRESSURE REGULATOR, FUEL PIPE LINE AND
FILTER
OK
Page 1763 of 2572
+25 %
-12.5 %
More than 3.35 V
Less than 3.0 V
Case 1
Case 2
Case 3
Case 4
Output voltage of A/F sensor
(sensor 1)
Injection volume
Output voltage
Output voltage of heated oxygen
sensor (sensor 2)Main suspect
trouble area
OK
+25 %
-12.5 %
More than 3.35 V
Less than 3.0V
Injection volume
Output voltage
+25 %
-12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
A/F sensor
(A/F sensor, heater, A/F sen-
sor circuit)
+25 %
-12.5 %
More than 0.55 V
Less than 0.4V
Injection volume
Output voltage
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NG
+25 %
-12.5 %
Injection volume
Output voltage
NGExtremely rich or lean actual
air-fuel ratio
(Injector, fuel pressure, gas
leakage in exhaust system,
etc.) OK
OK
OK
Almost
No reaction
Almost
No reaction
Almost
No reaction Almost
No reaction
'
Heated oxygen sensor
(heated oxygen sensor,
heater, heated oxygen sensor
circuit)
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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NOTICE:
The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about
20 seconds of delay at maximum.
The following of A/F CONTROL procedure enables a technician to check and graph the voltage outputs of
both the heated oxygen sensors.
For displaying the graph, enter ºACTIVE TEST / A/F CONTROL / USER DATAº, select ºAFS B1S1 and O2S
B1S2º by pressing ºYESº and push ºENTERº. Then press ºF4º.
Page 1765 of 2572
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
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MONITOR DESCRIPTION
The two monitors, Key-Off and Purge Flow, are used to detect malfunctions relating to DTC P0441. The
Key-Of f monitor is initiated by the ECM internal timer, known as the soak timer, 5 hours* after the ignition
switch is turned to OFF. The purge flow monitor runs while the engine is running.
1. KEY-OFF MONITOR
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 then 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.
Page 1766 of 2572
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
G36775
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
OK Malfunction
ON: Open
OFF: Closed
OFF: Vent ON: Closed
10
Standard
sec60
E EVAP Pressure when Purge VSV Stuck Open:
Leak PressureSecond 0.02 inch
Standard x 0.2
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(a) Purge VSV stuck open
In operation C, the vacuum pump creates negative pressure (vacuum) in the EVAP (Evaporative Emission)
system. The EVAP system pressure is then measured by the ECM using the pressure sensor. If the stabilized
system pressure is higher than [second 0.02 inch leak pressure standard x 0.2], the ECM interprets this as
the purge VSV (Vacuum Switching Valve) being stuck open. The ECM illuminates the MIL and sets the DTC
(2 trip detection logic).
Page 1768 of 2572
05-200
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
390 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
OBD II MONITOR SPECIFICATIONS (Key-off Monitor)
Monitor Strategy
Required Sensors/ComponentsPurge VSV and pump module
Frequency of OperationOnce per driving cycle
DurationWithin 15 minutes (varies with 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-
Atmospheric 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
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
Page 1770 of 2572
- DIAGNOSTICSSFI SYSTEM (3MZ-FE)
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0442 EVAPORATIVE EMISSION CONTROL
SYSTEM LEAK DETECTED (SMALL LEAK)
DTC P0455 EVAPORATIVE EMISSION CONTROL
SYSTEM LEAK DETECTED (GROSS LEAK)
DTC P0456 EVAPORATIVE EMISSION CONTROL
SYSTEM LEAK DETECTED (VERY SMALL
LEAK)
CIRCUIT DESCRIPTION
The circuit description can be found in the EVAP INSPECTION PROCEDURE (see page 05-679).
INSPECTION PROCEDURE
Refer to the EVAP INSPECTION PROCEDURE (see page 05-679).
MONITOR DESCRIPTION
The ECM tests the Evaporative Emissions (EVAP) system using the fuel tank pressure sensor, Canister
Close Valve (CCV), and EVAP VSV. The ECM closes the EVAP system and creates negative pressure (vacu-
um) into it. The ECM then monitors the internal pressure using the fuel tank pressure sensor (refer to the
Leak Check graphic).
P0442, P0455 and P0456
A leak in the evaporative emission system prompts the ECM to set DTC P0442, P0455 or P0456.
The ECM checks if the EVAP has leaks. First, the ECM opens the EVAP VSV while the CCV is closed. After
a sufficient amount of time has passed, a high negative pressure(vacuum) will develop in the fuel tank as
air is drawn into the intake manifold. The EVAP VSV is then closed. The ECM then monitors the pressure
increase (loss of vacuum) in the fuel tank. If the pressure rises beyond a specified amount, the ECM deter-
mines that the system has a leak, turns on the MIL and outputs a DTC.
The ECM has separate DTCs for small and large leaks:
(1) DTC P0442 is set when the internal fuel tank pressure has a large increase and the EVAP system
has a small leak.
(2) DTC P0455 is set when the EVAP system has a very large leak. The ECM tries to create negative
pressure (vacuum) in the fuel tank by opening the EVAP VSV while the CCV is closed. However,
the fuel tank pressure does not decrease beyond a specified threshold.
(3) DTC P0456 is set when the internal fuel tank pressure increases slightly and the EVAP system
has a very small leak.
05MOQ-01
Page 1771 of 2572
05-564
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2005 HIGHLANDER REPAIR MANUAL (RM1144U)DTC No.
DTC Detection ConditionTrouble Area
P0442
P0455
P0456
Cold engine start.
EVAP VSV has been operated and turned OFF, sealing nega-
tive pressure (vacuum) in system.
ECM begins to monitor fuel tank pressure increase and one
of the following occurs (2 trip detection logic):
(a) Rapid, sharp increase in pressure occurs, indicating small
leak in EVAP system. DTC P0442 is set.
(b) Negative pressure (vacuum) is not strong enough, indicat-
ing large hole in EVAP system. DTC P0455 is set.
(c) Increase in pressure above expected amount occurs, indi-
cating small leak in EVAP system. DTC P0456 is set.
Vacuum hose has cracks, holes, or is blocked, damaged or
disconnected
Fuel tank cap incorrectly installed
Fuel tank cap has cracks or is damaged
Open or short in vapor pressure sensor circuit
Vapor pressure sensor
Open or short in EVAP VSV circuit
EVAP VSV
Open or short in CCV circuit
CCV
Fuel tank has cracks, holes, or is damaged
Charcoal canister has cracks, holes, or is damaged
Fuel tank over fill check valve cracks, or is damaged
ECM
Page 1772 of 2572
A76973
ECM
Fuel Tank
Charcoal
Canister EVAP VSV
Vapor Pressure
Sensor
CCV EVAP Service
PortIntake Air
Throttle
Valve
Fuel Tank Cap
Air Cleaner Case
Charcoal Canister Filter Charcoal Filter
Intake Manifold
Purge Line
Air Inlet Line EVAP Line Purge Line
Diaphragm
(Atmospheric Pressure)
Restrictor
Passage
When EVAP VSV is opened, partial vacuum is created
When CCV is
opened, air is
drawn or released
Leak Detection Area
(Purge Valve)
Air Cleaner Filter
- DIAGNOSTICSSFI SYSTEM (3MZ-FE)
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