engine TOYOTA HIGHLANDER 2001 Service Repair Manual
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 2001, Model line: HIGHLANDER, Model: TOYOTA HIGHLANDER 2001Pages: 2572, PDF Size: 34.8 MB
Page 1648 of 2572
A81695
A80019A91528
Wire Harness Side
E8
ECM
H10
Heated Oxygen Sensor
HT +B
OX E1 HT1B
A80019
A90291A91529
Wire Harness Side
H10
Heated Oxygen Sensor
HT
+B
OX
E1
EFI RelayEngine Room J/B
05-80
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
270 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
4 CHECK WIRE HARNESS (ECM - HEATED OXYGEN SENSOR, HEATED OXYGEN
SENSOR - EFI RELAY)
(a) Check the wire harness between the ECM and heated ox-
ygen sensor.
(1) Disconnect the E8 ECM connector.
(2) Disconnect the H10 heated oxygen sensor connec-
tor.
(3) Measure the resistance of the wire harness side
connectors.
Standard:
Tester ConnectionSpecified Condition
H10-2 (HT) - E8-21 (HT1B)Below 1 W
H10-2 (HT) or E8-21 (HT1B) - Body ground10 kW or higher
(b) Check the wire harness between the heated oxygen sen-
sor and EFI relay.
(1) Disconnect the H10 heated oxygen sensor connec-
tor.
(2) Remove the EFI relay from the engine room J/B.
(3) Measure the resistance of the wire harness side
connectors.
Standard:
Tester ConnectionSpecified Condition
H10-1 (+B) - J/B EFI relay terminal 3Below 1 W
H10-1 (+B) or J/B EFI relay terminal 3 -Body ground10 kW or higher
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE ECM (See page 10-9)
Page 1650 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
Operation C: EVAP System Pressure Measurement
Air Filter
Purge VSV: OFFOFF (vent)
ON
OFF
OFF
ON
ON (closed)ON
ON
ON (closed)
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)(From August, 2004)
05-191
381 Author: Date:
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) after 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 1652 of 2572
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)(From August, 2004)
05-193
383 Author: Date:
OBD II MONITOR SPECIFICATIONS
Monitor Strategy
Required Sensors/ComponentsPump 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:-
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 1656 of 2572
05-82
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
272 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR DESCRIPTION
If there is a defect in the sensor, or an open or short circuit, the voltage level will deviate from the normal
operating range. The ECM interprets this deviation as a defect in the MAF meter and sets a DTC.
Example:
The sensor voltage output is less than 0.2 V or more than 4.9 V and either condition continues for more than
3 seconds.
MONITOR STRATEGY
Related DTCs
P0100: MAF meter range check (Chattering)
P0102: MAF meter range check(Low voltage)
P0103: MAF meter range check (High voltage)
Required sensors / components (Main)MAF Meter
Required sensors / components (Related)CKP (Crank shaft position) sensor
Frequency of operationContinuous
Duration3 sec.
MIL operationImmediate: Engine RPM is less than 4,000 rpm
2 driving cycles: Engine RPM is 4,000 rpm or more
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these DTCs are not presentSee page 05-16
TYPICAL MALFUNCTION THRESHOLDS
P0100:
MAF meter voltageLess than 0.2 V, or more than 4.9 V
P0102:
MAF meter voltageLess than 0.2 V
P0103:
MAF meter voltageMore than 4.9 V
COMPONENT OPERATING RANGE
MAF meter voltageBetween 0.4 and 2.2 V
Page 1657 of 2572
A90347
Y
BatteryFL
MainEngine Room J/BB-W
EFI
RelayM1
MAF Meter
MREL
W-B4 1
WB-R
EVGVG
3
2
1
AEB1
133 1
P-LR
2
52D
J2
J/CL-W30
E7
E7
8
E5ECM
EFI
NO. 1
EHB29 +B
E2GVG 1
EFI NO. 2
22 Engine Room R/B No. 2
12
IK3
W
3
12B 5
2F 3
2I
F7
FL
Block
Assy5 V
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-83
273 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
WIRING DIAGRAM
Page 1658 of 2572
A54396
+B (+) Wire Harness Side
M1
MAF Meter
05-84
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
274 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 READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (MAF RATE)
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Start the engine.
(c) Push the hand-held tester or the OBD II scan tool main switch ON.
(d) On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DATA LIST / ALL / MAF. Read the values.
Result:
Air Flow Rate (gm/second)Proceed to
0.0A
271.0 or moreB
MAF rate greater than 1 but less than 270.0 *C
HINT:
*: The value must change when the throttle valve is opened or closed.
B Go to step 6
C CHECK FOR INTERMITTENT PROBLEMS
(See page 05-9)
A
2 CHECK MASS AIR FLOW METER (POWER SOUCE VOLTAGE)
(a) Turn the ignition switch ON.
(b) Disconnect the M1 MAF meter connector.
(c) Measure the voltage of the wire harness side connector.
Standard:
Tester ConnectionSpecified Condition
M1-1 (+B) - Body ground9 to 14 V
NG Go to step 5
OK
Page 1659 of 2572
A76903
VG (+) EVG (-)
E7
ECM
Y
A54396
A81699
A85482
Wire Harness Side
M1
MAF Meter
EVG VG
E7
ECM
EVG
VG
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-85
275 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 INSPECT ECM (VG VOLTAGE)
(a) Start the engine.
(b) Measure the voltage of the ECM connector.
Standard:
Tester ConnectionConditionSpecified Condition
E7-30 (VG) - E7-29 (EVG)Engine is idling0.5 to 3.0 V
HINT:
The shift position should be P or N and the A/C switch should
be turned OFF.
OK REPLACE ECM (See page 10-9)
NG
4 CHECK WIRE HARNESS (MAF METER - ECM)
(a) Disconnect the M1 MAF meter connector.
(b) Disconnect the E7 ECM connector.
(c) Measure the resistance of the wire harness side connec-
tors.
Standard:
Tester ConnectionSpecified Condition
M1-3 (VG) - E7-30 (VG)
M1-2 (EVG) - E7-29 (EVG)Below 1 W
M1-3 (VG) or E7-30 (VG) - Body ground10 kW or higher
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
REPLACE MASS AIR FLOW METER
Page 1660 of 2572
A54396
A90291A90959
Wire Harness Side
M1
MAF Meter
+B (+)
EFI RelayEngine Room J/B
A76903
EVG
E7
ECM
05-86
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
276 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
5 CHECK WIRE HARNESS (MAF METER - EFI RELAY)
(a) Disconnect the M1 MAF meter connector.
(b) Remove the EFI relay from the engine room J/B.
(c) Measure the resistance of the wire harness side connec-
tors.
Standard:
Tester ConnectionSpecified Condition
M1-1 (+B) - J/B EFI relay terminal 3Below 1 W
M1-1 (+B) or J/B EFI relay terminal 3 -Body ground10 kW or higher
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
INSPECT ECM POWER SOURCE CIRCUIT (See page 05-312)
6 INSPECT ECM (SENSOR GROUND)
(a) Measure the resistance of the ECM connector.
Standard:
Tester ConnectionSpecified Condition
E7-29 (EVG) - Body groundBelow 1 W
NG REPLACE ECM (See page 10-9)
OK
Page 1662 of 2572
05-88
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
278 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P0101 MASS OR VOLUME AIR FLOW CIRCUIT
RANGE/PERFORMANCE PROBLEM
CIRCUIT DESCRIPTION
Refer to DTC P0100 on page 05-81.
DTC No.DTC Detection ConditionTrouble Area
P0101
High voltage:
Conditions (a), (b) and (c) continue for more than 10 seconds
(2 trip detection logic):
(a) Engine speed less than 2,000 rpm
(b) Engine coolant temperature 70C (158F) or higher
(c) Voltage output of Mass Air Flow (MAF) meter more than 2.2
V (varies with Throttle Position [TP] sensor voltage)
Low voltage:
Conditions (a) and (b) continue for more than 10 seconds
(2 trip detection logic):
(a) Engine speed more than 300 rpm
(b) Voltage output of MAF meter less than 0.65 V
(varies with TP sensor voltage)
MAF meter
MONITOR DESCRIPTION
The MAF meter is a sensor that measures the amount of air flowing through the throttle valve. The ECM uses
this information to determine the fuel injection time and to provide an appropriate air-fuel ratio.
Inside the MAF meter, there is a heated platinum wire which is exposed to the flow of intake air. By applying
a specific electrical current to the wire, the ECM heats it to a specific temperature. The flow of incoming air
cools both the wire and an internal thermistor, changing their resistance. To maintain a constant current val-
ue, the ECM varies the voltage applied to these components of the MAF meter. The voltage level is propor-
tional to the air flow through the sensor, and the ECM uses it to calculate the intake air volume.
If there is a defect in the sensor, or an open or short in the circuit, the voltage level deviates from the normal
operating range. The ECM interprets this deviation as a malfunction in the MAF meter and sets the DTC.
Example:
If the voltage is more than 2.2 V, or less than 0.65 V while idling, the ECM determines that there is a malfunc-
tion in the MAF meter and sets the DTC.
MONITOR STRATEGY
Related DTCsP0101: MAF Meter Rationality (Low voltage)
P0101: MAF Meter Rationality (High voltage)
Required sensors/ components (Main)MAF meter
Required sensors/ components (Related)Crankshaft position sensor, ECT sensor, Throttle position sensor
Frequency of operationContinuous
Duration10 seconds
MIL operation2 driving cycles
Sequence of operationNone
051ZM-14
Page 1663 of 2572
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-89
279 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
All:
The monitor will run whenever this DTC is not presentSee page 05-16
MAF Meter Rationality (High Voltage):
Engine RPMLess than 2,000 rpm
ECT70°C (158°F) or more
MAF meter voltage4.9 V or less
MAF Meter Rationality (Low Voltage):
Engine RPMMore than 300 rpm
MAF meter voltage0.2 V or more
Fuel cutOFF
TYPICAL MALFUNCTION THRESHOLDS
MAF Meter Rationality (High Voltage):
MAF meter voltageMore than 2.2 V (varies with throttle position sensor voltage)
MAF Meter Rationality (Low Voltage):
MAF meter voltageLess than 0.65 V (varies with throttle position sensor voltage)
WIRING DIAGRAM
Refer to DTC P0100 on page 05-81.
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 OTHER DTC OUTPUT (IN ADDITION TO DTC P0101)
(a) Read the DTC using the hand-held tester or the OBD II scan tool.
Result:
Display (DTC Output)Proceed to
P0101 and other DTCs are outputA
Only P0101 is outputB
HINT:
If any other codes besides P0101 are output, perform the troubleshooting for those codes first.
B REPLACE MASS AIR FLOW METER
A
GO TO RELEVANT DTC CHART (See page 05-48)