2001 TOYOTA HIGHLANDER Service Repair Manual

wheel bolt torque service interval instrument panel clock fuel cap fuel tank removal

Page 1617 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A72304
Engine
RPMEngine
RPM (1) Idle (2) Approximately 2,500 rpm
Fuel Cut
When A/F sensor circuit is malfunctioning,
voltage output does not change A/F
Sensor
Voltage A/F
Sensor
Voltage
(1) Idl

A72304
Engine
RPMEngine
RPM (1) Idle (2) Approximately 2,500 rpm
Fuel Cut
When A/F sensor circuit is malfunctioning,
voltage output does not change A/F
Sensor
Voltage A/F
Sensor
Voltage
(1) Idle
Fuel Cut (3) Approximately 4,000 rpm
ºCondition (1), (2)º
Change of approximately 3.3 V Normal Condition
Malfunction Condition
ºCondition (3)º
3.8 V or More(1) Idle (2) Approximately 2,500 rpm(3) Approximately 4,000 rpm
(1) Idle
05-306
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
496 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
Standard:
Condition (1) and (2)
Voltage change of 3.3 V (0.66 V)* (between approximately 3.1 to 3.5 V) as shown in the illustra-
tion.
Condition (3)
A/F sensor voltage increases to 3.8 V (0.76 V)* or more when fuel is cut during engine decelera-
tion as shown in the illustration.
*: Voltage when using the OBD II scan tool.
HINT:
Whenever the A/F sensor output voltage remains at approximately 3.3 V (0.660 V)* (see ºMalfunction
Conditionº graphic) under any condition as well as the above conditions, the A/F sensor may have an
open circuit. This will happen also when the A/F sensor heater has an open circuit.
Whenever the A/F sensor output voltage remains at a certain value of approximately 3.8 V (0.76 V)*
or more, or 2.8 V (0.56 V)* or less (see ºMalfunction Conditionº graphic) under any condition as well
as the above conditions, the A/F sensor may have a short circuit.
The ECM will stop fuel injection (fuel is cut) during engine deceleration. This will cause a LEAN condi-
tion and should result in a momentary increase in the A/F sensor output voltage.
The ECM must establish a closed throttle position learned value to perform fuel cut. If the battery termi-
nal has been disconnected, the vehicle must be driven over 10 mph (16 km/h) to allow the ECM to learn
the closed throttle position.
When the vehicle is driven:
The output voltage of the A/F sensor may be below 2.8 V (0.76 V)* during fuel enrichment. For the
vehicle, this translates to a sudden increase in speed with the accelerator pedal fully depressed when
trying to overtake another vehicle. The A/F sensor is functioning normally.
The A/F sensor is a current output element, and therefore the current is converted into voltage inside
the ECM. If measuring voltage at connectors of the A/F sensor or ECM, you will observe a constant
voltage.
*: Voltage when using the OBD II scan tool.
OK Go to step 14

Page 1618 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A52607
AF-AF+
A6
A/F sensor
B60778
5
12 312
5
3
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-307
497 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
NG
3 INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTA

Page 1619 of 2572

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
A

Page 1620 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-309
499 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 CHECK CONNECTION OF PCV HOSE
OK: PCV hose is connected correctly and PCV hose has no damage.
NG

Page 1621 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 05-310
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
500 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
12 READ OUTPUT DTC (A/F SENSOR DTC OUTPUT AGAIN)
(a) Read the DTC using the hand-held tester or th

Page 1622 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-31 1
501 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
17 PERFORM CONFIRMATION DRIVING PATTERN (See page 05-269)
HINT:
Clear all DTCs prior to performin

Page 1623 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A71007
MAF Meter Crankshaft Position Sensor
Actual Valve TimingCorrection Target Valve Timing
Feedback
Duty Control ECM
OCV
Vehicle Speed SignalECT Sensor Throttle Position Sensor
Camshaft Position Se

Page 1624 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual 05-56
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
246 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR DESCRIPTION
After the ECM sends the ºtargetº duty-cycle signal to the OCV, the ECM monito

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