2001 TOYOTA HIGHLANDER Service Repair Manual

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Page 1905 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-271
461 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these DTCs are not presentSee page 05-16

Page 1906 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A90305
23
A1A-
MREL
AHA1A
A1A+ECM
2D31
8 B-W
B-R
E8
E8
E5E8
W-B
BRBR
B Y
11
F7
FL Block
AssyEFI
RelayA6
A/F Sensor
J7
J/C Engine
Room J/B
A 1
43 2
2
3
FL
Main
Battery
EHShielded
Engine
Room R/B

Page 1907 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual A79199
Vehicle Speed
38 to 75 mph
(60 to 120 km/h)
Idling
Ignition Switch OFF
3 to 5 minutes
Time 2 minutes
(a), (b)(c)(d)
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-273
463 Author: Date:
2005 HIGHLANDER R

A79199
Vehicle Speed
38 to 75 mph
(60 to 120 km/h)
Idling
Ignition Switch OFF
3 to 5 minutes
Time 2 minutes
(a), (b)(c)(d)
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-273
463 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
CONFIRMATION DRIVING PATTERN
(a) Connect the hand-held tester to the DLC3.
(b) Switch the hand-held tester from normal mode to check mode (see page 05-40).
(c) Start the engine and warm it up with all the accessory switched OFF.
(d) Drive the vehicle at 38 to 75 mph (60 to 120 km/h) and engine speed at 1,400 to 3,200 rpm for 3 to
5 minutes.
HINT:
If a malfunction exists, the MIL will be illuminated during step (d).
NOTICE:
If the conditions in this test are not strictly followed, detection of a malfunction will not occur. If you
do not have a hand-held tester, turn the ignition switch OFF after performing steps (c) and (d), then
perform steps (c) and (d) again.
INSPECTION PROCEDURE
HINT:
Hand-held tester only:
It is possible the malfunctioning area can be found using the ACTIVE TEST A/F CONTROL operation. The
A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble
areas are malfunctioning or not.
(a) Perform the ACTIVE TEST A/F CONTROL operation.
HINT:
The A/F CONTROL operation lowers the injection volume 12.5 % or increases the injection volume 25 %.
(1) Connect the hand-held tester to the DLC3 on the vehicle.
(2) Turn the ignition switch ON.
(3) Warm up the engine by running the engine at 2,500 rpm for approximately 90 seconds.
(4) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
(5) Perform the A/F CONTROL operation with the engine idle (press the right or left button).
Result:
A/F sensor reacts in accordance with increase and decrease of injection volume:
+25 % " RICH output: Less than 3.0 V
-12.5 % " LEAN output: More than 3.35 V
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume:
+25 % " RICH output: More than 0.55 V
-12.5 % " LEAN output: Less than 0.4 V

Page 1908 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual +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)Ma

+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) 05-274
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
464 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
NOTICE:
The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about
20 seconds of delay.
The following A/F CONTROL procedure enables a technician to check and graph the voltage outputs of both
the A/F sensor and the heated oxygen sensor.
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.
HINT:
If DTC P2195 or P2196 is displayed, check bank 1 sensor 1 circuit.
A low A/F sensor voltage could be caused by a RICH air-fuel mixture. Check for conditions that would
cause the engine to run with a RICH air-fuel mixture.
A high A/F sensor voltage could be caused by a LEAN air-fuel mixture. Check for conditions that would
cause the engine to run with a LEAN air-fuel mixture.
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 determine 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.

Page 1909 of 2572

TOYOTA HIGHLANDER 2001 Service Repair Manual - DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-275
465 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
1 CHECK OTHER DTC OUTPUT (IN ADDITION TO A/F SENSOR DTC)
(a) Read the DTC using the hand-held test

Page 1910 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
05-276
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
466 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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 A/F sensor or ECM, you will observe a constant volt-
age.
*: Voltage when using the OBD II scan tool.
OK Go to step 13
NG

Page 1911 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)
05-277
467 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE

Page 1912 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

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