engine TOYOTA HIGHLANDER 2001 Service Repair Manual
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Page 1592 of 2572
I39188
Multi-Display
Center J/B Instrument Panel J/B
Engine Room R/B
Instrument Panel J/B I15
IGNITION SW
F7
FL Block
Center J/BIG
ACC
+B1
GND1
Battery FL MAINALTRAD No.2ECU-IG
W-B W-B
IB W
WB IG1 AM1 ACC
WAM1 CRT
VVJ17
J/C
VVBRO
V R
M3 10
M311
M3 12 3E3 3G7
3A 13 3A1
1K3 1K9
1C2 1C7
L G
IK2 16
A
AIL16
2
1 2 2
42 3
1C6
211A1
1
3 2
3F13
3I6
M33 05-1828
- DIAGNOSTICSNAVIGATION SYSTEM
2018 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
POWER SOURCE CIRCUIT (MULTI-DISPLA Y)
CIRCUIT DESCRIPTION
This circuit provides power to the multi-display.
WIRING DIAGRAM
05CEF-10
Page 1607 of 2572
05-1674
- DIAGNOSTICSAUDIO SYSTEM
1864 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
NOISE OCCURS
INSPECTION PROCEDURE
1 CHECK OF SPEAKER INSTALLATION
(a) Check the speaker installation condition.
(1) Check that each speaker is securely installed.
OK: Malfunction disappears.
HINT:
The radio is equipped with a noise prevention system that blocks only excessively loud noise. If loud noise
occurs, check whether or not the ground on the antenna installation part and the proper noise-prevention
equipment are all installed, and whether or not there is improper wiring.
Condition in which noise occursNoise type
Depressing the acceleration pedal increases the noise, and stopping the
engine stops the noise immediately.Alternator noise
Noise occurs during A/C or the heater operation.Blower motor noise
Rapid acceleration during the drive on an unpaved road or after the ignition
switch is turned on makes noise.Fuel pump noise
Pressing and then releasing the horn switch, and keeping pressing the horn
switch makes noise.Horn noise
Quiet noise is heard while the engine is running, but stops with the engine.Ignition noise
Noise occurs in turn with the blink of the turn signal flash.Flasher noise
Noise occurs during window washer operation.Washer noise
Noise occurs while the engine is running, and it continues even after the en-
gine is stopped.Water temperature sensor noise
Noise occurs during wiper operation.Wiper noise
Noise occurs when the brake pedal is depressed.Stop light switch noise
OthersStatic electricity on the vehicle
HINT:
Identify the condition in which the noise occurs, and check the noise filter on the related part.
Make sure first that there is no noise from outside. Failing to do so makes the noise occurrence source
detection difficult and leads to misdiagnosis.
The noise should be removed in descending order of loudness.
NG INSTALL IT PROPERLY
OK
IDENTIFICATION OF NOISE SOURCE
055M1-10
Page 1608 of 2572
05F45-05
01 BANK 1 - SENSOR 1
01 BANK 1 - SENSOR 2
01 BANK 2 - SENSOR 1
01 BANK 2 - SENSOR 2
A21190
O2S TEST RESULT Screen 05-22
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
212 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
O2S TEST RESULT
1. INTRODUCTION
The O2S TEST RESULT refers to the results of the engine con-
trol module (ECM) when it monitors the oxygen sensor (O2S),
and it can be read using the hand-held tester or the generic
OBD II scan tool. Based on this, you can find the O2S's condi-
tions.
The ECM monitors the O2S for various data. You can read the
monitor result (TEST DATA) of each monitor item using the O2S
TEST RESULT. However, the output value of the TEST DATA
is the latest ºsnapshotº value that is taken after monitoring and
therefore it is not dynamic.
In this repair manual, the description of the O2S TEST RESULT
(for O2S related DTCs) are written in a table.
This table consists of 5 items:
(1) TEST ID (a code applied to each TEST DATA)
(2) Description of TEST DATA
(3) Conversion Factor (When conversion factor has a
value written in the table, multiply the TEST DATA
value appearing on the scan tool by the conversion
factor value. The result will be the required value.)
(4) Unit
(5) Standard Value
If the TEST DATA value appearing on the scan tool is out of the
standard value, the O2S is malfunctioning. If it is within the stan-
dard value, the O2S is functioning normally. However, if the val-
ue is on the borderline of the standard value, the O2S may mal-
function very soon.
2. HOW TO READ O2S TEST RESULT USING HAND-
HELD TESTER
(a) Connect the hand-held tester to the DLC3.
(b) On the tester screen, select the following menus: DIAG-
NOSIS / CARB OBDII / O2S TEST RESULT. A list of the
O2S equipped on the vehicle will be displayed.
Page 1612 of 2572
05ETG-02
05-1536
- DIAGNOSTICSLIGHTING SYSTEM
1726 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
OPERATION CHECK
1. ILLUMINATED ENTRY SYSTEM OPERATION CHECK
(a) Illuminated entry system controls the following lamps:
Ignition key cylinder lamp
Interior lamp (Room lamp assy No.1)
Personal lamp (Overhead J/B)
(b) Check that the lamps come on after:
(1) Unlocking any door that was closed and locked with the ignition switch off.
(c) Check that the lamps fade out after:
(1) Leaving the doors unlocked for 15 seconds
(2) Turning the ignition switch to the ACC or ON position
(3) Locking all the doors
(d) Check that the lamps stay ON for at least 15 seconds after opening any of the doors, then fade out
again after 15 seconds.
(e) Check that the lamps fade out after:
(1) Leaving the doors unlocked for 15 seconds
(2) Locking all the doors
(f) Check that the lamps stay ON for at least 15 seconds after opening any of the doors, then fade out
again in 15 seconds after closing all the doors.
(g) Check that the lamps come on when opening any of the doors or turning the ignition switch off from
the ACC or ON position.
2. LIGHT AUTO TURN OFF OPERATION CHECK
(a) Turn the ignition switch to the ON position, and switch the headlamps into the TAIL or HEAD position.
(b) Turn the ignition switch off and open the driver's door, and check that the headlamps go off immediate-
ly.
(c) Turn the ignition switch to the ON position, and switch the headlamps into the AUTO position.
(d) Turn the ignition switch off and open the driver's door when operating the automatic light control sys-
tem, and check that the headlamps go off immediately.
3. AUTOMATIC LIGHT CONTROL OPERATION CHECK
HINT:
Perform the operation check at a location with bright surroundings.
(a) Turn the ignition switch to the ON position.
(b) Turn the headlamp dimmer switch to the AUTO position.
(c) Cover the automatic light control sensor and check that the taillamp and headlamp in order.
(d) Uncover the automatic light control sensor and check that the headlamp and taillamp go off in order.
4. DAYTIME RUNNING LIGHT OPERATION CHECK
(a) Check that the high beams come on when the headlamp switch is off with the engine running and park-
ing brake released.
(b) Check that the high beams go off when turning the headlamp dimmer switch into the TAIL or HEAD
(LOW) position under the condition as shown in (a).
(c) Check that the high beams go off when turning the ignition switch off under the condition as shown
in (a).
Page 1613 of 2572
A82390
Fast SensorSlow Sensor Locus Length
A/F Output (V)
Fuel Trim
05-302
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
492 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC P2A00 A/F SENSOR CIRCUIT SLOW RESPONSE
(BANK 1 SENSOR 1)
CIRCUIT DESCRIPTION
Refer to DTC P2195 on page 05-269.
DTC No.DTC Detection ConditionTrouble Area
P2A00
In conditions (a), (b) and (c), when A/F sensor output voltage
change value is below regular value against fuel trim change
value, ECM judges that A/F sensor circuit has slow response:
(2 trip detection logic)
(a) Engine is warmed up
(b) Engine speed 1,400 rpm or more
(c) Vehicle speed 60 to 120 km/h (37 to 74 mph)
Open or short in A/F sensor circuit
A/F sensor
A/F sensor heater
EFI relay
Open or short in A/F sensor and EFI relay circuits
Air induction system
Fuel pressure
Injector
PCV hose connection
ECM
MONITOR DESCRIPTION
The Air-Fuel ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. Based on the output
voltage, the ECM determines if the air-fuel ratio is RICH or LEAN and adjusts the stoichiometric air-fuel ratio.
The ECM also checks the fuel injection volume compensation value to check if the A/F sensor is deteriorating
or not. A/F sensor response deterioration is determined by the ratio of the A/F sensor output voltage variation
and fuel trim variation.
05EW5-06
Page 1614 of 2572
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-303
493 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
MONITOR STRATEGY
Related DTCsP2A00: A/F sensor slow response
Required sensors / components (Main)A/F sensor
Required sensors / components (Related)Vehicle speed sensor (VSS) and crankshaft position (CKP) sensor
Frequency of operationOnce per driving cycle
Duration60 sec.
MIL operation2 driving cycles
Sequence of operationNone
TYPICAL ENABLING CONDITIONS
The monitor will run whenever these DTCs are not presentSee page 05-16
Engine conditionRunning
Time after engine start120 sec. or more
Fuel system statusClosed Loop
A/F sensor statusActivated
IdleOFF
Time after idle OFF2 sec. or more
Engine RPM1,400 to 3,200 rpm
Vehicle speed60 to 120 km/h (37.5 to 75 mph)
Fuel cutOFF
Time after fuel cut is OFF2 sec. or more
Driving for 20 sec. or more40 km/h (25 mph) or more and 900 rpm or more
TYPICAL MALFUNCTION THRESHOLDS
Response rate deterioration level8 or more
MONITOR RESULT
Refer to page 05-24 for detailed information.
The test value and test limit information are described as shown in the following table. Check the monitor
result and test values after performing the monitor drive pattern (see page 05-26).
TID (Test Identification Data) is assigned to each emissions-related component.
TLT (Test Limit Type):
If TLT is 0, the component is malfunctioning when the test value is higher than the test limit.
If TLT is 1, the component is malfunctioning when the test value is lower than the test limit.
CID (Component Identification Data) is assigned to each test value.
Unit Conversion is used to calculate the test value indicated on generic OBD ll scan tools.
TID $06: A/F sensor
TLTCIDUnit ConversionDescription of Test DataDescription of Test Limit
0$01Multiply by 0.000244
(no dimension)Parameter for identify A/F sensor response
rateMalfunction threshold for A/F sensor deteri-
oration
WIRING DIAGRAM
Refer to DTC P2195 on page 05-269.
INSPECTION PROCEDURE
HINT:
Hand-held tester only:
The malfunctioning area can be found by the ACTIVE TEST A/F CONTROL operation. The A/F CONTROL
operation can determine if the A/F sensor, heated oxygen sensor or other suspected trouble areas are mal-
functioning or not.
Page 1615 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) 05-304
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
494 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
(a) Perform the ACTIVE TEST A/F CONTROL operation.
HINT:
The A/F CONTROL operation lowers the injection volume by 12.5% or increases the injection volume by
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 idling (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
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 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.
Page 1616 of 2572
- DIAGNOSTICSSFI SYSTEM (2AZ-FE)
05-305
495 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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:
DTC P2A00 may be also detected, when the air fuel ratio is stuck rich or lean.
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.
1 CHECK OTHER DTC OUTPUT (IN ADDITION TO A/F SENSOR DTC)
(a) Read the DTC using the hand-held tester or the OBD II scan tool.
Result:
DisplayProceed to
Only P2A00 is outputA
P2A00 and other codes is outputB
HINT:
If any other codes besides P2A00 is output, perform the troubleshoot on that DTC before.
B GO TO RELEVANT DTC CHART
(See page 05-48)
A
2 READ VALUE OF OBD II SCAN TOOL OR HAND-HELD TESTER (OUTPUT VOLT-
AGE OF A/F SENSOR)
(a) Connect the hand-held tester or the OBD II scan tool to the DLC3.
(b) Warm up the A/F sensor (bank 1 sensor 1) by running the engine at 2,500 rpm for approximately 90
seconds.
(c) Read the A/F sensor voltage output on the the hand-held tester or OBD II scan tool.
(d) Hand-held tester only:
On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / SNAPSHOT
/ MANUAL SNAPSHOT / USER DATA. Read the values.
(e) Select ºAFS B1 S1
/ ENGINE SPDº and press YES.
(f) Monitor the A/F sensor voltage carefully.
(g) Check the A/F sensor voltage output under the following conditions:
(1) Allow the engine to idle for 30 seconds.
(2) Run the engine at approximately 2,500 rpm. Do not suddenly change the rpm.
(3) Raise the engine speed to 4,000 rpm and quickly release the accelerator pedal so that the throttle
is fully closed.
Page 1617 of 2572
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
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 RESISTANCE)
(a) Disconnect the A6 A/F sensor connector.
(b) Measure the resistance of the A/F sensor terminals.
Standard:
Tester ConnectionConditionSpecified Condition
1 (HT) - 2 (+B)20C (68F)1.8 to 3.4 W
1 (HT) - 4 (AF-)-10 kW or higher
NG REPLACE AIR FUEL RATIO SENSOR
OK
4 INSPECT RELAY (EFI)
(a) Remove the EFI relay from the engine room J/B.
(b) Measure the resistance of the EFI relay.
Standard:
Tester ConnectionSpecified Condition
3 - 510 kW or higher
3 - 5Below 1 W
(when battery voltage is applied to terminals 1 and 2)
NG REPLACE RELAY
OK