2001 TOYOTA AVALON ignition

B04941
- DIAGNOSTICSENGINE
DI-1 1
167 Author
: Date
:
2001 AVALON (RM808U)
OK
8 Check for spark.
PREPARATION:
(a) Remove the ignition coil from the spark plug.
(b) Remove the spark plug.
(c) Install the spark plug to the ignition coil.
(d) Disconnect the injector connector.
(e) Be sure to ground the screw of the spark plug securely.
CHECK:
Check if spark occurs while the engine is being cranked.
NOTICE:

Do not crash the electrode gap.

To prevent excess fuel being injected from the injec-
tors during this test, don't crank the engine for more
than 5 - 10 seconds at a time.
NG Proceed to page IG-1, and continue to trouble-
shoot.
OK
Proceed to problem symptoms table on page
DI-22.
7. ENGINE OPERATING CONDITION
NOTICE:
The values given below for ºNormal Conditionº are representative values, so a vehicle may still be
normal even if its value varies differ from those listed here. So do not decide whether a part is faulty
or not solely according to the ºNormal Conditionº here.
(a) CARB mandated signals.
TOYOTA hand-held tester displayMeasurement ItemNormal Condition*
FUEL SYS #1
Fuel System Bank 1
OPEN: Air-fuel ratio feedback stopped
CLOSED: Air-fuel ratio feedback operating
Idling after warming up: CLOSED
FUEL SYS #2
Fuel System Bank 2
OPEN: Air-fuel ratio feedback stopped
CLOSED: Air-fuel ratio feedback operating
Idling after warming up: CLOSED
CALC LOADCalculator Load: Current intake air volume as a
proportion of max. intake air volumeIdling: 13.1 - 18.7 %
Racing without load (2,500rpm): 11.7 - 17.3 %
COOLANT TEMPEngine Coolant Temp. Sensor ValueAfter warming up: 80 - 95°C (176 - 203°F)
SHORT FT #1Short-term Fuel Trim Bank 10 ± 20 %
LONG FT #1Long-term Fuel Trim Bank 10 ± 20 %

DI-12
- DIAGNOSTICSENGINE
168 Author
: Date
:
2001 AVALON (RM808U)SHORT FT #2
Short-term Fuel Trim Bank 20 ± 20 %
LONG FT #2Long-term Fuel Trim Bank 20 ± 20 %
ENGINE SPDEngine SpeedIdling: 650 - 750 rpm
VEHICLE SPDVehicle SpeedVehicle stopped: 0 km/h (0 mph)
IGN ADVANCEIgnition Advance: Ignition Timing of Cylinder No.1Idling: BTDC 10 - 25.0°
INTAKE AIRIntake Air Temp. Sensor ValueEquivalent to Ambient Temp.
MAFAir Flow Rate Through Mass Air Flow Meter
Idling: 3.3 - 4.7 gm/sec.
Racing without load (2,500 rpm):
10.4 - 15.4 gm/sec.
THROTTLE POSVoltage Output of Throttle Position Sensor Calcu-
lated as a percentage: 0 V "0 %, 5 V "100 %Throttle valve fully closed: 7 - 11 %
Throttle valve fully open: 65 - 75 %
O2FT B1 S1Oxygen Sensor Fuel Trim Bank 1 Sensor 1
(Same as SHORT FT #1)0 ± 20 %
O2S B1 S2Voltage Output of Oxygen Sensor Bank 1 Sensor
2Driving 50 km/h (31 mph): 0.05 - 0.95 V
O2FT B2 S1Oxygen Sensor Fuel Trim Bank 2 Sensor 1
(Same as SHORT FT #2)0 ± 20 %
A/FS B1 S1Voltage Output of A/F Sensor Bank 1 Sensor 1Idling: 2.8 - 3.8 V
A/FS B2 S1Voltage Output of A/F Sensor Bank 2 Sensor 1Idling: 2.8 - 3.8 V
A/FFT B1 S1A/F Sensor Fuel Trim Bank 1 Sensor 1
(Same as SHORT FT #1)0 ± 20 %
A/FFT B2 S1A/F Sensor Fuel Trim Bank 2 Sensor 1
(Same as SHORT FT #1)0 ± 20 %
*: If no conditions are specifically stated for ºldlingº, it means the shift lever is at N or P position, the A/C switch
is OFF and all accessory switches are OFF.
(b) TOYOTA Enhanced Signals.
TOYOTA hand-held tester displayMeasurement ItemNormal Condition*
MISFIRE RPMEngine RPM for first misfire rangeMisfire 0: 0 rpm
MISFIRE LOADEngine load for first misfire rangeMisfire 0: 0 g/r
INJECTORFuel injection time for cylinder No.1Idling: 1.6 - 2.9 ms
IAC DUTY RATIOIntake Air Control Valve Duty Ratio
Opening ratio rotary solenoid type IAC valveIdling: 27 - 47 %
STARTER SIGStarter SignalCranking: ON
CTP SIGClosed Throttle Position SignalThrottle fully closed: ON
A/C SIGA/C Switch SignalA/C ON: ON
PNP SWPark/Neutral Position Switch SignalP or N position: ON
ELCTRCL LOAD SIGElectrical Load SignalDefogger switch ON: ON
STOP LIGHT SWStop Light Switch SignalStop light switch ON: ON
PS OIL PRESS SWPower Steering Oil Pressure Switch SignalTurn steering wheel: ON
FC IDLFuel Cut Idle: Fuel cut when throttle valve fully
closed, during decelerationFuel cut operating: ON
FC TAUFuel Cut TAU: Fuel cut during very light loadFuel cut operating: ON
CYL#1 - CYL#6Abnormal revolution variation for each cylinder0 %
IGNITIONTotal number of ignition for every 1,000 revolu-
tions0 - 3,000
INTAKE CTRL VSVIntake Air Control Valve VSV SignalVSV operating: ON
A/C CUT SIGA/C Cut SignalA/C S/W OFF: ON
FUEL PUMPFuel Pump SignalIdling: ON

DI1AS-20
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI-605
761 Author
: Date
:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
DTC B2795/99 Unmatched Key Code
This DTC is output when an unregistered key is inserted. When this DTC is output, delete DTC and insert
the key that a customer keeps to check that B2795 is output.
When a key that outputs B2795 is found, register this key. when B2795 is not output, there is a possibility
that the unregistered key has been inserted before. (ECM is normal.)
Inquire a customer the condition of using the system to find the cause of the trouble.
(Example: Another key has been inserted, etc..)
DTC No.DTC Detecting ConditionTrouble Area
B2795/99No communication
Key
INSPECTION PROCEDURE
1 Delete DTC and insert all the presently available keys to check whether the en-
gine starts or not.
HINT:
When inserting the key that does not start the engine, DTC (B 2795) is stored in memory.
RESULT:
OKAll keys starts the engine.
NGA specific key does not start the engine.
OK No problem.
HINT:
If the result is ºOKº, please confirm whether or not customers
have ever inserted the unregistered key or the immobiliser key
(with transponder chip) of other vehicle in the ignition key cylin-
der, and find out the cause of detecting DTC.
NG
Register the key that does not start the en-
gine.

- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI-607
763 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Delete DTC and insert all the presently available keys to check whether the en-
gine starts or not.
RESULT:
AAll keys start the engine.
BA specific key does not start the engine. In this case, DTC
(B 2796) is stored in memory.
CAll keys do not start the engine. In this case, DTC (B 2796)
is stored in memory.
A No problem at this time.
HINT:
If the result is ºAº, please confirm whether or not customers
have ever inserted the key (without transponder chip) of other
vehicle in the ignition key cylinder, and find out the cause of de-
tecting DTC.
B The transponder chip of a specific key is defec-
tive. Replace the key.
C
2 Check transponder key coil (See page BE-181).
NG Replace transponder key coil.
OK
3 Check harness and connector between transponder key amplifier and ECM.
NG Repair or replace harness and connector.
OK

DI-612
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
768 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check EFI fuse.
CHECK:
Check continuity of EFI fuse.
OK:
Continuity
NG Replace the failure fuse.
OK
2 Check voltage between terminals EFI and GND of Transponder Key ECU connec-
tor.
PREPARATION:
(a) Turn ignition switch OFF.
(b) Disconnect the Transponder Key ECU connector.
CHECK:
Measure voltage between terminals +B and GND.
OK:
Voltage: 10 - 14 V
OK Proceed to next circuit inspection shown in
problem symptoms table (See page DI-604).
NG
3 Check wireharness and connector between Transponder Key ECU and body
ground.
NG Repair or replace wireharness or connector.
OK
Check and repair wirehareness and connec-
tor between Transponder Key ECU and Bat-
tery.

DI1AN-06
I12540
Engine Room Junction Block

EFI Fuse
Instrument Panel Junction Block

IGN FuseECMIgnition Switch Assembly

Transponder Key Amplifier

Transponder Key Coil

Key Unlock Warning Switch
Security Indicator
DI-602
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
758 Author
: Date
:
2001 AVALON (RM808U)
PARTS LOCATION

DI6LA-01
F07887DLC3Hand-held
Tester
N09214
DLC3
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI-599
755 Author
: Date
:
2001 AVALON (RM808U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Description
ECM controls the function of immobiliser on this vehicle.
Data of the immobiliser or DTC can be read form DLC3 of
the vehicle. When a trouble occurs on immobiliser, check
engine warning light does not light up but DTC inspection
is performed.
Therefore when there seems to be a trouble on immobilis-
er, use hand-held tester or SST to check and trouble-
shoot it.
(b) Check the DLC3.
The vehicle's ECM uses ISO 14230 for communication.
The terminal arrangement of DLC3 complies with SAE
J1962 and matches the ISO 14230 format.
Terminal No.Connection / Voltage or ResistanceCondition
7Bus
Line / Pulse generationDuring transmission
4Chassis Ground e Body Ground / 1 W or lessAlways
16Battery Positive e Body Ground / 9 ~ 14 VAlways
HINT:
If your display shows ºUNABLE TO CONNECT TO VEHICLEº
when you have connected the cable of the hand-held tester to
DLC3, turned the ignition switch ON and operated the hand-
held tester, there is a problem on the vehicle side or tool side.

If communication is normal when the tool is connected to
another vehicle, inspect DLC3 on the original vehicle.

If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department listed in the
tool's instruction manual.

DI-600
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
756 Author
: Date
:
2001 AVALON (RM808U)
2. INSPECT DIAGNOSIS (Normal Mode)
(a) Check the DTC using hand-held tester.
NOTICE:
Hand- held tester only: When the diagnosis system is
switched from normal mode to check mode, it erases all
DTCs and freezed frame data recorded in normal mode. So
before switching modes, always check the DTCs and
freezed frame data, and note them down.
(1) Prepare the hand-held tester.
(2) Connect the hand-held tester to DLC3.
(3) Turn the ignition switch ON and push the hand-held
tester main switch ON.
(4) Use the hand-held tester to check the DTCs and
freezed frame data, note them down. (For operating
instructions, see the hand-held tester instruction
book.)
(5) See page DI-601 to confirm the details of the DTCs.
(b) Clear the DTC.
The following operations will erase the DTCs and freeze
frame data.
(1) Operating the OBD ll scam tool (complying with
SAEJ1978) or hand-held tester to erase the codes.
(See the OBD ll scan tool's instruction book for op-
erating instructions.)
(2) Disconnecting the battery terminals or EFI fuse.