2AZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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SFI SYSTEM
PRECAUTION
NOTICE:
• Perform RESET MEMORY (AT initialization) when
replacing the automatic transmission assembly,
engine assembly or ECM (See page AX-16).
• Perform REGISTRATION (VIN registration) when
replacing the ECM (See page ES-16).
HINT:
Initialization cannot be completed by removing the battery.
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2AZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM
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DEFINITION OF TERMS
Terms Definition
Monitor Description
Description of what ECM monitors and how detects malfunctions (monitoring purpose and
details).
Related DTCs
Group of diagnostic trouble codes that are output by ECM based on the same malfunction
detection logic.
Typical Enabling Condition
Preconditions that allow ECM to detect malfunctions.
With all preconditions satisfied, ECM sets DTC when monitored value(s) exceeds
malfunction threshold(s).
Sequence of Operation
Order of monitor priority, applied if multiple sensors and components involved in single
malfunction detection process.

EFI NO. 3 FUSE
EFI NO. 2 FUSE
EFI NO. 1 FUSE
(ENGINE ROOM J/B)
-
-
EFI MAIN FUSE
CIRCUIT OPENING RELAY
MASS AIR FLOW METER
EFI RELAY
INTEGRATION RELAY
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EXCEPT PZEV:
PURGE VSV
CANISTER
FUEL PUMP
ECM
ENGINE ROOM R/B AND
ENGINE ROOM J/B
EFI NO. 3 FUSE
EFI NO. 2 FUSE
EFI NO. 1 FUSE
(ENGINE ROOM J/B)
-
-
EFI MAIN FUSE
CANISTER PUMP MODULE

FUEL INJECTOR
IGNITION COIL
AIR-FUEL RATIO SENSOR
HEATED OXYGEN
SENSOR
PARK/NEUTRAL POSITION SW
CAMSHAFT POSITION SENSOR
CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY
CRANKSHAFT POSITION SENSOR
ENGINE COOLANT
TEMPERATURE
SENSOR
KNOCK SENSOR
THROTTLE BODY
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INSTRUMENT PANEL J/B
COMBINATION METER
CLUTCH START SWITCH
IGNITION SWITCH
STOP LIGHT SW
DLC3
- IGN FUSE
- STOP FUSE
ACCELERATOR PEDAL ROD
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2AZ-FE ENGINE CONTROL SYSTEM – SFI SYSTEM

Battery
To Battery
STP
ST1-
E1
E01
E04
E03
IAC+*1
IAC-*1
W
MIL
ETCS
IMRV (Intake Manifold
Runner Valve) Motor
+BM
ALT
Generator
DLC3
TC
FC
TACH
Fuel Pump
ECM
BATT
+B
+B2
MREL
PRG
IGSW

ETHW
To
INJ
HA1A
A1A+
A1A-
HT1B
OX1B
EX1B
KNK1
EKNK
M+
M-
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Crankshaft Position Sensor
Camshaft Position Sensor
Throttle Position
Sensor
IMRV Position
Sensor
Camshaft Timing Oil Control Valve
No. 1 Ignition Coil
No. 2 Ignition Coil
No. 3 Ignition Coil
No. 4 Ignition Coil
Park/Neutral
Position SW or

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M
M
M
Combination Meter
Transponder Key ECU
Accelerator Pedal Position Sensor
FAN No. 3
FAN No. 2
FAN No. 1
A/C Condenser
Fan Motor
To Battery
To Battery
Radiator Fan Motor
Canister Pump Module
Vent Valve
Canister Pressure
Sensor
To EFI No. 3
Leak Detection Pump
PS Oil Pressure SW
ECM
SPD
FANL
IMO
IMI
VCP2

NEXT
HINT:
If the display indicates a communication fault in the tester,
inspect the DLC3.
NEXT
HINT:
Record or print DTCs and freeze frame data, if necessary.
NEXT
NEXT
NEXT
NEXT
1
VEHICLE BROUGHT TO WORKSHOP
2
CUSTOMER PROBLEM ANALYSIS
3
CONNECT INTELLIGENT TESTER TO DLC3*
4
CHECK FOR DTC AND FREEZE FRAME DATA*
5
CLEAR DTC AND FREEZE FRAME DATA*
6
CONDUCT VISUAL INSPECTION
7
SET CHECK MODE DIAGNOSIS*
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HINT:
If the engine does not start, first perform the "CHECK DTC"

CONDUCT BASIC INSPECTION
Result Proceed to
Malfunctioning parts not confirmed A
Malfunctioning parts confirmed B
GO TO STEP 17
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A
Result
B
A
NEXT
Result
B
A
NEXT
NEXT
NEXT
13
REFER TO PROBLEM SYMPTOMS TABLE
Result Proceed to
Malfunctioning circuit confirmed A
Malfunctioning parts confirmed B
GO TO STEP 17
14
CHECK ECM POWER SOURCE CIRCUIT
15
CONDUCT CIRCUIT INSPECTION
Result Proceed to

than normal mode (default), which uses 2 trip detection logic.
1. Clear the DTCs (See page ES-38).
2. Switch the ECM from normal mode to check mode using
the intelligent tester (See page ES-41).
3. Perform a simulation test.
4. Check and wiggle the harness(es), connector(s) and
terminal(s).
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BASIC INSPECTION
When a malfunction is not confirmed by the DTC check,
troubleshooting should be carried out in all circuits
considered to be possible causes of the problem. In many
cases, by carrying out the basic engine check shown in the
following flowchart, the location of the problem can be found
quickly and efficiently. Therefore, using this check is essential
when engine troubleshooting.
NOTICE:
Conduct this check with the engine stopped and ignition
switch off.
Result
NG
OK
NG
OK
NG
OK
(a) Visually check that the air filter is not excessively
contaminated with dirt or oil.

OK
6
CHECK FUEL PRESSURE
TROUBLESHOOT FUEL PRESSURE AND
PROCEED TO NEXT STEP
7
CHECK FOR SPARKS
TROUBLESHOOT SPARK AND PROCEED
TO NEXT STEP
PROCEED TO PROBLEM SYMPTOMS TABLE
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REGISTRATION
NOTICE:
The Vehicle Identification Number (VIN) must be input
into the replacement ECM.
HINT:
The VIN is a 17-digit alphanumeric number. The intelligent
tester is required to register the VIN.
1. DESCRIPTION
This registration section consists of 3 parts: Input
Instructions, Read VIN and Write VIN.
(a) Input Instructions: Explains the general VIN input
instructions when using the intelligent tester.
(b) Read VIN: Explains the VIN reading process in a
flowchart. This process allows the VIN stored in the
ECM to be read in order to confirm that the two
VINs, provided with the vehicle and stored in the
vehicle's ECM, are the same.

UP/DOWN buttons, or the numerical buttons.
(f) Finishing Input Operation
(1) Make sure that the input VIN matches the
vehicle VIN after input.
(2) Press the ENTER button on the tester.
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3. READ VIN
(a) Confirm the vehicle VIN.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Turn the tester on.
(e) Select the following menu items: DIAGNOSIS /
ENHANCED OBD II/ VIN.
4. WRITE VIN
(a) Confirm the vehicle VIN.
(b) Connect the intelligent tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Turn the tester on.
Menu Screen:
Select VIN READ
DTC P0630 Set
VIN Previously Stored
VIN Not Stored
[EXIT]
[EXIT]
[EXIT]
To Menu Screen
17-digit VIN

Input Instructions
[ENTER]
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Writing Successful Writing Error Communication Error
To Menu Screen To Menu Screen To Menu Screen
[ENTER] [EXIT] [EXIT]
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CHECKING MONITOR STATUS
The purpose of the monitor result (mode 06) is to allow
access to the results of on-board diagnostic monitoring tests
of specific components/systems that are not continuously
monitored. Examples are catalysts and evaporative
emissions (EVAP).
The monitor result allows the OBD II scan tool to display the
monitor status, test value, minimum test limit and maximum
test limit. These data are displayed after the vehicle has been
driven to run the monitor.
When the test value is not between the minimum test limit
and maximum test limit, the ECM (PCM) interprets this as a
malfunction. If the test value is on the borderline of the test
limits, the component is likely to malfunction in the near
future.
Perform the following instructions to view the monitor status.
Although this instruction refers to the Lexus/Toyota diagnostic

(MIN LIMIT) and maximum test limit (MAX LIMIT).
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(b) If the test value is between the minimum test limits
and maximum test limits, the component is
functioning normally. If not, the component is
malfunctioning. The test value is usually not near
the test limit. If the test value is on the borderline of
the test limits, the component is likely to malfunction
in the near future.
HINT:
The monitor result might be PASS on rare
occasions even if the malfunction indicator lamp
(MIL) is illuminated. This indicates the system
malfunctioned on a previous driving cycle. This
might be caused by an intermittent problem.
4. MONITOR RESULT INFORMATION
If you use a generic scan tool, multiply the test value by
the scaling value listed below.
A/F Sensor (Sensor 1):
HO2 Sensor (Sensor 2):
Catalyst:
EVAP:
Rear Oxygen Sensor Heater:
Monitor ID Test ID Scaling Unit Description
$01 $8E Multiply by 0.001 V A/F sensor deterioration level
$01 $91 Multiply by 0.004 mA A/F sensor current
Monitor ID Test ID Scaling Unit Description
$02 $07 Multiply by 0.001 V Minimum sensor voltage