2005 TOYOTA AVENSIS diagnostic

05CDS±01
05±290
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
SFI SYSTEM(1AZ±FSE)
HOW TO PROCEED WITH TROUBLESHOOTING
1VEHICLE BROUGHT TO WORKSHOP
2CUSTOMER PROBLEM ANALYSIS (See page 05±293)
3 CONNECT THE HAND±HELD TESTER TO DLC3
HINT:
If the display indicates a communication fault in the tool, inspect the DL\
C3.
4CHECK DTC AND FREEZE FRAME DATA(See page 05±294)
HINT:
Record or print DTC and freeze frame data, if needed.
5CLEAR DTC AND FREEZE FRAME DATA (See page 05±294)
6 VISUAL INSPECTION
7SETTING THE CHECK (TEST) MODE DIAGNOSIS (See page 05±294)
8 PROBLEM SYMPTOM CONFIRMATION
HINT:
If the engine does not start, perform steps 10 and 12 first.
AMalfunction does not occur
BMalfunction occurs
B GO TO STEP 10
A

±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
05±291
AVENSIS REPAIR MANUAL (RM1018E)
9SYMPTOM SIMULATION
10DTC CHECK (See page 05±294)
AMalfunction code
BNo code
B GO TO STEP 12
A
11DTC CHART (See page 05±309)
GO TO STEP 14
12BASIC INSPECTION (See page 05±294)
AWrong parts not confirmed
BWrong parts confirmed
B GO TO STEP 17
A
13PROBLEM SYMPTOMS TABLE (See page 05±320)
AWrong circuit confirmed
BWrong parts confirmed
B GO TO STEP 17
A
14CHECK ECM POWER SOURCE CIRCUIT (See page 05±502)
15 CIRCUIT INSPECTION
AMalfunction not confirmed
BMalfunction confirmed
B GO TO STEP 18
A

05±292
±
DIAGNOSTICS SFI SYSTEM(1AZ±FSE)
AVENSIS REPAIR MANUAL (RM1018E)
16CHECK FOR INTERMITTENT PROBLEMS (See page 05±294)
GO TO STEP 18
17 PARTS INSPECTION
18 IDENTIFICATION OF PROBLEM
19 ADJUSTMENT, REPAIR
20 CONFIRMATION TEST
END

A76892
V3
Variable Resister
VCC 2
VA F 3
E2
1R±W
P
BR10
EA13
EA19
EA1ECM
5V
VC
VA F
E1
E2 R±W
P
BRE1318
32
E13
28
E13 05±286
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
VARIABLE RESISTOR CIRCUIT
CIRCUIT DESCRIPTION
The variable resister has been adopted to leaded±type vehicle only.
This resistor is used change the air±fuel ratio of the air±fuel mixture.
The idle mixture is adjusted using this resistor.
Turning the idle mixture adjusting screw clockwise moves the contacts inside the resistor, raising the terminal
VAF voltage. Conversely, turning the screw counterclockwise lowers the terminal VAF voltage.
When the terminal VAF voltage rises, the ECM increases the injection volume slightly, marking the air±fuel
mixture a little richer.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
Always use a CO meter when adjusting the idle mixture. If a CO meter is not available, DO NOT AT-
TEMPT TO ADJUST IDLE MIXTURE.
05C7E±01

A73579
Idle Mixture
Adjusting
ScrewSST
180
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±287
AVENSIS REPAIR MANUAL (RM1018E)
1CHECK CO/HC (See page 14±101)
OKCHECK FOR PROBLEM SYMPTOMS TABLE
(See page 05±168)
NG
2ADJUST CO CONCENTRATION
SST09243±00020 (a)Same condition as step 1 this chart.
(b)Using SST, adjusting the idle mixture by turning the idlemixture adjusting screw in the variable resistor.
Result:
ResultProceed
Connection: 1.5
0.5 %B
Change in CO connectionC
No change in CO connectionA
HINT:

Always check idle speed after turning the idle mixture ad-
justing screw. If it is incorrect, readjust idle speed.

Adjustable range of the idle mixture adjust to turn this
screw is 180 degrees. Do not turn this screw more than
it.
BADJUSTMENT COMPLETE
CCHECK CO/HC (See page 14±101)
A

1
2
31
2
3
A74545
SST
V3
A79116
SST
ECM Connector
VAFE2
E13
05±288
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
3INSPECT VARIABLE RESISTOR
SST09243±00020 (a)Measure the resistance between the terminals.
Resistance:
Symbols (Terminal No.)Specified condition
1 ± 23.5 ± 6.5 
(b)Measure the resistance between terminals 2 and 3 when
turning the idle mixture adjusting screw fully clockwise
and counterclockwise using SST
Resistance:
Symbols (Terminal No.)Specified condition
2 ± 3Change from about 5 k  to 0 k accord-
ingly
NGREPLACE VARIABLE RESISTOR
OK
4CHECK ECM
SST09243±00020 (a)Turn the ignition switch ON.
(b)Measure the voltage between the terminals of the E13ECM connector while slowly turning the idle mixture ad-
justing screw first fully counterclockwise and then fully
clockwise, using SST.
Voltage:
Symbols (Terminal No.)Specified condition
VAF (E13±32) ± E2 (E13±28)
Voltage changes smoothly from 0 V to
about 5 V, i.e. does not suddenly jump
up to 5 V down to 0 V
OKCHECK AND REPLACE ECM (See page 01±32)
NG

A73587
Wire Harness SideVariable Resistor Connector
E2VCVAF
V3
A65743ECM Connector
VAFE2
E13
VC
±
DIAGNOSTICS SFI SYSTEM(1AZ±FE)
05±289
AVENSIS REPAIR MANUAL (RM1018E)
5CHECK HARNESS AND CONNECTOR(ECM ± VARIABLE RESISTOR)
(a)Disconnect the V3 variable resistor connector.
(b)Disconnect the E13 ECM connector.
(c)Check for continuity between the wire harness side con-
nectors.
Standard (Check for open):
Symbols (Terminal No.)Specified condition
VC (V3±2) ± VC (E13±18)
VAF (V3±3) ± VAF (E13±32)Continuity
E2 (V3±1) ± E2 (E13±28)
y
Standard (Check for short):
Symbols (Terminal No.)Specified condition
VC (V3±2) or VC (E13±18) ± Body groundNocontinuityVAF (V3±3) or VAF (E13±32) ± Body groundNo continuity
NGREPAIR OR REPLACE HARNESS OR CONNECTOR
OK
CHECK AND REPLACE ECM (See page 01±32)

A76890
4 D5
DLC3
CGTC13
W±BCBW±L20
E9TCECM
W±L
W±B J8
J/C
BB
J16
J/C A
IP IOCenter J/B
CA 36
A(RHD) W±B
(RHD)
(LHD)W±B
(LHD) (LHD)W±L
(LHD)
W±L
(RHD)DB
DC 17 3Driver Side J/B
3 2 1 45678
9 1 0 111 21 31 41 51 6
DLC3
A04550
CG (±)TC (+)
DLC3
05±284
± DIAGNOSTICSSFI SYSTEM (1AZ±FE)
AVENSIS REPAIR MANUAL (RM1018E)
TC TERMINAL CIRCUIT
CIRCUIT DESCRIPTION
Terminals TC and CG are located in the DLC3. When connecting these terminals, DTCs in normal mode or
check mode can be read through the CHK ENG flashing in the combination meter.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

Even though terminal TC is not connected to terminal CG, the CHK ENG blinks.

For the above phenomenon, an open or short in the wire harness, or malfunction inside the ECM is
the likely cause.
1 CHECK DLC3(TC VOLTAGE)
(a) Turn the ignition switch ON.
(b) Measure the voltage between the terminals of the DLC3.
Standard:
Symbols (Terminal No.)Specified condition
TC (13) ± CG (4)9 to 14 V
OK Go to step 3
NG
05C7D±01