2001 TOYOTA AVALON Service Repair Manual

DI4DE-02
A02016
E6 E8E7
31 30 29 28 2717
19 20 21
22 23 24 25 2611 12
13 141 2 3 4 5 6 7 8 9
10
ECM Terminals
15 16
181 2 3 4 5 6 7
8 9 10 11 12 13 14 15 16
188
20 21 22 23 2417
191 2 3 4 5 6
7 9 10 11 12
13 14 15 16 171 2 3 4 5 6 7 8 9
10 12 11 13 14 15 16 17 18 19
20 21 23 22 24 26 25 27
281 2 3 4 5 6 7
8 9 10 11 12 13 14 15
16 17 18 19 20 21 22
E5 E4 DI-20
- DIAGNOSTICSENGINE
176 Author
: Date
:
2001 AVALON (RM808U)
TERMINALS OF ECM
Symbols (Terminal No.)Wiring ColorConditionSTD Voltage (V)
BATT (E8-1) - E1 (E5-17)B-R eBRAlways9 - 14
+B (E8-16) - E1 (E5-17)B-W e BRIG switch ON9 - 14
VC (E5-2) - E2 (E5-18)L-R e WIG switch ON4.5 - 5.5
VTA1 (E5 23) E2 (E5 18)LGWIG switch ON, Throttle valve fully closed0.3 - 1.0VTA1 (E5-23) - E2 (E5-18)LGe WIG switch ON, Throttle valve fully open2.7 - 5.2
VG (E5-10) - E2G (E5-19)R eR-BIdling, A/C switch OFF1.1 - 1.5
VV1+ (E4-10)
- NE- (E5-24)B-W eL
IdliPulse generation
VV2+ (E4-22)
- NE- (E5-24)B-W eL
IdlingPulse generation
(See page DI-124)
NE+ (E5-16) - NE- (E5-24)B-W eLIdlingPulse generation
(See page DI-124)
OC1+ (E4-6) - OC1- (E4-5)R-B e RPl tiOC2+ (E4-29)
- OC2- (E4-18)R-L eR-WIG switch ONPulse generation
(See page DI-127)
THA (E5-22) - E2 (E5-18)L-B eWIdling, Intake air temp. 20°C (68°F)0.5 - 3.4
THW (E5-14) - E2 (E5-18)G-Y eWIdling, Engine coolant temp. 80°C (176°F)0.2 - 1.0
STA (E8-7) - E1 (E5-17)B-R e BRCranking6.0 or more
#10 (E5-5) - E01 (E4-21)
#20 (E5-6) - E01 (E4-21)
#30 (E4 1) E01 (E4 21)
L eW-B
R eW-B
YWB
IG switch ON9 - 14
#30 (E4-1) - E01 (E4-21)
#40 (E4-2) - E01 (E4-21)
#50 (E4-3) - E01 (E4-21)
#60 (E4-4) - E01 (E4-21)Y eW-B
W eW-B
G eW-B
G eW-B
IdlingPulse generation
(See page DI-58)
IGT1 (E4-11) - E1 (E5-17)GR eBR
IGT2 (E4-12) - E1 (E5-17)B-R eBR
IGT3 (E4-13) - E1 (E5-17)LG-B eBRIdliPulse generation
IGT4 (E4-14) - E1 (E5-17)L-Y eBRIdlingPulse generation
(See page DI-1 17)
IGT5 (E4-15) - E1 (E5-17)L eBR
(g )
IGT6 (E4-16) - E1 (E5-17)LG eBR
IG switch ON4.5 - 5.5
IGF (E4-25) - E1 (E5-17)B-Y eBRIdlingPulse generation
(See page DI-1 17)
ACIS (E8-17) - E01 (E4-21)R-Y eW-BIG it h ON914ACI1 (E5-15) - E01 (E4-21)W-R eW-BIG switch ON9 - 14
FC (E8 3) E01 (E4 21)GBWBIG switch ON9 - 14FC (E8-3) - E01 (E4-21)G-B eW-BIdling0 - 3.0

- DIAGNOSTICSENGINE
DI-21
177 Author
: Date
:
2001 AVALON (RM808U) EVP1 (E5-7) - E01 (E4-21)
B-R eW-BIG switch ON9 - 14
CCV (E8-10) - E01 (E4-21)G eW-BIG switch ON9 - 14
RSO (E4-26) - E01 (E4-21)G-B eW-BIG switch ON, Disconnect E11 connector from ECM9 - 14
OXS (E7-8) - E1 (E5-17)B eBRMaintain engine speed at 2,500 rpm for 3 min. after warming upPulse generation
(See page DI-71)
HTS (E7 9) E03 (E4 30)LGWBIdlingBelow 3.0HTS (E7-9) - E03 (E4- 30)LG eW-BIG switch ON9 - 14
KNKR (E4-27) - E1 (E5-17)W eBRIdliPulse generation
KNKL (E4-28) - E1 (E5-17)W eBRIdlingPulse generation
(See page DI-64)
NSW (E7 20) E1 (E5 17)BWBRIG switch ON, Other shift position in P, N9 - 14NSW (E7-20) - E1 (E5-17)B-W eBRIG switch ON, Shift position in P, N0
TACH (E7-27) - E1 (E5-17)B eBRIdlingPulse generation
TBP (E7-3) - E01 (E4-21)P-B eW-BIG switch ON, Disconnect vacuum hose from vapor pressure
sensor9 - 14
PTNK (E8 17) E2 (E5 18)PWIG switch ON2.9 - 3.7PTNK (E8-17) - E2 (E5-18)P eWIG switch ON, Apply vacuum 4.0 kPa (30 mmHg, 1.18 in.Hg)0.5 or less
SIL (E8-4) - E1 (E5-17)W eBRDuring transmissionPulse generation
STP (E8 15) E1 (E5 17)GWBRIG switch ON, Brake pedal depressed7.5 - 14STP (E8-15) - E1 (E5-17)G-W eBRIG switch ON, Brake pedal releasedBelow 1.5
AFR+ (E5-11) - E1 (E5-17)B-R eBRIG it h ON30 36AFL+ (E5-12) - E1 (E5-17)B-W eBRIG switch ON3.0 - 3.6
AFR- (E5-20) - E1 (E5-17)BR eBRIG it h ON27 33AFL- (E5-21) - E1 (E5-17)L eBRIG switch ON2.7 - 3.3
HAFR (E5-3) - E04 (E5-1)B-R eW-BIdlingBelow 3.0HAFR (E5 3) E04 (E5 1)
HAFL (E5-4) - E05 (E5-8)
BR eWB
B-R eW-BIG switch ON9 - 14
KSW (E7 23) E1 (E5 17)RYBRAt time of inserting keyBelow 1.5KSW (E7-23) - E1 (E5-17)R-Y eBRIn condition without key inserted4 - 5
CODE (E7-28) - E1 (E5-17)P-G eBRAt time of inserting keyPulse generation
IGSW (E8-2) - E1 (E5-17)B-O eBRIG switch ON9 - 14
TXCT (E7-18) - E1 (E5-17)L-Y eBRAt time of inserting keyPulse generation
IMLD (E8-22) - E1 (E5-17)V-W eBRIn condition without key insertedPulse generation
MREL (E8-8) - E1 (E5-17)L-O eBRIG switch ON9 - 14

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.

I11736
Transponder Key
Amplifier
18
E7
E719
28
E7
CODERXCK TXCT
CODE RXCKTXCT
L-Y
L-O
P-G 4
3
2ECM
T6 DI-606
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
762 Author
: Date
:
2001 AVALON (RM808U)
DTC B2796/99 No Communication in Immobiliser system
CIRCUIT DESCRIPTION
This code is stored in memory when inserting the key that does not have a transponder chip or if communica-
tion between the key and ECM is impossible.
DTC No.DTC Detecting ConditionTrouble Area
B2796/99No communication

Key

Transponder Key Coil

Transponder Key Amplifier

Wire harness

ECM
WIRING DIAGRAM
DI1AT-23

- 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-608
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
764 Author
: Date
:
2001 AVALON (RM808U)
4 Does it operate normally after replacement of transponder key amplifier?
Yes Replace transponder key amplifier.
No
Replace ECM.

I11736
Transponder Key
Amplifier
18
E7
E719
28
E7CODERXCK TXCT
CODE RXCKTXCT
L-Y
L-O
P-G 4
3
2ECM
T6
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
DI-609
765 Author
: Date
:
2001 AVALON (RM808U)
DTC B2797/99 Communication Malfunction No.1
CIRCUIT DESCRIPTION
This code is detected when although the communication has been performed normally, an error occurs.
(Example. Some noise is included in communication line.)
DTC No.DTC Detecting ConditionTrouble Area
B2797/99Communication error

Wire Harness

Transponder Key Amplifier

ECM
WIRING DIAGRAM
DI6LC-01

I02681
Noise
DI-610
- DIAGNOSTICSENGINE IMMOBILISER SYSTEM
766 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Noise check
PREPARATION:
Insert the already registered master key in the key cylinder.
CHECK:
Using an oscilloscope or hand-held tester, check that noise is
included in the signals sent to the CODE terminal of Engine and
ECT ECU.
OK:
No noise is detected.
NG Try to find the cause of the noise and remove it.
OK
2 Does the system operate normally after replacement of transponder key amplifi-
er?
Yes Replace transponder key amplifier.
No
Replace ECM.