2005 TOYOTA AVENSIS diagnostic

D30688
ECM
MPX2
MPX1 29
18 E10 11
B8
22 SNOWI14
Integration Relay
8
Driver Side J/B14
DA B E8
ECT Pattern Select SW
*1: RHD
*2: LHD 4 1 W±B
CH
CF
CA 8
11
6
W±B
IPE10 MPX1
MPX2
*1
*2
B8
(*3) Pattern Select Switch (ECT SNOW Switch)
When the ECT SNOW switch is pushed, the switch contact is made and the ECT SNOW mode is selected.
To cancel the ECT SNOW mode, push the ECT SNOW switch once again. The ECT SNOW mode is automatical-
ly cancelledout when the ignition switch is turned ºOFFº.
*3
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))05±977
AVENSIS REPAIR MANUAL (RM1018E)
PATTERN SELECT SWITCH CIRCUIT
CIRCUIT DESCRIPTION
ECT SNOW is the system that operates the throttle motor to control engine output to reduce skidding of the
driving wheels, guarantee takeoff acceleration, driving straightness and turning stability.
WIRING DIAGRAM
05C9L±01

B59192
Wire Harness Side:
D30685
Switch Side:
05±978± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 DRIVING TEST
(a) Start the engine.
(b) Turn the ECT SNOW switch ºOFFº.
(c) Confirm vehicle response by driving from a parked position to fully depressing the accelerator pedal.
(d) Turn the ECT SNOW switch on and perform the same check as (c).
Confirm that there is a difference between ECT SNOW switch ºONº and ºOFFº.
HINT:

Driving test should be done on a paved road (a nonskid road).

Make sure not to use the TRAC system when testing a vehicle equipped with one.
Standard:
There is a difference in acceleration between ºONº and ºOFFº.
NG Go to step 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE
(See page xx±xxx)
2 CHECK HARNESS AND CONNECTOR(PATTERN SELECT SWITCH ASSY ± BODY
GROUND)
(a) Disconnect the connector of pattern select switch (ECT
SNOW switch).
(b) Measure the resistance between 4 of the wire harness
connector and body ground.
Standard:
Tester connectionSpecified condition
4 ± Body groundBelow 1

NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
3 INSPECT PATTERN SELECT SWITCH ASSY
(a) Measure the resistance between terminals 1 and 4 of pat-
tern select switch (ECT SNOW switch).
Standard:
Switch conditionTester connectionSpecified condition
Press continuously
Pattern select switch1 ± 4Continuity
Release
Pattern select switch1 ± 4No continuity
NG REPLACE PATTERN SELECT SWITCH ASSY
OK

D30751
Instrument Panel J/B Assy
Vehicle Front Side:
DA
DA
SNOW
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))05±979
AVENSIS REPAIR MANUAL (RM1018E)
4 CHECK HARNESS AND CONNECTOR(PATTERN SELECT SWITCH ASSY ±
INTEGRATION RELAY)
(a) Connect the connector of pattern select switch (ECT
SNOW switch).
(b) Disconnect the instrument panel J/B assy (integration
relay) connector.
(c) Measure the resistance between terminal SNOW of
instrument panel J/B assy (integration relay) and body
ground.
Standard:
Switch conditionTester connectionSpecified condition
Press continuously
Pattern select switchDA±14 (SNOW) ± Body
groundBelow 1

Release
Pattern select switchDA±14 (SNOW) ± Body
ground10 k
or higher
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE
(See page xx±xxx)

05±972± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))
AVENSIS REPAIR MANUAL (RM1018E)
TRANSMISSION CONTROL SWITCH CIRCUIT
CIRCUIT DESCRIPTION
When shifting the shift lever into S position using the transmission control switch, it is possible to shift in 1
to 4 positions.
Shifting º+º once changes up 1 shift range position, º±º once changes down 1 shift range position respective-
ly.
05C9K±01

D30750
ECM
SPT1
SFTD
SFTU L
B
R20
21
22 E10
7
1
2
5J17
J/C
W±B(*1)
(*2) A
A S
SFTD
SFTU
E SCT 3 R±WT7
Transmission Control SW
Center J/B
Driver Side J/B
I13
Ignition SW
Engine Room J/B No.4
FL MAIN
Battery
*1: LHD
*2 RHDIJIK IPJ15
J/C A AM1 IG1R±W
W±B B±G
G±Y7
1
CA
7
DB
9
DA
1
DH AM1 GAUGE1 IG1 Relay
5
13
2 DN
31
1
4D1
4B ALT
21E10
E10
W±B
W±B
CG
R±W 1
5
DH
G±R
G±Y
W±B
B±G R±W
B±G
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))05±973
AVENSIS REPAIR MANUAL (RM1018E)
WIRING DIAGRAM

D30684
SPT1 E1
D30684
SFTU
SFTD E1
H42585
SFTD (+)
E (±) SFTU (+)
05±974± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 CHECK ECM
(a) Turn the ignition switch to ON.
(b) Measure the voltage between terminals SPT1 and E1 of
the ECM.
OK:
Shift rangeSpecified condition
Except S positionBelow 1 V
S position7.5 to 14 V
NG Go to step 6
OK
2 CHECK ECM
(a) Measure the voltage between terminals E1 and that
SFTU as well as SFTD of the ECM.
OK:
Shift rangeTester connectionSpecified condition
Shift to º+º
(Up shift)SFTU ± E1Below 1.5 V
S positionSFTU ± E17.5 to 14 V
Shift to º±º
(Down shift)SFTD ± E1Below 1.5 V
S positionSFTD ± E17.5 to 14 V
OK NORMAL
NG
3 INSPECT SHIFT LOCK CONTROL UNIT ASSY(TRANSMISSION CONTROL
SWITCH)
(a) Turn the ignition switch to OFF.
(b) Disconnect the transmission control switch connector.
(c) Measure the resistance between terminals E and SFTU
as well as SFTD of the transmission control switch con-
nector.
OK:
Shift rangeTester connectionSpecified condition
Shift to º+º
(Up shift)SFTU ± EContinuity
S positionSFTU ± ENo continuity
Shift to º±º
(Down shift)SFTD ± EContinuity
S positionSFTD ± ENo continuity
NG REPLACE SHIFT LOCK CONTROL UNIT ASSY
OK

 
H42967
SFTUSFTD
SFTD
SFTU
E11
A
± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))05±975
AVENSIS REPAIR MANUAL (RM1018E)
4 CHECK HARNESS AND CONNECTOR(ECM ± TRANSMISSION CONTROL
SWITCH)
(a) Disconnect the ECM connector.
(b) Check the continuity between ECM and transmission
control switch.
OK:
Tester connectionSpecified condition
SFTU (E11±22) ± SFTU (A±2)Continuity
SFTD (E11±21) ± SFTD (A±1)Continuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
5 CHECK HARNESS AND CONNECTOR(TRANSMISSION COTROL SWITCH ± BODY
GROUND)
(a) Check the continuity between body ground and E of the transmission control switch connector (wire
harness side).
OK:
Continuity
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM

H42585
IG
S

C91567
E1 (±)
SPT1 (+)
05±976± DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U241E(1AZ±FSE))
AVENSIS REPAIR MANUAL (RM1018E)
6 INSPECT SHIFT LOCK CONTROL UNIT ASSY(TRANSMISSION CONTROL
SWITCH)
(a) Turn the ignition switch to OFF.
(b) Disconnect the transmission control switch connector.
(c) Check the continuity between terminal IG and S of the
transmission control switch.
OK:
Shift rangeTester connectionSpecified condition
Except S positionIG ± SNo continuity
S positionIG ± SContinuity
NG REPLACE SHIFT LOCK CONTROL UNIT ASSY
OK
7 CHECK HARNESS AND CONNECTOR
(a) Connect the transmission control switch connector.
(b) Disconnect the ECM connector.
(c) Turn the ignition switch to ON.
(d) Measure the voltage between terminal SPT1 and E1 of
the ECM connector.
OK:
Shift rangeTester connectionSpecified condition
Except S positionSPT1 ± E1Below 1 V
S positionSPT1 ± E17.5 to 14 V
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR
OK
CHECK AND REPLACE ECM