2005 TOYOTA AVENSIS check engine light

05JL4−01
05 −534−
DIAGNOSTICS ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U 151E)
AVENSIS Supplement (RM 1045E)
ROAD TEST
1. PROBLEM SYMPTOM CONFIRMATION
(a) Based on the result of the customer problem analysis, try to reproduce the symptoms. If the problem
is that the transaxle does not shift up, shift down, or the shift point is too high or too low, conduct the
following road test referring to the automatic shift schedule and simulate the problem symptoms.
2. ROAD TEST
NOTICE:
Perform the test at the ATF (Automatic Transmission Fluid) temperature 50 to 80 ˚C( 122 to 176 ˚F) in
the normal operation.
(a) D position test: Shift into the D position and fully depress the accelerator pedal and check the following points.
(1 ) Check up −shift operation.
Check that 1
2, 2
3, 3
4 and 4
5th up −shifts take place, and that the shift points conform
to the automatic shift schedule (see page 03 −33).
HINT:
5th Gear Up −shift Prohibition Control
S ATF temperature is −2 ˚C (28 ˚F ) or less.
5th and 4th Gear Lock −up Prohibition Control
S Brake pedal is depressed.
S Accelerator pedal is released.
S Engine coolant temperature is 60 ˚C( 140 ˚F) or less.
(2) Check for shift shock and slip. Check for shock and slip at the 1
2, 2
3, 3
4 and 4
5th up −shifts.
(3) Check for abnormal noise and vibration. Check for abnormal noise and vibration when up −shifting from 1
2, 2
3, 3
4 and 4
5
while driving with the shift lever in the D position, and check while driving in the lock −up condition.
HINT:
The check for the cause of abnormal noise and vibration must be done thoroughly as it could also be due
to loss of balance in the differential, torque converter clutch, etc.
(4) Check kick −down operation.
Check vehicle speeds when the 2nd to 1st, 3rd to 2nd, 4th to 3rd, and 5th to 4th kick −downs take
place while driving with the shift lever in the D position. Confirm that each speed is within the
applicable vehicle speed range indicated in the automatic shift schedule (see page 03 −33).
(5) Check for abnormal shock and slip at kick −down.
(6) Check the lock −up mechanism.
SDrive in D position (5th gear), at a steady speed (lock −up ON).
SLightly depress the accelerator pedal and check that the engine speed does not change
abruptly.
HINT:
SThere is no lock −up function in the 1st, 2nd and 3rd gear.
S4th lock −up operates while uphill −downhill control is active in the D position.
SIf there is a big jump in engine speed, there is no lock −up.

− DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E)05−535
AVENSIS Supplement (RM1045E)
(b) S position test
Shift to the S position, depress the accelerator pedal and check the following points:
(1) Check shift operation.
SWhile driving in the D position and 5th gear, shift into the S position and back to the D posi-
tion. Check that the gear change 5
4 down−shift and 4
5up−shift can be performed.
SWith the shift lever in the S position (while the vehicle is stopped), shift into the ”+” position
to check that the shift position on the combination meter changes as follows:1
2, 2

3, 3
4 and 4
5.
SWhile driving in the 4(S) position and 4th gear (at a vehicle speed of approximately 40 to
50 km/h (25 to 31mph)), shift into the ”−” position and check if the 3rd gear down−shift oc-
curs and the engine brake performs properly.
SWhile driving in the 3(S) position and 3rd gear (at a vehicle speed of approximately 30 to
40 km/h (19 to 25 mph)), shift into the ”−” position and check if the 2nd gear down−shift
occurs and the engine brake performs properly.
SWhile driving in the 2(S) position and 2nd gear (at a vehicle speed of approximately 20 to
30 km/h (12to19 mph)), shift into the ”−” position and check if the1st gear down−shift oc-
curs and the engine brake performs properly.
HINT:
Manual shift (S position) is prohibited under either of the following conditions:
SDown−shifting may cause engine overrun.
SThe driver continuously down−shifts. (Down−shifting to1st gear may not be performed.)
(c) R position test:
Shift into the R position, lightly depress the accelerator pedal, and check that the vehicle moves back-
ward without any abnormal noise or vibration.
CAUTION:
Before conducting this test ensure that the test area is free from people and obstruction.
(d) P position test:
Stop the vehicle on a grade (more than 5˚) and after shifting into the P position, release the parking
brake. Then, check that the parking lock pawl holds the vehicle in place.
(e) Uphill/downhill control function test:
(1) Check that the gear does not up−shift to the 4th or 5th gear while the vehicle is driving uphill.
(2) Check that the gear automatically down−shifts from the 5th to 4th or from the 4th to 3rd gear when
brake is applied while the vehicle is driving downhill.

A81015
Engine
Room
R/B No. 1W
9ECM
W
E912
1 2
B
B−W22 1
3
Battery4
2 DH 6
B−R B−R
C11
Combination
Meter Assy
Check
Engine
Warning
Light AM2
IG2
AM2
Driver
Side
J/B
FL MAINEngine
Room
R/B
No. 3
3B 1A 1B−R
IE41
(LHD)IP11
(RHD)
18 DA
J8C
(LHD)J26A
(RHD)J8C
(LHD)J26A
(RHD) J/CB−W IGNI13
Ignition
Switch
− DIAGNOSTICSECD SYSTEM (1CD−FTV)(From September, 2003)
05−497
AVENSIS Supplement (RM1045E)
CHECK ENGINE WARNING LIGHT CIRCUIT
CIRCUIT DESCRIPTION
If the ECM detects a trouble, the CHK ENG is illuminated. At this time, the ECM records the DTC in its
memory.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Troubleshoot each trouble symptom in accordance with the chart below .
Reference:
ResultProceed to
CHK ENG remains onStart inspection from step 1
CHK ENG is not illuminatedStart inspection from step 3
05B62−07

A65748ECM ConnectorE9
05
−498
−
DIAGNOSTICS ECD SYSTEM (1CD−FTV)(From September, 2003)
AVENSIS Supplement (RM1045E)
1 CLEAR DTC
(a) Connect the hand −held tester to the DLC 3.
(b) Turn the ignition switch to ON and turn the hand −held tester ON.
(c) Select the item ”DIAGNOSIS / OBD/MOBD / DTC INFO / CURRENT CODES”.
(d) Read DTCs.
(e) Select the item ”DIAGNOSIS / OBD/MOBD / DTC INFO / CLEAR CODES”.
(f) Clear the DTCs.
(g) Check that the CHK ENG is not illuminated. Standard: CHK ENG is not illuminated.
OK REPAIR CIRCUIT INDICATED BY OUTPUT DTC(See page 05 −299)
NG
2 CHECK HARNESS AND CONNECTOR(CHECK FOR SHORT IN WIRE HARNESS)
(a) Disconnect the E9 ECM connector.
(b) Turn the ignition switch to ON.
(c) Check that the CHK ENG is not illuminated. Standard: CHK ENG is not illuminated.
(d) Reconnect the ECM connector.
OK REPLACE ECM (See page 10− 29)
NG
CHECK AND REPAIR HARNESS AND CONNECTOR
3 CHECK CHK ENG CONDITION
(a) Check that the CHK ENG is illuminated when the ignition switch is turned to ON. Standard: CHK ENG is illuminated.
OK SYSTEM OK
NG
4 INSPECT COMBINATION METER ASSY(CHECK ENGINE WARNING LIGHT CIRCUIT)
NG REPAIR OR REPLACE BULB OR COMBINATION
METER ASSEMBLY
OK
CHECK AND REPAIR HARNESS AND CONNECTOR (COMBINATION METER −ECM)

A87894
AF− AF+
A34
Front View
Component Side
(w/ Headlight Beam Level Control):
1
2
3
4
HT
+B
A/F Sensor
Connector
A87894
AF−
AF+
A34
Front View
HT +B
1
2
3
4
Component Side
(w/o Headlight Beam Level Control):
A/F Sensor
Connector
−
DIAGNOSTICS ECD SYSTEM (1CD −FTV)(From September, 2003)
05 −485
AVENSIS Supplement (RM 1045E)
INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand−held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air −fuel ratio was lean or rich, and other data
from the time the malfunction occurred.
1 CHECK OTHER DTC(IN ADDITION TO P2237)
(a) Connect the hand −held tester to the DLC3.
(b) Turn the ignition switch to ON and turn the hand −held tester ON.
(c) Select the item ”DIAGNOSIS / OBD/MOBD / DTC INFO / CURRENT CODES”.
(d) Read DTCs.
Result:
Display (DTC output)Proceed to
P2237 and P2238 and/or P2239A
P2237B
B REPLACE ECM (See page 10− 29)
A
2 INSPECT AIR FUEL RATIO SENSOR(RESISTANCE)
(a) Disconnect the A34 A/F sensor connector.
(b) Measure the resistance between the terminals of the A/F sensor.
Resistance (w/ Headlight beam level control):
Tester ConnectionSpecified Condition
HT (1) − +B (2)0.86 to 1.1
at 20 _C (68 _F)
Resistance (w/o Headlight beam level control):
Tester ConnectionSpecified Condition
HT (2) −+B ( 1)0.86 to 1.1
at 20 _C (68 _F)
(c) Reconnect the A/F sensor connector.
NG REPLACE AIR FUEL RATIO SENSOR
OK

G23400G29214
Accelerator Pedal
Opening Angle
Lock−up OFF
Lock−up ON

time Engine Speed
Accelerator Pedal
Fully Released
− DIAGNOSTICSELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U151E)05−583
AVENSIS Supplement (RM1045E)
INSPECTION PROCEDURE
HINT:
Performing the ACTIVE TEST using the hand−held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as the first step of troubleshooting is one method
to shorten labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Warm up the engine.
(b) Turn the ignition switch off.
(c) Connect the hand−held tester to the DLC3.
(d) Turn the ignition switch to the ON position.
(e) Push the ”ON” button of the hand−held tester.
(f) Select the item ”DIAGNOSIS / OBD/MOBD / ACTIVE TEST”.
(g) According to the display on tester, perform the ”ACTIVE TEST”.
ItemTest DetailsDiagnostic Note
LOCK UP
[Test Details]
Control the shift solenoid DSL to set the automatic transaxle to the
lock−up condition.
[Vehicle Condition]
Vehicle Speed: 60 km/h (37 mph) or more
Possible to check the DSL opera-
tion.
HINT:
SThis test can be conducted when the vehicle speed is 60 km/h (37 mph) or more.
SThis test can be conducted with the 5th gear.
(h) Lightly depress the accelerator pedal and check that the engine speed does not change abruptly.
HINT:
SWhen changing the accelerator pedal opening angle while driving, if the engine speed does not
change, lock−up is on.
SSlowly release, but not fully, the accelerator pedal in order to decelerate. (Fully releasing the pedal will
close the throttle valve and lock−up may be turned off.)

05JLB−01
G23403
Hand −Held Tester
DLC3
−
DIAGNOSTICS ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U 151E)05 −553
AVENSIS Supplement (RM 1045E)
DIAGNOSIS SYSTEM
1. DESCRIPTION for EURO −OBD (European spec.)
S When troubleshooting Euro −OBD vehicles, the only dif-
ference from the usual troubleshooting procedure is that
you c onnect an O BD scan t ool com plying wit h I SO
1 503 1− 4 or a hand −held tester to the vehicle, and read
the various data output from the vehicle’s ECM.
S Eur o −O BD r egulat ions r equir e t hat t he v ehicle’s on −
board computer illuminates the check engine warning
light (CHK ENG (MIL)) on the instrument panel when the
computer detects a malfunction in: 1) the emission control
system / components, or 2) the powertrain control compo-
nents (which affect vehicle emissions), or 3) the comput-
er. In addition, the applicable Diagnostic Trouble Codes
(DTCs) prescribed by ISO 1503 1− 4 are recorded in the
ECM memory (see page 05 −564).
If the malfunction does not reoccur in 3 consecutive trips, the
CHK ENG (MIL) goes off automatically but the DTCs remain re-
corded in the ECM memory.
S To check the DTCs, connect the OBD scan tool or hand −
held tester to Data Link Connector 3 (DLC3) on the ve-
hicle. The OBD scan tool or hand −held tester also en-
ables you to erase the DTCs and check the freeze frame
data and various forms of engine data. (See the instruc-
tion manual for the OBD scan tool or the hand −held tes-
ter).
S DTCs include ISO controlled codes and manufacturer
controlled codes. ISO controlled codes must be set ac-
cording to the ISO, while manufacturer controlled codes
can be set by a manufacturer within certain restrictions
(see the DTC chart on page 05 −564).
S The diagnosis system operates in normal mode during
normal vehicle use. In ”normal mode”, 2 trip detection log-
ic* is used to ensure accurate detection of malfunctions.
A ”check mode”, is also available to technicians as an op-
tion. In ”check mode”, 1 trip detection logic is used for sim-
ulating malfunction symptoms and increasing the sys-
tem’s ability to detect malfunctions, including intermittent
malfunctions (hand −held tester only)
(see page 05 −557).
S*2 trip detection logic:
When a malfunction is first detected, the malfunction is
temporarily stored in the ECM memory ( 1st trip). If the
ignition switch is turned OFF and then ON again, and the
same malfunction is detected again, the CHK ENG (MIL)
will illuminate (2nd trip).

056IN−05
−
DIAGNOSTICS ELECTRONIC CONTROLLED AUTOMATIC
TRANSAXLE [ECT] (U 151E)05 −545
AVENSIS Supplement (RM 1045E)
PROBLEM SYMPTOMS TABLE
HINT:
If a normal code is displayed during the diagnostic trouble code check although the trouble still occurs, check
the electrical circuits for each symptom in the order given in the charts on the following pages and proceed
to the page given for troubleshooting.
The Matrix Chart is divided into 2 chapters.
1. Chapter 1: Electronic Circuit Matrix Chart
S Refer to the table below when the trouble cause is considered to be electrical.
S If the instruction ”Proceed to next circuit inspection shown on matrix chart” is given in the flow chart
of each circuit, proceed to the circuit with the next highest number in the table to continue the check.
S If the trouble still occurs even though there are no abnormalities in any of the other circuits, check and
replace the ECM.
HINT:
* 1 : When the circuit on which mark * 1 is attached is a malfunction, DTC could be output (see page 05 −564).
*2: LHD
SymptomSuspect AreaSee page
No down −shift
(A particular gear, from 1st to 4th gear, is not down −shifted)
1. Shift solenoid valve (SL 1) circuit*1
2. Shift solenoid valve (SL2) circuit*1
3. Shift solenoid valve (SL3) circuit*1
4. Shift solenoid valve (SR) circuit*1
5. ECM
05 −589
05 −60 1
05 −61 0
05 −598
0 1− 32
No down −shift (5th
4th)
1. Park/neutral position switch circuit *1
2. Shift solenoid valve (S4) circuit*1
3. ECM
05 −566
05 −595
0 1− 32
No up −shift
(A particular gear, from 1st to 4th gear, is not up −shifted)1. Shift solenoid valve (SL 1) circuit*1
2. Shift solenoid valve (SL2) circuit*1
3. ECM
05 −589
05 −60 1
0 1− 32
No up −shift (4th
5th)
1. Park/neutral position switch circuit *1
2. Shift solenoid valve (S4) circuit*1
3. ECM
05 −566
05 −595
0 1− 32
No lock −up
1. Shift solenoid valve (DSL) circuit*1
2. Stop light switch circuit*1
3. Engine coolant temp. sensor circuit*1
4. ECM
05 −582
05 −580
05 −31
0 1− 32
No lock −up off1. Shift solenoid valve (DSL) circuit*1
2. ECM
05 −582
0 1− 32
Shift point too high or too low
1. Throttle position sensor circuit*1
2. Shift solenoid valve (SLT) circuit*1
3. ECM
05 −31
05 −622
0 1− 32
Up −shift to 5th from 4th while engine is cold1. Engine coolant temp. sensor circuit*1
2. ECM
05 −31
0 1− 32
No gear change by shifting into ”+” or ” −” while the shift lever is in
the S position1 . Transmission control switch circuit
2. ECM05 −625
0 1− 32
Harsh engagement (N
D)1. Shift solenoid valve (SL 1) circuit*1
2. ECM
05 −589
0 1− 32
Harsh engagement (Lock −up)1. Shift solenoid valve (SL2) circuit*1
2. ECM
05 −60 1
0 1− 32
Harsh engagement (Any driving position)1. Shift solenoid valve (SLT) circuit*1
2. ECM
05 −622
0 1− 32
Poor acceleration1. Shift solenoid valve (SLT) circuit*1
2. ECM
05 −622
0 1− 32