2001 TOYOTA AVALON check engine

F07902
PMCE2
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-301
457 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1, in case of using the TOYOTA hand-held tester and start from step 2, in case
of not using the TOYOTA hand-held tester.
1 Check output value of the master cylinder pressure sensor.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
(c) Select the DATALIST mode on the TOYOTA hand-held tester.
CHECK:
Check that the brake fluid pressure value of the master cylinder pressure sensor displayed on the TOYOTA
hand-held tester is changing when depressing the brake pedal.
OK:
Brake fluid pressure value must be changing.
OK Go to step 4.
NG
2 Check master cylinder pressure sensor.
PREPARATION:
Install LSPV gauge to the front caliper bleeder plug portion, and
bleed the air from LSPV gauge.
SST 09709-29018
CHECK:
Start the engine and depress the brake pedal, then check the
relation between the fluid pressure and voltage of PMC and E2
terminals of the master cylinder pressure sensor with connector
still connected.
OK:
Front brake caliper fluid pressureVoltage
0 kPa (0 Kgf/cm2, 0 psi)0.44 - 0.76 V
5,883 kPa (60 kgf/cm2, 853 psi)1.34 - 1.66 V
11,768 kPa (120 kgf/cm2, 1,706 psi)2.24 - 2.56 V
HINT:
Voltage between terminals VCM and E2: 4.7 - 5.3 V
NG Replace master cylinder pressure sensor.
OK

F10171
Normal Signal Waveform
2 m/s / DivisionGND
1 V / Division
DI-312
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
468 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check DTC of translate ECU.
Check DTC on page DI-252.
*1 Repair circuit indicated by the output code.
*2
2 Check transrate ECU communication.
REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the translate ECU.
(b) Connect the oscilloscope to the terminal VSC+ (4) and
GND (14) of the translate ECU harness side connector.
CHECK:
Start the engine, and check the signal waveform.
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
3 Check for open and short circuit in harness and connector between each of ter-
minals VSC+ and VSC- of translate ECU and ABS & BA & TRAC & VSC ECU (See
page IN-30).
NG Repair or replace harness or connector.
OK
Check and replace ABS & BA & TRAC & VSC
ECU.
*1: Output NG code
*2: Output nomal code

F09477
ON
NEO
13
F03007
(Reference)
3 - 6 V
Below 1 V
DI-314
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
470 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check for open and short circuit in harness and connector between terminal
NEO of translate ECU and terminal NEO of ECM (See page IN-30).
NG Repair or replace harness and connector.
OK
2 Check voltage between terminal NEO (13) of translate ECU and body ground.
PREPARATION:
Remove the translate ECU with connectors still connected.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminal 13 of the translate
ECU and body ground under the engine conditions below.
OK:
Engine conditionVoltage
OFF (IG ON)3 - 6 V or below 1 V
ON (Idling)3 - 6 V e below 1 V (Pulse)
NG Check and replace ECM.
OK
Check and replace transrate ECU.
If the same code is still output after the DTC is deleted, check the contact condition of each con-
nection.

F10171
Normal Signal Waveform
2 m/s / DivisionGND
1 V / Division
DI-316
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
472 Author
: Date
:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check translate ECU communication.
REFERENCE: INSPECTION USING OSCILLOSCOPE
PREPARATION:
(a) Remove the translate ECU.
(b) Connect the oscilloscope to each of the terminals ENG+
or TRC+ and GND of the translate ECU harness side con-
nector.
CHECK:
Start the engine, and check the signal waveform.
OK Check and replace translate ECU.
NG
2 Check for open and short circuit in harness and connector between each of ter-
minals ENG+, ENG-, TRC+ and TRC- of translate ECU and ECM (See page
IN-30).
NG Repair or replace harness or connector.
OK
Check and replace ECM.

- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-317
473 Author
: Date
:
2001 AVALON (RM808U)
DTC Normal Code Malfunction in ECM
CIRCUIT DESCRIPTION
If any trouble occurs in the ECM control system, the ECU prohibits ABS & VSC control.
DTC No.DTC Detecting ConditionTrouble Area
Normal Code
Conditions 1., 2,. 3, or 4,continue for 5 sec. or more:
1. Engine malfunction signal is sent from ECM.
2. Shift malfunction signal is sent from ECM
3. The shift position is other than P and N range input volt-
age is 8 V or more.
4. The shift position is PN or rev and D range input voltage
is 8 V or more.
ECM circuit

ECM

Brake fluid level

Brake fluid level warning switch circuit

Steering angle sensor

ABS & BA & TRAC & VSC ECU
INSPECTION PROCEDURE
1 Is DTC out put for ECM?
Check DTC on page DI-3.
YES Repair engine control system according to the
output code.
NO
2 Check the DTC for the ABS and VSC (See page DI-252).
*1 Repair ABS and VSC control system according
to the code output.
*2
Check and replace translate ECU.
*1: Output NG code except for DTC of VSC system C1301/42
*2: Output NG code DTC of VSC system C1301/42 only
DI6OF-03

F09811
Battery
FL MAIN
B F61 F10 F81
1
ALT
FL
BlockB-L
2G
2H1 1 5
5 1 2AM1 Engine Room R/B No. 5
Engine Room J/BB W-LW-L
IF17 W-R
2
IG1 AM1 4Ignition Switch WDriver Side J/B
1G1
1B 13
1B3
1C4
3
4 12 IG1 RelayECU-IG
No. 2
W-B
IG Y-R
L-WABS & BA &
TRAC & VSC ECU
A20 V9
VSC Warning
Buzzer
BZ 86
Buzzer1 2
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-339
495 Author
: Date
:
2001 AVALON (RM808U)
VSC Buzzer Circuit
CIRCUIT DESCRIPTION
The VSC buzzer sounds during VSC operation.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Start the inspection from step 1 in case of using the TOYOTA hand-held tester and start from step 3 in case
of not using the TOYOTA hand-held tester.
1 Check operation of the VSC buzzer.
PREPARATION:
(a) Connect the TOYOTA hand-held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand-held tester main switch ON.
(c) Select the ACTIVE TEST mode on the TOYOTA hand-held tester.
CHECK:
Check ºON-OFFº function of the VSC buzzer with the TOYOTA hand-held tester.
OK Check and replace ABS & BA & TRAC & VSC
ECU.
NG
DI6ON-03

F02201
DLC1
TsTc E
1
BR3904
0.13 sec. 0.13 sec.
ON
OFF
BR3893
Malfunction Code (Example Code 72, 76)
72 67
ON
OFF
0.5 sec. 0.5 sec. 0.5 sec. 0.5 sec.1.5 sec.
2.5 sec.4 sec.
Repeat
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
DI-255
411 Author
: Date
:
2001 AVALON (RM808U)
2. SPEED SENSOR SIGNAL CHECK (TEST MODE)
(a) In case of not using TOYOTA hand-held tester:
Check the sensor signal.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and E
1 of DLC1.
SST 09843-18020
(3) Start the engine.
(4) Check that the ABS warning light blinks.
HINT:
If the ABS warning light does not blink, inspect the ABS warning
light circuit (See page DI-325).
(5) Drive vehicle straight forward.
Drive vehicle at a speed faster than 45 km/h (28
mph) for several seconds.
HINT:
The sensor check may not be completed if the front wheels are
spun or the steering wheel is steered during this check.
(6) Stop the vehicle.
(7) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843-18020
(8) Read the number of blinks of the ABS warning light.
HINT:

See the list of DTC shown on the next page.

If every sensor is normal, a normal code is output (A cycle
of 0.25 sec. ON and 0.25 sec. OFF is repeated).

If 2 or more malfunction codes are identified at the same
time, the lowest numbered code will be displayed 1st.
(9) After doing the check, disconnect the SST from ter-
minals Ts and E
1, Tc and E1 of DLC1, and turn the
ignition switch OFF.
SST 09843-18020

F07887
TOYOTA Hand-
held Tester
DLC3
F19119
DLC1
Ts E1
DLC3
CG
Ts
DI-256
- DIAGNOSTICSABS WITH EBD & BA & TRAC & VSC SYSTEM
412 Author
: Date
:
2001 AVALON (RM808U)
(b) In case of using TOYOTA hand-held tester:
Check the sensor signal.
(1) Hook up the TOYOTA hand- held tester to the
DLC3.
(2) Do step (3) - (6) on the previous page.
(3) Read the DTC by following the prompts on the tes-
ter screen.
HINT:
Please refer to the TOYOTA hand-held tester operator's manu-
al for further details.
DTC of speed sensor check function:
Code No.DiagnosisTrouble Area
C1271 / 71Low output voltage of right front speed sensor

Right front speed sensor

Sensor installation

Right front speed sensor rotor
C1272 / 72Low output voltage of left front speed sensor

Left front speed sensor

Sensor installation

Left front speed sensor rotor
C1273 / 73Low output voltage of right rear speed sensor

Right rear speed sensor

Sensor installation

Right rear speed sensor rotor
C1274 / 74Low output voltage of left rear speed sensor

Left rear speed sensor

Sensor installation

Left rear speed sensor rotor
C1275 / 75Abnormal change in output signal of right front speed sen-
sorRight front speed sensor rotor
C1276 / 76Abnormal change in output signal of left front speed sensorLeft front speed sensor rotor
C1277 / 77Abnormal change in output signal of right rear speed sensorRight rear speed sensor rotor
C1278 / 78Abnormal change in output signal of left rear speed sensorLeft rear speed sensor rotor
3. STEERING ANGLE SENSOR ZERO POINT CALIBRA-
TION
NOTICE:
Make sure to perform steering angle sensor zero point cal-
ibration when:

Replacing the steering angle sensor or ECU.

Adjusting the front wheel alignment of the steering
wheel center point in accordance with removal and
installation or replacement of the suspension, axle or
steering parts.
(a) Using the SST, connect terminals Ts and E
1 of DLC1 or
Ts and CG of DLC3
.
SST DLC1: 09843-18020
DLC3: 09843-18040
(b) Turn the ignition switch to the ON position, without start-
ing the engine.
(c) Make sure the steering wheel off center angle is within 3
degrees of center before attempting calibration.