2001 TOYOTA AVALON brake sensor
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- DIAGNOSTICSBODY CONTROL SYSTEM
DI-623
779 Author: Date:
2001 AVALON (RM808U)
HEADLIGHT AND TAILLIGHT SYSTEM (CANADA):
SymptomSuspect AreaSee page
Only one side headlight does not light.
1. Headlight bulb
2. HEAD LWR (LH, RH) fuse
3. Wire harness-
BE-9
IN-30
Headlight does not light.
1. Headlight bulb
2. Headlight control relay circuit
3. Light control switch circuit
4. Wire harness-
DI-635
DI-631
IN-30
ºLo-Beamº does not light.
1. Headlight bulb
2. HEAD LWR (LH, RH) fuse
3. Headlight control relay circuit
4. Headlight dimmer switch
5. Wire harness-
BE-9
DI-635
DI-631
IN-30
ºHi-Beamº does not light.
1. Headlight bulb
2. HEAD UPR (LH, RH) fuse
3. DRL fuse
4. D.R.L. relay No.2, 3 and 4 relay circuit
5. Headlight dimmer switch
6. Wire harness-
BE-9
BE-9
DI-668
DI-631
IN-30
ºFlashº does not light.
1. Headlight bulb
2. HEAD UPR (LH, RH) fuse
3. DRL fuse (R/B No.7)
4. D.R.L. relay No.2, 3 and 4 relay circuit
5. Headlight dimmer switch
6. Wire harness-
BE-9
BE-9
DI-668
DI-631
IN-30
Headlight does not light with engine running and light control SW
OFF.
1. DOME fuse
2. GAUGE fuse
3. DRL fuse
4. Parking brake switch circuit
5. Generator
6. Wire harnessBE-9
BE-9
BE-9
DI-670
CH-9
IN-30
Only one side taillight does not light.1. Bulb
2. Wire harness-
IN-30
Taillight does not light.
1. TAIL fuse
2. Taillight control relay circuit
3. Light control switch circuit
4. Body ECU
5. Wire harnessBE-9
DI-633
DI-631
IN-30
IN-30
Rear Combination light does not light.
1. Taillight bulb
2. Light failure sensor
3. Wire harness-
BE-53
IN-30
AUTO TURN OFF SYSTEM:
SymptomSuspect AreaSee page
ºAuto turn-off systemº does not operate.
1. Drivers door courtesy switch circuit
2. Driver door ECU
3. Multiplex communication circuit
4. Body ECUDI-639
DI-676
DI-718
IN-30
Page 848 of 1897
I13617
Cruise Control ECU
4 3
3
W-B8 Stop Light Switch
4Cruise Control Actuator
13
II1
IJJ9
J/CL
9P-B P-B G-B GNDL
AC4
S4
C15
W-B II1
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-563
719 Author: Date:
2001 AVALON (RM808U)
DTC 12 Actuator Magnetic Clutch Circuit
CIRCUIT DESCRIPTION
This circuit turns on the magnetic clutch inside the actuator during cruise control operation according to the
signal from the ECU. If a malfunction occurs in the actuator or speed sensor, etc. during cruise control opera-
tion, the rotor shaft between the motor and control plate is released.
When the brake pedal is depressed, the stop light switch turns on, supplying electrical power to the stop light.
Power supply to the magnetic clutch is mechanically cut and the magnetic clutch is turned OFF.
When driving downhill, if the vehicle speed exceeds the set speed by 15 km/h (9 mph), the ECU turns the
safety magnet clutch OFF. If the vehicle speed later drops to within 10 km/h (6 mph), cruise control at the
set speed is resumed.
DTC No.Detection ItemTrouble Area
12Short in actuator magnetic clutch circuit.
Open (0.8 sec.) in actuator magnetic clutch circuit.
STOP Fuse
Stop light switch
Actuator magnetic clutch
Harness or connector between cruise control ECU and
actuator magnetic clutch, actuator magnetic clutch and body
ground
Cruise control ECU
WIRING DIAGRAM
DI08N-15
Page 890 of 1897
I13679
(a)
(a)(b)
No.Operation MethodCRUISE MAIN Indicator Light
Blinking PatternDiagnosis
1 Push SET/COAST switch ON
2Push RES/ACC switch ON
3Push CANCEL switch ON
Turn stop light switch ON
Depress brake pedal
Turn PNP switch OFF
(Shift to except D position)
4Drive at about 40 km/h
(25 mph)or higher
Drive at about 40 km/h
(25 mph) or below
LightON
OFF
LightON
OFF
LightON
OFFSwitch ON
Switch OFF
LightON
OFFSwitch OFF
Switch ONSET/COAST switch circuit
is normal
RES/ACC switch circuit
is normal
CANCEL switch circuit
is normal
Stop light switch circuit
is normal
PNP switch circuit is
normal
Vehicle Speed Sensor is
normal
LightON
OFF LightON
OFF
1sec.
0.25 sec.0.25 sec.
Turn clutch switch OFF
(Depress clutch pedal)Clutch switch circuit
is normal
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-555
711 Author: Date:
2001 AVALON (RM808U)
5. INPUT SIGNAL CHECK
HINT:
(1) For check No.1 ~ No.3:
Turn ignition switch ON.
(2) For check No.4:
Jack up the vehicle.
Start the engine.
Shift to D position.
(a) Push the control switch to SET/COAST or RES/ACC posi-
tion and hold it down or up.
(b) Push the main switch ON.
(c) Check that the CRUISE MAIN indicator light blinks twice
or 3 times repeatedly after 3 seconds.
(d) Push the SET/COAST or RES/ACC switch OFF.
(e) Operate each switch as listed in the table below.
(f) Read the blinking pattern of the CRUISE MAIN indicator
light.
(g) After performing the check, turn the main switch OFF.
HINT:
When 2 or more signals are input to the ECU, the lowest num-
bered code will be displayed 1st.
Page 891 of 1897
DI08L-15
DI-560
- DIAGNOSTICSCRUISE CONTROL SYSTEM
716 Author: Date:
2001 AVALON (RM808U)
PROBLEM SYMPTOMS TABLE
SymptomSuspect AreaSuspect AreaSee page
SET not occourring or CANCEL occurring.
(DTC is Normal)
1. Vehicle Speed Sensor
2. Control Switch Circuit (Cruise control switch)
3. Stop Light Switch Circuit
4. Park/Neutral Position Switch Circuit
5. Actuator Motor Circuit
6. Cruise Control Cable
7. Cruise Control ECUDI-568
DI-572
DI-578
DI-584
DI-561
DI-596
IN-30
SET not occurring or CANCEL occurring.
(DTC dose not output)1. ECU Power Source Circuit
2. Cruise Control ECUDI-587
IN-30
Actual vehicle speed deviates above or below the set speed.
1. Cruise Control Cable
2. Vehicle Speed Signal Abnormal
3. Electronically Controlled Transmission
Communication Circuit
4. Actuator Motor Circuit
5. Idle Signal Circuit (Main throttle position sensor)
6. Cruise Control ECUDI-596
DI-568
DI-581
DI-581
DI-561
DI-575
IN-30
Gear shifting frequent between 3rd O/D when driving on uphill
road. (Hurting)1. Electronically Controlled Transmission
Communication Circuit
2. Cruise Control ECUDI-581
DI-581
IN-30
Cruise control not cancelled, even when brake pedal is de-
pressed.
1. Cruise Control Cable
2. Stop Light Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI-596
DI-578
DI-561
IN-30
Cruise control not cancelled, even when transmission is shifted to
ºNº postion.
1. Cruise Control Cable
2. Park/Neutral Position Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI-596
DI-584
DI-561
IN-30
Control switch does not operate.
(SET/COAST, ACC/RES, CANCEL not possible)
1. Cruise Control Cable
2. Control Switch Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI-596
DI-572
DI-561
IN-30
SET possible at 40 km/h (25 mph) or less, or CANCEL does not
operate at 40 km/h (25 mph) or less.
1. Cruise Control Cable
2. Vehicle Speed Signal Abnormal
3. Actuator Motor Circuit
4. Cruise Control ECUDI-596
DI-568
DI-561
IN-30
Poor response is in ACCEL and RESUME modes.
1. Cruise Control Cable
2. Electronically Controlled Transmission
Communication Circuit
3. Actuator Motor Circuit
4. Cruise Control ECUDI-596
DI-581
DI-581
DI-561
IN-30
O/D does not resume, even though the road is not uphill.
1. Electronically Controlled Transmission
Communication Circuit
2. Cruise Control ECUDI-581
DI-581
IN-30
DTC memory is erased.1. Cruise Control ECUIN-30
DTC is not output, or is output when should not be.1. Diagnosis Circuit
2. Cruise Control ECUDI-594
IN-30
Cruise MAIN indicator light remains ON or falls to light up.1. Cruise MAIN Indicator Light Switch CircuitDI-592
Page 1013 of 1897
A11416
Fusible
Link
Block
FL
Main
BatteryStop Light
Switch
ALT
B
F10
F6STOP
R
211D 1B
1E
45
Light
Failure
Sensor 7
2
To Stop LightE8 15ECM
STP
E1 Driver Side J/B
3 11
W
1 1
16
4C 3C
3164F3F 3
5IK1 1D 1
1GG-W
G-WDriver Side J/B
J/B No.3
J/B No.4
G-W
G-W G-W G-W
DI-134
- DIAGNOSTICSENGINE
290 Author: Date:
2001 AVALON (RM808U)
DTC P1520 Stop Light Switch Signal Malfunction
CIRCUIT DESCRIPTION
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as
the voltage supplied to the stop lights.
The STP signal is used mainly to control the fuel cut-off engine speed (The fuel cut-off engine speed is re-
duced slightly when the vehicle is braking.).
DTC No.DTC Detecting ConditionTrouble Area
P1520
Stop light switch does not turn off when repeating driving at 30
km or more 10 time or more after depressing brake (2 trip
detection logic)Short in stop light switch signal circuit
Stop light switch
ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand-held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected. When troubleshooting, it is useful for determining
whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean
or rich, etc. at the time of the malfunction.
1 Check operation of stop light.
CHECK:
Check if the stop lights go on and off normally when the brake pedal is operated and released.
NG Check and repair stop light circuit.
DI088-09
Page 1050 of 1897
- 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
Page 1095 of 1897
DI0FV-08
- DIAGNOSTICSPOWER SEAT CONTROL SYSTEM (w/ Driving Position
Memory)DI-493
649 Author: Date:
2001 AVALON (RM808U)
PROBLEM SYMPTOMS TABLE
Perform troubleshooting of the circuits for the applicable problem symptom in the order given in the chart
below. Proceed to the page located for each circuit.
HINT:
If the instruction ºProceed to next circuit inspection shown on problem symptom tableº is given in the
flow chart for each circuit, proceed to the circuit with the next highest number in the table to continue
the check.
If the trouble still reappears even though there are no abnormalities in any of the other circuits, then
check and replace the Seat Position Control ECU as the last step.
SymptomSuspect AreaSee page
Both manual & return functions do not operate(All functions).
3. +B power source circuit
4. Power seat control switch circuit
5. Motor circuit
6. Power seat control ECUDI-494
DI-510
DI-500
IN-30
Both manual & return functions do not operate(One function only).1. Motor circuit
2. Power seat control ECUDI-500
IN-30
One or all functions do not operate for manual operation only.1. Power seat control switch circuit
2. Power seat control ECUDI-510
IN-30
Memory function does not operate.
1. Power seat memory switch circuit
2. Ignition switch circuit
3. Power seat control ECUDI-510
DI-508
IN-30
Return operation does not stop when brake pedal is depressed.1. Stop light switch circuit
2. Power seat control ECUDI-662
IN-30
Only return function does not operate or operates a little, then
stops (All return functions).
1. Power seat memory switch circuit
2. ECU power source circuit
3. Position sensor power source circuit
4. Power seat control ECUDI-513
DI-497
DI-504
IN-30
Only return function does not operate or operates a little, then
stops (Only one return function).1. Position sensor circuit
2. Power seat control ECUDI-506
IN-30
Page 1287 of 1897
EM-2
- ENGINE MECHANICALCO/HC
986 Author: Date:
2001 AVALON (RM808U)
If the CO/HC concentration does not comply with regulations,
troubleshoot in the order given below.
See the table below for possible causes, and then inspect and
correct the applicable causes if necessary.
COHCProblemsCauses
NormalHighRough idle3. Faulty ignitions:
Incorrect timing
Fouled, shorted or improperly gapped plugs
4. Incorrect valve clearance
5. Leaky intake and exhaust valves
6. Leaky cylinders
LowHighRough idle
(Fluctuating HC reading)1. Vacuum leaks:
PCV hoses
Intake manifold
Air intake chamber
Throttle Body
IAC valve
Brake booster line
2. Lean mixture causing misfire
HighHighRough idle
(Black smoke from exhaust)1. Restricted air filter
2. Plugged PCV valve
3. Faulty SFI systems:
Faulty pressure regulator
Defective ECT sensor
Faulty ECM
Faulty injectors
Faulty throttle position sensor
Faulty MAF meter