Page 742 of 1897
DI4DO-02
A00022
4-pulse
Combination
MeterECM 4-pulse
From
Speed SensorABS ECU DI-178
- DIAGNOSTICSAUTOMATIC TRANSAXLE
334 Author: Date:
2001 AVALON (RM808U)
CIRCUIT INSPECTION
DTC P0500 Vehicle Speed Sensor Malfunction
CIRCUIT DESCRIPTION
The speed sensor for ABS detects the wheel speed and sends the appropriate signals to the ABS ECU.
The ECU converts these signals in to a 4-pulse signal and outputs it to the combination meter.
After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit in-
side the combination meter, it is then transmitted to the ECM. The ECM determines the vehicle speed based
on the frequency of these pulse signals.
DTC No.DTC Detecting ConditionTrouble Area
P0500
Satisfying all of the following conditions, 2 sec. (Intake air tem-
perature: -10 °C or more) or 8 sec. (Intake air temperature:
less than -10 °C) elapsed.
(c) After 2 sec. (the engine coolant temperature: 20 °C or
more) or 30 sec. (the engine coolant temperature: less than
20 °C) with the park/neutral position switch set to P, N posi-
tion.
(d) No abnormality of the throttle position sensor is detected.
(e) After 0.5 sec. or more with the ignition switch turned ON.
(f) No vehicle speed is signal to ECM.
(g) The engine rpm is equal to the speed sensor rpm or more
when the throttle opening angle is as shown below.
1. The throttle opening angle is less than 13° and the engine
rpm is 2,350 or more.
2. The throttle opening angle is less than 21° and the engine
rpm is 2,680 or more.
3. The throttle opening angle is less than 30° and the engine
rpm is 2,835 or more.
4. The throttle opening angle is less than 30° and the engine
rpm is 3,145 or more.
Open or short in vehicle speed sensor circuit
ABS speed sensor
Combination meter
ECM
ABS ECU
Automatic transaxle (clutch, brake or gear etc.)
Clutch or brake slips or gear is broken (2-trip detection logic)
Page 757 of 1897
Q04869
NC2 Revolution Sensor
D07907
E4
E4 1O1 2
G R
Direct Clutch
Speed Sensor24
NC2+
ECM
NC2
-
23
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-193
349 Author: Date:
2001 AVALON (RM808U)
DTC P1705 NC2 Revolution Sensor Circuit Malfunction
(Direct Clutch Speed Sensor)
CIRCUIT DESCRIPTION
This sensor detects the rotation speed of the direct clutch drum.
By comparing the direct clutch speed signal with the vehicle
speed sensor signal, the ECM detects the shift timing of the
gears and appropriately controls the engine torque and hydrau-
lic pressure in response to various conditions, thus performing
smooth gear shifting.
DTC No.DTC Detecting ConditionTrouble Area
P1705
The ECM detects conditions (a), (b), (c), (d), (e) and (f) conti-
nuity for 4 secs. or more.
(2-trip detection logic)
(a) Gear change not being performed
(b) Gear position: 1st, 2nd 3rd or O/D
(c) T/M input shaft rpm: 300 rpm or less
(d) T/M output shaft rpm: 1,000 rpm or more
(e) Park/neutral position switch: OFF
(f) Shift solenoid valves No. 1, No. 2, SL and vehicle speed
sensor are in normal operation.
Open or short in direct clutch speed sensor circuit
Direct clutch speed sensor
ECM
WIRING DIAGRAM
DI02P-07
Page 759 of 1897
AT5608
Accumulator Control Pressure
High
Electric Current (A) 0
1
D00060
(*) Duty Ratio
The duty ratio is the ratio of the period of continuity in one cycle.
For example, if A is the period of continuity in one cycle, and B is the period of non-continuity, then
D00062
Reference
Waveform between terminals SLN
+
and SLN- when engine is idling.
5 V / Div.
GND Waveform between terminals SLN
+
and SLN- during shift change.
5 V / Div.
GND
1 msec. / Div.1 msec. / Div.
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-195
351 Author: Date:
2001 AVALON (RM808U)
DTC P1765Linear Solenoid for Accumulator Pressure Control
Circuit Malfunction (Shift Solenoid Valve SLN)
CIRCUIT DESCRIPTION
The shift solenoid valve SLN controls the hydraulic pressure
acting on the accumulator control valve when gears are shifted
and performs smooth gear shifting.
The ECM determines optimum operating pressure according to
the signals from the throttle position sensor, vehicle speed sen-
sor and direct clutch speed sensor and controls the volume of
current flow to the solenoid valve.
The amount of current to the solenoid is controlled by the (*)
duty ratio of ECM output signals, causing a momentary change
to the hydraulic pressure acting on the clutches during gear
shifting.
When the duty ratio is high, the hydraulic pressure acting on the
clutches is low.
DTC No.DTC Detecting ConditionTrouble Area
P1765
After the engine is warmed up, the current flows to the shift
solenoid valve SLN for 1 sec or more under condition (a) or
(b):
(a) Engine speed: 500 rpm or more
(b) Park/neutral position switch: ON (P or N position)
Open or short in shift solenoid valve SLN circuit
Shift solenoid valve SLN
ECM
DI02Q-07
Page 839 of 1897
- 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 845 of 1897
- DIAGNOSTICSBODY CONTROL SYSTEM
DI-621
777 Author: Date:
2001 AVALON (RM808U) B5-6 e B5-14
RLWBIgnition switch ON10 - 14 VB5 6 e B5 14
(ALTL e GND1)R-L e W-BEngine runningBelow 1 V
B5-7 e B5-14
(CLTE e GND1)Y-B e W-BAutomatic light control sensor communication circuit-
B5-8 e B5-14
(CLTS e GND1)LG e W-BAutomatic light control sensor communication circuit-
B5-9 e B5-14
(MPX3 e GND1)R-Y e W-BMultiplex communication circuit-
B5-10 e B5-14
(RRU e GND1)G-B e W-BRear right side power window UP operationBelow 1 V
B5-1 1 e B5-14GRWBPassenger seat belt unfastenedBelow 1 VB5 1 1 e B5 14
(PBEW e GND1)G-R e W-BPassenger seat belt fastened10 - 14 V
B5-13 e Body ground
(CLTC e Body ground)W-B e Body groundConstantBelow 1 V
B5-14 e Body ground
(GND1 e Body ground)W-B e -ConstantBelow 1 V
B5-16 e B5-14RWWBRear door closed10 - 14 VB5 16 e B5 14
(RCTY e GND1)R-W e W-BRear door openedBelow 1 V
B5-17 e B5-14GWBPassenger seat belt unfastenedBelow 1 VB5 17 e B5 14
(PBKL e GND1)G e W-BPassenger seat belt fastened10 - 14 V
B5-18 e B5-14LBWBLuggage compartment door opener switch is operatedBelow 1 VB5 18 e B5 14
(TKU e GND1)L-B e W-BLuggage compartment door opener switch is not operated10 - 14 V
B5-20 e B5-14
(CLTB e GND1)L e W-BAutomatic light control sensor communication circuit-
B5-21 e B5-14
(MPX4 e GND1)G-B e W-BMultiplex communication circuit-
B5-22 e B5-14
(RRD e GND1)R-B e W-BRear right side power window DOWN operationBelow 1 V
B5-23 e B5-14GWWBPassenger seat belt unfastenedBelow 1 VB5 23 e B5 14
(DBEW e GND1)G-W e W-BPassenger seat belt fastened10 - 14 V
B5-25 e B5-14RWBEach door closed10 - 14 VB5 25 e B5 14
(AJAR- e GND1)R e W-BEach door openedBelow 1 V
Page 860 of 1897
I13614
IDL 13
IDLOE725 ECMCruise Control ECU
Y
C15
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-575
731 Author: Date:
2001 AVALON (RM808U)
DTC 51 Idle Signal Circuit
CIRCUIT DESCRIPTION
When the idle switch is turned ON, a signal is sent to the ECU. The ECU uses this signal to correct the dis-
crepancy between the throttle valve position and the actuator position sensor value to enable accurate
cruise control at the set speed. If the idle switch is malfunctioning, problem symptoms also occur in the en-
gine, so also inspect the engine.
DTC No.Detection ItemTrouble Area
51Short in idle signal circuit.
Harness or connector between ECM and throttle position
sensor
Throttle position sensor
Harness or connector between cruise control ECU and ECM
Cruise control ECU
WIRING DIAGRAM
DI6L6-01
Page 870 of 1897
I13611
Cruise Control ECU
9
B
Y-R
IG B 3 1
4IG1 RELAY
2
AM1 ECU-IG NO. 2
5 5
B-L
ALT FL Block
F6
B
FL MAIN
BatteryW-BW-B 1
2G
F8
W-B AA
J5
J/C 1 F101 1
1G
3
1B
1
2H13
1B
4
1C2
3C2
3D
7
IF1
7
3A20
3BGND
1W-B16 W-B WY-R
W-R42
I15Ignition Switch
C15
W-L
W-L
B-LIG1 AM1
2
1J/B No. 3
Driver Side J/B
Engine Room J/B
Engine Room R/B No. 5
J/B No. 3
- DIAGNOSTICSCRUISE CONTROL SYSTEM
DI-587
743 Author: Date:
2001 AVALON (RM808U)
ECU Power Source Circuit
CIRCUIT DESCRIPTION
The ECU power source supplies power to the actuator and sensors, etc, when terminal GND and the cruise
control ECU case are grounded.
WIRING DIAGRAM
DI08X-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.
