Page 739 of 1897
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-207
363 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Check operation of O/D main switch.
PREPARATION:
Turn the ignition switch ON.
CHECK:
(a) Check O/D OFF indicator light when O/D main switch is
pushed in to ON.
(b) Check O/D OFF indicator light when O/D main switch is
pushed again.
OK:
(a) O/D OFF indicator light lights up.
(b) O/D OFF indicator light goes off.
OK Proceed to next inspection shown on symp-
toms problem tables (See page DI-175).
NG
2 Check and replace the combination meter (See page BE-2).
NG Replace the combination meter.
OK
Page 747 of 1897
PositionNORMALSHIFT SOLENOID NO.1
MALFUNCTIONING
Solenoid valve
No.1GearSHIFT SOLENOID NO.2
MALFUNCTIONINGBOTH SOLENOIDS MAL-
FUNCTIONINGGear when shift selector is
manually operated
D
2
L
ON
1st 2nd
3rd
O/D
1st 2nd
3rd
1st
2nd1st
X: MalfunctionsNo.2
ONNo.1 No.2
No.1 No.2 Solenoid valveSolenoid valve
GearGear
OFF
OFF
ON ON
OFF
ON
ONOFF
OFF
OFF
OFFON
ON
ON
ON
ONX
3rd
X
X
X
X
X
X
X
XON
ON
ON
ON
ON
ON
ON3rd
3rd
3rd
3rd
3rd O/D
1st
2ndON
ON
ON
ON OFF
OFFOFF
OFF
OFF
OFF
OFFX
X
X
X
X
X
X
X
X1st
O/D
O/D
O/D
O/D
O/D
1st
1stO/D
O/D
O/D
O/D
O/D
O/D
O/D
1st
1st
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-183
339 Author: Date:
2001 AVALON (RM808U)
DTC P0753, P0758 Shift Solenoid A/B Electrical Malfunc-
tion (Shift Solenoid Valve No.1/No.2)
CIRCUIT DESCRIPTION
Shifting from 1st to O/D is performed in combination with ON and OFF of the shift solenoid valves No.1 and
No.2 controlled by ECM. If an open or short circuit occurs in either of the shift solenoid valves, the ECM con-
trols the remaining normal shift solenoid valve to allow the vehicle to be operated smoothly (Fail safe func-
tion).
Fail safe function:
If either of the shift solenoid valve circuits develops an open or short, the ECM turns the other shift solenoid
ON and OFF to shift to the gear positions shown in the table below. The ECM also turns the shift solenoid
valve SL OFF at the same time. If both solenoids are malfunctioning, hydraulic control cannot be performed
electronically and must be done manually.
Manual shifting as shown in the following table must be done (In the case of a short circuit, the ECM stops
sending current to the short circuited solenoid).
HINT:
Check the shift solenoid valve No.1 when DTC P0753 is output and check the shift solenoid valve No.2 when
DTC P0758 is output.
DTC No.DTC Detecting ConditionTrouble Area
P0753
P0758
The ECM checks for an open or short circuit in the shift sole-
noid valve No.1 and/or No.2 circuit when it changes.
The ECM records DTC P0753 or P0758 if condition (a) or (b) is
detected once, but it does not light up MIL.
After ECM detects condition (a) or (b) continuously 8 times or
more in a trip and the MIL lights up.
(a) When the solenoid is energized, the solenoid resistance
is 8 W or less and is counted.
(b) When the solenoid is not energized, the solenoid resistance
is 100 kW or more and is counted.
Open or short in shift solenoid valve No.1/No.2 circuit
Shift solenoid valve No.1/No.2
ECM
DI02L-08
Page 756 of 1897
DI-192
- DIAGNOSTICSAUTOMATIC TRANSAXLE
348 Author: Date:
2001 AVALON (RM808U)
DTC P1520 Stop Light Switch Signal Malfunction
CIRCUIT DESCRIPTION
The purpose of this circuit is to prevent the engine from stalling, while driving in lock-up condition, when
brakes are suddenly applied.
When the brake pedal is operated, this switch sends a signal to ECM. Then the ECM cancels operation of
the lock-up clutch while braking is in progress.
DTC No.DTC Detecting ConditionTrouble Area
P1520No stop light switch signal to ECM during driving.
(2-trip detection logic)Open or short in stop light switch circuit
Stop light switch
ECM
WIRING DIAGRAM
See page DI-134.
INSPECTION PROCEDURE
See page DI-134.
DI02O-06
Page 765 of 1897
D06555
L R
2NSW
Position
P, N
R
D
2
LNSW-Body
groundR-Body
ground2-Body
groundL-Body
ground
0 V 0 V
0 V
0 V
0 V0 V
0 V
0 V0 V
0 V
0 V
0 V
0 V 9 - 14 V
9 - 14 V
9 - 14 V 9 - 14 V*9 - 14 V*
9 - 14 V
9 - 14 V
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-201
357 Author: Date:
2001 AVALON (RM808U)
INSPECTION PROCEDURE
1 Read PNP, REVERSE, 2ND and LOW signals.
When using TOYOTA hand-held tester:
PREPARATION:
(a) Remove the DLC3 cover.
(b) Connect a TOYOTA hand-held tester to the DLC3.
(c) Turn the ignition switch ON and TOYOTA hand-held tes-
ter main switch ON.
CHECK:
Shift lever into the P, R, N, 2 and L positions, and read the PNP,
REVERSE, 2ND and LOW signals on the TOYOTA hand-held
tester.
OK:
Shift positionSignal
22ND OFF " ON
LLOW OFF " ON
RREVERSE OFF " ON
P, NNSW OFF " ON
When not using TOYOTA hand-held tester:
PREPARATION:
(a) Remove the glove compartment.
(b) Turn the ignition switch ON.
CHECK:
Measure voltage between each of terminals NSW, 2, L and R
of ECM and body ground when the shift lever is shifted to the
following positions.
OK:
HINT:
*: The voltage will drop slightly due to lighting up of the back up
light.
OK Check and replace the ECM (See page IN-30).
NG
Page 768 of 1897
DI02F-06
DI-172
- DIAGNOSTICSAUTOMATIC TRANSAXLE
328 Author: Date:
2001 AVALON (RM808U)
DIAGNOSTIC TROUBLE CODE CHART
If a DTC is displayed during the DTC check, check the circuit listed for that code in the table below and pro-
ceed to the page given.
*: ...MIL lights up
DTC No.
(See Page)Detection ItemTrouble AreaMIL *Memory
P0500
(DI-178)Vehicle Speed Sensor Malfunc-
tion
(Vehicle Speed Sensor)
Open or short in vehicle speed sensor circuit
Vehicle speed sensor
Combination meter
ECM
Automatic transaxle (clutch, brake or gear etc.)
P0750
(DI-181)Shift Solenoid A Malfunction
(Shift Solenoid Valve No.1)Shift solenoid valve No.1 is stuck open or closed
Valve body is blocked up or stuck
Automatic transaxle (clutch, brake or gear etc.)
P0753
(DI-183)Shift Solenoid A Electrical Mal-
function
(Shift Solenoid Valve No.1)Open or short in shift solenoid valve No.1 circuit
Shift solenoid valve No.1
ECM
P0755
(DI-181)Shift Solenoid B Malfunction
(Shift Solenoid Valve No.2)Shift solenoid valve No.2 is stuck open or closed
Valve body is blocked up or stuck
Automatic transaxle (clutch, brake or gear etc.)
P0758
(DI-183)Shift Solenoid B Electrical Mal-
function
(Shift Solenoid Valve No.2)Open or short in shift solenoid valve No.2 circuit
Shift solenoid valve No.2
ECM
P0770
(DI-187)Shift Solenoid E Malfunction
(Shift Solenoid Valve SL)
Shift solenoid valve SL is stuck open or closed
Valve body is blocked up or stuck
Lock-up clutch
Automatic transaxle (clutch, brake or gear etc.)
P0773
(DI-189)Shift Solenoid E Electrical Mal-
function
(Shift Solenoid Valve SL)Open or short in shift solenoid valve SL circuit
Shift solenoid valve SL
ECM
P1520
(DI-192)Stop Light Switch Signal Mal-
functionOpen or short in stop light switch circuit
Stop light switch
ECM
P1705
(DI-193)NC2 Revolution Sensor Circuit
Malfunction
(Direct Clutch Speed Sensor)Open or short in direct clutch speed sensor circuit
Direct clutch speed sensor
ECM
P1765
(DI-195)
Linear Solenoid for Accumulator
Pressure Control Circuit Mal-
function
(Shift Solenoid Valve SLN)Open or short in shift solenoid valve SLN circuit
Shift solenoid valve SLN
ECM
P1780
(DI-199)Park/Neutral Position Switch
MalfunctionShort in park/neutral position switch circuit
Park/neutral position switch
ECM
Page 769 of 1897
DI02C-06
Mechanical System Test
P. DI-160NG
Customer Problem Analysis Vehicle Brought to Workshop
Check DTC and Freeze Frame Data (Pre-check)Items inside
P. DI-159are titles of pages in this manual, with the
page number indicated in the bottom portion. See the indicated
pages for detailed explanations.
Connect an OBD II scan tool or TOYOTA hand-held tester to DLC3.
If the display shows ºUNABLE TO CONNECT TO VEHICLEº when you have connected the
scan tool / TOYOTA hand-held tester, inspect DLC3 P. DI-160
Record or Print DTC and Freeze Frame Data P. DI-160
Clear DTC and Freeze Frame Data P. DI-160
Symptom does not occur
Problem Symptom Confirmation
P. DI-160 Symptom Simulation
Symptom occurs
P. DI-160 OK Code
DTC Check
P. DI-160
DTC Chart
P. DI-172Basic Inspection
Manual Shifting TestOK
P. DI-160NG
NG
NG NG
NG OKOK
OKOK Matrix Chart of Problem Symptoms - P. DI-175
Chapter 1
(Electronic)Chapter 2
(On-V ehicle)
P. DI-175
P. DI-175Chapter 3
(Off-V ehicle)
P. DI-175
Circuit
InspectionO/D Cancel Signal Check
O/D Main Switch & O/D OFF Indicator Light Check
P. DI-203 to DI-206
Identification of ProblemParts Inspection
End
Confirmation Test
Repair Setting the Check Mode Diagnosis P. DI-160 Visual Inspection1
5
9
16 2
6
10
15 3
7
11
14 4
8
12
13
17
DI-158
- DIAGNOSTICSAUTOMATIC TRANSAXLE
314 Author: Date:
2001 AVALON (RM808U)
AUTOMATIC TRANSAXLE
HOW TO PROCEED WITH TROUBLESHOOTING
Page 770 of 1897
DI02G-06
D07229
Cruise Control ECU ECMFloor Shift:
O/D Main SwitchColumn Shift:
O/D Main Switch
DLC3
Stop Light Switch
Shift Solenoid Valve SLN
Shift Solenoid Valve Direct Clutch
Speed Sensor
Park/Neutral
Position Switch Shift Solenoid
Valve SL
- DIAGNOSTICSAUTOMATIC TRANSAXLE
DI-173
329 Author: Date:
2001 AVALON (RM808U)
PARTS LOCATION
Page 771 of 1897
DI02E-08
FI0534
F07887DLC3
TOYOTA hand-held tester
DI-160
- DIAGNOSTICSAUTOMATIC TRANSAXLE
316 Author: Date:
2001 AVALON (RM808U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Description
When troubleshooting OBD II vehicles, the only dif-
ference from the usual troubleshooting procedure
is that you connect to the vehicle an OBD II scan
tool complying with SAE J1987 or TOYOTA hand-
held tester, and read off various data output from
the vehicle's ECM.
OBD II regulations require that the vehicle's on-
board computer lights up the Malfunction Indicator
Lamp (MIL) on the instrument panel when the com-
puter detects a malfunction in the computer itself or
in drive system components which affect vehicle
emissions. In addition to the MIL lighting up when
a malfunction is detected, the applicable DTCs pre-
scribed by SAE J2012 are recorded in the ECM
memory (See page DI-14).
If the malfunction only occurs in 3-trip, the MIL goes
off but the DTCs remain recorded in the ECM
memory.
To check the DTCs, connect an OBD II scan tool or
TOYOTA hand-held tester to DLC3 on the vehicle.
The OBD II scan tool or TOYOTA hand-held tester
also enables you to erase the DTCs and check
freeze frame data and various forms of engine data
(For instruction book).
DTCs include SAE controlled codes and Manufac-
turer controlled codes.
SAE controlled codes must be set as prescribed by
the SAE, while Manufacturer controlled codes can
be set freely by the manufacturer within the pre-
scribed limits (See DTC chart on page ).
