Page 2896 of 4770
AT5608
0
1
Electric Current (A)
High
Accumulator Control Pressure
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
D000621 msec./div.5 V/div.
GND Reference
Waveform between terminals SLN
+
and SLN± when engine is idling.Waveform between terminals SLN
+
and SLN± when during shift change.
1 msec./div.5 V/div.
GND DI±476
± DIAGNOSTICSAUTOMATIC TRANSAXLE (A541E)
711 Author: Date:
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 flow 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±02
Page 2911 of 4770
DI03A±02
Vehicle Brought to Workshop
Customer Problem Analysis
P. DI±492
Check and Clear DTC (Precheck)
P.
DI±493
Items inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the pages for detailed explanations.
Problem Symptom ConfirmationSymptom Simulation
P. IN±21
Symptom
does not occur
Symptom
occurs
DTC Check
P. DI±493
Sensor CheckCircuit Inspection
P. DI±502 ~ DI±534
DTC Chart
P. DI±497 Malfunction codeProblem Symptoms Table
P. DI±501
Check for Fluid Leakage
P. DI±536
Identification of Problem
Normal code
Repair
Confirmation Test
End
1
2
3
4
5
67
89
10
11
Step 2, 5, 8, 9, 11:Diagnostic steps permitting the use of the
TOYOTA hand±held tester or TOYOTA
break±out±box.
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (DENSO Made)
DI±491
726 Author: Date:
ANTI±LOCK BRAKE SYSTEM (DENSO Made)
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshoot in accordance with the procedure on the following pages.
Page 2915 of 4770
F02201
DLC1
TsTc E1
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
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (DENSO Made)
DI±495
730 Author: Date:
2. SPEED SENSOR SIGNAL
(a) Check the speed 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±529).
(5) Drive vehicle straight forward.
HINT:
Drive vehicle faster than 45 km/h (28 mph) for several seconds.
(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 malfunctions are indicated 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 igni-
tion switch OFF.
SST 09843 ± 18020
Page 2916 of 4770
H07517
TOYOTA
Hand±held Tester
DLC2 DI±496
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (DENSO Made)
731 Author: Date:
(b) Using TOYOTA hand±held tester, check the DTC.
(1) Do step 1. ~ 6. on the previous page.
(2) Hook up the TOYOTA hand±held tester to the
DLC2.
(3) Read the DTC by following the prompts on the tes-
ter screen.
Please refer to the TOYOTA hand±held tester oper-
ator 's manual for further details.
DTC of speed sensor check function:
Code No.DiagnosisTrouble Area
71Low output voltage of right front speed sensor
Right front speed sensor
Sensor installation
Right front speed sensor rotor
72Low output voltage of left front speed sensor
Left front speed sensor
Sensor installation
Left front speed sensor rotor
73Low output voltage of right rear speed sensor
Right rear speed sensor
Sensor installation
Right rear speed sensor rotor
74Low output voltage of left rear speed sensor
Left rear speed sensor
Sensor installation
Left rear speed sensor rotor
75Abnormal change in output voltage of right front speed sen-
sorRight front speed sensor rotor
76Abnormal change in output voltage of left front speed
sensorLeft front speed sensor rotor
77Abnormal change in output voltage of right rear speed
sensorRight rear speed sensor rotor
78Abnormal change in output voltage of left rear speed sensorLeft rear speed sensor rotor
Page 2917 of 4770
DI03D±03
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (DENSO Made)
DI±497
732 Author: Date:
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843 ±18020, connect the terminals Tc and E1, and remove the short pin.
If any abnormality is not found when inspection parts, inspect the ECU.
If a malfunction code is displayed during the DTC check, check the circuit listed for the code. For details
of each code, turn to the page referred to under the ºSee pageº for respective ºDTC No.º in the DTC
chart.
DTC No.
(See Page)Detection ItemTrouble Area
11
(DI±502)Open circuit in ABS solenoid relay circuitABS solenoid relay
12
(DI±502)Short circuit in ABS solenoid relay circuit
ABS solenoid relay
ABS solenoid relay circuit
13
(DI±507)Open circuit in ABS motor relay circuitABS motor relay
14
(DI±507)Short circuit in ABS motor relay circuit
ABS motor relay
ABS motor relay circuit
21
(DI±511)Open or short circuit in 2±position solenoid circuit for right front
wheelABS actuator
SFRR or SFRH circuit
22
(DI±511)Open or short circuit in 2±position solenoid circuit for left front
wheelABS actuator
SFLR or SFLH circuit
23
(DI±511)Open or short circuit in 2±position solenoid circuit for right rear
wheelABS actuator
SRRR or SRRH circuit
24
(DI±511)Open or short circuit in 2±position solenoid circuit for left rear
wheelABS actuator
SRLR or SRLH circuit
31
(DI±514)Right front wheel speed sensor signal malfunction
32
(DI±514)Left front wheel speed sensor signal malfunctionRight front, left front, right rear and left rear speed sensor
Eh d i it33
(DI±514)Right rear wheel speed sensor signal malfunction
Each speed sensor circuit
Speed sensor rotor
34
(DI±514)Left rear wheel speed sensor signal malfunction
33, 34
(DI±519)Rear speed sensor rotor faulty
Rear axle hub
Right rear, left rear speed sensor
Rear speed sensor circuit
41
(DI±520)Power source voltage down
Battery
Charging system
Power source circuit
49
(DI±523)Open circuit in stop light switch circuitStop light switch
Stop light switch circuit
51
(DI±525)Pump motor is lockedABS pump motor
Always ON
(DI±527)Malfunction in ECUECU
Battery
Page 2918 of 4770
DI03E±03
F01172
Sensor Rotor
ABS Warning Light
ABS ECU
DLC 1
Front Speed Sensor
ABS Actuator
ABS Solenoid
Relay
ABS Motor Relay
Sensor RotorFront Speed
Sensor
Stop Light SwitchDLC 2
Rear Speed Sensor DI±498
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (DENSO Made)
733 Author: Date:
PARTS LOCATION
Page 2921 of 4770
DI03G±04
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (DENSO Made)
DI±501
736 Author: Date:
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
SymptomSuspect AreaSee page
ABS does not operate
Only when 1. to 4. are all normal and the problem is still
occurring, replace the ABS ECU.
13.Check the DTC reconfirming that the normal code is
output.
14.IG power source circuit.
15.Speed sensor circuit.
16.Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage
(See page DI±536).
DI±493
DI±520
DI±514
BR±50
ABS does not operate efficiently
Only when 1. to 4. are all normal and the problem is still
occurring, replace the ABS ECU.
1. Check the DTC reconfirming that the normal code is
output.
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the ABS actuator with a checker.
If abnormal, check the hydraulic circuit for leakage
(See page DI±536).
DI±493
DI±514
DI±523
BR±50
ABS warning light abnormal1. ABS warning light circuit
2. ABS ECUDI±529
DI±527
DTC check cannot be done
Only when 1. and 2. are all normal and the problem is still
occurring, replace the ABS ECU.
1. ABS warning light circuit
2. Tc terminal circuit
DI±529
DI±532
Speed sensor signal check cannot be done1. Ts terminal circuit
2. ABS ECUDI±534
DI±527
Page 2934 of 4770
BR3583
BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
+V
±VHigh Speed
Low Speed
CoilNS
DI±514
± DIAGNOSTICSANTI±LOCK BRAKE SYSTEM (DENSO Made)
749 Author: Date:
DTC31, 32, 33, 34Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
the ABS system. The front and rear rotors each have 48 serra-
tions.
When the rotors rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.
DTC No.DTC Detecting ConditionTrouble Area
31, 32, 33, 34
Detection of any of conditions from 1. through 4.:
1. Vehicle speed is at 10 km/h (6 mph) or more and the
speed sensor signal circuit is open or short circuit con-
tinues for 15 sec. or more.
2. Momentary interruption of the speed sensor signal oc-
curs 7 times or more.
3. Vehicle speed is at 20 km/h (12mph) or more and inter-
ference on the speed sensor signal continues for 5 sec.
or more.
4. Open circuit condition of the speed sensor signal circuit
continues for 0.5 sec. or more.
Right front, left front, right rear, left rear speed sensor
Each speed sensor circuit
Speed sensor rotor
HINT:
DTC No. 31 is for the right front speed sensor.
DTC No. 32 is for the left front speed sensor.
DTC No. 33 is for the right rear speed sensor.
DTC No. 34 is for the left rear speed sensor.
Fail safe function:
If trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS solenoid relay and prohibits
ABS control.
DI1JM±02
