TOYOTA TERCEL 1996 Service Repair Manual

A15740
DI-106
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
A/C Cut Control Circuit
CIRCUIT DESCRIPTION
This circuit cuts air conditioning operation during vehicle acceleration in order to increase acceleration per-
formance. During acceleration with the vehicle speed at 25 km/h (16 mph) or less, engine speed at 1,200
rpm or less and throttle valve opening angle at 50° or more, the A/C magnet switch is turned OFF for several
seconds.
WIRING DIAGRAM
INSPECTION PROCEDURE
TOYOTA hand-held tester:
1 Connect TOYOTA hand-held tester and check operation of air conditioning cut
control.
PREPARATION:
(a) Remove the fuse cover on the instrument panel.
(b) Connect the TOYOTA hand-held tester to the DLC3.
(c) Turn ignition switch ON and TOYOTA hand-held tester main switch ON.
(d) Start the engine and air conditioning switch ON.
HINT:
A/C magnet clutch is turned ON.
(e) Select the ACTIVE TEST mode on the TOYOTA hand-held tester.
CHECK:
Check operation of A/C magnet clutch cut when air conditioning cut control is operated by the TOYOTA
hand-held tester.
OK:
A/C magnet clutch is turned OFF
OK Proceed to next circuit inspection shown on
matrix chart (See page DI-19).
DI1EK-09

A15741
START
ACT (+)
- DIAGNOSTICSENGINE
DI-107
1996 TERCEL (RM440U)
NG
2 Check for open and short in harness and connector between ECM and A/C am-
plifier (See page IN-26).
NG Repair or replace harness or connector.
OK
3 Check voltage between terminal ACT of ECM and body ground.
PREPARATION:
(a) Remove the lower finish panel.
(b) Start the engine.
CHECK:
Measure the voltage between terminal ACT of the ECM con-
nector and the body ground when A/C switch is turned to ON
and OFF.
OK:
A/C switch conditionVoltage
ON9 - 14 V
OFFBelow 2.0 V
NG Check and replace A/C amplifier.
OK
Check and replace ECM (See page IN-26).
OBD II scan tool (excluding TOYOTA hand-held tester):
1 Check voltage between terminal ACT of ECM connector and body ground (See
page DI-106, step 3).
OK Check and repair ECM (See page IN-26).
NG

DI-108
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
2 Check for open and short in harness and connector between ECM and A/C am-
plifier (See page IN-26).
NG Repair or replace harness or connector.
OK
Check and replace A/C amplifier.

DI4LN-02
Vehicle Brought to Workshop
Customer Problem Analysis
P. DI-1 10
Check and Clear DTC (Pre-check)
P.
DI-1 11
Items inside
are titles of pages in this manual,
with the page number in the bottom portion. See
the indicated pages for detailed explanations.
Problem Symptom ConfirmationSymptom Simulation
P. IN-26
Symptom
does not occur
Symptom
occurs
DTC Check
P. DI-1 11
Sensor CheckCircuit Inspection
P. DI-1 19 - DI-145
DTC Chart
P. DI-1 15Problem Symptoms Table
P. DI-1 18
Check for Fluid Leakage
P. DI-145
Identification of Problem
Normal code
Repair
Confirmation Test
End
1
2
3
4
5
67
89
10
11
Step 8:Diagnostic steps permitting the use of the
TOYOTA hand-held tester, or TOYOTA
brake-out-box.
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-109
283 Author
: Date
:
1996 TERCEL (RM440U)
ANTI-LOCK BRAKE SYSTEM
HOW TO PROCEED WITH TROUBLESHOOTING
Troubleshooting in accordance with the procedure on the following pages.

DI4LO-01
ABS Check SheetInspector 's
Name:
Customer 's Name
Date Vehicle
Brought InRegistration Year Registration No.
Frame No.
Odometer Reading/ /
/ /
Date Problem First Occurred
Frequency Problem Occurs/ /
ContinuousIntermittent ( times a day)
Remains ONDoes not Light Up
DTC Check1st Time
2nd TimeNormal Code
Malfunction Code (Code )
Normal CodeMalfunction Code (Code )
Symptomskm
miles
ABS does not operate.
ABS Warning Light
AbnormalABS does not operate intermittently. DI-1 10
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
CUSTOMER PROBLEM ANALYSIS CHECK

R12149
DI4LP-02
FI6443
Short Pin
DLC1
R13006
DLC1
E
1
Tc
R01346
Normal Code
0.25 sec.
0.25 sec.
ON
OFF
ON
OFF0.5 sec.
Code 11 and 21
4 sec.1.5
sec.2.5 sec.
Code 11Code 21
2 sec.
0.5 sec.
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-1 11
1996 TERCEL (RM440U)
PRE-CHECK
1. DIAGNOSIS SYSTEM
(a) Check the indicator.
When the ignition switch is turned ON, check that the ABS
warning light goes on for 3 seconds.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting for the ABS warning light circuit (See page DI-138).
(b) Check the DTC.
(1) Turn the ignition switch ON.
(2) Disconnect the short pin from the DLC1.
(3) Using SST, connect terminals Tc and E
1 of the
DLC1.
SST 09843-18020
(4) Read the DTC from the ABS warning light on the
combination meter.
HINT:

If no code appears, inspect the diagnostic circuit or ABS
warning light circuit (See page DI-141 or DI-138).

As an example, the blinking patterns for normal code and
codes 11 and 21 are shown in the illustration.
(5) Code are explained in the code table on page
DI-1 15.
(6) After completing the check, disconnect terminals Tc
and E
1, and turn off the display.
If 2 or more malfunctions are indicated at the same time, the
lowest numbered DTC will be displayed 1st.

BR3890
FI6443
Short Pin
DLC1
N09348
Interface Box
Harness VehicleTOYOTA
Tester Hand-held
TOYOTA Break-out-box DI-1 12
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
(c) Clear the DTC.
(1) Using SST, connect terminals Tc and E
1 of the
DLC1 and remove the short pin from the DLC1.
SST 09843-18020
(2) IG switch ON.
(3) Clear the DTC stored in ECU by depressing the
brake pedal 8 or more times within 3 seconds.
(4) Check that the warning light shows the normal
code.
(5) Remove the SST from the terminals of the DLC1.
SST 09843-18020
(6) Connect the short pin to the DLC1.
HINT:
Cancellation can also be done by removing the DOME fuse , but
in this case, other memory systems will also be cancelled out.
(d) Using TOYOTA break-out-box and TOYOTA hand-held
tester, measure the ECU terminal values.
(1) Hook up the TOYOTA hand-held tester and TOYO-
TA break-out-box to the vehicle.
(2) Read the ECU input/output values by following the
prompts on the tester screen.
HINT:
TOYOTA hand-held tester has a ºSnapshot º function. This re-
cords the measured values and is effective in the diagnosis of
intermittent problems.
Please refer to the TOYOTA hand-held tester/TOYOTA break
out-box operators manual for further details.

R13006
DLC1
E
1
TcTs
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
DI-1 13
1996 TERCEL (RM440U)
2. SPEED SENSOR SIGNAL CHECK
(a) Check the speed sensor signal.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and E
1 of the
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-138).
(5) Drive the 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 the
DLC1.
SST 09843-18020
(8) Read the number of blinks of the ABS warning light.
HINT:
See the list of DTCs 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 terminals Ts and
E
1, and Tc and E1 of the DLC1, and turn ignition
switch OFF.

DI-1 14
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
(b) Check the DTC of speed sensor function.
Code No.DiagnosisTrouble Area
71Low output voltage of right front speed sensor
Right front speed sensor

Sensor installation
72Low output voltage of left front speed sensor
Left front speed sensor

Sensor installation
73Low output voltage of right rear speed sensor
Right rear speed sensor

Sensor installation
74Low output voltage of left rear speed sensor
Left rear speed sensor

Sensor installation
75Abnormal change in output voltage of right front speed sen-
sor
Right front speed sensor rotor
76Abnormal change in output voltage of left front speed sen-
sor
Left front speed sensor rotor
77Abnormal change in output voltage of right rear speed sen-
sor
Right rear speed sensor rotor
78Abnormal change in output voltage of left rear speed sensor
Left rear speed sensor rotor

DI4LQ-02
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-1 15
1996 TERCEL (RM440U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Using SST 09843-18020, connect the terminals Tc and E
1, and remove the short pin.
If a malfunction code is displayed during the DTC check, check the circuit listed for that 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-1 19)Open circuit in ABS control (solenoid) relay circuit

ABS control (solenoid) relay

Open or short in ABS control (solenoid) relay circuit

ECU
12
(DI-1 19)Short circuit in ABS control (solenoid) relay circuit

ABS control (solenoid) relay

B+ short in ABS control (solenoid) relay circuit

ECU
13
(DI-122)Open circuit in ABS control (motor) relay circuit

ABS control (motor) relay

Open or short in ABS control (motor) relay circuit

ECU
14
(DI-122)Short circuit in ABS control (motor) relay circuit

ABS control (motor) relay

B+ short in ABS control (motor) relay circuit

ECU
21
(DI-125)Open or short circuit in solenoid circuit for right front wheel

ABS actuator

Open or short in SFR circuit

ECU
22
(DI-125)Open or short circuit in solenoid circuit for left front wheel

ABS actuator

Open or short in SFL circuit

ECU
23
(DI-125)Open or short circuit in solenoid circuit for right rear wheel

ABS actuator

Open or short in SRR circuit

ECU
24
(DI-125)Open or short circuit in solenoid circuit for left rear wheel

ABS actuator

Open or short in SRL circuit

ECU
31
(DI-128)Right front wheel speed sensor signal malfunction
32
(DI-128)Left front wheel speed sensor signal malfunction
Right front, left front, right rear or left rear speed sensor
O htihd iit33
(DI-128)Right rear wheel speed sensor signal malfunction

Open or short in each speed sensor circuit

ECU
34
(DI-128)Left rear wheel speed sensor signal malfunction
41
(DI-132)Low battery positive voltage or abnormally high battery positive
voltage

Battery

IC regulator

Open or short in power source circuit

ECU
51
(DI-135)Pump motor is locked
Open in pump motor ground
ABS pump motor
Always ONMalfunction in ECU
ECU