ALT TOYOTA TERCEL 1996 Service User Guide

P18349
- DIAGNOSTICSENGINE
DI-43
1996 TERCEL (RM440U)
3 Check output voltage of oxygen sensor during idling.
PREPARATION:
Warm up the oxygen sensor with the engine at 2,500 rpm for approximately 90 seconds.
CHECK:
Using the OBD II scan tool or TOYOTA hand-held tester, read the output voltage of the oxygen sensor during
idling.
OK:
Oxygen sensor output voltage:
Alternates repeatedly between approx. 0.4 V and approx. 0.55 V (See these table):
OK Perform confirmation driving pattern.
(See page DI-41)
NG
Replace oxygen sensor.

DI-46
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
3 Check output voltage of heated oxygen sensor (bank 1 sensor 2).
PREPARATION:
(a) Remove the fuse cover on the instrument panel.
(b) Connect the OBD II scan tool or TOYOTA hand-held tester to the DLC3.
(c) After warming up the engine, race the engine at 2,500 rpm for 3 minutes.
CHECK:
Read the output voltage of the heated oxygen sensor (bank 1 sensor 2) when racing the engine after 3 min-
utes have elapsed.
OK:
Heated oxygen sensor output voltage: Alternates from 0.4 V or less to 0.5 V or more.
OK Check that each connector is properly
connected.
NG
Replace heated oxygen sensor.

DI4LU-03
W00704
ABS
EA2 2
DLC1 F71
F63
5
MAIN FL
BatteryEngine Room R/B
L
4
12
21L
A6
A71
2
A7A6
A6
A7 6
2
A6
A71Motor Relay
EB
7
ABS ECU
G-R
L-B
G-B
W-B
W-B
EA
A5
A5A5
A5
A5 12
4
3
5LG
LG-B ABS ECU L-WR+MR
A12
A12
A12
A12SR
AST
MT 4
20
8
26
ABS
EA2 2
F71
ALT
F63
5
MAIN FL
BatteryEngine Room R/B
4
1 B-Y
B2
LA6
A71
2
A7A6
A6
A7 6
A6
A7Solenoid
RelayMotor Relay ABS Control Relay
7
G-R
L-B
G-B W-B
W-B
W-B
W-B W-B
A5
A5A5
A5
A5 12
4
LG
LG-B
ABS ActuatorR+MR
SR
AST
MT 4
20
26 Fuse
BlockA12
B-Y2
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-1 19
1996 TERCEL (RM440U)
CIRCUIT INSPECTION
DTC 11, 12 ABS Control (Solenoid) Relay Circuit
CIRCUIT DESCRIPTION
This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is
OK, the relay goes on.
DTC No.DTC Detecting ConditionTrouble Area
11
Conditions 1 and 2 continue for 0.2 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage:
Battery positive voltage
2. ABS control (solenoid) relay monitor terminal (AST) volt-
age: 0 V

ABS control (solenoid) relay

Open or short in ABS control (solenoid) relay circuit

ECU
12
Conditions 1 and 2 continue for 0.2 sec. or more:
1. ABS control (solenoid) relay terminal (SR) voltage: 0 V
2. ABS control (solenoid) relay monitor terminal (AST) volt-
age: Battery positive voltage
ABS control (solenoid) relay

B+ short in ABS control (solenoid) relay circuit

ECU
Fail safe function:
If trouble occurs in the ABS control (solenoid) relay circuit, the ECU cuts off current to the ABS control (sole-
noid) relay and prohibits ABS control.
WIRING DIAGRAM

W00704
ABS
EA2 2
DLC1 F71
F63
5
MAIN FL
BatteryEngine Room R/B
L
4
12
21L
A6
A71
2
A7A6
A6
A7 6
2
A6
A71Motor Relay
EB
7
ABS ECU
G-R
L-B
G-B
W-B
W-B
EA
A5
A5A5
A5
A5 12
4
3
5LG
LG-B ABS ECU L-WR+MR
A12
A12
A12
A12SR
AST
MT 4
20
8
26
ABS
EA2 2
F71
ALT
F63
5
MAIN FL
BatteryEngine Room R/B
4
1 B-Y
B2
LA6
A71
2
A7A6
A6
A7 6
A6
A7Solenoid
RelayMotor Relay ABS Control Relay
7
G-R
L-B
G-B W-B
W-B
W-B
W-B W-B
A5
A5A5
A5
A5 12
4
LG
LG-B
ABS ActuatorR+MR
SR
AST
MT 4
20
26 Fuse
BlockA12
B-Y2 DI-122
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
DTC 13, 14 ABS Control (Motor) Relay Circuit
CIRCUIT DESCRIPTION
The ABS control (motor) relay supplies power to the ABS pump motor. While the ABS is activated, the ECU
switches the ABS control (motor) relay on and operates the ABS pump motor.
DTC No.DTC Detecting ConditionTrouble Area
13
Conditions 1 and 2 continue for 0.2 sec. or more:
1. ABS control (motor) relay terminal (MR) voltage:
Battery positive voltage
2. ABS control (motor) relay monitor terminal (MT) voltage:
0 V

ABS control (motor) relay

Open or short in ABS control (motor) relay circuit

ECU
14
Conditions 1 and 2 continued for 4 sec. or more:
1. ABS control (motor) relay terminal (MR) voltage: 0 V
2. ABS control (motor) relay monitor terminal (MT) voltage:
Battery positive voltage
ABS control (motor) relay

B+ short in ABS control (motor) relay circuit

ECU
Fail safe function:
If trouble occurs in the ABS control (motor) relay circuit, the ECU cuts off the current to the ABS control (sole-
noid) relay and prohibits ABS control.
WIRING DIAGRAM
DI4LV-03

W00705F15132
22
1 2ABS
Battery
B-Y
B
Fuse
Block
W-B
EA
EB
1
W-B
11
W-B
2
2 5
4 L
66
14
DLC1
ABS Control
Relay
Solenoid
Relay
P
R-B
R-W
L-W
G-Y
ABS ECUABS ECU
7 3
8 4
5 1
121 2
SFLR
SFLH
SFRR
SFRH
SRRR
SRRH A6
A5A13
A7 A7
A7
A6A13
A12
A12
A12
A12
Y-R
F7Y
F6Engine Room R/B
L
W-B
W-B
SRLR SRLH A13
A13
B-R
1ABS ECU
ABS ECU
ABS ECU
A4
A4
A4
A4
A4
A4
A4
A4
A5
A56Y
Y
Y-R
Y-R
Y-B Y-B
5
2
15
11
MAIN
FL
ALT
EA2
IC2IE1
IE1 IC2
IC2IE1
IE1 IC2
6
1
14
2
5
43
13 2
ABS Actuator LMotor
Relay
2
G-Y
Y-B
G-Y
Monitor
L-WL-R
R14675
4321
5 6 7 8
4
A5 A4
4321
5 6 7 8
4
A5 A4
4321
5 6 7 8
4
A5 A4
4321
5 6 7 8
4
A5 A4
4321
5 6 7 8
4
A5 A44321
5 6 7 8
4
A5 A4
DI-126
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check ABS actuator solenoid.
PREPARATION:
Disconnect the 2 connectors from the ABS actuator.
CHECK:
Check the continuity between terminals A5-4 and A4-1, 2, 3,
4, 5, 6, 7, 8 of the ABS actuator connector.
OK:
Continuity
HINT:

Resistance of each of the solenoids SFRH, SFLH, SRRH
and SRLH is 5.0 W.

Resistance of each of the solenoids SFRR, SFLR, SRRR
and SRLR is 2.2 W.
NG Replace ABS actuator.
OK

W00706
Battery MAIN FLECU-IG
4
1Ignition Switch
2A12
7
GND
EA21J
1L-R
F6
F7B
B-YB-Y
5 B
IG1
W-B 2 2 1 2
W-B W-G2
1
1B Driver Side J/B
W-G
2Driver Side J/B
1B1K
2
2 B
Junction
Connector
B-Y
W-B W-B
GND A13
A1310 21
Battery MAIN FLECU-IG
4
1Ignition Switch
2A12
7
GND
EA21J
1L-R
F6
F7B
B-YB-Y
5 B
IG1
W-B 2 2 1 2
W-B W-G2
1
1B Driver Side J/B
W-G
2Driver Side J/B
1B1K
2
2 BJunction
Connector
B-Y
W-B W-B
GND A13
A1310 21
Battery MAIN FLECU-IG
4
1Ignition Switch
2A12
7
GND
EA21J
1L-R
F6
F7B
B-YB-Y
5 B
IG1
W-B 2 2 1 2
W-B W-G2
1
1B Driver Side J/B
W-G
2Driver Side J/B
1B1K
2
2 BJunction
Connector
B-Y
W-B W-B
GND A13
A1310 21
Battery MAIN FLECU-IG
4
1Ignition Switch
2A12
7
GND
EA21J
1L-R
F6
F7B
B-YB-Y
5 B
IG1
W-B Fuse
Block
2 1 2
W-B W-G2
1
1B Driver Side J/B
W-G
2Driver Side J/B
1B1K
2
2 BJunction
Connector
B-Y
W-B W-B
GND A13
A1310 21
Battery MAIN FLECU-IG
4
1Ignition Switch
2A12
7
GND
EA21J
1L-R
F6
F7B
B-YB-Y
5 B
IG1
W-B
ALT
B-Y
2 1 2
AM1
W-B W-G2
1
1B Driver Side J/B
W-G
2Driver Side J/B
1B1K
2
2 B
Junction
Connector
B-Y
W-B W-B
GND A13
A1310 21
BH
BG
Engine Room R/BEngine Room R/BABS ECU DI-132
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
DTC 41 IG Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the ECU and, hence the CPU and the actuators.
DTC No.DTC Detecting ConditionTrouble Area
41
Vehicle speed is 3 km/h (1.9 mph) or more and voltage of
ECU terminal IG1 remains at more than 17 V or below 9.5
V for more than 10 sec.
Battery

IC regulator

Open or short in power source circuit

ECU
Fail safe function:
If trouble occurs in the power source circuit, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
WIRING DIAGRAM
DI4R7-03

W00704
ABS
EA2 2
DLC1 F71
F63
5
MAIN FL
BatteryEngine Room R/B
L
4
12
21L
A6
A71
2
A7A6
A6
A7 6
2
A6
A71Motor Relay
EB
7
ABS ECU
G-R
L-B
G-B
W-B
W-B
EA
A5
A5A5
A5
A5 12
4
3
5LG
LG-B ABS ECU L-WR+MR
A12
A12
A12
A12SR
AST
MT 4
20
8
26
ABS
EA2 2
F71
ALT
F63
5
MAIN FL
BatteryEngine Room R/B
4
1 B-Y
B2
LA6
A71
2
A7A6
A6
A7 6
A6
A7Solenoid
RelayMotor Relay ABS Control Relay
7
G-R
L-B
G-B W-B
W-B
W-B
W-B W-B
A5
A5A5
A5
A5 12
4
LG
LG-B
ABS ActuatorR+MR
SR
AST
MT 4
20
26 Fuse
BlockA12
B-Y2
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-135
1996 TERCEL (RM440U)
DTC 51 ABS Pump Motor Lock
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
51Pump motor is not operating normally during initial check
ABS pump motor
Fail safe function:
If trouble occurs in the ABS pump motor, the ECU cuts off the current to the ABS control (solenoid) relay and
prohibits ABS control.
WIRING DIAGRAM
DI4LX-02

W03008
Battery MAIN FL
Fuse BlockALT Driver Side J/B
B 1 1
F6 F7 B-R EA2 2B-R1 1
1J 1CSTOP
G-W
BH
12ABS ECU IF12
G-R
21 Stop Light Switch
R-W
IE11
G-W
1E 1
1
1L
1K 5
G-W G-W
Stop Light
W-BA12STP Driver Side J/B
DI-136
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
1996 TERCEL (RM440U)
Stop Light Switch Circuit
CIRCUIT DESCRIPTION
This stop light switch senses whether the brake pedal is depressed or released, and sends the signal to the
ECU.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check operation of stop light.
CHECK:
Check that stop light lights up when brake pedal is depressed and turns off when brake pedal is released.
NG Repair stop light circuit (See page BE-28)
OK
DI4LY-02

H01461H04911
H05581
ABTerminal
Tc
ABOFF
Body
Ground
OFF
ON
OFF
Several
Seconds50 m sec.
50 m sec.
1 second
(± 0.5 sec.)
Tc
Body
Ground
1 second
(± 0.5 sec.)
1
23
45
N12278
DI-150
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1996 TERCEL (RM440U)
4. DTC CLEARANCE (Using diagnosis check wire)
(a) Connect the 2 service wires to terminals Tc and AB of
DLC1.
(b) Turn the ignition switch to ACC or ON and wait approx. 6
seconds.
(c) Starting with the Tc terminal, apply body ground alternate-
ly to terminal Tc and terminal AB twice each in cycles of
1.0 seconds. Confirm that body ground is absolute. Final-
ly, keep applying body ground to terminal Tc.
HINT:
When alternately grounding terminals Tc and AB, release
ground from one terminal and immediately apply it to the other
terminal within an interval of 0.2 seconds. If DTCs do not clear,
repeat the above procedure until the codes are cleared.
(d) Several seconds after doing the clearing procedure, the
SRS warning light will blink in a 50 m sec. cycle to indicate
the codes have been cleared.
5. DTC CLEARANCE (Using TOYOTA hand-held tester)
(a) Hook up the TOYOTA hand-held tester to the DLC1.
(b) Clear the DTCs by following the prompts on the tester
screen.
HINT:
Please refer to the TOYOTA hand-held tester operator's manu-
al for further details.

H09396
MAIN
FL
B
ALT
B-RB-R
2 2
Engine
Room
R/B
AM1
W-GDriver Side J/B
1
1J
1BW-G 2ACC
AM13
B-Y4
1B
1H
CIG/RADIO Driver Side J/B
G-R*1
10
ACCAirbag
Sensor
Assembly
8
*2
B-OIG2 *1
9
7
*2 2
1H 1B5
IGN B-W 6
AM2
Ignition
Switch 7 B-R 12
IC1 B-R
2
AM2
EA2 1
B*1: USA
*2: CANADA EA214
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI-177
1996 TERCEL (RM440U)
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the
voltage of the SRS to normal voltage.
The diagnosis system malfunction display for this circuit is different to other circuits-when the SRS warning
light remains lit up and the DTC is a normal code, source voltage drop is indicated.
Malfunction in this circuit is not recorded in the airbag sensor assembly and the source voltage returns to
normal, the SRS warning light automatically goes off.
DTC No.DTC Detection ConditionTrouble Area
(Normal)Source voltage drop.
Battery

Airbag sensor assembly
WIRING DIAGRAM
DI4MI-02