1996 TOYOTA TERCEL check engine

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.

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.

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

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

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

F00414
24ABS ECU
AA123DLC1
Ts
16
EC
E1TsL
B-RAEA13
B-RL12 V
J/C
J1
R13006
E1
DLC1
Tc
- DIAGNOSTICSANTI-LOCK BRAKE SYSTEM
DI-143
1996 TERCEL (RM440U)
Ts Terminal Circuit
CIRCUIT DESCRIPTION
The sensor check circuit detects abnormalities in the speed sensor signal which cannot be detected with
the DTC check.
Connecting terminals Ts and E
1 of the DLC1 in the engine compartment starts the check.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and E1 of DLC1.
CHECK:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals Ts and E
1 of the
DLC1.
OK:
Voltage: 10 - 14 V
OK If ABS warning light does not blink even after Ts
and E
1 are connected, ECU may be defective.
NG
DI4M1-02