check engine TOYOTA TERCEL 1996 Service Manual Online

A15731
P24793
- DIAGNOSTICSENGINE
DI-95
1996 TERCEL (RM440U)
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check park/neutral position switch.
PREPARATION:
Disconnect the park/neutral position switch connector.
CHECK:
Check continuity between each terminal shown below when the
shift lever is positioned to each range.
OK:
Shift PositionTerminal No. to continuity
P4 - 75 - 6
R4 - 8-
N4 - 105 - 6
D4 - 9-
22 - 4-
L3 - 4-

A15733
DI-96
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
NG Replace park/neutral position switch.
OK
2 Check voltage between terminal NSW of ECM connector and body ground.
PREPARATION:
(a) Remove the lower finish panel.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminal NSW of the ECM con-
nector and the body ground after the shift lever is moved to the
following positions.
Shift lever positionP or NL, 2, D or R
Voltage0 - 3 V9 - 14 V
OK Check and replace ECM (See page IN-26).
NG
Check for open and short in harness and con-
nector between ECM and park/neutral posi-
tion switch (See page IN-26).

A15735
DI-98
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
1 Check voltage between terminals +B and E1 of ECM connector.
PREPARATION:
(a) Remove the lower finish panel.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between terminals +B and E1 of the ECM
connectors.
OK:
Voltage: 9 - 14 V
OK Proceed to next circuit inspection shown on
matrix chart (See page DI-19).
NG
2 Check for open in harness and connector between terminal E1 of ECM and body
ground (See page IN-26).
NG Repair or replace harness or connector.
OK
3 Check EFI main relay (Marking: EFI) (See page MF-38).
NG Replace EFI main relay.
OK
4 Check EFI fuse (See page DI-92, step 2).
NG Check for short in all harness and components
connected to EFI fuse.
OK

- DIAGNOSTICSENGINE
DI-99
1996 TERCEL (RM440U)
5 Check for open in harness and connector between EFI main relay (Marking: EFI)
and battery, EFI main relay (Marking: EFI) and ECM (See page IN-26).
NG Repair or replace harness or connector.
OK
6 Check IGN fuse of driver side J/B.
NG Check for short in all harness and components
connected to IGN fuse.
OK
7 Check ignition switch (See page BE-1 1).
NG Replace ignition switch.
OK
Check for open in harness and connector between ignition switch and EFI main relay, EFI main
relay and body ground (See page IN-26).

A15737
DI-102
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
INSPECTION PROCEDURE
TOYOTA hand-held tester:
1 Connect TOYOTA hand-held tester and check operation of fuel pump
(See page MF-1).
OK Check for starter signal circuit.
NG
2 Check for ECM power source circuit (See page DI-97).
NG Repair or replace.
OK
3 Check circuit opening relay (See page MF-40).
NG Replace circuit opening relay.
OK
4 Check voltage between terminal FC of ECM and body ground.
PREPARATION:
(a) Remove the lower finish panel.
(b) Turn ignition switch ON.
CHECK:
Measure voltage between terminal FC of ECM and body
ground.
OK:
Voltage: 9 - 14 V
NG Check for open in harness and connector be-
tween EFI main relay and circuit opening relay,
circuit opening relay and ECM.
OK

A15739
- DIAGNOSTICSENGINE
DI-103
1996 TERCEL (RM440U)
5 Check fuel pump (See page MF-1).
NG Repair or replace fuel pump.
OK
6 Check for open in harness and connector between circuit opening relay and fuel
pump, fuel pump and body ground (See page IN-26).
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-26).
OBD II scan tool (excluding TOYOTA hand-held tester):
1 Check fuel pump operation.
PREPARATION:
(a) Remove the lower finish panel.
(b) Turn the ignition switch ON.
CHECK:
(a) Connect terminal FC of the ECM and the body ground to-
gether.
(b) Check for fuel pressure in the fuel inlet hose when it is
pinched off.
OK:
There is pressure in the inlet hose
HINT:
At this time, you will hear a fuel flowing noise.
OK Check for starter signal circuit.

DI-104
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
NG
2 Check for ECM power source circuit (See page DI-97).
NG Repair or replace.
OK
3 Check circuit opening relay (See page MF-40).
NG Replace circuit opening relay.
OK
4 Check voltage between terminal FC of ECM connector and body ground.
(See page DI-100)
NG Check for open in harness and connector be-
tween EFI main relay and circuit opening relay,
circuit opening relay and ECM.
OK
5 Check fuel pump (See page MF-1).
NG Repair or replace fuel pump.
OK
6 Check for open in harness and connector between circuit opening relay and fuel
pump, fuel pump and body ground (See page IN-26).

- DIAGNOSTICSENGINE
DI-105
1996 TERCEL (RM440U)
NG Repair or replace harness or connector.
OK
Check and replace ECM (See page IN-26).

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