check engine TOYOTA TERCEL 1996 Service Repair Manual
[x] Cancel search | Manufacturer: TOYOTA, Model Year: 1996, Model line: TERCEL, Model: TOYOTA TERCEL 1996Pages: 1202, PDF Size: 17.43 MB
Page 526 of 1202
SF1PQ-02
- MFIMFI SYSTEM
MF-1
525 Author: Date:
1996 TERCEL (RM440U)
MFI SYSTEM
PRECAUTION
1. BEFORE WORKING ON FUEL SYSTEM, DISCON-
NECT NEGATIVE (-) TERMINAL CABLE FROM BAT-
TERY
HINT:
Any diagnostic trouble code retained by the computer will be
erased when the negative (-) terminal cable is disconnected.
Therefore, if necessary, read the diagnosis before disconnect-
ing the negative (-) terminal cable from the battery.
2. DO NOT SMOKE OR WORK NEAR AN OPEN FLAME
WHEN WORKING ON THE FUEL SYSTEM
3. KEEP GASOLINE AWAY FROM RUBBER OR LEATH-
ER PARTS
4. MAINTENANCE PRECAUTIONS
(a) In event of engine misfire, the following precautions
should be taken.
(1) Check proper connection to battery terminals, etc.
(2) Handle higt-tension cords carefully.
(3) After repair work, check that the ignition coil termi-
nals and all other ignition system lines are recon-
nected securely.
(4) When cleaning the engine compartment, be espe-
cially careful to protect the electrical system from
water.
(b) Precautions when handling the oxygen sensor.
(1) Do not allow the oxygen sensor to drop or hit
against an object.
(2) Do not allow the sensor to come into contact with
water.
5. IF VEHICLE IS EQUIPPED WITH MOBILE RADIO SYS-
TEM (HAM, CB, ETC.)
If the vehicle is equipped with a mobile communication system,
refer to the precaution in the IN section.
6. AIR INDUCTION SYSTEM
(a) Separation of the engine oil dipstick, oil filler cap, PCV
hose, etc. may cause the engine out of tune.
(b) Disconnection, looseness or cracks in the parts of the air
induction system between the throttle body and cylinder
head will cause air suction and cause the engine out of
tune.
7. ELECTRONIC CONTROL SYSTEM
(a) Before removing MFI wiring connectors, terminals, etc.,
first disconnect the power by either turning the ignition
switch to LOCK or disconnecting the negative (-) terminal
cable from the battery.
Page 527 of 1202
FI2553
SST
FI4429
Plug MF-2
- MFIMFI SYSTEM
526 Author: Date:
1996 TERCEL (RM440U)
(b) When installing the battery, be especially careful not to in-
correctly connect the positive (+) and negative (-) cables.
(c) Do not permit parts to receive a severe impact during re-
moval or installation. Handle all MFI parts carefully, espe-
cially the ECM.
(d) Do not be careless during troubleshooting as there are
numerous transistor circuits and contact with terminals
can cause further trouble.
(e) Do not open the ECM cover.
(f) When inspecting during rainy weather, take care to pre-
vent the entry of water. Also, when washing the engine
compartment, prevent water from getting on the MFI parts
and wiring connectors.
(g) Parts should be replaced as an assembly.
(h) Care is required when pulling out and inserting wiring con-
nectors.
(i) Release the lock and pull out the connector, pulling on the
connectors.
(j) Fully insert the connector and check that it is locked.
(k) When inspecting a connector with a volt/ohmmeter.
(l) Carefully take off the water-proofing rubber if it is a wa-
ter-proof type connector.
(m) Insert the tester probe into the connector from the wiring
side when checking the continuity, amperage or voltage.
(n) Do not apply unnecessary force to the terminal.
(o) After checking, install the water-proofing rubber securely
on the connector.
(p) Use SST for inspecting or testing the injector or its wiring
connector.
SST 09842-30070
8. FUEL SYSTEM
(a) When disconnecting the high fuel pressure line, a large
amount of gasoline will spill out, so observe these proce-
dures:
(1) Disconnect the fuel pump connector.
(2) Start the engine. After the engine has stopped on
its own, turn the ignition switch.
(3) Put a container under the connection.
(4) Slowly loosen the connection.
(5) Disconnect the connection.
(6) Plug the connection with a rubber plug.
(7) Reconnect the fuel pump connector.
Page 529 of 1202
P19552
TOYOTA Hand-Held Tester
DLC3
MF-4
- MFIMFI SYSTEM
528 Author: Date:
1996 TERCEL (RM440U)
(f) Check that there are no fuel leaks after performing main-
tenance anywhere on the fuel system.
(1) Remove the fuse cover on the instrument panel.
(2) Connect the TOYOTA hand- held tester to the
DLC3.
(3) Turn the ignition switch ON and TOYOTA hand-
held tester main switch ON.
NOTICE:
Do not start the engine.
(4) Select the active test mode on the TOYOTA hand-
held tester.
(5) Please refer to the TOYOTA hand-held tester oper-
ator 's manual for further details.
If you have no TOYOTA hand-held tester, connect the positive
(+) and negative (-) leads from the battery to the fuel pump con-
nector (See page MF-5).
(6) Pinch the fuel return hose.
(7) The pressure in the high pressure line will rise to
approx. 392 kPa (4 kgf/cm
2, 57 psi). In this state.
Check to see that there are no leaks from any part
of the fuel system.
NOTICE:
Always pinch the hose. Avoid bending as it may cause the
hose to crack.
(8) Turn the ignition switch to LOCK.
(9) Disconnct the TOYOTA hand-held tester from the
DLC3.
(10) Install the fuse cover on the instrument panel.
Page 530 of 1202
P19552
TOYOTA Hand-Held Tester
DLC3
P20392
SF1PR-02
P20176
P20391
- MFIFUEL PUMP
MF-5
529 Author: Date:
1996 TERCEL (RM440U)
FUEL PUMP
ON-VEHICLE INSPECTION
1. CHECK FUEL PUMP OPERATION
(a) Remove the fuse cover on the instrument panel.
(b) Connect the TOYOTA hand-held tester to the DLC3.
(c) Turn the ignition switch ON and TOYOTA hand-held tes-
ter main switch ON.
NOTICE:
Do not start the engine.
(d) Select the active test mode on the TOYOTA hand-held
tester.
(e) Please refer to the TOYOTA hand-held tester operator's
manual for further details.
If you have no TOYOTA hand-held tester, connect the positive
(+) and negative (-) leads from the battery to the fuel pump con-
nector (See step 6).
(f) Check that there is pressure in the fuel inlet hose from the
fuel filter.
HINT:
If there is fuel pressure, you will hear the sound of fuel flowing.
If there is no pressure, check the fusible link, H-fuse, fuses, EFI
main relay, circuit opening relay, fuel pump, ECM and wiring
connections.
2. CHECK FUEL PRESSURE
(a) Check the battery positive voltage is above 11 V.
(b) Disconnect the negative (-) terminal cable from the bat-
tery.
(c) Remove the union bolt and 2 gaskets, and disconnect the
fuel inlet hose from the fuel filter outlet.
CAUTION:
Put a shop towel under the fuel filter.Slowly loosen the
union bolt.
Page 531 of 1202
P20392
SST
MF-6
- MFIFUEL PUMP
530 Author: Date:
1996 TERCEL (RM440U)
(d) Install the fuel inlet hose and SST (pressure gauge) to the
fuel filter outlet with the 3 gaskets and union bolt.
SST 09268-45012
Torque: 29.0 N´m (290 kgf´cm, 22 ft´lbf)
(e) Wipe off any splattered gasoline.
(f) Reconnect the negative (-) terminal cable to the battery.
(g) Connect the TOYOTA hand-held tester to the DLC3 (See
step 1 check fuel pump operation (a) to (f)).
(h) Turn the ignition switch ON.
(i) Measure the fuel pressure.
Fuel pressure:
281 - 287 kPa
(2.87 - 2.93 kgf/cm
2, 40.8 - 41.7 psi)
If pressure is high, replace the fuel pressure regulator.
(j) If pressure is low, check these parts:
Fuel hoses and connection
Fuel pump
Fuel filter
Fuel pressure regulator
(k) Remove the TOYOTA hand-held tester from the DLC3.
(l) Reinstall the fuse cover on instrument panel.
(m) Start the engine.
(n) Disconnect the vacuum sensing hose from the fuel pres-
sure regulator.
(o) Measure the fuel pressure at idle.
Fuel pressure:
281 - 287 kPa (2.87 - 2.93 kgf/cm
2, 40.8 - 41.7 psi)
(p) Reconnect the vaccum sensing hose to the fuel pressure
regulator plug the hose end.
(q) Measure the fuel pressure at idle.
Fuel pressure:
226 - 265 kPa (2.3 - 2.6 kgf/cm
2, 33 - 37 psi)
If pressure is not as specified, check the vacuum sensing hose
and fuel pressure regulator.
(r) Stop the engine.
(s) Check that the fuel pressure remains as specified for 5
minutes after the engine has stopped.
Fuel pressure:
147 kPa (1.5 kgf/cm
2, 21 psi) or more
If pressure is not as specified, check the fuel pump, pressure
regulator and/or injector.
(t) After checking fuel pressure, disconnect the negative (-)
terminal cable from the battery and carefully remove the
SST to prevent gasoline from splashing.
SST 09268-45012
(u) Connect the fuel inlet hose to the fuel filter with 2 new gas-
kets and the union bolt.
Page 541 of 1202
SF0X0-03
MF-16
- MFIINJECTOR
540 Author: Date:
1996 TERCEL (RM440U)
INJECTOR
ON-VEHICLE INSPECTION
1. INSPECT INJECTOR OPERATION
Check operation sound from each injector.
(1) With the engine running or cranking, use a sound
scope to check that there is a normal operating
noise in proportion to engine speed.
(2) If you have no sound scope, you can check the
injector transmission operation with your finger.
If no sound or unusual sound is heard, check the wiring connec-
tor, injector or injection signal from the ECM.
2. INSPECT INJECTOR RESISTANCE
(a) Disconnect the injector connector.
(b) Using an ohmmeter, measure the resistance between the
terminals.
Resistance:
13.4 - 14.2 W at 20°C (68°F)
If the resistance is not as specified, replace the injector.
(c) Reconnect the injector connector.
Page 545 of 1202
Z14695
SST (Hose)
SST (Union)
O-Ring
SST
(Clamp)
Vinyl Tube
P19552
TOYOTA Hand-Held Tester
DLC3
FI3211
SST
(Wire)
Connect
FI1676
MF-20
- MFIINJECTOR
1996 TERCEL (RM440U)
(h) Install the grommet and a O-ring to the injector.
(i) Connect SST (union and hose) to the injector, and hold
the injector and union with SST (clamp).
SST 09368-41046
(j) Put the injector into the graduated cylinder.
CAUTION:
Install a suitable vinyl hose onto the injector to prevent
gasoline from splashing out.
(k) Remove the fuse cover on the instrument panel.
(l) Connect the TOYOTA hand-held tester to the DLC3.
(m) Turn the ignition switch ON and TOYOTA hand-held tes-
ter main switch ON.
NOTICE:
Do not start the engine.
(n) Select the active test mode on the TOYOTA hand-held
tester.
(o) Please refer to the TOYOTA hand-held tester operator's
manual for further details.
(p) If you have no TOYOTA hand-held tester, connect the
positive (+) and negative (-) leads from the battery to the
fuel pump connector (See page MF-5).
(q) Connect SST (wire) to the injector and battery for 15 se-
conds, and measure the injection volume with a gra-
duated cylinder. Test each injector 2 or 3 times.
SST 09842-30070
Volume:
39 - 49 cm
3 (2.4 - 3.0 cu in.) per 15 sec.
Difference between each injector:
5 cm
3 (0.3 cu in.) or less
If the injection volume is not as specified, replace the injector.
2. INSPECT LEAKAGE
(a) In the condition above, disconnect the tester probes of
SST (wire) from the battery and check the fuel leakage
from the injector.
SST 09842-30070
Fuel drop:
1 drop or less per 3 minutes
(b) Disconnect the negative (-) terminal cable from the bat-
tery.
(c) Remove the SST.
Page 547 of 1202
SF0X4-05
FI3271
New
O-Ring
New Grommet
P00159
CORRECT
WRONG
InjectorDelivery Pipe GrommetO-Ring
WRONG
P20295
Spacer
Insulator
Connector MF-22
- MFIINJECTOR
1996 TERCEL (RM440U)
INSTALLATION
1. INSTALL INJECTORS AND DELIVERY PIPE
(a) Install a new grommet to the injector.
(b) Apply a light coat of gasoline to an O-ring, and install it
to the injector.
(c) While turning the injector left and right, install it to the de-
livery pipe. Install the 4 injectors.
(d) Place the 2 spacers and 4 insulators in position on the cyl-
inder head.
(e) Place the injectors together with the delivery pipe on the
cylinder head.
(f) Check that the injectors rotate smoothly.
HINT:
If the injectors do not rotate smoothly, the probable cause is in-
correct installation of O-rings. Replace the O-rings.
(g) Position the injector connector upward.
(h) Install the 2 bolts.
Torque: 19 N´m (190 kgf´cm, 14 ft´lbf)
2. CONNECT ENGINE WIRE
(a) Connect the 4 injector connectors.
(b) Connect the engine wire to the surge tank stay.
3. CONNECT FUEL INLET HOSE TO DELIVERY PIPE
(a) Install 2 new gaskets and the inlet hose with the union
bolt.
Torque: 30 N´m (300 kgf´cm, 23 ft´lbf)
(b) Connect the engine wire clamp to the No.2 engine hang-
er.
4. CONNECT FUEL RETURN HOSE TO FUEL RETURN
PIPE
5. CONNECT VACUUM SENSING HOSE TO FUEL PRES-
SURE REGULATOR
Page 551 of 1202
SF1PW-01
MF-26
- MFITHROTTLE BODY
550 Author: Date:
1996 TERCEL (RM440U)
THROTTLE BODY
ON-VEHICLE INSPECTION
1. INSPECT THROTTLE BODY
(a) Check that the throttle linkage moves smoothly.
(b) Check the vacuum at port.
(1) Start the engine.
(2) Check the vacuum with your finger.
Port nameAt idleOther than idle
PNo vacuumVacuum
ENo vacuumVacuum
RNo vacuumNo vacuum
2. INSPECT THROTTLE POSITION SENSOR
(a) A/T:
Disconnect the throttle cable from the linkage.
(b) Disconnect the sensor connector.
(c) Insert feeler gauge between the throttle stop screw and
stop lever.
(d) Using an ohmmeter, measure the resistance between
each terminal.
Clearance between
lever and stop screwBetween
terminalsResistance
0 mm (0 in.)VTA - E20.2 - 5.7 kW
0.50 mm (0.020 in.)IDL - E22.3 kW or less
0.70 mm (0.028 in.)IDL - E2Infinity
Throttle valve
fully openedVTA - E22.0 - 10.2 kW
-VC - E22.5 - 5.9 kW
(e) Reconnect the sensor connector.
(f) A/T:
Reconnect the throttle cable.
Page 558 of 1202
SF199-02
- MFIIDLE AIR CONTROL (IAC) VALVE
MF-33
557 Author: Date:
1996 TERCEL (RM440U)
IDLE AIR CONTROL (IAC) VALVE
ON-VEHICLE INSPECTION
1. INSPECT IAC VALVE OPERATION
(a) Initial conditions:
Engine at normal operating temperature
Idle speed set correctly
Transmission in neutral position
(b) Using SST, connect terminals TE1 and E1 of the DLC1.
SST 09843-18020
(c) After engine rpm is kept at 900 - 1,300 rpm for 5 seconds,
check that it returns to idle speed.
If the rpm operation is not as specified, check the IAC valve, wir-
ing and ECM.
(d) Remove the SST from the DLC1.
SST 09843-18020
2. INSPECT IAC VALVE RESISTANCE
NOTICE:
ºColdº and ºHotº in the following sentences express the temper-
ature of the coils themselves. ºColdº is from -10°C (14°F) to 50°C
(122°F) and ºHotº is from 50°C (122°F) to 100°C (212°F).
(a) Disconnect the IAC valve connector.
(b) Using an ohmmeter, measure the resistance between ter-
minal +B and other terminals (RSC, RSO).
Resistance:
Cold17.0 - 24.5 W
Hot21.5 - 28.5 W
If resistance is not as specified, replace the IAC valve.
(c) Reconnect the IAC valve connector.