1996 TOYOTA TERCEL fuel pressure

DI-52
- DIAGNOSTICSENGINE
1996 TERCEL (RM440U)
DTC P0300 Random/Multiple Cylinder Misfire Detected
DTC P0301 Cylinder 1 Misfire Detected
DTC P0302 Cylinder 2 Misfire Detected
DTC P0303 Cylinder 3 Misfire Detected
DTC P0304 Cylinder 4 Misfire Detected
CIRCUIT DESCRIPTION
Misfire: The ECM uses the crankshaft position sensor and camshaft position sensor to monitor changes in
the crankshaft rotation for each cylinder.
The ECM counts the number of times the engine speed change rate indicates that misfire has occurred. And
when the misfire rate equals or exceeds the count indicating that the engine condition has deteriorated, the
MIL lights up.
If the misfire rate is high enough and the driving conditions will cause catalyst overheating, the MIL blinks
when misfiring occurs.
DTC No.DTC Detection ConditionTrouble Area
P0300Misfiring of random cylinders is detected during any particular
200 or 1,000 revolutions
Ignition system


Injector
P0301
P0302
For any particular 200 revolutions of the engine, misfiring is
detected which can cause catalyst overheating
(This causes MIL to blink)

Injector

Fuel line pressure

Compression pressure

Valve clearance not to specification
P0302
P0303
P0304For any particular 1,000 revolutions of the engine, misfiring is
detected which causes a deterioration in emissions
(2 trip detection logic)
Valve clearance not to s ecification

Valve timing

Manifold absolute pressure sensor

Engine coolant temp. sensor
HINT:
When the 2 or more codes for a misfiring cylinder are recorded repeatedly but no Random Misfire code is
recorded, it indicates that the misfires were detected and recorded at different times.
DI39Y-04

A15699
- DIAGNOSTICSENGINE
DI-55
1996 TERCEL (RM440U)
2 Check voltage of ECM terminals for injector of failed cylinder.
PREPARATION:
(a) Remove the lower finish panel.
(b) Turn the ignition switch ON.
CHECK:
Measure the voltage between applicable terminals of the ECM
connector and the body ground.
OK:
Voltage: 9 - 14 V
OK Go to step 4.
NG
3 Check injector resistance of misfiring cylinder (See page MF-16).
NG Replace injector.
OK
Check for open and short in harness and con-
nector between injector and ECM (See page
IN-26).
4 Check fuel pressure (See page MF-1).
NG Check and repair fuel pump, pressure regulator,
fuel pipe line and filter (See page MF-5).
OK
5 Check injector injection (See page MF-16).
NG Replace injector.

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.

EM0KB-06
- ENGINE MECHANICALCOMPRESSION
EM-3
424 Author
: Date
:
1996 TERCEL (RM440U)
COMPRESSION
INSPECTION
HINT:
If there is lack of power, excessive oil consumption or poor fuel
economy, measure the compression pressure.
1. WARM UP AND STOP ENGINE
Allow the engine to warm up to normal operating temperature.
2. REMOVE SPARK PLUGS (See page IG-1)
3. CHECK CYLINDER COMPRESSION PRESSURE
(a) Insert a compression gauge into the spark plug hole.
(b) Fully open the throttle.
(c) While cranking the engine, measure the compression
pressure.
HINT:
Always use a fully charged battery to obtain engine revolutions
of 250 rpm or more.
(d) Repeat steps (a) through (c) for each cylinder.
NOTICE:
This measurement must be done in as short a time as pos-
sible.
Compression pressure:
1,275 kPa (13.0 kgf/cm
2, 185 psi) or more
Minimum pressure:
980 kPa (10.0 kgf/cm
2, 142 psi)
Difference between each cylinder:
100 kPa (1.0 kgf/cm
2, 14 psi) or less
(e) If the cylinder compression in one or more cylinders is low,
pour a small amount of engine oil into the cylinder through
the spark plug hole and repeat steps (a) through (c) for
cylinders with low compression.

If adding oil helps the compression, chances are
that the piston rings and/or cylinder bore are worn
or damage.

If pressure stays low, a valve may be sticking or
seating is improper, or there may be leakage past
the gasket.
4. REINSTALL SPARK PLUGS

EM1OH-01
- ENGINE MECHANICALENGINE UNIT
EM-57
1996 TERCEL (RM440U)
REMOVAL
1. REMOVE BATTERY
2. REMOVE HOOD
3. REMOVE ENGINE UNDER COVERS
4. DRAIN ENGINE COOLANT
5. DRAIN TRANSAXLE OIL (FLUID)
6. REMOVE AIR CLEANER ASSEMBLY WITH AIR IN-
TAKE CONNECTOR
7. REMOVE RADIATOR (See page CO-16)
8. DISCONNECT ACCELERATOR CABLE
9. DISCONNECT FUEL HOSE
Remove the union bolt and gaskets, and disconnect the fuel in-
let hose.
NOTICE:
Catch leaking fuel in a container.
10. REMOVE CHARCOAL CANISTER
(a) Disconnect the canister hoses.
(b) Remove the charcoal canister.
11. DISCONNECT HOSES
(a) Disconnect the brake booster vacuum hose.
(b) Disconnect the MAP sensor hose.
(c) Disconnect the heater hoses.
12. DISCONNECT SPEEDOMETER CABLE FROM
TRANSAXLE
13. w/ PS:
DISCONNECT IDLE-UP AIR HOSES FROM AIR CON-
TROL VALVE
14. DISCONNECT ENGINE WIRE HARNESS
Disconnect these connectors and wires:

Main heated oxygen sensor connector

Oil pressure switch connector

EC0JN-01
EC3070
Gasket
Check Valve
(Vacuum Valve)
- EMISSION CONTROLEVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM
EC-5
518 Author
: Date
:
1996 TERCEL (RM440U)
EVAPORATIVE EMISSION (EVAP)
CONTROL SYSTEM
INSPECTION
1. VISUALLY INSPECT LINES AND CONNECTIONS
Look for loosen connections, sharp bends or damage.
2. VISUALLY INSPECT FUEL TANK
Look for deformation, cracks or fuel leakage.
3. VISUALLY INSPECT FUEL TANK CAP
Check if the cap and or gasket are deformed or damaged.
If necessary, repair or replace the cap.
4. REMOVE CHARCOAL CANISTER
5. REMOVE CAP FROM CHARCOAL CANISTER
6. VISUALLY INSPECT CHARCOAL CANISTER
Look for cracks or damage.
7. INSPECT FOR CLOGGED FILTER AND STUCK
CHECK VALVE
(a) Using low pressure compressed air4.71 kPa (48 gf/cm
2,
0.68 psi), blow into port A and check that air flows from the
other ports.
If operation is not as specified, replace the charcoal canister.
(b) Blow air 4.71 kPa (48 gf/cm
2, 0.68 psi) into port B and
check that air does not flow from the other ports.

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.

P20175
New
Gasket
FI1654
Fulcrum Length
SST
30 cm
FI4295
CORRECT
WRONG
WRONG Delivery Pipe O-Ring
Grommet
Injector
FI4296
Delivery
Pipe
O-Ring
Grommet
InjectorCylinder Head
- MFIMFI SYSTEM
MF-3
527 Author
: Date
:
1996 TERCEL (RM440U)
(b) When connecting the union bolt on the high pressure pipe
union, observe these procedures:
(1) Always use 2 new gaskets.
(2) Tighten the union bolt by hand.
(3) Tighten the union bolt to the specified torque.
Torque: 29.0 N´m (290 kgf´cm, 22 ft´lbf)
(c) When connecting the flare nut on the high pressure pipe
union, observe these procedures:
(1) Apply a light coat of engine oil to the flare nut, and
tighten the flare nut by hand.
(2) Using SST, tighten the flare nut to specified torque.
SST 09631-22020
NOTICE:
Do not rotate the fuel pipe, when tightening the flare nut.
Torque: 30 N´m (300 kgf´cm, 23 ft´lbf)
HINT:
Use a torque wrench with a fulcrum length of 30 cm (11.81 in.).
(d) Observe these precautions when removing and installing
the injectors.
(1) Never reuse the O-ring.
(2) When placing a new O-ring on the injector, take
care not to damage it in any way.
(3) Coat a new O-ring with spindle oil or gasoline be-
fore installing-never use engine, gear or brake oil.
(e) Install the injector in the delivery pipe and cylinder head
as shown in the illustration.