F300-HD_Engine-EF-EFI_System-Part1
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PART 1 - PART 2 - PART 3 - PART 4 - PART 5 - PART 6 - PART 7 - PART 8 - PART 9 - PART 10 - PART 11
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F300
EFI SYSTEM
SYSTEM CIRCUIT EF- 2 SCHEMATIC DIAGROM EF- 3 PRECAUTION EF- 4 TROUBLE SHOOTING EF- 9 DIAGNOSIS SYSTEM EF- 25 ELECTRONIC CONTROL SYSTEM EF- 47
WN88E-EFO01
EF-1
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To
starler
Ignition COM
To
tachometer
A JUN? Wm
Pressure lntake Water Oxigen
sensor sensor WSU' (As for the terminal number, refer to page EF-31)
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SCHEMATIC DIAGRAM
W
we
1 Fuel wmv
Rene
o
Water Fuel tank mggame
Starter S.W.
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PRECAUTIONS
1. The engine control system has self diagnosis function. The ECU memorizes malfunction codes for mal
functions which are occurring at present and/or occurred in the past. Memorized malfunction codes are erased when the battery is disconnected. Be sure to read the diagnosis code before starting any operations relating to the encountered malfunctions. 2. Before disconnecting the fuel line system, be sure to disconnect the cable (wire) from the negative ter
minal -I 4|..- |....u.-.. . minal of the battery. 3. The fuel line is pressurized to a pressure 2.5 atm. (2.55 kg/cm2) higher than the pressure inside the surge tank. Therefore, when disconnecting the fuel line, be sure to prevent the fuel from splashing with a cloth or the like. 4. Do not allow gasoline to get to any parts made of rubber, leather, and/or resin.
5. When cleaning the engine compartment, be very carefulto protect the electncal system from water.
WN88E-EFOO4
INSPECTION PRECAUTIONS
Maintenance Precautions 1. Ensure that the engine is correctly tuned up. 2. Precautions during gauge connection
(1) Connect the measuring terminal of the tachometer to the
negative (-) terminal of the ignition coil.
NOTE: 4 - The ignition coil has no terminal for external connection. if _ . "
Hence, insert an adequate jumper cord from the backside Q/ of the connector attached to the ignition coil. Then, con- d 4 nect the other end of the jumper cord to the measuring BE terminal of the tachometer. nect the other end of the jumper cord to the measuring // terminal of the tachometer. ~ For the purpose of connecting tachometer, the SST for
connecting to the distributor wire is available.
WNBSE-EFOOS
SST: 09991-87703-000
3. If engine misfire takes place, the following measures should V /
be taken.
,_ (1) Ensure that the battery terminals, etc. are connected
properly. (2) Handle the resistive cords carefully. ,QQ ll' (3) After completion of repairs, ensure that the ignition coil
(2) Do not submerge the oxygen sensor in water, nor out the
l I / oxygen sensor in water for the purpose of cooling it. /
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When the Vehicle is Equipped With Wireless Installation (HAM, CB, etc.): The ECU has been so designed that it is resistant to external in- fluence. However, if a vehicle is equipped with a CB wireless installation and so forth (even if its output is only 10W), it may affect the ECU adversely. Specifically, if antenna or its cord is located near the ECU, the ECU is liable to be effected adversely. Therefore, observe the following precautions. 1. Install an antenna at a place as far away as possible from
the ECU. The ECU is installed at the upperhnner section of the instru- ment panel in front of the passengers -seat. Therefore, the antenna should be installed at the rear ofthe vehicle. 2. The antenna cord should be kept at least 20 cm (7.9 inch) away from the engine wire. Never wind the antenna with the engine wire with tapes. 3. Adjust the antenna output correctly. 4. Never install a wireless installation with a high output on the
vehicle.
Air Induction System 1. Unless all of the oil level gauge, oil filler cap, ventilation hose and so forth are installed securely, engine tune-up can not be performed properly. 2. If air leakage (air admission) is present between the throttle body and the cylinder head, the engine revolution speed can not be adjusted.
Electronic Control System 1. When disconnecting the connector ofthe EFI system wiring, prior to the disconnection, be sure to turn OFF the ignition switch and pull out the back-up fuse. Or disconnect the cable (wire) from the negative battery terminal. When disconnecting the ECU connector, be sure to discon- nect the cable from the negative battery terminal.
Throttle body -Q
Air inlet panel 2
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_ When installing the battery, care must be exercised not to mistake the battery polarity. . Never apply strong impacts to the parts. Pay utmost atten
tion during the installation/removal
bee_n dropped or impaéts.
Slight contact of terminals could damage the transistorized circuits, causing serious malfunctions.
been dropped or undergone strong impacts. ~ '.". . During repairs, do not tamper those terminals other than those specified.
Slioht contact of termimlg mr rm fiamma nm +,....._=._.-.=....... /
_ Never open the cover cf the ECU. . When the system is checked on a rainy day, be very careful
not to allow water to get into connector terminals. When the engine compartment is washed, prevent water from being splashed to the EFI related parts and wiring con- nectors. . Every part should be replaced as an assembly. . Before connecting or disconnecting the wiring connector,
confirm the lock shape. ( 1) Release the lock. Disconnect the connector. (2) Insert the connector until the lock is engaged complete
. When the connector terminal is checked by means of a cir
cuit tester. Avoid applying excessive force so that the terminal may not be deformed.
10. When checking the injectcr and cold start injector, use the M
(All,-....:..,.. 00+
11. When measuring voltages for each system, use the follow
ing SST.
SST: 09842-87701-000
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EFIOYDIEWI
Fuel System
The fuel line is pressurized to a pressure of 2.55 kg/m2 (36.3 psi). Therefore, when disconnecting part of the fuel line, prevent the fuei from splashing, using a cloth or the like. Since a large amount of gasoline flows out, perform the operation, following the procedure given below. (1) Place an adequate container or a piece of cloth, etc.
under a connection. (2) Loosen the connection slowly, while preventing the fuel
from splashing, using a cloth or the like. (3) Disconnect the connection. (4) Plug the connection with a rubber plug or the like so that
no dust may enter into the fuel line. When connecting the flare nut or union bolt of the high-pres- sure pipe, observe the following instructions.
[Union bolt type] (1) Always use new gaskets. (2) First tighten the union bolt with your fingers. (3) Next, tighten the union bolt to the specified torque.
Tightening Torque: 3.5 - 4.5 kg-m (25.3 - 32.5 ft-lb)
[Flare nut type] (1) Coat the flare nut with athin film of engine oil. Tighten the
flare nut fully with your fingers. (2) Tighten the flare nut to the specified torque.
'lightening Torque: 3.5 - 4.4 kg-m (25.3 - 31.8 ft-lb)
When removing/installing the injector, observe the following instruction. (1) Do not reuse the “O” ring. (2) When installing the “O” ring tothe injector, be careful not
to damage the “O” ring. (3) Before connecting the injector with the delivery pipe,
apply silicon oil or gasoline to the “O” ring. (Never use engine oil, gear oil, brake oil and so forth.)
Install the injector to the delivery pipe and cylinder head, as shown in the figure.
5%
"O" Delivery Grommet Ring pipe
Insulator
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When part of the fuel line is disconnected, e.g. during repairs, check the fuel line for fuel leakage after the opera- tion has been completed. as follows: (1) Short the terminal F (White/Black) with the ground ter
minal (Black) of the check terminal, using following SST. SST: 09991-87702-000
NOTE: The check terminal is located at the fender RH for L.H.D vehicles and the dush board left side for R.H.D vehicles.
CAUTION: As for the terminals other than those specified, never allow them to be connected or shorted.
(2) Turn ON the ignition switch. (with the engine in a stopped t state)
At this time, a fuel pressure of 2.55 kg/cmz (36.3 psi) is
being applied to the fuel line. Under this conditions, check the fuel line system for evidence of leakage. If any leakage is present at the fuel line system, repair leaky points. Flecheck the system for leakage.
EF-8
20%
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TROUBLE SHOOTING Trouble Shooting Hints
1. in most cases, engine troubles are attributable to systems other than the EFI system.
Prior to starting the trouble shooting or the EFI system, check other systems.
(1) Power supply
Battery voltage Fuse blown 0 Fusible link blown (2) Body ground (3) Fuel supply
0 Fuel leakage v Fuel filter clogged 0 Fuel pump malfunctioning (4) Ignition system
0 Spark plugs faulty Resistive cords faulty v Distributor and igniter faulty ' 0 Ignition coil faulty (5) Air induction system
0 Admission of air (6) Others
0 Ignition timing adjusted improperly 0 Idle speed adjusted improperly 0 Idle-up VSV malfunctioning
2. Most oftroubles related tothe EFI system are merely caused
by poor wire connections. Ensure that connectors are connected securely. Check connectors, being careful as to the following points. (1) Visually inspect that terminals are not bent. (2) Ensure that connectors are securely connected and
locked.
(3) Check to see if the maifunction phenomenon takes place when applying light vibration to the connector or the wire connected to the connector.
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| Check starting system. $3?-I 1. l_gnit_ion switch
3. Check the ECU thoroughly before replacing the ECU.
The ECU is an expensive, sophisticated part. When theECU has peen replaced according to an instruction appearing in the trouble shooting, be sure to reinstall the old ECU and ensure that the malfunction takes place again. In this way, confirm that the mal- function is obviously attributable tothe old ECU.
WNBBE-EF024
4. For the trouble shooting, use a volt/ohmmeter whose inter
nal resistance is 10 or more. Use of a volt/ohmmeter whose internal resistance is less than 10 may cause an ECU malfunction or wrong diagnosis. Furthermore, be sure to employ a meter whose resolution is L 0.1V or more, 0.59 or more and whose accuracy is i-2% or more.
WNSBE-EF025
5. ln this trouble shooting, no consideration has been made to any displacement of timing belt teeth. Hence, if the trouble persists even after the trouble shooting has been carried out, check to see if the timing belt
exhibits any tooth skipping.
WN88E-EF025A
TROUBLE SHOOTING PROCEDURE
E] Symptom Engine will not start.
(Engine will not crank or cranks slowly.)
(1) Connection (2) Specific gravity of electrolyte
(Battery capacity) (3) Drive belt (4) Battery voltage 2. Charging system
(1) Alternator (2) Regulator 3. Fusible links and/or fuses
| Check electric source. 1. Batte_ry
OK
2. Starter 3. Wiring/Connection
