Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Celica 1988-1989.1993-1994.2000 Approved Toyota Celica 1989 ignition system

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                                    IGNITION SYSTEM

                                      1988 Toyota Celica




         1988 DISTRIBUTORS & IGNITION SYSTEMS
         Toyota Electronic Ignition

         Celica

    DESCRIPTION
         The electronic ignition system consists of a breakerless
distributor, an ignitor, a pick-up coil, ignition coil, and related
wiring. Distributor contains a reluctor, breaker plate, and pick-up
coil assembly.
         Toyota Celica models use an Electronic Spark Advance (ESA).
The engine Electronic Control Unit (ECU) uses data supplied by various
engine sensors to provide optimum ignition timing under all
conditions.
         Some Toyota models use an Integrated Ignition Assembly (IIA)
that has the ignition coil and ignitor mounted on the distributor.

NOTE:   For more information on computer diagnosis and wiring
        diagrams, see TOYOTA COMPUTER CONTROL SYSTEM article in
        COMPUTERIZED ENGINE CONTROLS section.

    OPERATION

    ESA SYSTEMS
         The Electronic Control Unit (ECU) is pre-programmed with data
for optimum ignition timing under any engine operating condition.
Using data from engine sensors (RPM, engine temperature, etc.), the
ECU triggers ignition system to provide a spark at precisely the right
instant. The ignition system operates on the same principles as a non-
ESA system except all timing advance is controlled by the computer
rather than by vacuum and mechanical advance mechanisms.
         The ECU uses a tachometer signal from the ignition system to
detect engine speed and trigger the fuel injectors. Some ignition
system problems can be detected by the ECU and will result in a
trouble code No. 12, 13 or 14 being set in the computer memory.

    ADJUSTMENTS

    AIR GAP
         1) Using a flat, non-magnetic feeler gauge, check air gap
between pick-up coil and reluctor. See Figs. 1 and 2. Air gap should
be within .008-.016" (.20-.40 mm).
         2) If air gap is incorrect, remove ignition coil (if
equipped) and replace distributor assembly.
Fig. 1: Checking Pick-Up Coil Air Gap on Celica (3S-GE)
Courtesy of Toyota Motor Sales U.S.A., Inc.




Fig. 2: Checking Pick-Up Coil Air Gap on Celica (3S-FE)
Courtesy of Toyota Motor Sales U.S.A., Inc.

    TROUBLE SHOOTING
        ENGINE CRANKS BUT WILL NOT START
         Check for faulty spark plug(s), ignition coil, ignitor,
distributor, and ignition system wiring. Repair or replace parts as
necessary. Check ignition timing and adjust if necessary.

        HESITATION & POOR ACCELERATION
         Check for faulty spark plug(s) and ignition system wiring.
Repair or replace parts as necessary. Check ignition timing and adjust
if necessary.

        ROUGH IDLE, STALLS
         Check for faulty spark plug(s), ignition coil, ignitor,
distributor, and ignition system wiring. Repair or replace parts as
necessary. Check ignition timing and adjust if necessary.

        TESTING

        SPARK TEST
          1) Disconnect high-tension wire from distributor. On models
with integral ignition coil, disconnect a high-tension spark plug
wire. On all models, hold wire about 1/2" away from ground. If a spark
plug wire was disconnected, connect a spark plug to wire and ground
the plug.

CAUTION: On fuel injected models, crank engine for no more than 2
         seconds.

          2) Crank engine and check for sparks. If sparks occur, check
for other source of starting problem. If no sparks occur, check
connection of ignition coil, ignitor and distributor.
          3) If connections are good, check resistance of high-tension
wires. If resistance is out of specification, replace wires. See
IGNITION HIGH-TENSION WIRE RESISTANCE table. If wires are okay, go to
step 4).
          4) Check the power supply to ignition coil and ignitor. Place
ignition switch in "ON" position. Check for voltage at ignition coil
positive terminal. If voltage is present, go to step 5). If not, check
wiring between ignition switch, coil, and ignitor.
          5) Check ignition coil resistance. See
IGNITION COIL RESISTANCE TESTS in this article. If coil resistance is
correct, go to step 5). If not, replace ignition coil.
          6) Check pick-up coil resistance. See
PICK-UP COIL RESISTANCE TEST in this article. If resistance is
correct, go to step 7). If not, remove coil and replace distributor
assembly.
          7) Check air gap between reluctor and pick-up coil. If air
gap is incorrect, remove coil and replace distributor assembly.
          8) Check ignition (IGT) signal from ECU if air gap is
correct. See TOYOTA COMPUTER CONTROL SYSTEM article in COMPUTERIZED
ENGINE CONTROLS article. If ignition signal is okay, try another
ignitor.

IGNITION HIGH-TENSION WIRE RESISTANCE
 

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