Justin's Toyota Service

E11 Camshaft Position Sensor

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Torque wrench settings Nm lbf

Ignition coil to cylinder head:

4E-FE engine........................................................................................................................................20

4ZZ-FE and 3ZZ-FE engines..................................................................................................7

Knock sensor:

4E-FE engine........................................................................................................................................45

4ZZ-FE engine:

Stud........................................................................................................................................................10

Nut..........................................................................................................................................................20

3ZZ-FE engine....................................................................................................................................39

2.3 Carefully prise the plastic shield at the locking tab to release it from the ignition coil

1 General information

There are three types of ignition system fitted to models covered by this manual.

The first type, fitted to the 1.6 litre 4A-FE engine, has a distributor fitted to the left-hand end of the cylinder head, which incorporates the ignition pick-up sensors to monitor the position and speed of the camshaft, and therefore the firing cycle. The engine management ECM uses the information from the sensors to calculate the precise moment to interrupt the current to the primary ignition coil, which causes the secondary ignition coil to generate high voltage which passes down the HT lead to the distributor cap. This is then passed to the correct HT lead by the spinning rotor, and then jumps across the spark plug electrodes, causing a spark which ignites the air/fuel mixture. This type of system, where the ignition coil and igniter is integrated into the distributor, Toyota call their Integrated Ignition Assembly (II A).

The second type, fitted to the 1.3 litre 4E-FE engines, is a distributorless ignition system. Here the crankshaft speed and position is monitored by a sensor fitted adjacent to the crankshaft pulley at the right-hand end of the engine. The engine management ECM calculates the optimum moment to trigger the spark, then interrupts the primary signal to one of the two ignition coils bolted to the left-hand end of the cylinder head. The positive and negative ends of secondary coils are connected to the spark plugs on cylinders 1 and 4, and 2 and 3. When the primary current is interrupted, the secondary coil generates a spark at the two cylinders it's connected to. However, only one of these sparks occurs at the correct combustion phase and causes ignition, the other spark occurs harmlessly during the exhaust stroke, and is known as a 'wasted' spark. A knock sensor is also fitted, to monitor for any signs of pre-ignition. Should any be detected, the ECM will gradually retard the ignition timing until the symptoms disappear.

The third type, fitted to the 1.4 litre 4ZZ-FE and 1.6 litre 3ZZ-FE engines, has one ignition coil per cylinder, fitted directly above each spark plug. The engine management ECM information from the crankshaft and camshaft position sensors to calculate the optimum to generate a spark at each cylinder sequentially. A knock sensor is also fitted, to monitor for any signs of pre-ignition. Should any be detected, the ECM will gradually retard the ignition timing until the symptoms disappear.

Precautions

When working on the ignition system, take the following precautions:

a) Do not keep the ignition switch on for more than 10 seconds if the engine will not start.

b) Always connect a tachometer in accordance with the manufacturer's instructions. Some tachometers may be incompatible with this ignition system. Consult a dealer service department before buying a tachometer for use with this vehicle.

c) Never allow the ignition coil terminals to touch earth. Earthing the coil could result in damage to the igniter and/or the ignition coil.

d) Do not disconnect the battery when the engine is running.

2 Ignition coil -

testing and renewal

Testing

1 Ensure the ignition is turned off.

4A-FE engine

2 Undo the screws, and remove the distributor cap (see illustration 3.4).

3 Remove the plastic shield from the coil (see illustration).

4 Remove the mounting bolts from the coil electrical connectors, and connect the ohmmeter leads.

5 Using an ohmmeter:

a) Measure the resistance between the positive and negative terminals of the coil (see illustration). Compare your reading with the specified coil primary resistance listed in this Chapter's Specifications.

b) Measure the resistance between the positive terminal and the high tension terminal (see illustration). Compare your reading with the specified coil secondary resistance listed in this Chapter's Specifications.

6 If either of the above tests yield resistance values outside the specified amount, the coil may be defective.

4E-FE engine

7 Note their fitted positions, then disconnect the HT leads from the ignition coils (see illustration).

8 Using an ohmmeter, measure the resistance between the positive and negative HT terminals of each coil (see illustration).

2.5a Measure between the positive and negative terminals of the 2.5b Measure between the positive terminal and the high tension coil to the check the primary resistance terminal to check the coil secondary resistance

2.7 Lift the clip the pull the HT caps from the ignition coils

2.8 Measure the resistance between the positive and negative HT terminals of each coil

2.14 Remove the retaining screws (arrowed) and lift the coil from the distributor housing

2.7 Lift the clip the pull the HT caps from the ignition coils

2.8 Measure the resistance between the positive and negative HT terminals of each coil

2.14 Remove the retaining screws (arrowed) and lift the coil from the distributor housing

2.16 Press the clips and disconnect the ignition coil wiring plugs (arrowed)

2.17 Undo the two bolts (arrowed) and detach the ignition coil from the bracket

2.21 Depress the clip (arrowed) and disconnect the ignition coil's wiring plugs

2.16 Press the clips and disconnect the ignition coil wiring plugs (arrowed)

9 If the resistances measured for either coil is outside those given in the Specifications, the coil(s) may be defective.

4ZZ-FE and 3ZZ-FE engines

10 At the time of writing, no testing specifications were available for these engines.

Renewal

11 Ensure the ignition is turned off.

4A-FE engine

12 Remove the distributor cap, then remove the heat shield from the coil (see illustration 2.3)

13 Label and disconnect the wires from the coil terminals.

14 Undo the coil mounting screws (see illustration).

15 Refitting is a reversal of removal. 4E-FE engine

16 Note their fitted positions, then disconnect the HT leads (see illustration 2.7) and wiring plugs (see illustration) from the ignition coils.

17 Undo the bolts and separate the coil(s) from the mounting bracket (see illustration).

18 If required, undo the two bolts and one nut securing the coil mounting bracket to the cylinder head.

19 Refitting is the reverse of removal.

4ZZ-FE and 3ZZ-FE engines

20 Undo the two nuts, prise out the plastic fasteners at the rear, and remove the plastic cover from the top of the engine.

2.17 Undo the two bolts (arrowed) and detach the ignition coil from the bracket

21 Disconnect the wiring plugs from the ignition coils (see illustration).

22 Undo the bolts and pull the ignition coils from the top of the spark plugs (see illustration). Recover the dust seal (where fitted).

23 Refitting is a reversal of removal.

3 Distributor -

removal and refitting

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