Info

removal, testing and refitting

Removal

4ZZ-FE and 3ZZ-FE engines

1 Remove the intake manifold as described in Chapter 4A.

2 Disconnect the sensor wiring plug, then unscrew the sensor (3ZZ-FE engine) or undo

7.2 Undo the nut and remove the knock sensor from the cylinder block (4ZZ-FE engine shown)

the nut and pull the sensor (4ZZ-FE engine) from the engine block (see illustration).

4E-FE engine

3 Reach underneath the intake manifold and disconnect the sensor wiring plug.

4 Unscrew the sensor from the engine block.

Testing

5 On 3ZZ-FE and 4E-FE engines, connect the

7.6 On 4ZZ-FE engines, connect the ohmmeter to terminals E2 and KNK1 of the knock sensor connector leads of an ohmmeter to the sensor terminal and the metal body of the sensor. There should be no continuity. If there is, the sensor may be defective.

6 On 4ZZ-FE engines, connect the leads of an ohmmeter between terminals E2 and KNK1 of the sensor connector. The resistance should be less than 1 MOhms. (see illustration). If the resistance is not as specified, the sensor may be defective.

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