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Check and replace the knock sensor
Knock sensors react to increase the intensity of vibration of the engine, usually caused by the detonation of an air-fuel mixture. On the basis of information received from the sensor PCM adjusts ignition timing point, trying to maintain it at the highest possible level guaranteeing a sufficient return of the engine efficiency. The sensor generates an AC signal whose amplitude is proportional to the level of vibration rises. To compensate, if necessary detonations PCM instructs for shifting of the ignition point in the direction of deceleration. On models 1993 and 1994 Vol. a sensor mounted on the right side of the engine, directly below the exhaust manifold. On models since 1995 Vol. the sensor is placed under the inlet pipeline. CHECK |  | Disconnect the sensor wiring. Measure the resistance between the two terminals of the sensor connector, - meter should register conductivity presence, otherwise replace the gauge.  | The electrical resistance of the knock sensor is very high, use an ohmmeter, the connecting wiring which is designed at least 10 milliohms. |
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REPLACEMENT Models 1993 and 1994 Vol.
|  | Before proceeding with the procedure, wait for the complete cooling of the engine. |
1. Drain the cooling system (see chap. Adjustment and routine maintenance).
2. Poddomkratte car and establish it on props
3. Disconnect the wiring from the knock sensor and release harness from intermediate clamps.
4. Remove the sensor from the engine block.
5. Install in the reverse order.
6. Do not forget to refill the cooling system (see chap. Adjustment and routine maintenance). |
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Models from 1995 MY. | 1. Remove the two (upper and lower) section of the intake pipe (see. Part Engines SOHC of the Head of Engine).
2. Disconnect the sensor wiring.  | 3. Remove the retaining screw and remove the sensor from the engine block. |
4. Install in the reverse order.
5. Replace the inlet pipeline (see. Part Engines SOHC of the Head of Engine). |
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