Ignition

FB. DIAGNOSTIC TROUBLE CODE (DTC) 1-4-3 DL EZ 116 K

* 1-4-3 Knock sensor (KS) signal absent or faulty.

DTC Conditions

The KS signal is tested when the engine is warm and the engine speed is over 2000 rpm. If the signal is below a certain level the ignition will be retarded and the DTC 1-4-3 logged.

Because it is not possible to measure the KS signal without special equipment only the wiring is tested.

Causes Of Fault:




Break or grounding in the wiring or the KS. Contact resistance in the connections.

Fault symptoms:

Poor acceleration, lack of power, high fuel consumption.

FB1

Connecting The Test Box




Connect the test box to DI and check the GND point in accordance with P3-P4.

-Continue checking the wiring to the KS FB2.

FB2

Checking The Wiring To The Knock Sensor (KS)

-Ignition off.




-Disconnect the KS connector and bridge the connections in the connector with jumpers.




Connect an ohmmeter between #12 and #13.

The ohmmeter should read approx. 0 OHMS.

If the reading Is Incorrect:

-Check the wiring between the control module and the sensor for breaks and contact resistance and clean the KS connector and treat it for corrosion.

-Remove the jumper.




Connect an ohmmeter between #13 and #20 (GND).

The ohmmeter should read infinite resistance.

If this value Is OK:

Intermittent fault.

-Check the connections for loose contacts, clean the KS connector and treat it for corrosion.

If the reading Is Incorrect:

-Check the wiring between the control module and the sensor for grounding, clean the KS connector and treat it for corrosion.