Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-P033300

Condition
Engine control module (ECM) monitors combustion knock from the engine to, when needed, adjust the ignition and thus prevent continued knock. Monitoring is performed with two knock sensors located on the engine block between the cylinder rows. The control module checks the direct voltage from the sensors.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The direct voltage is higher than 4.75 V.
- Incorrect value lasts longer than 26 seconds.
- Incorrect value lasts for 2 or more subsequent driving cycles.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Ignition switch position II.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.





Substitute value
- The control module reduces the ignition angle.
- The control module blocks knock control.

Possible source
- Contact resistance and oxidation in the terminals.
- Short-circuit to supply voltage in the signal cable.
- Open-circuit in the signal cable.
- Damaged knock sensor (KS).

Fault symptom[s]
- Poor performance