Signal Too Low

ECM-3400 KNOCK SENSOR (KS)
SIGNAL TOO LOW

Reading off the status of the diagnostic trouble code (DTC):




Note! When Reading the Diagnostic Trouble Code (DTC) status, other stored Diagnostic Trouble Codes (DTCs) and their status will be listed.

Start the engine. Let it idle for at least 15 seconds.
Read the Diagnostic Trouble Code (DTC) status. Check the status of the relevant Diagnostic Trouble Code (DTC).

Was the status of the relevant Diagnostic Trouble Code (DTC) displayed as permanent?
Yes - Skip to "Checking Wiring and Components"
No - Continue below.


Intermittent fault
Control module previously registered a fault. The fault is now no longer present.


Fault-tracing information
If the fault is intermittent, do not verify fault-tracing if the fault does not recur.
--Testing Complete--


Checking wiring and components



Check cable between control module # A46 and Knock Sensor (KS) terminal 1 for a short-circuit to ground according to [1][2]Checking Wiring and Terminals. Permanent Fault

Check cable between control module # A64 and Knock Sensor (KS) terminal 2 for a short-circuit to ground according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary.

Other information
- To localize the knock sensor (KS), Locations
- To connect the breakout box, Connecting the Breakout Box (ECM)
- For information about signals, Pinout Values and Diagnostic Parameters

Was a fault found in the wiring or connector?
Yes - Skip to "Verification"
No - Continue below.


Replacing the component
Try a new knock sensor (KS) according to Knock Sensor, Replacing


Verification



Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off;
- Reconnect connectors, reinstall components
- Start the engine and rev it once (above 1000 rpm).
- Read the Diagnostic Trouble Code (DTC) status. Check the status of the relevant Diagnostic Trouble Code (DTC).

Was the status of the relevant Diagnostic Trouble Code (DTC) displayed as intermittent?
Yes - Testing Complete.
No - Continue below.


Fault-tracing information
The fault should have been detected and remedied. As this is not the case fault-tracing has failed.
Exit fault-tracing for this diagnostic trouble code (DTC) or make another attempt.