Signal Too High

ECM-6400 RESET VALVE, FAULTY SIGNAL
SIGNAL TOO HIGH

Reading Diagnostic trouble code (DTC) status ECM-6400:



Note! When Reading the Diagnostic trouble code (DTC) status, other stored diagnostic trouble codes (DTCs) and their status will be listed.

- Read 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 Cables"
No - Continue below.


Checking wiring and connectors



Check the signal cable between engine control module (ECM) terminal #A12 and camshaft reset valve terminal #2 for an intermittent short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Intermittent Faults

Other information:
- To connect the breakout box, Connecting the Breakout Box (ECM)
- To access/replace the camshaft reset valve, Variable Valve Timing Solenoid, Replacing
- With the ignition on and the camshaft reset valve connector disconnected, the voltage at connector terminal #1 should be approximately Ubat. There should be a pulse modulated signal with a peak voltage of approximately Ubat and with a frequency of approximately 250 Hz at connector terminal #2
- For information about signals, Pinout Values and Diagnostic Parameters


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


Checking Cables



Check the camshaft reset valve resistance between #1 and #2, resistance should be approximately 3.7 ohm

Check the signal cable between engine control module (ECM) #A12 and camshaft reset valve #2 for a short-circuit to supply voltage according to [1][2]Checking Wiring and Terminals. Permanent Fault

Remedy as necessary

Other information:
- To connect the breakout box, Connecting the Breakout Box (ECM)
- To access/replace the camshaft reset valve, Variable Valve Timing Solenoid, Replacing
- With the ignition on and the camshaft reset valve connector disconnected, the voltage at connector terminal #1 should be approximately Ubat. There should be a pulse modulated signal with a peak voltage of approximately Ubat and with a frequency of approximately 250 Hz at connector terminal #2
- For information about signals, Pinout Values and Diagnostic Parameters


Verification



Hint: After carrying out the repair, check that the fault has been remedied.
- Ignition off.
- Reinstall the connectors, components etc.
- Start the engine.
- Check that the ACTUAL and DESIRED values for the reset valve are approximately the same. Increase the engine speed slightly if required.

Is the function OK?
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.