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Error codes

  #1  
Old 01-12-2019, 06:06 AM
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Location: Sussex
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Default Error codes

My mazda 2 had engine light on. Diagnostic showed these 2 codes. Any ideas? Thanks

 
  #2  
Old 01-13-2019, 05:06 AM
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P0328 is a Knock Sensor fault code..

U0401 is a communication fault, & usually aren't anything to worry about.



DTC P0328:00
KS circuit high input

DETECTION CONDITION
• If the input voltage is more than 3.75 V, the PCM determines that the KS circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE
•KS connector or terminals malfunction
• KS malfunction
• PCM connector or terminals malfunction
• Short to power supply in wiring harness between KS terminal A and PCM terminal 2AN
• Open circuit in wiring harness between KS terminal A and PCM terminal 2AN
• PCM malfunction
 
  #3  
Old 01-16-2019, 02:21 AM
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Originally Posted by grim_reaper View Post
P0328 is a Knock Sensor fault code..

U0401 is a communication fault, & usually aren't anything to worry about.



DTC P0328:00
KS circuit high input

DETECTION CONDITION
• If the input voltage is more than 3.75 V, the PCM determines that the KS circuit has a malfunction.
Diagnostic support note
• This is a continuous monitor (CCM).
• The MIL illuminates if the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA (Mode 2)/Snapshot data is available.
• The DTC is stored in the PCM memory.

POSSIBLE CAUSE
•KS connector or terminals malfunction
• KS malfunction
• PCM connector or terminals malfunction
• Short to power supply in wiring harness between KS terminal A and PCM terminal 2AN
• Open circuit in wiring harness between KS terminal A and PCM terminal 2AN
• PCM malfunction



Thank you for that info, she's that mean I just need to replace the knock sensor?

Thanks
 
  #4  
Old 01-16-2019, 02:44 AM
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Location: Queensland Australia
Posts: 3,626
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No, not necessarily, it could be a faulty sensor, or faulty wiring or even a faulty ECU/PCM.

It will require complete diagnostics to find the actual fault.

You can fit a new knock sensor & hope that's the fix, you might be lucky, you might not.
 
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