My car keeps giving me the 340, 1377,1375, 371.

Tiny
JIMMIEHOLMES
  • MEMBER
  • 1999 CADILLAC STS
  • 223,000 MILES
My car keeps giving me the 340, 1377,1375, 371 codes, I have already changed the cam sensor, tps sensor what could this be
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Monday, October 22nd, 2012 AT 12:12 AM

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Tiny
ASEMASTER6371
  • EXPERT
Circuit Description
This diagnostic test checks to see if there are eight 4X reference pulses between CAM signals. Do not attempt diagnosis or repair unless the customer is experiencing driveability problems associated with this DTC.

Conditions for Running the DTC

DTC P1376 not set.
Engine speed greater than 496 RPM.
Number of CAM pulses received since key ON is 7 or greater.

Conditions for Setting the DTC

The number of 4X reference pulses during two CAM pulses periods is not 16 at least 2 time in a row.

Action Taken When the DTC Sets

The PCM will illuminate the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records.

Conditions for Clearing the MIL/DTC

The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.
A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.
A History DTC will clear after forty consecutive warm-up cycles with no failures of any emission related diagnostic test.
Use a scan tool to clear DTCs.
Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes. See: Powertrain Management Computers and Control Systems Testing and Inspection Reading and Clearing Diagnostic Trouble Codes

Diagnostic Aids

Since this DTC can set under normal conditions no diagnosis should be performed unless a driveability complaint is present.

This DTC may also set if all four camshafts are off by one tooth, 10 degrees before top dead center, this will be accompanied by severe driveability complaints.

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

Other conditions may cause this DTC to set. Diagnose them first.

You may need to replace the chains.

Roy
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Monday, October 22nd, 2012 AT 12:27 AM
Tiny
JIMMIEHOLMES
  • MEMBER
Thank you for the information, but how would I know if the ignitionsystem is in the module mode or the ignition control mode.
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Tuesday, October 23rd, 2012 AT 3:01 AM

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