P1374 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

 
 
 
 
Thread Tools Search this Thread
Old 09-27-2009, 12:04 PM   #1
Retired Senior Admin

Expert Gearhead
Thread Starter
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default P1374

P1374

Description
3X REFERENCE CIRCUIT

3X reference circuit is produced by Ignition Control Module
(ICM). PCM uses 3X reference signal pulses to calculate engine speed
(RPM) and crankshaft position at engine speed more than 1200 RPM. PCM
uses pulses on this circuit to initiate injector pulses. If PCM
receives incorrect number of pulses on 3X reference circuit, DTC P1374
will set.

Symptoms
You likely won't notice any drivability problems.

Causes

  • Engine running and PCM is receiving 18X reference signal
    pulses.
  • Ratio of 18X reference signal pulses to 3X reference signal
    pulses received by PCM do not equal 6.
  • Ratio of 18X reference signal pulses to camshaft reference
    signal pulses received by PCM equals 36.
Solutions
  • Check for faulty 3X reference signal circuit connection at
    PCM. Repair as necessary.
  • Check for incorrect harness routing near secondary
    ignition components, ignition coil arcing to wiring harness or ICM.
  • Check ignition coils for cracks, carbon tracking or other signs of
    damage.
  • Check for faulty connections at ICM.
  • Replace ICM.
Danthurs is offline  
 
 
 


Tags
obd2, obdii, p1374

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:46 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.