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Home › Saturn › 1998 › SW2 Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes › Diagnostic Trouble Codes › DTC P0340 - Cylinder Detect Signal Missing › Diagnostic Procedures

Diagnostic Procedures

  1. Connect scan tool. Start and operate engine for one minute. Using scan tool, check if DTC is active. If DTC is active, go to next step. If DTC is not active, problem is intermittent. See DIAGNOSTIC AIDS.
  2. If engine misfire is present, check for a fault condition on cylinder No. 1 or No. 4. Check wires, plugs and cylinder compression. If engine misfire is not present, go to next step.
  3. Install a jumper wire between IC module terminal "D" and harness connector. With engine running, observe 7X counter by using a test light. Connect test light to ground and momentarily touch jumper wire. Observe 7X counter on scan tool. If 7X counter resets to zero when touched by test light, check tightness of harness connector terminal to EI module or faulty EI module. If 7X counter does not reset to zero, go to next step.
  4. Check cylinder No. 4 signal circuit between PCM and IC module terminal "D" for open, short to ground or short to voltage. Repair as necessary. If circuit is okay, check tightness of harness connector terminals to PCM.
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