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Home › Saturn › 2001 › L100 Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Self-Diagnostics › Diagnostic Tests › DTC P0201: Injector No. 1 Control Circuit › Diagnostic Procedures

Diagnostic Procedures

  1. Turn ignition off for 10 seconds. Start engine and operate engine for one minute. Using scan tool, monitor status of DTC P0201. If this DTC failed this ignition cycle, go to next step. If this DTC did not fail this ignition cycle, problem is intermittent. See DIAGNOSTIC AIDS .
  2. Turn ignition off. Disconnect fuel injector No. 1 harness connector. Connect Injector Test Light (J-34730-405) to injector harness connector. Start or crank engine. If injector test light is always off, go to next step. If injector test light pulses, check for loose connection at injector connector. Repair as necessary. If connector is okay, replace fuel injector. If injector test light is always on, check for short to ground in Black wire between fuel injector and PCM. Repair as necessary. If circuit is okay, replace PCM.
  3. Turn ignition on, with engine off. Connect a test light between ground and fuel injector harness connector terminal "A" (Pink wire). If test light illuminates, go to next step. If test light does not illuminate, repair open in Pink wire. See WIRING DIAGRAMS article.
  4. Using a DVOM, check voltage on fuel injector harness connector terminal "B" (Black wire). If voltage is more than 0.2 volt, repair short to voltage in circuit. If voltage is not more than 0.2 volt, check for open in circuit or loose connection. Repair as necessary. If circuit or terminals are okay, replace PCM.
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