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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 25 (Engine Controls - Tests W/Codes - 2.5L) >> Self-Diagnostic Tests >> Test TC-3A - No Cam Sync Signal At Pcm (DTC 54)

Test TC-3A - No Cam Sync Signal At Pcm (DTC 54)

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS  section.
  1. Using scan tool, erase DTCs. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds. Using scan tool, read DTCs. If scan tool displays NO CAM SYNC SIGNAL AT PCM, go to step 5). If scan tool does not display NO CAM SYNC SIGNAL AT PCM, condition required to set DTC message is not present at this time. Go to next step.
  2. NO CAM SYNC SIGNAL AT PCM DTC message sets if Powertrain Control Module (PCM) does not see a Camshaft Position (CMP) sensor signal with crankshaft position sensor signal present. Possible causes are: open CMP sensor Orange wire, open or shorted CMP sensor Tan/Yellow wire, open CMP sensor Black/Light Blue wire, failed CMP sensor, improperly adjusted CMP sensor, or failed PCM. Go to next step.
  3. Inspect all related wiring and connectors and repair as necessary. Perform TEST VER-2. If no problems are found with wiring and connectors, go to next step.
  4. Start engine. Wiggle wiring harness from CMP sensor to PCM. If engine misfires or stalls, repair wiring harness as necessary. Perform TEST VER-2. If engine does not misfire or stall, see INACTIVE DTC CONDITION  .
  5. Perform TEST VER-2.
    NOTE: For circuit and connector terminal identification, see CONNECTOR IDENTIFICATION  . For wiring diagrams, see WIRING DIAGRAMS section.
  6. Turn ignition off. Disconnect Camshaft Position (CMP) sensor connector. Turn ignition on. Put scan tool in voltmeter mode. Using scan tool, check voltage on CMP sensor connector Orange wire. If voltage is less than 7 volts, repair open Orange wire. Perform TEST VER-2.
  7. If voltage is more than 7 volts, using scan tool, check voltage on CMP sensor connector Tan/Yellow wire. If voltage is more than 4 volts, go to step 10).
  8. If voltage is less than 4 volts, turn ignition off. Disconnect PCM connector. Inspect PCM connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If PCM connector terminals are okay, go to next step.
  9. Using scan tool, check resistance of PCM connector terminal No. 44 (Tan/Yellow wire). If resistance is less than 5 ohms, repair short to ground in Tan/Yellow wire. Perform TEST VER-2.
  10. If resistance is more than 5 ohms, using an external ohmmeter, check resistance of Tan/Yellow wire between CMP sensor connector and PCM connector terminal No. 44. If resistance is more than 5 ohms, repair open Tan/Yellow wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
  11. Turn ignition off. Put scan tool in ohmmeter mode. Using scan tool, check resistance of CMP sensor connector Black/Light Blue wire. If resistance is more than 5 ohms, repair open Black/Light Blue wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace CMP sensor. Perform TEST VER-2.
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