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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (Engine Controls - Tests W/Codes - 3.3L Gasoline) >> 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 at the end of this article.
  1. Turn ignition off. Disconnect Camshaft Position (CMP) sensor connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on Camshaft Position (CMP) sensor connector 8-volt supply circuit (Orange wire). If voltage is less than 7 volts, repair open Orange wire. Perform TEST VER-2.
  2. If voltage is more than 7 volts, turn ignition off. Connect a jumper wire between signal circuit (Tan/Yellow wire) and ground circuit (Black/Light Blue wire) on CMP sensor connector harness side. Using scan tool, read Distributorless Ignition System (DIS) signal status. Make and break connection at CMP sensor connector several times while observing scan tool.
  3. If scan tool does not display CAM ONLY, go to next step. If scan tool displays CAM ONLY, turn ignition off. Remove CMP sensor. Inspect cam sprocket. If cam sprocket is okay, replace CMP sensor. Perform TEST VER-2. If cam sprocket is damaged, repair as necessary. Perform TEST VER-2.
  4. Turn ignition off. Put scan tool in ohmmeter mode. Check resistance of CMP sensor connector ground circuit (Black/Light Blue wire). If resistance is more than 5 ohms, repair open Black/Light Blue wire. Perform TEST VER-2.
  5. If resistance is less than 5 ohms, 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.
  6. Using an external ohmmeter, check resistance of signal circuit (Tan/Yellow wire) between CMP sensor connector harness side and PCM connector terminal No. 44. If resistance is more than 5 ohms, repair open Tan/Yellow wire. Perform TEST VER-2.
  7. If resistance is less than 5 ohms, put scan tool in ohmmeter mode. Using scan tool, check resistance of CMP sensor connector signal circuit (Tan/Yellow wire). If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2. If resistance is less than 5 ohms, repair short to ground in Tan/Yellow wire. Perform TEST VER-2.
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