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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 35 (Engine Controls - Tests W/Codes - 3.9L) >> Self-Diagnostic Tests >> Test TC-7B - No Vehicle Speed Sensor Signal

Test TC-7B - No Vehicle Speed Sensor Signal

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, 1995 Dodge Dakota, and 1995 Dodge Cab & Chassis. 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 diagram, see WIRING DIAGRAMS  section at the end of this article.
  1. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of VSS connector, sensor ground circuit (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, go to next step.
  2. Ensure ignition is off. Disconnect Powertrain Control Module (PCM) connector. Inspect PCM connector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2. If connector is okay, go to next step.
  3. Using an external ohmmeter, check resistance of VSS signal circuit (White/Orange) wire between VSS connector and PCM connector terminal No. 47. If resistance is more than 5 ohms, repair open White/Orange wire. Perform TEST VER-2.
  4. If resistance is less than 5 ohms, check resistance of PCM connector terminal No. 47 (White/Orange wire) using scan tool in ohmmeter mode. 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 White/Orange wire. Perform TEST VER-2.
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