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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Engine Controls - Tests W/Codes - 5.2L Gasoline) >> Self-Diagnostic Tests >> Test TC-2B - No Crank Reference Signal At Pcm

Test TC-2B - No Crank Reference Signal At Pcm

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon, 1995 Dodge Ram Van, 1995 Dodge Pickup, and 1995 Dodge Dakota. 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. Disconnect Camshaft Position (CMP) sensor connector. Inspect CMP sensor connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If CMP sensor connector terminals are okay, go to next step.
  2. Turn ignition on. Using scan tool in voltmeter mode, check voltage on CMP sensor connector 8-volt supply circuit (Orange wire). If voltage is more than 7 volts, replace CMP sensor. Perform TEST VER-2.
  3. If voltage is less than 7 volts, turn ignition off. Disconnect Powertrain Control Module (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.
  4. Using scan tool in ohmmeter mode, check resistance of Crankshaft Position Sensor (CKP) connector, 8-volt supply circuit (Orange wire). If resistance is less than 5 ohms, repair short to ground in Orange or White/Black wire. Perform TEST VER-2.
  5. If resistance is more than 5 ohms, check resistance of 8-volt supply circuit (Orange wire) between CKP sensor harness side connector and PCM connector terminal No. 7 using an external ohmmeter. If resistance is more than 5 ohms, repair open Orange or White/Black wire. Perform TEST VER-2. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-2.
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