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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Engine Controls - Tests W/Codes - 3.3L CNG) >> Self-Diagnostic Tests >> Test TC-2A - No Crank Reference Signal At Pcm (DTC 11)

Test TC-2A - No Crank Reference Signal At Pcm (DTC 11)

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.
  1. Using scan tool, erase DTCs. Turn ignition off then on. Attempt to start engine. If necessary, crank engine for up to 10 seconds.
  2. Using scan tool, read Distributorless Ignition System (DIS) signal status. If scan tool displays NO SIGNAL or CAM ONLY, go to step 7). If scan tool displays CRANK ONLY, go to TEST TC-3A. If scan tool does not display CRANK ONLY, condition required to set DTC is not present at this time. Go to next step.
  3. NO CRANK REFERENCE SIGNAL AT PCM DTC sets if Powertrain Control Module (PCM) does not see a Crankshaft Position (CKP) sensor signal with Camshaft Position (CMP) sensor signal present. Possible causes are: failed CKP sensor, open or shorted CKP sensor signal circuit (Gray/Violet wire), open or shorted CKP sensor 8-volt supply circuit (Orange wire), open CKP sensor ground circuit (Black/Light Blue wire), improperly adjusted CKP sensor, failed Powertrain Control Module (PCM) or failed Transmission Control Module (TCM). Go to next step.
  4. Inspect all related wiring and connectors, and repair as necessary. Perform TEST VER-2. If no problems were found with wiring and connectors, go to next step.
  5. Start engine. Wiggle wiring harness from CKP sensor to Powertrain Control Module (PCM). If engine misfired or stalled, repair wiring harness as necessary. Perform TEST VER-2. If engine did not misfire or stall, see INACTIVE DTC CONDITION  . Perform TEST VER-2.
  6. Turn ignition off. Disconnect Crankshaft Position (CKP) sensor connector. Turn ignition on. Using scan tool in voltmeter mode, check voltage on CKP sensor connector, 8-volt supply circuit (Orange wire). If voltage is less than 7 volts, go to TEST TC-2B. If voltage is more than 7 volts, turn ignition off.
  7. Connect a jumper wire between signal circuit (Gray/Violet wire) and ground circuit (Black/Light Blue wire) on CKP sensor connector harness side. Using scan tool, read DIS signal status. Make and break connection at CKP sensor connector several times while observing scan tool.
  8. If scan tool does not display CRANK ONLY, go to next step. If scan tool displays CRANK ONLY, remove CKP sensor. Inspect flywheel for damage. If flywheel is okay, replace CKP sensor. See TEST VER-2. If flywheel is damaged, repair as necessary. Perform TEST VER-2.
  9. Turn ignition off. Using scan tool in ohmmeter mode, check resistance of CKP sensor connector, ground circuit (Black/Light Blue wire). If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform TEST VER-2.
  10. If resistance is less than 5 ohms, disconnect PCM connector. Inspect PCM sensor connector for damaged or pushed-out terminals. Repair as necessary. Perform TEST VER-2. If PCM connector terminals are okay, go to next step.
  11. Using an external ohmmeter, check resistance of signal circuit (Gray/Violet wire) between CKP sensor connector harness side and PCM connector terminal No. 24. If resistance is more than 5 ohms, repair open in signal circuit Gray/Violet wire. Perform TEST VER-2.
  12. If resistance is less than 5 ohms, Using scan tool in ohmmeter mode, check resistance of CKP sensor connector, signal circuit (Gray/Violet wire). If resistance is more than 5 ohms, replace PCM. Perform TEST VER-2.
  13. If resistance is less than 5 ohms, disconnect Transmission Control Module (TCM) connector. Using scan tool, check resistance of CKP sensor connector, signal circuit (Gray/Violet wire). If resistance is more than 5 ohms, replace TCM. Perform TEST VER-2. If resistance is less than 5 ohms, repair short to ground in Gray/Violet wire. Perform TEST VER-2.
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