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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Controls - Tests W/Codes - 2.2L) >> Self-Diagnostic Tests >> Test TC-2C - No Crank Reference Signal At Pcm

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

WARNING: This page is about a different car, the 1994 Plymouth Sundance and 1994 Dodge Shadow. 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 TABLE. For wiring diagrams, see WIRING DIAGRAMS  .
  1. If NO CAM SYNC SIGNAL AT PCM trouble code message is also set, go to TEST TC-3A. If NO CAM SYNC SIGNAL AT PCM trouble code message is not set, using DRB erase trouble codes. Attempt to start engine. If engine will not start, crank engine for at least 10 seconds. Using DRB, read trouble codes. If DRB displays NO CRANK REFERENCE SIGNAL AT PCM, go to step 5). If DRB does not display NO CRANK REFERENCE SIGNAL AT PCM, condition required to set trouble code message is not present at this time. Go to next step.
  2. The NO CRANK REFERENCE SIGNAL AT PCM trouble code message sets if Powertrain Control Module (PCM) does not see a Crankshaft Position (CKP) sensor signal with cam signal present. Possible causes are: open or shorted CKP sensor Orange wire, open or shorted CKP sensor Gray/Black wire, open CKP sensor Black/Light Blue wire, improperly adjusted CKP sensor, failed CKP sensor, failed distributor drive system 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 were found with wiring and connectors, go to next step.
  4. Start engine. Wiggle wiring harness from CKP sensor to PCM. If engine misfired or stalled, repair wiring harness as necessary. Perform TEST VER-2. If engine did not misfire or stall, see INACTIVE TROUBLE CODE CONDITION  . Perform TEST VER-2.
  5. Turn ignition off. Disconnect Crankshaft Position (CKP) sensor connector. Inspect CKP sensor connector for damaged or pushed out terminals. Repair as necessary. Perform TEST VER-2. If sensor connector terminals are okay, go to next step.
  6. Turn ignition on. Put DRB in voltmeter mode. Using DRB, check voltage on CKP sensor connector Orange wire. If voltage is less than 7 volts, go to TEST TC-2D.
  7. If voltage is more than 7 volts, using DRB, check voltage on CKP sensor Gray/Black wire. If voltage is less than 4 volts, go to TEST TC-2D.
  8. If voltage is more than 4 volts, turn ignition off. Put DRB in ohmmeter mode. Using DRB, check resistance on CKP sensor Black/Light Blue wire. If resistance is more than 5 ohms, repair open in Black/Light Blue wire. Perform TEST VER-2.
  9. If resistance is less than 5 ohms, disconnect coil wire from distributor cap. Place end of coil wire 1/4" from ground. Disconnect Camshaft Position (CMP) sensor connector. Connect a jumper wire between Gray/Black wire on CKP sensor connector harness side and Tan/Yellow wire on CMP sensor connector harness side. Connect another jumper wire between Tan/Yellow wire on CMP sensor connector harness side and ground.
  10. Make and break connection between CMP sensor connector Tan/Yellow wire and ground several times while watching coil wire for spark. If coil wire sparked, go to next step. If coil wire did not spark, replace PCM. Perform TEST VER-2.
  11. Remove distributor cap. Crank engine while watching rotor. If rotor turned, replace CKP sensor. Perform TEST VER-2  . If rotor did not turn, repair distributor drive system as necessary. Perform TEST VER-2.
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