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Test NS-6B - Correcting No Response Condition

WARNING: This page is about a different car, the 1995 Jeep Wrangler, 1995 Jeep Grand Cherokee, and 1995 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For wiring diagrams, see WIRING DIAGRAMS  at the end of this article.
  1. If ignition was not on when NO RESPONSE message was displayed, turn ignition on to get a response. If ignition was on when NO RESPONSE message was displayed, turn ignition off.
  2. Disconnect DRB from data link connector. Disconnect Powertrain Control Module (PCM) connector. Using an external ohmmeter, check resistance between data link connector, SCI transmit circuit (Black wire) and ground.
  3. If resistance is less than 5 ohms, repair short to ground in Black wire. Perform TEST VER-1  . If resistance is greater than 5 ohms, using an external ohmmeter, check resistance between data link connector, SCI receive circuit (Black/Yellow wire), and ground.
  4. If resistance is less than 5 ohms, repair short to ground in Black/Yellow wire. Perform TEST VER-1  . If resistance is greater than 5 ohms, go to next step.
  5. Using an external ohmmeter, check resistance of SCI transmit circuit (Black wire) between data link connector and PCM connector terminal No. 25. If resistance is greater than 5 ohms, repair open in Black wire. Perform TEST VER-1  .
  6. If resistance is less than 5 ohms, using an external ohmmeter, check resistance of SCI receive circuit (Black/Yellow wire) between data link connector and PCM connector terminal No. 45. If resistance is greater than 5 ohms, repair open in Black/Yellow wire. Perform TEST VER-1  .
  7. If resistance is less than 5 ohms, connect DRB to a functional data link connector on another vehicle. Turn ignition on. Using DRB, attempt to read fault messages. If DRB does not display NO RESPONSE, replace PCM on initial vehicle. Perform TEST VER-1  .
  8. If DRB displays NO RESPONSE, substitute another DRB cartridge. Using DRB, attempt to read fault messages. If DRB does not display NO RESPONSE, replace DRB cartridge. If DRB displays NO RESPONSE, substitute another DRB adapter cable. Using DRB, attempt to read fault messages. If DRB does not display NO RESPONSE, replace DRB adapter cable. If DRB displays NO RESPONSE, replace DRB or cartridge.
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