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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Engine Controls - Tests W/Codes - 1.8L) >> Diagnostic Charts >> Test NS-6A - Checking DRB Communication

Test NS-6A - Checking DRB Communication

WARNING: This page is about a different car, the 1994 Plymouth Laser and 1994 Eagle Talon. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS .
  1. If DRB display is not blank, go to step 5). If DRB display is blank, disconnect DRB adapter from diagnostic connector. Turn ignition switch to OFF position. Using an ohmmeter, check resistance between diagnostic connector terminal No. 12 (Black wire) and ground. See Figure.
  2. If resistance is more than 10 ohms, repair Black wire for an open to ground. Perform TEST VER-1 . If resistance is less than 10 ohms, inspect DRB adapter Red battery lead for a good connection. Repair as required. Perform TEST VER-1.
  3. If battery connection is okay, connect a known good DRB adapter to diagnostic connector and reconnect DRB. If DRB display is not blank, go to TEST NS-1A . If DRB display is blank, connect a known good DRB to adapter.
  4. If DRB display is not blank, go to TEST NS-1A. If DRB is blank, insert a known good program cartridge into DRB. DRB display should be operational. Perform TEST NS-1A.
  5. Turn ignition switch to OFF position. Disconnect DRB adapter from diagnostic connector. Disconnect ECU 24-pin connector. Using an ohmmeter, measure resistance of Yellow wire between ECU 24-pin connector terminal No. 1 and diagnostic connector terminal No. 1.
  6. If resistance is more than 10 ohms, repair open Yellow wire. Perform TEST VER-1. If resistance is less than 10 ohms, measure resistance between ECU 24-pin connector terminal No. 1 (Yellow wire) and ground. If resistance is less than 10 ohms, repair Yellow wire for a short to ground. Perform TEST VER-1.
  7. If resistance is more than 10 ohms, measure resistance of White wire between ECU 24-pin connector terminal No. 2 and diagnostic connector terminal No. 10. If resistance is more than 10 ohms, repair open White wire. Perform TEST VER-1.
  8. If resistance is less than 10 ohms, measure resistance between ECU connector terminal No. 2 (White wire) and ground. If resistance is less than 10 ohms, repair White wire for a short to ground. Perform TEST VER-1.
  9. If resistance is more than 10 ohms, connect a known good DRB adapter to diagnostic connector. Attempt to read faults. If DRB is able to read faults, go to TEST NS-1A.
  10. If DRB cannot read faults, connect a known good DRB. Attempt to read faults. If DRB is able to read faults, perform TEST NS-1A. If DRB cannot read faults, insert a known good program cartridge into DRB.
  11. Try to read faults. If DRB cannot read faults, replace ECU. Perform TEST VER-1 . If DRB is able to read faults, perform TEST NS-1A.
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