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Home >> Jeep >> 1996 >> Grand Cherokee Limited, 5.2 Y >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Controls - Tests W/Codes - 2.0L/2.0L Turbo) >> Diagnostic Charts >> Test Dr-22A - Checking DRB Communication

Test Dr-22A - 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 screen is not blank, go to step 4). If DRB screen is blank, disconnect DRB adapter from diagnostic connector. Turn ignition off. Measure resistance between diagnostic connector terminal No. 12 (Black wire) and ground. If resistance is less than 10 ohms, go to next step. If resistance is more than 10 ohms, repair open circuit in Black wire. Perform TEST VER-2 .
  2. Inspect DRB adapter Red battery lead for good battery connection. Repair as necessary, and perform TEST VER-2. If battery connection is okay, connect a known good DRB adapter to diagnostic connector.
  3. Reconnect DRB. If DRB display is not blank, perform TEST DR-1A. If DRB display is blank, connect known good DRB to adapter. If DRB display is not blank, perform TEST DR-1A. If DRB display is blank, insert known good program cartridge into DRB. If DRB display is operational, perform TEST DR-1A . If DRB display is not operational, go to step 1).
  4. Disconnect DRB adapter from diagnostic connector. Turn ignition off. Disconnect Electronic Control Unit (ECU) 24-pin connector. Measure resistance of Yellow wire between ECU 24-pin connector terminal No. 1 and diagnostic connector terminal No. 1.
  5. If resistance is more than 10 ohms, repair open circuit in Yellow wire. Perform TEST VER-2. If resistance is less than 10 ohms, measure resistance between ECU connector terminal No. 1 (Yellow wire) and ground. If resistance is less than 10 ohms, repair short to ground in Yellow wire. Perform TEST VER-2.
  6. 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 less than 10 ohms, repair short to ground in White wire. Perform TEST VER-2. 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, perform TEST DR-1A.
  7. If DRB is not able to read faults, connect a known good DRB to adapter. Attempt to read faults. If DRB is able to read faults, perform TEST DR-1A. If DRB is not able to read faults, insert a known good program cartridge in DRB.
  8. Attempt to read faults. If DRB is not able to read faults, replace ECU. Perform TEST VER-2. If DRB is able to read faults, perform TEST DR-1A .
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