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Test 13F - No Bus Bias (Exc Wrangler)

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 connector terminal identification, see CONNECTOR IDENTIFICATION  in this article. For appropriate wiring diagram, see WIRING DIAGRAMS  section at the end of this article.
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Ignition off during BUS test is the most common cause for this message. If ignition was off, turn ignition on (engine off). If ignition was on, disconnect scan tool from Data Link Connector (DLC). Disconnect Powertrain Control Module (PCM) connector. Using an external voltmeter, check voltage of CCD BUS positive circuit (Violet/Brown wire) between DLC and ground. If voltage is not 2.3-2.6 volts, go to step 3).
  2. If voltage is 2.3-2.6 volts, check voltage of CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) between DLC and ground. If voltage is not 2.3-2.6 volts, go to next step. If voltage is 2.3-2.6 volts, replace scan tool cable or cartridge as necessary. Perform TEST VER-1 .
  3. If vehicle is not equipped with anti-lock brakes, go to TEST 13G . If vehicle is equipped with anti-lock brakes, disconnect Controller Anti-Lock Brake (CAB) module connector. Check resistance between CAB pins No. 23 and 42. If resistance is not 100-140 ohms, replace CAB. Perform TEST VER-1 .
  4. If resistance is 100-140 ohms, check resistance of CCD BUS positive circuit (Violet/Brown wire) between CAB connector terminal No. 23 and DLC. If resistance is more than 5 ohms, repair open Violet/Brown wire. Perform TEST VER-1 .
  5. If resistance is less than 5 ohms, check resistance of CCD BUS negative circuit (White/Black wire on XJ body; White/Gray wire on ZJ body) between CAB connector terminal No. 42 and DLC. If resistance is more than 5 ohms, repair open CCD BUS negative wire. Perform TEST VER-1 . If resistance is less than 5 ohms, go to next step.
  6. If resistance is less than 5 ohms, reconnect scan tool. Using scan tool in voltmeter mode, check voltage on CAB connector terminal No. 53, fused ignition switch output circuit (Light Green/Yellow wire on XJ body; Light Green/Dark Green wire on ZJ body). If voltage is less than 10 volts, repair open fused ignition switch output circuit. Perform TEST VER-1 .
  7. If voltage is more than 10 volts, turn ignition off. Using scan tool in ohmmeter mode, check resistance of CAB connector terminal No. 1, ground circuit (Black wire). If resistance is more than 5 ohms, repair open to ground in Black wire. Perform TEST VER-1 . If resistance is less than 5 ohms, replace CAB. Perform TEST VER-1 .
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