Pump Motor Circuit Not Working Properly
- Disconnect ABS pump/motor 4-pin connector at hydraulic control unit. Ensure jumper wire is still connected between Red/Dark Green wire and Tan/Black wire (Brown/White wire and Red/Dark Blue wire on Grand Cherokee and Grand Wagoneer or Tan wire and Red/Brown wire on Wrangler) at ABS pump/motor relay socket.
- With DRB-II in voltmeter mode, probe Tan/Black wire (Brown/White wire on Grand Cherokee and Grand Wagoneer or Tan wire on Wrangler) at ABS pump/motor 4-pin harness connector. If voltage is more than 9 volts, go to next step. If voltage is less than 9 volts, repair open Tan/Black wire (Brown/White wire on Grand Cherokee and Grand Wagoneer or Tan wire on Wrangler) to 4-pin harness connector. Perform VERIFICATION TEST VER-1A.
- Turn ignition off. With DRB-II in ohmmeter mode, probe Black/Tan ground wire (Black ground wire on Grand Cherokee and Grand Wagoneer) at ABS pump/motor 4-pin harness connector. If resistance is less than 5 ohms, replace ABS pump/motor assembly. Perform VERIFICATION TEST VER-1A. If resistance is more than 5 ohms, repair open in Black/Tan ground wire (Black ground wire on Grand Cherokee and Grand Wagoneer). Perform VERIFICATION TEST VER-1A.