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Pump Motor Circuit Not Working Properly

  1. Using an external ohmmeter, measure resistance of ABS pump/motor speed sensor. See Fig 1 . If sensor resistance is 10-35 ohms, go to next step. If resistance is not 10-35 ohms, replace ABS pump/motor assembly. Perform VERIFICATION TEST VER-1A.
  2. Turn ignition on. With DRB-II in voltmeter mode, probe Tan wire (Light Green/Brown wire on Wrangler) at ABS pump/motor 4-pin harness connector. If any voltage is present, repair ABS pump/motor speed sensor Tan wire (Light Green wire on Wrangler) for a short to battery voltage. Perform VERIFICATION TEST VER-1A. If no voltage is present, go to next step.
  3. With DRB-II in voltmeter mode, probe Dark Blue wire (Brown wire on Wrangler) at ABS pump/motor 4-pin harness connector. If any voltage is present, repair ABS pump/motor speed sensor Dark Blue wire (Brown wire on Wrangler) for a short to battery voltage. Perform VERIFICATION TEST VER-1A. If no voltage is present, go to next step.
  4. With DRB-II in ohmmeter mode, probe Tan wire (Light Green/Brown wire on Wrangler) at ABS pump/motor 4-pin harness connector. If resistance is less than 5 ohms, repair ABS pump/motor speed sensor Tan wire (Light Green/Brown wire on Wrangler) for a short to ground. Perform VERIFICATION TEST VER-1A. If resistance is more than 5 ohms, go to next step.
  5. With DRB-II in ohmmeter mode, probe Dark Blue wire (Brown wire on Wrangler) at ABS pump/motor 4-pin harness connector. If resistance is less than 5 ohms, repair ABS pump/motor speed sensor Dark Blue wire (Brown wire on Wrangler) for a short to ground. Perform VERIFICATION TEST VER-1A. If resistance is more than 5 ohms, go to next step.
  6. Using an external ohmmeter, measure resistance of Tan wire (Light Green/Brown wire on Wrangler) between CAB connector terminal No. 49 and ABS pump/motor 4-pin harness connector. If resistance is less than 5 ohms, go to next step. If resistance is more than 5 ohms, repair open ABS pump/motor speed sensor Tan wire (Light Green/Brown wire on Wrangler). Perform VERIFICATION TEST VER-1A.
  7. Using an external ohmmeter, measure resistance of Dark Blue wire (Brown wire on Wrangler) between CAB connector terminal No. 31 and ABS pump/motor 4-pin harness connector. If resistance is less than 5 ohms, replace CAB. Perform VERIFICATION TEST VER-1A. If resistance is more than 5 ohms, repair open ABS pump/motor speed sensor Dark Blue wire (Brown wire on Wrangler). Perform VERIFICATION TEST VER-1A.
Fig 1: Checking ABS Pump/Motor Sensor Resistance
G92B22492