FixVault
Home › Plymouth › 1992 › Voyager Base, Standard › Repair and Diagnosis › Brakes › Traction Control › Anti-Lock Brake System › Self-Diagnostic Tests › Test 17A, Modulator Fault

Test 17A, Modulator Fault

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION  . For wiring diagram, see WIRING DIAGRAM  .
  1. Turn ignition on. Disconnect modulator connector. See Figure . Check and clean connector terminals, and repair if necessary. Using DRB-II, actuate left front build valve.
  2. Hydraulic valve tests will cycle on and off for about 7 minutes. It may be necessary to reactivate test if too much time elapses. If DRB-II shows left front build valve actuating, go to next step. If DRB-II does not show left front build valve actuating, replace CAB. After repairs are complete, perform TEST VER-1A  .
  3. Select DRB-II voltmeter mode. See DRB-II VOLT/OHMMETER MODE under DRB-II TEST FUNCTIONS. Ensure DRB-II is still actuating left front build valve. Probe modulator female connector terminal No. 3 (Brown/White wire). See Figure . If voltage is switching between zero to more than 12 volts, go to next step. If voltage is not switching between zero to more than 12 volts, perform TEST 17B  .
  4. Using DRB-II, stop actuation test. Using DRB-II, actuate right front build valve. If DRB-II shows right front build valve actuating, go to next step. If DRB-II does not show right front build valve actuating, replace CAB. After repairs are complete, perform TEST VER-1A  .
  5. Select DRB-II voltmeter mode. See DRB-II VOLT/OHMMETER MODE under DRB-II TEST FUNCTIONS. Ensure DRB-II is still actuating right front build 666valve. Probe modulator female connector terminal No. 8 (Brown/Red wire). If voltage is switching between zero to more than 12 volts, go to next step. If 6voltage is not switching between zero to more than 12 volts, perform TEST 17C  . 6 6) Using DRB-II, stop actuation test. Using DRB-II, actuate rear 6build valve. If DRB-II shows rear build valve actuating, go to next step. If DRB-II does not show rear build valve actuating, replace CAB. After repairs are complete, perform TEST VER-1A  . 6 7) Select DRB-II voltmeter mode. Ensure DRB-II is still actuating rear build valve. Probe modulator female connector terminal No. 9 (Brown/Tan wire). If voltage is switching between zero to more than 12 volts, go to next step. If voltage is not switching between zero to more than 12 volts, perform TEST 17D  .
  6. Stop actuation test. Using DRB-II, actuate left front decay valve. If DRB-II shows left front decay valve actuating, go to next step. If DRB-II does not show left front decay valve actuating, replace CAB. After repairs are complete, perform TEST VER-1A  .
  7. Select DRB-II voltmeter mode. Ensure DRB-II is still actuating left front decay valve. Probe modulator female connector terminal No. 4 (Dark Green/Black wire). If voltage is switching between zero to more than 12 volts, go to next step. If voltage is not switching between zero to more than 12 volts, perform TEST 17E  .
  8. Stop actuation test. Using DRB-II, actuate right front decay valve. If DRB-II shows right front decay valve actuating, go to next step. If DRB-II does not show right front decay valve actuating, replace CAB. After repairs are complete, perform TEST VER-1A  .
  9. Select DRB-II voltmeter mode. Ensure DRB-II is still actuating right front decay valve. Probe modulator female connector terminal No. 7 (Dark Green/White wire). If voltage is switching between zero to more than 12 volts, go to next step. If voltage is not switching between zero to more than 12 volts, perform TEST 17F  .
  10. Stop actuation test. Using DRB-II, actuate rear decay valve. If DRB-II shows rear decay valve actuating, go to next step. If DRB-II does not show rear decay valve actuating, replace CAB. After repairs are complete, perform TEST VER-1A  .
  11. Select DRB-II voltmeter mode. Ensure DRB-II is still actuating rear decay valve. Probe modulator female connector terminal No. 2 (Dark Green/Orange wire). If voltage is switching between zero to more than 12 volts, go to next step. If voltage is not switching between zero to more than 12 volts, perform TEST 17G  .
  12. Stop actuation test. Using DRB-II, actuate left front isolation valve. If DRB-II shows left front isolation valve actuating, go to next step. If DRB-II does not show left front isolation valve actuating, replace CAB. After repairs are complete, perform TEST VER-1A  .
  13. Select DRB-II voltmeter mode. Ensure DRB-II is still actuating left front isolation valve. Probe modulator female connector terminal No. 5 (White/Light Green wire). See Figure . If voltage is switching between zero to more than 12 volts, go to next step. If voltage is not switching between zero to more than 12 volts, perform TEST 17H  .
  14. Stop actuation test. Using DRB-II, actuate right front isolation valve. If DRB-II shows right front isolation valve actuating, go to next step. If DRB-II does not show right front isolation valve actuating, replace CAB. After repairs are complete, perform TEST VER-1A  .
  15. Select DRB-II voltmeter mode. Ensure DRB-II is still actuating right front isolation valve. Probe modulator female connector terminal No. 6 (White/Tan wire). If voltage is switching between zero to more than 12 volts, go to next step. If voltage is not switching between zero to more than 12 volts, perform TEST 17J  .
  16. Stop actuation test. Using DRB-II, actuate left rear isolation valve. If DRB-II shows left rear isolation valve actuating, go to next step. If DRB-II does not show left rear isolation valve actuating, replace CAB. After repairs have been completeed, perform TEST VER-1A  .
  17. Select DRB-II voltmeter mode. Ensure DRB-II is still actuating left rear isolation valve. Probe modulator female connector terminal No. 10 (White/Black wire). If voltage is switching between zero to more than 12 volts, go to next step. If voltage is not switching between zero to more than 12 volts, perform TEST 17K  .
  18. Stop actuation test. Using DRB-II, actuate right rear isolation valve. If DRB-II shows right rear isolation valve actuating, go to next step. If DRB-II does not show right rear isolation valve actuating, replace CAB. After repairs are complete, perform TEST VER-1A  .
  19. Put DRB-II in voltmeter mode. Ensure DRB-II is still actuating right rear isolation valve. Probe modulator female connector terminal No. 1 (White/Pink wire). If voltage is switching between zero to more than 12 volts, go to next step. If voltage is not switching between zero to more than 12 volts, perform TEST 17L  . Stop actuation test. Replace complete hydraulic assembly. After repairs are complete, perform TEST VER-1A  .
About FixVault