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Home >> Oldsmobile >> 1999 >> Intrigue GL, 3.5 H >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Anti-Lock Brake System With Traction Control System - Abs-VI) >> Diagnostic Tests >> DTC C1246: Rear Abs Channel Will Not Move

DTC C1246: Rear Abs Channel Will Not Move

WARNING: This page is about a different variant/trim than selected.
  1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK. After performing diagnostic system check, go to next step.
  2. Check ABS motor pack connector and EBCM/EBTCM connector for proper wire color/connector cavity combination. If wires are properly located in connector cavities, go to next step. If wires are not properly located in connector cavities, go to step 11)  .
  3. Raise and suitably support the vehicle. Verify that the rear wheels are approximately 15 cm (6 in) above the floor. Turn ignition on, with engine off. Pump brake pedal until firm to deplete brake booster vacuum reservoir. Install scan tool. Apply firm downward pressure on the brake pedal. Using scan tool, select MISC TESTS (SPECIAL FUNCTIONS), and then select MANUAL CONTROL. Using scan tool, select REAR ABS MOTOR APPLY of rear ABS channel, and apply rear ABS motor. Have an assistant attempt to rotate the rear wheels by hand. If it is possible to rotate the rear wheels by hand, Go to step 5)  . If it is not possible to rotate rear wheels by hand, go to next step.
  4. Maintain firm pressure on brake pedal. Using scan tool, select rear ABS MOTOR RELEASE, and then release rear ABS motor. If it is possible to rotate the rear wheels by hand, go to step 17)  . If it is not possible to rotate rear wheels by hand, go to next step.
  5. Remove firm pressure from brake pedal. Using scan tool, select rear ABS MOTOR APPLY, and then apply rear ABS motor. Observe rear ABS motor commanded current and rear ABS motor feedback current. If feedback current momentarily drops below 8 amps, go to next step. If feedback current did not momentarily drops below 8 amps, go to step 10)  .
  6. Using scan tool, exit MANUAL CONTROL. Turn ignition off. Disconnect ABS motor pack connector. Disconnect EBCM/EBTCM connector. See EBCM/EBTCM LOCATION  under REMOVAL & INSTALLATION. Using DVOM, measure resistance between rear motor high circuit and rear motor low circuit of EBCM/EBTCM connector. If resistance is infinite, go to next step. If resistance is not infinite, go to step 12)  .
  7. Using DVOM, measure resistance between rear motor high circuit and rear motor low circuit of motor pack connector (component side). If resistance is 0.2-1.5 ohms, go to next step. If resistance is not 0.2-1.5 ohms, go to step 13)  .
  8. Check ABS motor pack connector and EBCM/EBTCM connector for poor terminal contact, corrosion or damage. If connectors are faulty, go to step 15)  . If connectors are okay, go to next step.
  9. Turn ignition off. Reconnect EBCM/EBTCM connector. Reconnect ABS modulator/motor pack assembly connector. Start engine without pressing brake pedal. Allow engine to run for at least 10 seconds. Repeat ignition cycle sequence 2 more times. Using scan tool, display DTCs. If DTC C1246 has set within last 3 ignition cycles, go to step 16)  . If DTC has not set within last 3 ignition cycles, go to step 17)  .
  10. Using scan tool, select MISC TESTS. Using scan tool, perform GEAR TENSION RELIEF. Turn ignition off. Remove ABS modulator/motor pack assembly from vehicle. See ABS MODULATOR/MOTOR PACK ASSEMBLY under REMOVAL & INSTALLATION. Separate modulator from motor pack. Grasp rear modulator gear and attempt to rotate gear. Rear gear is middle gear when modulator is installed in vehicle. If gear can be rotated 5-9 full revolutions lock to lock, go to step 13)  . If gear cannot be rotated 5-9 full revolutions lock to lock, go to step 14)  .
  11. Position proper wires into proper connector cavities. See WIRING DIAGRAM. After repairs, perform DIAGNOSTIC SYSTEM CHECK .
  12. Repair short between rear motor high circuit and rear motor low circuit. After repairs, perform DIAGNOSTIC SYSTEM CHECK .
  13. Replace motor pack. After repairs, perform DIAGNOSTIC SYSTEM CHECK .
  14. Replace modulator. After repairs, perform DIAGNOSTIC SYSTEM CHECK .
  15. Replace all faulty terminals or connectors. After repairs, perform DIAGNOSTIC SYSTEM CHECK .
  16. Replace EBCM/EBTCM. See ELECTRONIC BRAKE CONTROL MODULE/ ELECTRONIC BRAKE & TRACTION CONTROL MODULE (EBCM/EBTCM)  under REMOVAL & INSTALLATION. After repairs, perform DIAGNOSTIC SYSTEM CHECK .
  17. Malfunction is not currently present. An intermittent may be caused by a mechanical system component sticking, binding, or slipping. Frequency of malfunction can be determined by using enhanced diagnostic function of scan tool. DTC C1246 may set after ABS modulator disassembly if modulator pistons are positioned at bottom of bore.

Check for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal-to-wiring connections, or damaged wiring harness. After diagnosis is complete, clear DTCs and test drive vehicle for 3 drive cycles to verify DTC does not reset. Drive cycle consists of starting vehicle, driving vehicle faster than 10 MPH, stopping vehicle, and then turning ignition off.

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