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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 C1242: Rear ESB Will Not Hold Motor

DTC C1242: Rear ESB Will Not Hold Motor

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. Turn ignition on, with engine off. Pump brake pedal until firm to deplete brake booster vacuum reservoir. Install scan tool. Using scan tool, select MISC TESTS, and then select MANUAL CONTROL. Using scan tool, select ABS MOTOR APPLY of rear ABS channel, and apply rear ABS motor. Wait 5 seconds. Apply firm pressure to brake pedal. If brake pedal falls, go to step 9)  . If brake pedal does not fall, go to next step.
  3. 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 10)  .
  4. 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 of rear motor high circuit between motor pack connector (harness side) and EBCM/EBTCM connector. If resistance is 0-1.5 ohms, go to next step. If resistance is not 0-1.5 ohms, go to step 11)  .
  5. Using DVOM, measure resistance of rear motor low circuit between motor pack connector (harness side) and EBCM/EBTCM connector. If resistance is 0-1.5 ohms, go to next step. If resistance is not 0-1.5 ohms, go to step 12)  .
  6. 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 9)  .
  7. Check ABS motor pack connector and EBCM/EBTCM connector for poor terminal contact, corrosion or damage. If connectors are faulty, go to step 13)  . If connectors are okay, go to next step.
  8. 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 C1242 is set in last 3 ignition cycles, go to step 14)  . If DTC C1242 is not set in last 3 ignition cycles, go to step 15)  .
  9. Replace motor pack.
  10. Position proper wires into proper connector cavities.
  11. Repair open or high resistance in rear motor high circuit between motor pack and EBCM/EBTCM.
  12. Repair open or high resistance in rear motor low circuit between motor pack and EBCM/EBTCM.
  13. Replace all faulty terminals or connectors.
  14. Replace EBCM/EBTCM. See ELECTRONIC BRAKE CONTROL MODULE/ ELECTRONIC BRAKE & TRACTION CONTROL MODULE (EBCM/EBTCM)  under REMOVAL & INSTALLATION.
  15. 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. Hydraulic control modulator test function of scan tool may be used to locate an intermittent malfunction associated with ESB.

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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