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HOMESERVICE MANUALSOLDSMOBILE1998ACHIEVA 3.1 M, 4T40E/MN4REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 4 (ANTI-LOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEM - BOSCH 5.3)DIAGNOSIS & TESTINGPRE-DIAGNOSTIC INSPECTION
1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4

Pre-Diagnostic Inspection

1998 Oldsmobile Achieva 3.1 M, 4T40E/MN4SECTION Pre-Diagnostic Inspection
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 1999 Pontiac Grand Prix, 1999 Pontiac Firebird, 1999 Oldsmobile Intrigue, 1999 Chevrolet Camaro, and 1998 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

When checking potential ABS/TCS faults, check following before performing diagnostic trouble code testing.

  1. Check ABS and HAZARD fuses in instrument panel fuse block located behind left side of instrument panel.
  2. Check ABS fuse in power distribution fuse block located in left front of engine compartment.
  3. Check all ABS/TCS wiring harness connectors for proper engagement, loose wires or terminals and/or corrosion. Check harness routing paying particular attention to wheel speed sensor wiring harness routing.
  4. Ensure brake switches are properly adjusted (if necessary).
  5. Check brake system for leaks and proper fluid level.
  6. Check ABS/TCS ground circuit for clean tight connections. Ground is located in left front of engine compartment, in body and instrument panel wiring harness.
  7. Always perform diagnostic system check before diagnosing DTCs. See DIAGNOSTIC SYSTEM CHECK.

Solenoid valve relay is turned off by EBTCM when a diagnostic trouble code is set. Using scan tool to monitor data list when trouble codes are set, solenoid will be displayed as being off. This is normal and not an indication of a system malfunction.

EBTCM performs an automatic test during each ignition cycle when vehicle speed reaches 4 MPH in either forward or reverse gears. Automatic test cycles each solenoid valve, pump motor and relays to check component operation. EBTCM will set a trouble code if an error is detected. Test may be felt and heard while it is taking place and is a normal mode of operation.

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.