Anti-Lock Brake System & Traction Control System: Diagnosis: Notes
NOTE:
To diagnose ABS/TCS system, manufacturer recommends using Tech 1 Scan Tester (94-00101-A) with 1988-94 Brake Cartridge. Some diagnostic procedures will require EBCM/EBTCM Pinout Box (J-38716) and High-Impedance Digital Multimeter (J-39200) or equivalent. When using Tech 1 for diagnostics, ABS system is disabled by EBCM. ANTILOCK indicator will come on indicating only normal power assisted braking is available. After diagnostics have been completed using Tech 1, disconnect Tech 1 from DLC connector and turn ignition off for a least 10 seconds before road testing. This procedure is done to reset EBCM.
The EBCM/EBTCM has self-diagnostic capability, which can detect system failures. Fault codes stored by EBCM/EBTCM can be displayed using Tech 1 scan tester. There are no provisions for flash code diagnostics.
Begin ABS/TCS diagnosis with PRE-DIAGNOSTIC INSPECTION procedure. If failures are found during pre-diagnostic inspection, perform necessary repairs, and proceed with ABS/TCS FUNCTIONAL CHECK. See Figure .
If no failures are found during pre-diagnostic inspection, go to ABS/TCS FUNCTIONAL CHECK. See Figure . The ABS/TCS FUNCTIONAL CHECK will either indicate ABS/TCS is functioning properly or direct technician to various diagnostic procedures such as diagnostic charts, symptom diagnosis or BRAKE warning light diagnosis.