Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSBUICK2000CENTURY CUSTOMREPAIR AND DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEM WITH TRACTION CONTROL SYSTEM - DELPHI 7DIAGNOSIS & TESTINGDIAGNOSTIC SYSTEM CHECK
2000 Buick Century Custom
Diagnostic System Check
2000 Buick Century CustomSECTION Diagnostic System Check
NOTE:
When using scan tool for diagnostics, ABS/TCS system is disabled by EBCM. ANTI-LOCK indicator will illuminate indicating only normal power assist braking is available. After diagnostics have been completed, disconnect scan tool from Data Link Connector (DLC) and turn ignition off for a least 10 seconds before road testing. This procedure is done to reset EBCM.
If multiple DTCs are displayed, begin diagnosis with DTC that is displayed first. See DIAGNOSTIC TROUBLE CODE DEFINITIONS table. Diagnose all codes in the order displayed by scan tool.
- Connect scan tool to DLC. Turn ignition on. If scan tool powers up, go to next step. If scan tool, does not power up, go to TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE IN DATA LINK COMMUNICATIONS under SYMPTOM TESTS.
- Turn ignition on, with engine off. Using scan tool, attempt to establish communications with PCM and BCM. If scan tool communicates with PCM and BCM, go to next step. If scan tool does not communicate with PCM and BCM, go to TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE IN DATA LINK COMMUNICATIONS under SYMPTOM TESTS.
- Select ABS control module display DTC function on scan tool. If scan tool display any DTCs, go to next step. If scan tool does not display any DTCs, go to SYMPTOM DIAGNOSIS .
- If scan tool display any "U" type DTCs, go to TEST A: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE IN DATA LINK COMMUNICATIONS under SYMPTOM TESTS. If scan tool displays other types of DTC, diagnose affected DTC(s).
DIAGNOSTIC TROUBLE CODE DEFINITIONS
| DTC | (1) Definition | ||
|---|---|---|---|
| B2747 | Traction Control Switch Circuit Low | ||
| C1214 | Solenoid Valve Relay Contact Or Coil Circuit Open | ||
| C1216 | EBCM Commanded Pressure Release Too Long | ||
| C1217 | Pump Motor Shorted To Ground | ||
| C1218 | Pump Motor Shorted To Voltage | ||
| C1221 | Left Front Wheel Speed Sensor Input Signal Is Zero | ||
| C1222 | Right Front Wheel Speed Sensor Input Signal Is Zero | ||
| C1223 | Left Rear Wheel Speed Sensor Input Signal Is Zero | ||
| C1224 | Right Rear Wheel Speed Sensor Input Signal Is Zero | ||
| C1225 | Left Front Excessive Wheel Speed Variation | ||
| C1226 | Right Front Excessive Wheel Speed Variation | ||
| C1227 | Left Rear Excessive Wheel Speed Variation | ||
| C1228 | Right Rear Excessive Wheel Speed Variation | ||
| C1232 | Left Front Wheel Speed Sensor Circuit Open Or Shorted | ||
| C1233 | Right Front Wheel Speed Sensor Circuit Open Or Shorted | ||
| C1234 | Left Rear Wheel Speed Sensor Circuit Open Or Shorted | ||
| C1235 | Right Rear Wheel Speed Sensor Circuit Open Or Shorted | ||
| C1236 | Low System Voltage | ||
| C1237 | High System Voltage | ||
| C1238 | Brake Thermal Model Limit Exceeded | ||
| C1242 | BPMV Pump Motor Circuit Open | ||
| C1243 | BPMV Pump Motor Stalled | ||
| C1247 | Low Brake Fluid Detected | ||
| C1254 | Abnormal Shutdown Detected | ||
| C1255 | EBCM Internal Malfunction | ||
| C1256 | EBCM Internal Malfunction | ||
| C1261 | Left Front Hold Valve Solenoid Malfunction | ||
| C1262 | Left Front Outlet Valve Solenoid Malfunction | ||
| C1263 | Right Front Inlet Valve Solenoid Malfunction | ||
| C1264 | Right Front Outlet Valve Solenoid Malfunction | ||
| C1265 | Left Front Inlet Valve Solenoid Malfunction | ||
| C1266 | Left Rear Outlet Valve Solenoid Malfunction | ||
| C1267 | Right Rear Inlet Valve Solenoid Malfunction | ||
| C1268 | Right Rear Outlet Valve Solenoid Malfunction | ||
| C1272 | Left Front TCS Solenoid Valve Malfunction | ||
| C1274 | Right Front TCS Solenoid Valve Malfunction | ||
| C1276 | Delivered Torque Signal Circuit Malfunction | ||
| C1277 | Requested Torque Signal Circuit Malfunction | ||
| C1278 | TCS Temporarily Inhibited By PCM | ||
| C1291 | Open Brakelight Switch Contacts During Deceleration | ||
| C1293 | DTC C1291 Set In Previous Ignition Cycle | ||
| C1294 | Brakelight Switch Always Active | ||
| C1295 | Brakelight Switch Circuit Open | ||
| C1298 | PCM Class 2 Serial Data Link Malfunction | ||
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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.