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ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS TSB Revision ANTI-LOCK BRAKING SYSTEM (ABS) 35B-56 DTC C1278 (Valve relay OFF failure) • After the ABS-ECU turned on the valve relay, the solenoid valve is not energized (valve relay OFF DTC C1278 (Valve relay ON failure) • After the ABS-ECU turned off the valve relay, the solenoid valve still remains energized (valve relay . TROUBLESHOOTING HINTS (The most Currect trouble • Damaged wiring harness or connector • Malfunction of the hydraulic unit (integrated with ABS-ECU) . Past trouble Carry out diagnosis with particular emphasis on con- ). . DIAGNOSIS Required Special Tools: • MB991958: Scan Tool (MUT-III Sub Assembly) • MB991824: Vehicle Communication Interface (V.C.I.) • MB991827: MUT-III USB Cable • MB991910: MUT-III Main Harness A • MB991970: ABS Check Harness STEP 1. Using scan tool MB991958, diagnose the CAN bus CAUTION To prevent damage to scan tool MB991958, always turn the YES : Go to Step 3. AC305412 AB MB991910 DATA LINK CONNECTOR MB991824 MB991827 |