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TROUBLESHOOTING ACTIVE STABILITY & TRACTION CONTROL SYSTEM (ASTC) 35C-68 DIAGNOSIS CODE SET CONDITIONS Code No. C1278 • When the solenoid valve relay monitor judges that the solenoid valve relay is turned "ON" Code No. C1279 • When the solenoid valve relay monitor judges that the solenoid valve relay is turned "OFF" PROBABLE CAUSES • Fusible link malfunction • Damaged wiring harness or connector • Malfunction of the hydraulic unit assembly (inte- grated with ASTC-ECU) DIAGNOSIS PROCEDURE STEP 1. M.U.T.-III CAN bus diagnosis. Q: Is the check result normal? YES : Go to Step 3. NO : Repair the CAN bus lines (Refer to GROUP − CAN Bus Diagnostics Table .). On completion, go to Step 2. STEP 2. Diagnosis code recheck after resetting position. (4) Turn the ignition switch to the "ON" position. position. Q: Are the diagnosis codes No.C1278 or C1279 set? YES : Go to Step 3. NO : The procedure is complete. STEP 3. Connector check: A-48 ASTC-ECU Q: Is the check result normal? YES : Go to Step 4. NO : Repair or replace the damaged STEP 4. Fusible link check: Check the fusible link Q: Is the check result normal? YES : Go to Step 6. NO : Go to Step 5. STEP 5. Resistance measurement at A-48 ASTC- ECU connector terminal No.1 and body earth. OK: No continuity Q: Is the check result normal? YES : Replace the fusible link No.21. Then go to Step 9. NO : Repair the wiring harness between the STEP 6. Voltage measurement at A-48 ASTC-ECU ECU connector terminal No.1 and the body earth. OK: Battery voltage Q: Is the check result normal? YES : Go to Step 7. NO : The open circuit may be present in the STEP 7. Resistance measurement at A-48 ASTC- ECU connector terminal No.12 and the body OK: Continuity exists (2 Ω or less) Q: Is the check result normal? YES : Go to Step 8. NO : The open circuit may be present in the earth |