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Home >> Mazda >> 2003 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1512: Variable Tumble Control System Stuck Closed >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Mazda Protege5 and 2002 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  7.
  2. Using scan tool, clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Ensure engine coolant temperature is 68°F (20°). Drive vehicle with engine speed at more than 3000 RPM and mass air flow at less than 45.2 gram/sec. Check for DTCs. If DTC P1512 is present, go to next step. If DTC P1512 is not present, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  3. Check for any other DTC. If any other DTC is present, repair that DTC first. If no other DTC is present, go to next step.
  4. Check VTCS shutter valve actuator operation. See VARIABLE TUMBLE CONTROL SYSTEM - MIATA 1.8L, PROTEGE, PROTEGE5 & 626 2.0L under AIR INDUCTION SYSTEMS in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. If VTCS shutter valve actuator is okay, go to next step. If VTCS shutter valve actuator is faulty, replace VTCS shutter valve actuator. After repair, go to step  7.
  5. Check VTCS solenoid valve operation. See VARIABLE TUMBLE CONTROL SYSTEM - MIATA 1.8L, PROTEGE, PROTEGE5 & 626 2.0L under AIR INDUCTION SYSTEMS in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. If VTCS solenoid valve is okay, go to next step. If VTCS solenoid valve is faulty, replace VTCS solenoid valve. After repair, go to step  7.
  6. Turn ignition switch off. Disconnect PCM 104-pin harness connector. Check for loose, damaged or corroded terminals. If any problem is found, repair as necessary. After repair, go to next step. If no problem is found, go to next step.
  7. Reconnect all connectors. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Using scan tool, ensure ECT PID is less than 68°F (20°C), RPM PID is less than 3000 RPM and MAF PID is less than 45.2 gram/sec. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P1512 is present, replace PCM and go to next step. If DTC P1512 is not present, go to next step.
  8. Cycle ignition switch from off to on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If no other DTCs are present, testing is complete. If any other DTC is present, go to applicable test and repair.
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