Variable Tumble Control System (VTCS) Check
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 Mazda Protege5, 2002 Mazda Protege, 2002 Mazda Millenia, 2002 Mazda MX-5 Miata, and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- Connect NGS scan tool to DLC-2. Select ECT PID. Ensure ECT is 149°F (65°C) or less. Start engine. VTCS shutter valve actuator rod should be pulled. If rod is pulled, go to next step. If rod is not pulled, inspect following:
- VTCS shutter valve actuator
- VTCS delay valve
- VTCS chamber
- VTCS control solenoid valve
- Vacuum hoses
- Wiring harness and connectors between PCM, VTCS solenoid valve and main relay.
Repair or replace wiring harness or components as necessary. See WIRING DIAGRAMS article.
- Select RPM PID. Inspect VTCS shutter valve actuator rod operation. See VTCS SHUTTER VALVE ROD OPERATION (MIATA 1.8L & PROTEGE, PROTEGE5 & 626 2.0L)
table. If rod operation is not as specified, check following:
- VTCS shutter valve actuator
- VTCS delay valve
- VTCS chamber
- VTCS control solenoid valve
- Vacuum hoses
- Wire harness and connectors between PCM terminal No. 73, VTCS solenoid valve and main relay.
VTCS SHUTTER VALVE ROD OPERATION (MIATA 1.8L & PROTEGE, PROTEGE5 & 626 2.0L)Application - Engine RPM VTCS Shutter Valve Actuator Miata 1.8L Less Than 3500 Operate More Than 3500 Does Not Operate Protege & Protege5 2.0L Less Than 3000 Operate More Than 3000 Does Not Operate 626 2.0L Less Than 3250 Operate More Than 3250 Does Not Operate
For system testing, see appropriate SELF-DIAGNOSTICS article.