Variable Induction System: Testing and Inspection
Variable Tumble Control System (VTCS) Inspection1. Connect the SSTs (WDS or equivalent) to the DLC.
2. Access ECT PID.
3. Verify ECT PID is 65 °C {149 °F} or less.
4. Start the engine.
5. Verify that the VTCS actuator rod is pulled.
6. If the rod is not pulled, inspect the following.
- VTCS shutter valve actuator
- VTCS delay valve stud
- VTCS chamber passage clogged
- Vacuum hose disconnected
- VTCS swirl control solenoid valve stuck
- Wiring harness damaged and/or connectors disconnected (Main relay-VTCS solenoid valve-PCM terminal 42)
7. Access RPM.
Rod Operation:
8. Inspect the rod operation under the following condition.
- If the rod operation is not as specified, inspect for the following:
- VTCS shutter valve actuator stuck
- VTCS delay valve stuck
- VTCS chamber passage clogged
- Vacuum hose disconnected
- VTCS solenoid valve stuck
- Wiring harness damaged and/or connectors disconnected (Main relay-VTCS solenoid valve-PCM terminal 42)