A training guide for repairing and testing intake manifold pressure sensors on automotive engine control systems.
This guide provides step‑by‑step instructions for inspecting, testing, and diagnosing three types of intake manifold pressure sensors used in vehicle engine control systems. It includes safety precautions, required tools, and detailed measurement procedures using a multimeter and oscilloscope.
The document also outlines the preparation of the training vehicle (Kia Freed) and references specific sensor wiring diagrams and voltage expectations at various engine speeds and vacuum levels. This manual is written in Chinese.
| Vacuum pressure test range | 13.3 kPa (100 mmHg) to 66.7 kPa (500 mmHg) |
|---|---|
| Membrane box sensor idle voltage | ~0.4 V at idle, increasing with engine speed |
| Membrane box sensor voltage without vacuum | ~1.5 V |
The voltage should be about 0.4 V at idle and rise gradually as engine speed increases.
Turn the ignition OFF, disconnect the sensor plug, then turn the ignition ON (engine not started) and measure the voltage between Vc and E2 terminals with the multimeter.