Parts for your 1999 Daihatsu Gran move-Map sensor

1999 Daihatsu Gran Move MAP sensor — what it does and how to look after it

Based on factory and industry documentation, the 1999 Daihatsu Gran Move (also known as the Pyzar in some markets) runs a speed–density EFI system that uses a Manifold Absolute Pressure (MAP) sensor. The Daihatsu workshop manual for the M100-series EFI diagnostics includes a MAP sensor test procedure, and the Daihatsu electronic parts catalogue lists a manifold pressure sensor for this model year. Independent service data used by workshops in AU/NZ also specifies a MAP-based setup on the 1.5-litre EFI engines fitted to the Gran Move. So yes — the MAP sensor is relevant and fitted to this vehicle.

On this Daihatsu, the MAP sensor measures intake manifold pressure and helps the ECU figure out engine load. Along with engine speed, intake air temperature and throttle position, that pressure reading lets the ECU calculate how much fuel to inject and how much ignition timing to run. When it’s healthy, cold starts are clean, throttle response is crisp and fuel economy stays on track for everyday commuting.

As part of regular servicing, it’s smart to give the MAP sensor and its vacuum path some attention. Check the small vacuum hose (if fitted) for splits, oil softening or loose clamps. Make sure the sensor’s port isn’t clogged with carbon or oily mist. If cleaning is needed, a few short bursts of electronics-safe or MAF/MAP cleaner on the sensing port is fine — don’t poke the port with wire or soak it in harsh solvents.

Replacement is straightforward if the sensor’s readings are off or it’s throwing codes (you’ll commonly see P0105–P0108). Use an OE-quality unit, swap the O-ring or gasket, and nip the screws up snug — they only need to be firm, not gorilla tight. After refitting, clear codes and, if the battery has been disconnected, let the engine idle until warm so the ECU can relearn. A quick scan-tool check at key-on/engine-off should show near local barometric pressure (around 100 kPa at sea level) and smooth changes with throttle blips.

Service tip for AU/NZ conditions: dusty driving shortens the time between cleans. Pair MAP checks with air filter changes every 10,000–15,000 km, and you’ll avoid most load-sensing dramas like rough idle, rich running and flat spots.

• Watch for tell-tales: heavy fuel use, black smoke, hesitation, hard starts.
• Inspect the vacuum hose and connector each service.
• Keep the throttle body and PCV system tidy to reduce oil vapour fouling.

Popular questions about the 1999 Daihatsu Gran Move MAP sensor

Where is the MAP sensor on a 1999 Gran Move?
It’s typically mounted on or near the intake manifold, either bolted directly to it with an O-ring seal or connected via a short vacuum hose. Look around the throttle body area under the bonnet, you’ll see a small rectangular sensor with a two- or three-pin connector.

What symptoms point to a failing MAP sensor on this model?
Common clues are rough idle, poor fuel economy, hesitation on take-off, black smoke, and an engine light with codes like P0105–P0108. Because the ECU uses MAP for load, a bad reading can make the mixture too rich or too lean, especially noticeable during warm-up or quick throttle changes.

Does the Gran Move use a MAF as well as a MAP?
No — the late-’90s Gran Move uses a speed–density system with a MAP sensor rather than a hot-wire MAF. That’s why the vacuum hose/port integrity and intake air temperature reading are so important for accurate fuelling.