Parts for your 2001 Daihatsu Yrv-Map sensor

2001 Daihatsu YRV MAP sensor: what it does, where it sits, and how to look after it

On the 2001 Daihatsu YRV (K3-VE 1.3-litre and K3-VET 1.3-litre turbo), a manifold absolute pressure (MAP) sensor is fitted and used by the ECU for load calculation. This is documented in Daihatsu’s YRV Engine Control (EFI) service literature and parts listings that identify a “Sensor, manifold absolute pressure” for these engines (commonly referenced under Daihatsu/Denso part numbers such as 89421-97xxx/079800-xxxx). Technical catalogues from Denso also list a MAP/boost pressure sensor for the K3-series engines, supporting its presence on both naturally aspirated and turbo YRVs.

The MAP sensor’s job is to tell the ECU how much pressure (or vacuum) is in the intake manifold. Paired with engine speed and air temperature, it lets the ECU work out how much air is entering the engine so it can set fuelling and ignition timing spot-on. On the K3-VET turbo, the sensor also reports boost so the ECU can manage torque and protect the engine. A healthy MAP sensor helps the YRV start cleanly, idle evenly, pull smoothly through the revs, and keep fuel economy in check.

Typical signs the MAP sensor or its vacuum path isn’t happy include a lumpy idle, flat spots under load, thirsty fuel use, black smoke on accel, and an engine light with codes like P0105–P0108. Before swapping parts, it pays to check the basics: ensure the vacuum hose to the sensor isn’t split, soft, or oil-contaminated, confirm the connector is tight and the wiring isn’t chafed. With a scan tool, the MAP reading with key-on/engine-off should be close to local barometric pressure, then drop at idle as manifold vacuum rises.

Replacement is straightforward: disconnect the plug, undo the retaining screw(s), and transfer the unit, ensuring the O-ring or hose is fresh and seated. If there’s a separate vacuum hose, replace it with fuel/EFI-rated hose and secure with proper clamps. Avoid poking tools into the sensor port, if cleaning is attempted, only use electronics-safe cleaner and let it dry fully—many techs prefer replacement over cleaning if readings are erratic. Sticking with quality OEM-equivalent (Denso) units helps avoid drivability gremlins. As part of routine servicing, a quick visual of the hose and connector, plus a scan of MAP kPa at idle and under a gentle snap throttle, is a simple way to keep the YRV happy.

• Common symptoms: rough idle, hesitation, heavy fuel use, black smoke, MIL on (P0105–P0108).
• Quick checks: vacuum hose integrity, secure connector, live-data MAP plausibility.
• Good practice: replace brittle hoses, avoid harsh cleaners, use quality replacement parts.

Popular questions

Where is the MAP sensor on a 2001 Daihatsu YRV?
It’s typically mounted on or near the intake manifold, or on the firewall with a short vacuum hose to the manifold. Look for a small rectangular sensor with a three-pin plug and either an O-ringed spigot into the manifold or a single vacuum hose.

What fault codes point to a bad MAP sensor on a YRV?
Common ECU codes are P0105 (MAP/Baro circuit), P0106 (range/performance), P0107 (low input) and P0108 (high input). These can also pop up from split hoses, poor grounds, or wiring faults, so verify with live data and basic checks before replacing the sensor.

Can the MAP sensor be cleaned, or should it be replaced?
Light contamination can sometimes be cleared with electronics-safe cleaner, but avoid touching the sensing port. If readings remain implausible or codes return, replacement with an OEM-equivalent sensor is the reliable fix. Always renew any aged vacuum hose at the same time.