Parts for your 2004 Daihatsu Yrv-Camshaft sensor

2004 Daihatsu YRV Camshaft Sensor – What It Does and How To Look After It

Based on technical sources, the 2004 Daihatsu YRV is fitted with a camshaft position sensor. Daihatsu’s Electronic Parts Catalogue (YRV M2 series, K3-VE and K3-VET engines) lists a “Camshaft Position Sensor” on the cylinder head assembly. The Daihatsu/Toyota workshop literature for the K3-VE/DET EFI system describes the ECU using the camshaft sensor input for sequential injection and valve timing control, and the official DTC list for these engines includes P0340/P0341 (Camshaft Position Sensor circuit). Denso’s component catalogue also supplies a 3‑pin Hall‑effect cam sensor application for the YRV 1.3 (2001–2005). So for a 2004 YRV, this sensor is absolutely relevant and used.

For the 2004 Daihatsu YRV, the camshaft sensor is the ECU’s way of knowing exactly where the cam is in its rotation. That timing info lets the car do clever things like fire injectors sequentially, fine‑tune ignition timing, and manage variable valve timing where fitted. When the sensor goes out of whack, the ECU may fall back to a safe strategy, which can mean hard starts, lumpy idle, flat spots, and a glowing check‑engine light.

It’s not a routine “replace by kilometres” service item, but it’s smart to give it a look during major services (around 100,000–150,000 km). A quick visual of the sensor body on the cylinder head, the 3‑pin plug, and the wiring loom can head off dramas. Oil weep from the sensor O‑ring, heat‑baked wiring, or a loose connector are common culprits behind dodgy readings.

Typical hints the YRV’s cam sensor needs attention include:

• Long crank or no‑start, especially when hot
• Rough idle, misfire under load, or poor fuel economy
• OBD faults such as P0340 or P0341

If replacement’s on the cards, it’s a straightforward driveway job for many owners:

1. Disconnect the battery negative.
2. Unplug the 3‑pin connector and remove the retaining bolt.
3. Twist and lift the sensor out, swap the O‑ring if it’s flattened or brittle.
4. Seat the new sensor carefully, reconnect, and tighten the bolt to factory spec (don’t overtighten).
5. Clear codes and road‑test.

Use a quality OEM‑equivalent (Denso or genuine Daihatsu) to avoid nuisance faults. Keeping the connector clean and routing the loom away from hot or sharp edges will help the sensor live a long, trouble‑free life. If the light comes back after fitting, check wiring continuity and earths before condemning the new part.

FAQs

How do you tell if the camshaft sensor is failing on a 2004 YRV?
Owners usually notice longer cranking, a stumble off the line, or a check‑engine lamp with codes like P0340/P0341. If it starts fine cold but plays up hot, that’s another giveaway. Scanning live data for a stable cam signal versus engine speed helps confirm it.

Is it safe to drive with a bad camshaft sensor?
It may run in a limited mode, but it can stall, be hard to restart, and chew more fuel. For safety and to avoid being stranded, it’s best to sort it promptly rather than soldiering on.

Does the YRV need a relearn after replacing the cam sensor?
Generally no special relearn is required. Clear fault codes, start the engine, let it idle to operating temp, and take a short drive so the ECU can adapt. If faults return, recheck the connector, O‑ring seating, and wiring.