Parts for your 2003 Daihatsu Yrv-Camshaft sensor

2003 Daihatsu YRV Camshaft Sensor — Purpose, faults, and servicing tips

Yes, the 2003 Daihatsu YRV is fitted with a camshaft position sensor. Technical sources including the Daihatsu YRV (J102/J122) Workshop Manual engine control section, the model’s Electrical Wiring Diagram for K3‑VE/K3‑VET engines (where it’s described as the “phase” sensor), and Daihatsu’s Electronic Parts Catalogue all show a three‑wire camshaft position sensor mounted on the cylinder head. Industry data tools used in AU/NZ workshops (e.g., Autodata/HaynesPro) also list DTCs P0340/P0341 for this vehicle, which relate specifically to the camshaft position sensor circuit and signal performance.

This little sensor does a big job. It tells the ECU exactly where the camshaft is in its rotation, so the engine can time fuel injection and ignition precisely, and keep variable valve timing behaving itself. When it goes out of spec, owners may notice hard starts (especially warm), a lumpy idle, flat spots, poor fuel economy, and the odd stall. The check‑engine light will generally pop on, and scan tools often log P0340 or P0341.

It’s not a scheduled replacement item in normal servicing, most last a long time. But on a 2003 YRV, age and heat can make the sensor itself, its O‑ring, or the connector a bit grumpy. A quick visual under the bonnet goes a long way: look for oil wicking into the plug, brittle loom insulation, or a loose retaining bolt. If there’s oil inside the connector, clean it, replace the O‑ring, and recheck.

• Typical symptoms: hard starting, misfire at cruise, rough idle, increased fuel use, VVT faults, and DTCs P0340/P0341.
• Basic checks first: battery health, engine earths, cam sensor plug fitment, and loom rub‑through near the head.
• Replacement tips: use a quality sensor (Denso/NTK‑equivalent), fit a fresh O‑ring, and lightly oil it before install. Tighten the retaining fastener to small fastener torque (don’t overdo it).
• After fitting: clear codes and road test. The YRV’s Denso ECU typically doesn’t need a special relearn, it will adapt on the fly.

If the car is still crank‑no‑start after replacement, check the crank sensor and timing integrity as well—these work as a pair. For most YRV owners, swapping the cam sensor is a straightforward driveway job with a 10 mm socket and a bit of patience.

Popular questions

Does a 2003 Daihatsu YRV actually have a camshaft sensor?
It does. Workshop manuals and wiring diagrams for the K3‑VE/K3‑VET engines specify a camshaft (phase) sensor on the cylinder head. Parts catalogues also list it as a serviceable component for this model year.

What are the common signs the camshaft sensor is failing on a YRV?
Owners typically see the check‑engine light with codes P0340/P0341, harder starting, rough idle, a flat spot on take‑off, and sometimes reduced power if VVT control is affected. Fuel economy can worsen too.

Is it safe to keep driving with a dodgy camshaft sensor?
The car may still run, but it can stall, use more fuel, and potentially stress the catalyst with misfires. Best bet is to diagnose sooner rather than later—often it’s a simple swap and code clear.