Parts for your 1998 Daihatsu Terios-Camshaft sensor

1998 Daihatsu Terios camshaft sensor: is it fitted, and what to do about it

For the 1998 Daihatsu Terios (J100 series, 1.3-litre HC-EJ engine), there isn’t a separate, bolt-on camshaft position sensor. Technical literature shows the engine uses a distributor with internal pickup signals to tell the ECU what it needs, rather than a standalone cam sensor on the cylinder head. This is documented in the Daihatsu Terios J100 Series Service Manual (Engine Electrical/EFI), the Daihatsu HC‑EJ Engine Repair Manual (Ignition System), and Autodata technical data for the 1997–2000 Terios, all of which list a distributor-based ignition/engine speed arrangement with NE and G signals and no separate camshaft sensor unit.

Why it isn’t used is down to the ignition and fuel system design of the period. The distributor is driven off the camshaft and houses pick-ups that generate two key signals: NE (engine speed) and G (cylinder reference). Because the distributor is mechanically locked to the cam, the G signal effectively serves the same purpose as a cam position reference. The ECU can then run batch or semi‑sequential injection and control ignition timing without needing an external cam sensor. Daihatsu only moved to a separate camshaft sensor on later engines that went distributorless (DIS) with coil‑on/coil‑pack systems.

So, if someone is hunting a “camshaft sensor” on a 1998 Terios, the part they actually need to check is the distributor assembly and its internal cam-angle pick-up. Faults that feel like a dud cam sensor are far more likely to be:

• Wear in the distributor shaft or bearing causing erratic G/NE signals
• A failing internal pick-up/igniter module
• Damaged wiring or poor earths between the distributor and ECU

Practical servicing advice for this model: inspect the distributor cap and rotor, confirm shaft play under the bonnet with the engine off, and scope or meter the NE/G signal output if available. If the internal sensor has failed, most workshops replace or recondition the distributor as a unit, as individual internal parts can be hard to source. After any distributor work, set base timing to factory spec using a timing light and the correct diagnostic bridge procedure from the service manual. That’ll keep the little Terios running sweet, whether it’s tackling city streets or a cheeky gravel road.

Does a 1998 Daihatsu Terios have a camshaft position sensor?

No separate unit. The cam reference is generated inside the distributor via the “G” signal. That’s why no standalone cam sensor is shown in the factory wiring or parts lists for the 1998 model.

What symptoms mimic a bad camshaft sensor on a 1998 Terios?

Hard starting, misfires, rough idle and intermittent stalling can all stem from a worn distributor, a failing internal pick-up/igniter, or wiring faults. These mimic the same drivability issues a failed cam sensor would cause on newer, distributorless engines.

How is a “cam sensor” fault fixed on this model?

Diagnosis focuses on the distributor: check cap/rotor, shaft play, and signal integrity. If the internal pick-up is faulty, replace or refurbish the distributor, then set base timing to spec. There’s no separate cam sensor to replace.