Parts for your 1999 Daihatsu Gran move-Knock sensor

1999 Daihatsu Gran Move Knock Sensor — Is It Fitted?

Short answer: for Australian and New Zealand–delivered 1999 Daihatsu Gran Move models, a knock sensor isn’t fitted and isn’t part of the engine management. This conclusion is based on technical sources that show no knock sensor in the ignition or engine loom for the HC-EJ (1.3) and HD-EP (1.6) engines used in this model year. Referenced materials include the Daihatsu Pyzar/Gran Move G300 Series Service Manual (Engine Electrical), the Daihatsu Electronic Parts Catalogue (G303/G311 variants), and Autodata AU/NZ wiring diagrams of the period, all of which omit a knock sensor component, wiring branch, or ECU “KNK” input for these engines. Some late Japanese‑domestic Pyzar variants equipped with the K3-VE engine did utilise a knock sensor, but that engine wasn’t supplied in the typical AU/NZ ’99 Gran Move.

Why wasn’t a knock sensor used on the 1999 Gran Move? The engines in question run a conventional distributor-based ignition with ECU mapping set conservatively for local fuel quality. With fuelling and spark managed via fixed maps and feedback from other sensors, the calibration is designed to avoid detonation without the need for real-time knock detection. Emissions and OBD requirements in AU/NZ at the time also didn’t mandate knock sensing for these small-capacity engines, keeping the system simple and cost-effective.

• Key sensors used instead: MAP (manifold pressure), TPS (throttle position), ECT (coolant temp), IAT (intake air temp), and O2 (oxygen sensor).
• Ignition architecture: distributor with ECU control and a set base timing, no dedicated knock input in the ECU pinout.

What does this mean for servicing? There’s no knock sensor to replace or maintain on a 1999 Gran Move with HC‑EJ or HD‑EP. If the driver notices pinging under load, the fix isn’t to swap a sensor, it’s to check base timing with a timing light, verify quality fuel (try a higher octane if needed), ensure the cooling system is healthy, and look for carbon build-up. Vacuum leaks, a lazy EGR (where fitted), or a tired distributor/ignition coil can also contribute to spark knock on these engines.

For owners wondering where a knock sensor would live on other cars: typically it’s a small threaded sensor on the block under the intake, near cylinders 2–3. On the 1999 Gran Move HC‑EJ/HD‑EP, there’s no connector or boss used for that purpose, which aligns with the factory diagrams and parts listings for AU/NZ models.

Does a 1999 Daihatsu Gran Move have a knock sensor?

No. On AU/NZ-spec 1999 Gran Move models with the HC-EJ (1.3) or HD-EP (1.6) engine, there’s no knock sensor in the harness, ECU pinout or parts listings. Some late JDM Pyzar variants with the K3‑VE engine did have one, but that setup wasn’t common to local ’99 Gran Moves.

How does the Gran Move prevent pinging without a knock sensor?

It relies on conservative ignition mapping, correct base timing and feedback from other sensors (MAP, ECT, IAT, O2). If pinging occurs, check timing, run quality petrol, verify the cooling system, and inspect for vacuum leaks or carbon build-up. A worn distributor or coil can also cause detonation under load.

Where would a knock sensor be if one were fitted?

On many engines, it’s bolted to the block under the intake manifold near the middle cylinders. The ’99 Gran Move HC‑EJ/HD‑EP has no such sensor or connector there, which matches the factory wiring and EPC for AU/NZ vehicles.