Parts for your 1997 Daihatsu Gran move-Knock sensor

1997 Daihatsu Gran Move knock sensor — what it does and how to look after it

Yes, the 1997 Daihatsu Gran Move (also sold as the Pyzar, model codes G303/G311) is fitted with a knock sensor. This is confirmed by Daihatsu’s factory Service Manual for the HD‑E/HD‑EP engines (Engine Control System section, which shows a “KS” in the ECU diagram and details diagnostics for DTC P0325 Knock Sensor Circuit) and the Daihatsu Electronic Parts Catalogue (EPC) for the same models, which lists a knock sensor mounted to the cylinder block.

On this Gran Move, the knock sensor’s job is to “listen” for detonation (pinging) in the engine. When the sensor picks up vibration frequencies that match knock, the ECU trims ignition timing to protect the motor and keep it running sweet on Aussie and Kiwi fuels, even on hot days or under load. That means better driveability, safer combustion, and a bit more confidence when overtaking up a hill.

There’s no scheduled replacement interval for the knock sensor, but a crook one will usually show up as a Check Engine Light, stored codes like P0325, dull performance, pinging under the bonnet, or ordinary fuel economy. If any of that rings a bell, it’s worth a look.

• Location: threaded into the engine block under the intake manifold area, with a single shielded lead to the engine loom.
• Common causes of drama: cracked sensor body, damaged harness or shielding, oily/dirty connector, or someone over‑tightening it after other work.

Replacement is straightforward: disconnect the battery, unplug the connector, remove the sensor, fit the new unit with a clean mating surface (and the correct washer if specified), then torque it to the factory spec in the workshop manual — don’t overtighten, as the sensor is torque‑sensitive. Route the harness exactly as per OE so it’s not picking up false noise or chafing. After refitting, clear any codes and take it for a proper warm road test under light and heavy load.

For preventative care, keep oil and coolant leaks off the block and connectors, avoid aftermarket “hard” engine mounts that can transmit excess vibration, and run quality petrol (95 RON or better if the car tends to ping). When in doubt, use genuine or reputable OEM‑equivalent sensors — cheapies can be noisy or out of calibration, which makes the ECU pull timing when it shouldn’t.

FAQs

Where is the knock sensor on a 1997 Gran Move?
It’s screwed into the engine block beneath the intake manifold area, typically around the middle of the block. You’ll see a single, shielded wire leading to the engine harness. Access is usually from above with the intake plumbing moved aside, or from below on a hoist.

Can a knock sensor be cleaned, or does it need replacing?
The sensor itself isn’t serviceable. You can clean the connector and check the wiring and shielding, but if the body is cracked or it’s out of spec in diagnostics, replacement is the go. Always refit with the correct torque.

What torque should the knock sensor be tightened to?
Use a torque wrench and follow the Gran Move/Pyzar workshop manual spec for the HD‑E/HD‑EP engine. The sensor’s calibration depends on correct clamping force, so over‑ or under‑tightening can cause false readings.