Parts for your 1999 Toyota Hilux surf-Camshaft sensor

1999 Toyota Hilux Surf camshaft sensor — what’s fitted and what to service

Short answer: it depends on the engine. On 1999 Hilux Surf petrol variants (3RZ‑FE 2.7L and 5VZ‑FE 3.4L), a camshaft position sensor is fitted and used by the ECU for sequential fuel injection and spark timing. On the 1999 1KZ‑TE 3.0L turbo‑diesel, there isn’t a separate camshaft sensor on the cylinder head. This split is shown in Toyota’s factory literature: the 5VZ‑FE and 3RZ‑FE Repair Manuals (Engine Control — SFI System) list a camshaft position sensor (G signal), while the 1KZ‑TE EFI Diesel manuals and Electrical Wiring Diagrams show NE and G sensors located within the injection pump providing engine speed and TDC reference, with no external cam sensor on the head.

If you’ve got a 1KZ‑TE diesel, a stand‑alone camshaft sensor isn’t used because the electronically controlled distributor‑type injection pump already hosts the position/sync sensors (NE and G) the ECU needs. Pair that with the crank reference and the ECU can control timing and fuelling without a separate cam signal from the head. That’s why you won’t find a cam sensor listed or pictured on the 1KZ‑TE head in Toyota’s EWD or engine control sections.

For petrol models where a camshaft sensor is fitted, here’s what matters. The cam sensor’s job is to tell the ECU exactly where the cam is in its rotation so it can fire injectors sequentially and time ignition precisely. That sharper timing helps cold starts, smooth idle, power delivery, and emissions. When the sensor or its wiring plays up, you can see hard starting, intermittent stalling, rough running, poor economy, or a check‑engine light with codes like P0340/P0341.

There’s no fixed replacement interval for the cam sensor itself, but it’s smart to inspect it whenever the front covers are off (for example, during timing belt service on the V6) or during scheduled servicing. Practical tips:

• Check the connector for oil ingress, brittle insulation, or green corrosion. Clean carefully and reseat the plug.
• Inspect the harness where it passes close to hot or moving parts, repair any rubbed or hardened sections.
• If replacing, go for quality OEM‑equivalent parts. The sensor is non‑adjustable, ensure it seats fully and the O‑ring (if fitted) is fresh to prevent oil leaks.
• Clear fault codes, then road‑test and confirm live‑data shows stable cam sync.

On the Hilux Surf petrol engines, the sensor is mounted on the cylinder head and reads a trigger on the cam. A light oil film is normal, but heavy contamination suggests a leaking seal—sort that or the issue will come back. With a healthy cam sensor, the ECU keeps timing bang on, which drivers notice as reliable starts and a clean, consistent pull through the revs.

If you’re unsure which engine you’ve got, check the build plate or the engine stamp: 3RZ‑FE and 5VZ‑FE use a cam sensor, 1KZ‑TE diesel does not have a separate one on the head.

• Does a 1999 Hilux Surf 1KZ‑TE have a camshaft sensor?
  Not as a separate sensor on the cylinder head. Toyota’s EFI Diesel system for the 1KZ‑TE uses NE and G signals from within the injection pump (plus crank reference) to provide speed and TDC/cylinder identification, so a head‑mounted cam sensor isn’t required.
• Where’s the camshaft sensor on a 5VZ‑FE Hilux Surf?
  On the cylinder head, reading a tooth/trigger on the cam. Access varies with covers and accessories in place, it’s typically reached from the top with basic hand tools.
• What fault codes point to a cam sensor issue on the petrol models?
  P0340 and P0341 are the common ones. You may also see misfire or no‑start complaints. Always inspect wiring and connectors before condemning the sensor.