Parts for your 2002 Toyota Crown-Camshaft sensor

2002 Toyota Crown Camshaft Sensor: what it does, where it sits, and when to replace it

Yes, the 2002 Toyota Crown is fitted with a camshaft position sensor. Toyota’s New Car Features manuals for the S170-series Crown (2001–2003), the 2002 Crown Electrical Wiring Diagram, and the Toyota Electronic Parts Catalogue for model codes such as JZS171/GS171/UZS171 all show a dedicated camshaft position sensor (CMP, often labelled “G” in Toyota literature). Engines used in 2002 Crowns — including the 1G‑FE (2.0L), 1JZ‑FSE/2JZ‑FSE (2.5L/3.0L D‑4) and the 1UZ‑FE VVT‑i (Majesta) — rely on the CMP for sequential fuel injection and VVT‑i control.

The camshaft sensor lets the ECU know exactly where the cam is relative to the crank, so it can fire injectors in the right order, time the spark cleanly, and command VVT‑i to advance or retard the cams. On the inline‑six models there’s typically one CMP at the front of the cylinder head near the cam gear. On V8 1UZ‑FE VVT‑i variants there are two (one per bank) near the front of each head. Without a solid CMP signal, the Crown may crank longer, idle roughly, lose grunt, or light the MIL with faults like P0340/P0345. The ECU can sometimes “limp” using crank-only fallback, but drivability and emissions suffer.

There’s no scheduled replacement interval for the CMP, it’s a “fit and forget” item until symptoms appear. As part of sensible servicing on a 2002 Crown, it’s worth a quick look whenever the timing belt, water pump, or rocker cover gaskets are being done. Check the sensor connector for oil intrusion, brittle wiring, or green corrosion. The O‑ring can harden and weep, a fresh O‑ring is cheap insurance against leaks under the bonnet.

Replacement is straightforward with basic spanners. Disconnect the battery, unplug the connector, remove the small retaining bolt, wiggle the sensor out, lightly oil the new O‑ring, and refit. Don’t overtighten the bolt — follow the Toyota repair manual torque spec for your engine, these fasteners are small. After installation, clear any codes and verify with a scan tool that the ECU sees both crank and cam sync. Genuine or quality Denso‑build sensors tend to give the most reliable signal, which keeps VVT‑i happy and starts crisp, especially on cold Kiwi or Aussie mornings.

• Common signs: hard starting, rough idle, flat spots, worse fuel economy, MIL on (P0340/P0345).
• Good practice: inspect wiring and O‑ring at each timing belt service, replace if contaminated or intermittent.

Technical references consulted: Toyota Crown S170 New Car Features (Engine Control/VVT‑i), 2002 Toyota Crown Electrical Wiring Diagram (CMP “G” circuit), and Toyota Electronic Parts Catalogue for JZS171/GS171/UZS171 models listing “Sensor, Cam Position”.

Popular questions about 2002 Toyota Crown camshaft sensors

Does a 2002 Toyota Crown have more than one camshaft sensor?
Inline‑six models like the 1G‑FE, 1JZ‑FSE and 2JZ‑FSE use a single camshaft sensor on the head. The 1UZ‑FE VVT‑i V8 (Crown Majesta) uses two — one on each bank — so faults may be bank‑specific (e.g., P0345 for Bank 2). Always check which engine is under your bonnet before ordering parts.

Can a dirty or oily camshaft sensor be cleaned, or should it be replaced?
If the sensor tip is lightly oily, a gentle wipe is fine, but if there’s oil inside the connector or the sensor body is cracked, replacement is the go. Address any O‑ring leaks and wiring damage at the same time. Cleaning won’t fix an internal fault or a weak signal.

Is it safe to keep driving with a P0340/P0345 on a Crown?
It might start and run using crank fallback, but it can stall, run rich and harm the cat over time. For reliable commuting and road trips across Australia or New Zealand, sort it promptly — it’s usually a quick fix that restores smooth running and proper VVT‑i operation.