Parts for your 1999 Toyota Crown-Camshaft sensor

1999 Toyota Crown camshaft sensor: what it does and how to look after it

Yes, the 1999 Toyota Crown uses a camshaft position sensor. Technical references that confirm fitment include the Toyota Crown S170 Series Electrical Wiring Diagram (EWD), the Toyota 1JZ-GE/2JZ-GE Engine Repair Manual (which labels the camshaft angle “G” signal), and Toyota diagnostic literature listing DTCs such as P0340 and P0341 for the camshaft position sensor circuit. These sources show the sensor mounted on the cylinder head and used by the ECU for timing and VVT-i control on the 1JZ‑GE, 2JZ‑GE and 1G‑FE engines common to the S170 Crown lineup released in 1999.

On this Crown, the camshaft sensor tells the ECU exactly where the cam is in its rotation so it can fire the coils and injectors in the right order, sync with the crank signal, and manage VVT‑i cam phasing. It’s crucial for crisp starting, smooth idle, decent fuel economy, and emissions. When it’s crook or its wiring’s dodgy, the car can be hard to start, stumble at idle, hesitate under load, or throw the check engine light.

• Common signs: long crank/no start, rough idle, random misfire feel, poor fuel use, and codes like P0340/P0341.
• Typical location: front of the cylinder head near the timing belt area, harness runs to the engine loom under the bonnet.

There’s no scheduled service interval for the cam sensor itself, but it’s worth a look during routine servicing. Keep the connector clean and latched, check the loom for brittle insulation or oil soak, and fix any rocker cover leaks that can wick oil into the plug. If the engine has been apart, make sure the sensor isn’t spaced off by stray gasket goo or a pinched O‑ring.

Replacement is straightforward for most variants:

• Disconnect the battery, unplug the sensor, remove the retaining bolt, and pull the sensor straight out.
• Lightly oil a new O‑ring, seat the new sensor, and snug the bolt to about 9–10 N·m.
• Route the harness away from hot or moving bits, clear any codes, and verify cam/crank sync and VVT‑i operation on a scan tool.

Use a quality OEM-equivalent sensor, cheapies can give flaky signals when hot. A competent home mechanic can usually do the job in under an hour. If the Crown still cranks long or sets cam/crank correlation faults after replacement, check timing belt alignment and the crank sensor, as they work as a pair.

FAQs

Where is the camshaft sensor on a 1999 Toyota Crown?
It’s typically mounted at the front of the cylinder head near the timing belt cover. On the S170’s inline-six engines, look around the cam gear area under the plastic covers. The plug and short harness run across the top front of the engine to the main loom.

Access is usually under the bonnet from above. Removing the upper plastic engine and belt covers can make the job tidier.

What fault codes point to a bad camshaft sensor on a 1999 Crown?
Common Toyota OBD‑II codes are P0340 (Camshaft Position Sensor Circuit) and P0341 (Range/Performance). If these appear with hard starting or stalling, test the sensor and its wiring before condemning the ECU.

Can a failing camshaft sensor damage the engine?
It won’t usually harm the engine mechanically, but it can cause no‑start, misfires, poor fuel economy, and limp behaviour. Driving with intermittent sync can be unsafe in traffic, so it’s best sorted promptly to keep the Crown running sweet as.