Parts for your 2006 Toyota Mark x-Crank angle sensor

2006 Toyota Mark X crank angle sensor — what it does and when to service it

Yes, the 2006 Toyota Mark X is fitted with a crank angle sensor (Toyota typically calls it the crankshaft position sensor, CKP). Technical sources including the Toyota Mark X GRX12# Repair Manual — SFI System for the 3GR‑FSE and 4GR‑FSE engines, the Toyota Electrical Wiring Diagram, and the Toyota Electronic Parts Catalogue list and diagram this sensor, along with related OBD‑II diagnostics such as DTC P0335/P0336 for the CKP circuit. On these GR‑series V6s, the CKP provides the ECM with the NE signal for precise engine control.

The sensor’s job is simple but critical: it tracks crankshaft position and speed so the ECM can fire the spark and inject fuel at the right moment, and coordinate Dual VVT‑i cam timing and the direct‑injection strategy. If it goes on the fritz, the engine may crank but not start, cut out unexpectedly, or run rough as the timing guesses go out the window.

For servicing, the crank angle sensor isn’t a routine replacement item, but it’s worth inspecting during major services. Check the wiring and connector for heat damage or oil ingress, and make sure there’s no weeping from the sensor’s O‑ring into the plug. If the car throws a P0335/P0336, won’t start hot, or the tacho drops out while driving, it’s time to test the sensor and its circuit. A scan tool should show a steady engine speed signal while cranking, an oscilloscope will confirm a clean square‑wave signal. On the GR engines the sensor is mounted low on the block near the bellhousing, so access is typically from underneath with the vehicle safely supported.

Replacement is straightforward for a competent home mechanic: disconnect the battery, unplug the sensor, remove the single retaining bolt, and ease the sensor out. Lightly oil the new O‑ring, seat the new sensor, and torque the bolt to the workshop manual spec. Clear any codes and let the ECM relearn idle. No special programming is normally required on these models. Preventative care is mostly about keeping oil leaks in check, ensuring the harness stays clipped away from hot exhaust sections, and avoiding water blasting the connector area.

• Typical symptoms: long crank/no start, sudden stall, uneven idle, poor fuel economy, check engine light with P0335/P0336.
• Good practice: use a quality OEM‑equivalent sensor, replace the O‑ring, and verify live data after fitting.

Popular questions about the 2006 Toyota Mark X crank angle sensor

Where is the crank angle sensor on a 2006 Toyota Mark X?
On the GR‑series V6 (3GR‑FSE/4GR‑FSE), it’s mounted low on the engine block near the transmission bellhousing, generally on the right‑hand side when viewed from the driver’s seat. It’s usually accessed from underneath with the splash shield removed.

What are the signs the crank angle sensor is failing?
Common clues include hard starting when hot, random stalling, a dead tacho during cranking, rough running, and a check engine light with codes like P0335 or P0336. Fuel economy can dip as the ECM falls back to a safe strategy.

Do I need to program anything after replacing it?
No special coding is normally needed on the 2006 Mark X. After installation, clear fault codes, start the engine, and let it idle to stabilise. A short drive cycle helps the ECM refine its trims and VVT control.