The firing order for the 2002 Lexus IS300 is 1-5-3-6-2-4 on its 3.0-liter inline-6 2JZ-GE engine.
The IS300 from that year uses Toyota's 2JZ-GE engine, a six-cylinder inline configuration. Understanding the firing order helps with spark plug wiring, timing belt/chain work, and ignition-related maintenance. This article explains the order, how cylinders are numbered, and where to find the information in service references.
Engine and cylinder numbering
Before listing the firing order, it's helpful to know how the cylinders are numbered on the IS300's engine. In a typical inline-6 like the 2JZ-GE, the cylinders are numbered from the front of the engine to the rear as 1 through 6. The ignition sequence given below corresponds to that numbering.
Firing order for the 2JZ-GE inline-6
To reference the ignition sequence correctly, note the following order. The list maps the order to cylinder numbers.
The sequence is:
- 1 — fires first
- 5 — fires second
- 3 — fires third
- 6 — fires fourth
- 2 — fires fifth
- 4 — fires sixth
The above sequence is the standard firing order used by the 2JZ-GE in the IS300, and it should be used when wiring spark plugs or diagnosing ignition timing. Always verify with the factory service manual for your vehicle's VIN and production date.
Practical tips for maintenance and verification
Before performing timing-related work, consult the official service manual and use timing marks on the camshaft pulleys and crankshaft pulley to verify alignment. If you're uncertain, seek professional assistance to avoid engine damage.
Summary
The 2002 Lexus IS300 uses the 2JZ-GE inline-6 engine, and its firing order is 1-5-3-6-2-4. Cylinder numbering runs from front to rear (1 through 6), and this sequence is essential for correct ignition timing. Always check the latest service documentation when performing maintenance.