TOYOTA ENGINE CODES EXPLAINED

Written by gary on January 6th, 2010
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Have you seen those Toyota engine codes or been asked what engine code a motor was? Have you ever wondered exactly what the jumble of letters and numbers meant?TOYOTA ENGINE

First of all, one needs to realize that Toyota, like GM, Ford, etc., has engine “families”. However, rather than calling them names such as “big block” or “small block,” Toyota assigns them a letter code. The engine family code is the first letter (not the first numeral).

The first letter or letters in the code represent the engine family, for example, 1JZ-GTE & 2JZ-GTE are both JZ motors. 4A-GE, 4A-GZE, 7A-FE are all A series.

The numbers that come before these engine family letters designates the version of that engine, starting with 1 & going up to as much as 22. The higher the number the newer the version.
Often the higher the number the larger the capacity, but this is not always the case. Eg, 1UZ-FE, the first of the UZ V8s, is 4L & uses an alloy block. 2UZ-FE, the second UZ, & is 4.7L & uses an iron block. 3UZ-FE, the 3rd UZ, but is 4.3L & again uses an alloy block.

The letters that come after the dash is mostly concerned with the head & intake system used, & is quite varied. The basics are:
G= wide angle sporty twin cam head,
F= narrow angle economy twin cam head,
T= turbocharged, twin or single, no differentiation between the two, as opposed to Nissans RB25-DET & RB26-DETT,
Z= supercharged,
E= electronic fuel injection,
S= direct injection,
i= single point fuel injection (pretty much obselete these days),
C=Californian pollution control (didn’t only come out in California),
U= Japanese pollution control.

There are a number of other codes, but most of them are only applicable to much earlier engines. If there’s no codes and no dash, Eg, 18R, you can be pretty sure the motor has a single carb & single cam.

So from all this info, you can deduce that a a 1JZ-GTE is the first of the JZ series, has a twin cam head, is turbo charged and is electronically fuel injected. Whereas a 1JZ-FE has the same bottom end but a narrow valve angle twin cam head, no turbo & electronically fuel injected.

Some of the Family block types are:
JZ- inline 6
A- inline 4
G- inline 6
UZ- V8
MZ- V6
GZ- V12
FZ- inline 6
VZ- V6
S- inline 4
R- inline 4                                                                                                                                                                                                                                                                                                                  

GR-V6

AZ-2.4L. 4

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