July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Code 12 - Rpm Signal DIANOSIS

No signal to ECU within serveral seconds after engine is cranked (TAC).

Trouble Area:

Ignition coil circuit
Ignition coil
Ignition circuit
Igniter
ECU

Fig 1: Code 12 - RPM Signal Dianosis Schematic

G50G07212

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Code 12 - RPM Signal Dianosis Flow Chart

G50I07213

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002