Circuit Inspection - Toyota 3VZ–FE Troubleshooting Manual

EG–354

CIRCUIT INSPECTION

DTC 12
CIRCUIT DESCRIPTION
The distributor in the Engine Control System contains three pick–up coils (G1, G2 and NE).
The G1, G2 signals inform the ECM of the standard crankshaft angle.
The NE signals inform the ECM of the crankshaft angle and the engine speed.
Code No. Diagnostic Trouble Code Detecting Condition
No "NE" or "G1" and "G2" signal to ECM within 2 sec.
after cranking.
12
Open in "G
Reference INSPECTION USING OSCILLOSCOPE
ENGINE TROUBLESHOOTING
RPM Signal Circuit (No. 1)
" circuit.
– CIRCUIT INSPECTION

Open or short in NE, G circuit.

Distributor

Open or short in STA circuit.
Open or short in STA circuit

ECM

During cranking or idling, check between terminals G1,
G2, NE and G
HINT: The correct waveforms appear as shown in the
illustration on the left.
Trouble Area
of ECM.