Toyota 1 MZ–FE Manual page 506

EG2–506
Check for open and short in harness and connector between ECM
and crankshaft position sensor (See page IN–31).
Inspect sensor installation and teeth of signal plate.
Check and replace ECM (See page IN–36).
1MZ–FE ENGINE – CIRCUIT INSPECTION
Repair or replace harness or connector.
Tighten the sensor.
Replace signal plate.