FUEL INJECTION SYSTEM
8-14
Fault code 12
Symptom
Crankshaft position sensor: no normal signals are received
from the crankshaft position sensor.
Fail-safe system Unable to start engine
Unable to drive vehicle
Diagnostic code No. —
Diagnostic tool display —
Procedure —
Or-
der
Probable cause of malfunc-
tion and check
Maintenance job Reinstatement method
1 Connection of crankshaft po-
sition sensor coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).
Improperly connected
Connect the coupler secure-
ly, or repair/replace the wire
harness.
Crank the engine.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
2 Connection of wire harness
ECU coupler.
Check the locking condition
of the coupler.
Disconnect the coupler, and
check the pins (for bent or
broken terminals and locking
condition of the pins).
Improperly connected
Connect the coupler secure-
ly, or repair/replace the wire
harness.
Crank the engine.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
3 Wire harness continuity. Open or short circuit Re-
place the wire harness.
Between the crankshaft posi-
tion sensor coupler and ECU
coupler.
gray–gray
black/blue–black/blue
Crank the engine.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
4 Mounted condition of crank-
shaft position sensor.
Check for looseness or
pinching.
Check the gap between the
crankshaft position sensor
and the pickup rotor.
Improperly mounted sensor
Remount or replace the
sensor. “AC MAGNETO” on
page 5-58.
Crank the engine.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
5 Defective crankshaft position
sensor.
Check the crankshaft position
sensor.
“CHECKING THE CRANK-
SHAFT POSITION SEN-
SOR” on page 8-42.
Crank the engine.
Fault code No. is not dis-
played Repair is finished.
Fault code No. is displayed
Go to next order.
6 Faulty ECU Replace the ECU.
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