6 - 13 FUEL INJECTION SYSTEM FI FI Fault code No. 12 Symptom No normal signals are received from the crankshaft posi- tion sensor. Diagnostic code No. — — Order Item/components and probable cause Check or maintenance job Reinstatement method 1 Installed condition of crankshaft position sensor. Check for looseness or pinching. Cranking the engine. 2 Connections • Crankshaft position sensor cou- pler • Main wire harness-ECU coupler • Check the coupler for any pins that may be pulled out. • Check the locking condition of the coupler. • If there is a malfunction, repair it and connect the coupler securely. 3 Open or short circuit in wire har- ness.
• Repair or replace if there is an open or short circuit. • Between the crankshaft position sensor coupler and ECU cou- pler. (gray–gray) (black/blue–black/blue) 4 Defective crankshaft position sen- sor. • Replace if defective. Refer to “IGNITION SYSTEM” in chapter 9.