Check signal waveform of injector and Rail pressure regulator.
Ignition "ON" & Engine "ON".
Ignition "OFF".
Monitor signal waveform of the injector and rail pressure regulator on the Scantool.
Specification :
The injectors should not be controlled by ECM when IG Key Off.
Does injector operate even though ignition is OFF ?
YES
▶ Perform Injectors & Rail Pressure regulator Inspection procedure. For more detail information, refer to DTC P0261 to P0272 for Injectors. Repair or replace as necessary and Substitute with a known-good ECM and check for proper operation. If the problem is corrected, replace ECM and then go to "Verification of Vehicle Repair" procedure.
NO
▶ Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification vehicle Repair" procedure.
