Nissan GT-R (R35) · Service Manual ENGINE

P1220 FUEL PUMP CONTROL MODULE (FPCM)

VR38

P1220

Description


When driving conditions demand a decrease in fuel supply, the fuel pump control module (FPCM) reduces the supply voltage to the fuel pump. When driving conditions demand an increase in fuel supply (during engine start, low engine coolant temperature or high load), the supply voltage to the fuel pump is increased.

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DTC Logic

 
 DTC DETECTION LOGIC

DTC No.
 		Trouble diagnosis name
 		DTC detecting condition
 		Possible cause
P1220
 		Fuel pump control module (FPCM)
 		During engine cranking, the signal voltage of the FPCM to the ECM is too low.
  • Harness or connectors
    (FPCM circuit is open or shorted)
    (Fuel pump circuit is open or shorted)
  • FPCM

 
 DTC CONFIRMATION PROCEDURE

 
 1.PRECONDITIONING
 
 2.PERFORM DTC CONFIRMATION PROCEDURE

Diagnosis Procedure


 
 1.CHECK GROUND CONNECTION
 
 2.CHECK FPCM POWER SUPPLY CIRCUIT
 
 3.DETECT MALFUNCTIONING PART
 
 4.CHECK FPCM GROUND CIRCUIT FOR OPEN AND SHORT
 
 5.CHECK FPCM INPUT CIRCUIT FOR OPEN AND SHORT
 
 6.DETECT MALFUNCTIONING PART
 
 7.CHECK FPCM OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
 
 8.CHECK FPCM
 
 9.CHECK INTERMITTENT INCIDENT

Component Inspection


 
 1.CHECK FUEL PUMP CONTROL MODULE (FPCM)