P0068,p1026,p1023,p053f codes panarama 2011 3.6

[robert johnstone]

Already replaced high pressure pump an high pressure sensor low pressure is stable at 80 psi at idle high pressure is at 780 psi at idle , did fuel volume test got 4 liters an in 1 minute .any ideas .

[robert johnstone]

I also get reduce power after a bout 1 minute of run time I can see high pressure shut down just before reduced power mode kicks in i am using a Snap-on versus pro an a autel  scanner .

[robert johnstone]

No one has any ideas .

[liam261622]

good morning. i have same codes with my 2010 paramera. what did you find to fix this? thanks

[Loren]

P0068 Mass air flow implausible

Totals fault
One or more additional faults are entered that more precisely indicate the operating ranges in which the fault occurred.

• Near idle speed range:
• P1069 + P1070 + P1071 + P1072 + P1073

• Lower partial load range :
• P1074 + P1075

• Upper partial load range :
•  P1076 + P1077

P1023 Fuel pressure/quantity too low at start

Possible fault causes

• Short term failure of the engine speed signal as a result of a crankshaft sensor fault with or without a corresponding fault entry
• Predelivery quantity or pressure in the fuel low pressure circuit too low
• Quantity control valve faulty (in fuel high pressure pump)
• Fuel high pressure pump faulty

P1026 Fuel high pressure implausible

Possible fault causes (see Fault setting condition(s))

• Below limit value:
• Predelivery quantity or pressure in the fuel low pressure circuit too low
• Fuel tank (driven) empty
• See extended fault memory
• Actual value 40 Fuel Level Input [0%]

• Below limit value or above limit value :
• Quantity control valve faulty (in fuel high pressure pump)
• Fuel high pressure pump faulty
• Insufficient fuel due to foreign bodies (chips) ahead of the fuel high pressure rail 

P053f Fuel high pressure after cold start

Possible fault causes

• Predelivery quantity or pressure in the fuel low pressure  circuit too low
• Quantity control valve faulty (in fuel high pressure pump)
• Fuel high pressure pump faulty
• Insufficient fuel due to foreign bodies (chips) ahead of the fuel high pressure rail

Based on what I see for faults here I would investigate - the fuel pump pressure and flow rate.