Piston Cooling Pressure Sensor (Code 6.8, PPID 8/SPN 520192)
Cause Reaction Remedy
• Shorted to plus (+) or minus
(-)
• Break
• None • Check that the piston cooling
pressure sensor contact is
correctly installed
•
Check that the cable harness
to the piston cooling pressure
sensor has not been dam-
aged
• Check the piston cooling
pressure sensor functionality
TAD1650GE, TAD1651GE
Internal EGR (Code 8.5, PPID 19/SPN 2791)
Cause Reaction Remedy
• Fault in cable harness (boost
pressure sensor)
• Mechanical fault on the IEGR
• Engine control module
reduces engine power
• Check cable harness (boost
pressure sensor)
•
Check the IEGR
• Contact a Volvo Penta
authorized workshop
TAD1650GE, TAD1651GE, TWD1643GE
ECU Temperature (Code 8.4, PPID 55/SPN 1136)
Cause Reaction Remedy
• Control unit too hot, incorrect
assembly
• Electrical fault, damaged sen-
sor
• None • Check the control unit instal-
lation. Recommended ambi-
ent temperature is 50°C
(122°F)
Speed Potentiometer Connected to CIU (Code 2.8, PPID 132/SPN 91, 608)
Cause Reaction Remedy
• Shorted to plus (+) or minus
(-)
• Fault in sensor
• Engine goes to idle
• Speed feezes
• Check that the potentiometer
has been connected correctly
• Check that the cable harness
to the potentiometer has not
been damaged
• Check the potentiometer
function
Injector, Cylinder #1 (Code 7.1, SID 1/SPN 651)
Cause Reaction Remedy
• Electrical fault
• Faulty compression or injec-
tor
• Engine runs on 5 cylinders
• Abnormal sound
•
Reduced performance
• Check that the injector cables
are not damaged
• Check that the injector con-
nections are not damaged
• Check fuel supply pressure
• Check the valve clearance
• Do a compression test and
check cylinder #1
Fault Code Register
7748681 12-2011 43
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