I want to thank you for your detailed information on these codes. I am not the one that posted, but, have a Clark C25 that has had number of codes before and we had to replace coil, oxy sensor, FTV and paid Equipment Depot to install the latest software.
Unfortunately they then found out that the SECM has to have a resistor in it or the electrical system will trigger codes.
I'll troubleshoot my code 73 with your information.
Have a great day and thanks again.
code 31 is a "running reset" that sets the code anytime the engine stops running with the key on.. You need the software to update the SECM to the latest version.
Couldnt find anything on code 31?
Code 71
AFRTrimValveOutput
FTV modulation driver signal fault
Stored Fault Code
(MIL, Disable Adaptive
learns)
Check FTV for an open wire or FTV connector being
disconnected
FTV PIN A (SIGNAL) to PIN B (PWR)
Check FTV for an open coil by disconnecting the
FTV connector and measuring the resistance
(~26Ù +/-2Ù)
FTV PIN A (SIGNAL) to PIN B (PWR)
Code 73
AFRTrimValveUpperDC
FTV duty cycle at high (rich) limit
(Expected fault when FTV
connector is unplugged)
Stored Fault Code
(MIL, Disable Adaptive
learns)
Engine measured Air/Fuel ratio at the O2 sensor is
excessively rich
Check FTV connector wiring for an open circuit
FTV PIN 4 (SIGNAL) to PIN B (PWR)
Check FTV for an open coil by disconnecting the
FTV connector and measuring the resistance
(~26Ù +/-2Ù)
FTV PIN A (SIGNAL) to PIN B (PWR)
* Check N-CA55-500-TR mixer for heavy end
build-up and operation (see mixer section)
* Check N2001 secondary for operation (see N2001 Regulator section)
Code 74
O2SensorSwitching
O2 sensor is not switching across
the reference AFR voltage
Stored Fault Code
(MIL, Disable Adaptive
learns)
Check the FTV for proper operation
* Check FTV Hose Connections
Check FTV for an open coil by disconnecting the
FTV connector and measuring the resistance
(~26Ù +/-2Ù)
FTV PIN A (SIGNAL) to PIN B (PWR)
Does this truck have the Woodward LPG fuel system in it? What size engine is in the truck?
Does this truck have the Woodward LPG fuel system in it? What size engine is in the truck?