31 Rev-5 Dec 2, 2019
DTC List – Continued
DTC
Fault Description
MIL
Flash
Code
741
Pre-catalyst O2 sensor inactive on Gas 1, may be due to open O2 sensor
signal or heater leads, defective O2 sensor
741
743
Post-catalyst fuel control on Gas 1 has sensed the O2 sensor is changing
too frequently and too much. Normally, the sensor voltage should be
steady. Possible causes for this fault are a faulty sensor, air leak in
exhaust sytem or failed catalyst
743
744
Post-catalyst fuel control on Gas 2 has sensed the O2 sensor is changing
too frequently and too much. Normally, the sensor voltage should be
steady. Possible causes for this fault are a faulty sensor, air leak in
exhaust sytem or failed catalyst
744
745
Pre-catalyst O2 sensor inactive on Gas 2, may be due to open O2 sensor
signal or heater leads, defective O2 sensor
745
751
Pre-catalyst O2 sensor indicates extended lean operation on Gas 1
751
752
Post-catalyst O2 sensor control has reached rich limit on Gas 1 and
sensor still reads too lean. This could be caused by an exhaust leak,
catalyst failure, sensor failure, or wiring/relay failure causing the sensor to
not be properly heated. If any Pre-O2
752
753
Post-catalyst O2 sensor control has reached rich limit on Gas 2 and
sensor still reads too lean. This could be caused by an exhaust leak,
catalyst failure, sensor failure, or wiring/relay failure causing the sensor to
not be properly heated. If any Pre-O2
753
761
Pre-catalyst O2 sensor indicates extended lean operation on Gas 2
761
762
Post-catalyst O2 sensor control has reached lean limit on Gas 1 and
sensor still reads too rich. This could be caused by catalyst failure,
sensor failure, or wiring/relay failure causing the sensor to not be properly
heated. If any Pre-O2 sensor faults exist, diagnose and repair them first,
then check and see if this fault resets.
762
763
Post-catalyst O2 sensor control has reached lean limit on Gas 2 and
sensor still reads too rich. This could be caused by catalyst failure,
sensor failure, or wiring/relay failure causing the sensor to not be properly
heated. If any Pre-O2 sensor faults exist, diagnose and repair them first,
then check and see if this fault resets.
763
764
Post-catalyst O2 sensor signal out of range due to disconnected sensor
or open circuit
764
771
Pre-catalyst O2 sensor indicates extended rich operation on Gas 1
771
781
Pre-catalyst O2 sensor indicates extended rich operation on Gas 2
781
791
Rotary Fuel Trim Valve 1 Fault, signal has opened or shorted to ground or
power or defective Rotary Fuel Trim Valve
791
792
Rotary Fuel Trim Valve 2 Fault, signal has opened or shorted to ground or
power or defective Rotary Fuel Trim Valve
792
811
Engine knock multiplier above amplitude defined for Level1 derate
811
812
Engine knock multiplier above amplitude defined for Level2 derate
812
Summary of Contents for NA428
Page 2: ...202890 Rev 5 Dec 2 2019...
Page 6: ...3 Rev 5 Dec 2 2019 Spare Page...
Page 47: ...44 Rev 5 Dec 2 2019 Notes...
Page 48: ......
