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11.
Engine Diagnostics and Codes
Name
Description
Trouble MIL
Buzzer Reduce Comments
Code
Lamp
RPM
Oil Temperature Warning
Sensor alerts ECM if engine oil temperature is above 300° F.
175
X
X
Reduces RPM to 2500. Not used on 5.7 Engines.
Oxy Fuel Trim
ECM sets code after detecting abnormally rich or lean condition.
65565-66
X
65 indicates odd bank, 66 even bank.
Oxy Heater
ECM sets code after detecting failure in O2 sensor heaters.
66019-22
X
19 = pre-o2 odd bank, 20 = pre-o2 even bank, 21 = post-o2 odd
bank, 22 = post-o2 even bank.
Oxy Response
ECM sets code after determining O2 sensor response is slow.
65567-68
X
67 indicates odd bank, 68 even bank.
Oxy Voltage
ECM sets code after detecting abnormal voltage at O2 sensors.
65561-64
X
61 = pre-o2 odd bank, 62 = post-o2 odd bank, 63 = pre-o2 even
bank, 64 = post-o2 even bank.
Powertrain Relay
ECM detects abnormal relay contact voltage.
66013-14
X
Supercharger Inlet Pressure Sensor
Supercharger inlet pressure too high or too low.
3563
X
Only applicable on supercharged engines.
Shift Interrupt
66026
Slow Mode Lamp
66010
Speed Based Output
66011
Speed Sensor
ECM sets code if speed sensor fails diagnostic test.
84
X
Not normally used in jet or repower applications. Used in
Towboat
applications.
Starter Relay Driver
66002
SVS Lamp
ECM detects issue with SVS circuit.
66004
X
This circuit controls the warning buzzer alarm.
System Voltage
ECM sets code if system voltage is below 10 or above 16.
627
X
Check alternator connections and for tight belt. May need
replacement.
Tachometer
66018
Tiap Sensor
3562
5V Buffer
ECM detects out of range voltage on low voltage output pins.
65620-23
X
Used to supply voltage to engine sensors. It is a 5 volt reference.
Var Gov
65690
