Part 1

Scan Tool Data Definitions

The Engine Control Module Scan Tool Data Definitions contains a brief description of all engine control module (ECM) related parameters available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists. In some cases, the parameter may appear more than once or in more than one data list in order to group certain related parameters together.
5 Volt Reference 1 Circuit
- This parameter displays the voltage sensed on the 5-volt reference 1 circuit at the control module. The scan tool will display a higher value at higher voltage. The scan tool will display a lower value at lower voltage.

5 Volt Reference 2 Circuit
- This parameter displays the voltage sensed on the 5-volt reference 2 circuit at the control module. The scan tool will display a higher value at higher voltage. The scan tool will display a lower value at lower voltage.

5 Volt Reference 3 Circuit
- This parameter displays the voltage sensed on the 5-volt reference 3 circuit at the control module. The scan tool will display a higher value at higher voltage. The scan tool will display a lower value at lower voltage.

A/C Relay Command
- This parameter displays the commanded state of the air conditioning (A/C) clutch relay control circuit. The scan tool will display ON or OFF. ON indicates the A/C clutch relay control circuit is being grounded by the control module, allowing voltage to the A/C compressor clutch. OFF indicates the A/C clutch relay is not being commanded on by the control module.

Ambient Air Temperature
- This parameter displays the temperature of the ambient air as calculated by the control module based on the input from the ambient air temperature sensor. The scan tool will display a low value when the air temperature is low, and a high value when the air temperature is high.

APP Indicated Angle
- This parameter displays the angle of the accelerator pedal as calculated by the control module using the signals from the accelerator pedal position sensors. The accelerator pedal position (APP) indicated angle is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed.

APP Sensor 1
- This parameter displays the voltage signal sent to the control module from APP sensor 1 of the APP sensor assembly. APP sensor 1 is a range of values indicating a low voltage when the accelerator pedal is not depressed to a high voltage when the accelerator pedal is fully depressed.

APP Sensor 1
- This parameter displays the angle of the accelerator pedal position (APP) sensor 1 as calculated by the control module using the signal from the APP sensor 1. APP sensor 1 is a range of values indicating a low percentage.

APP Sensor 1 Indicated Position
- This parameter display the angle of the APP sensor 1 as calculated by the control module using the signal from the APP sensor 1. APP sensor 1 is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed.

APP Sensor 2
- This parameter displays the voltage signal sent to the control module from APP sensor 2 of the APP sensor assembly. APP sensor 2 is a range of values indicating a low voltage when the accelerator pedal is not depressed to a high voltage when the accelerator pedal is fully depressed.

APP Sensor 2
- This parameter displays the angle of the accelerator pedal position (APP) sensor 2 as calculated by the control module using the signal from the APP sensor 2. APP sensor 2 is a range of values indicating a low percentage.

APP Sensor 2 Indicated Position
- This parameter displays the angle of the APP sensor 2 as calculated by the control module using the signal from the APP sensor 2. APP sensor 2 is a range of values indicating a low percentage when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed.

Balancing Rate Cyl. 1-8
- These parameter display the adjustment in fuel volume for each cylinder as calculated by the control module. The scan tool will display a negative balancing rate if the fuel volume is lowered. The scan tool will display a positive balancing rate if the fuel volume is increased.

BARO
- This parameter displays the barometric pressure as calculated by the control module using the signal from the barometric pressure (BARO) sensor. The scan tool will display a high value at higher barometric pressures, such as sea level. The scan tool will display a lower value at lower barometric pressures, such as higher altitude locations.

Base Injector Fuel Rate
- It display base calculate rate fuel delivers. The rate is calculated in cubic millimeters.

CAM Signal Present
- This parameter displays the state of the CAM signal as determined by the control module. The scan tool will display Yes if the CAM signal is being received by the control module. The scan tool will display No if the CAM signal is missing.

CKP Sensor Signal Present
- This parameter displays an incrementing counter when the control module receives a signal from the crankshaft position (CKP) sensor. The scan tool will display an incrementing counter when the CKP signal is being received by the control module. The scan tool will display a steady number when the CKP signal is not being received by the control module.

Cmmd. A/F Equivalence Ratio
- This parameter displays the ratio of air to fuel as calculated by the control module based on various sensor inputs. The scan tool will display a lower air fuel ratio when a richer air to fuel mixture is commanded. The scan tool will display a higher air fuel ratio when a leaner air to fuel mixture is commanded.

Coolant Level Switch
- This parameter displays the level of engine coolant as determined by the control module. The control module determines the level of the coolant using the signal from a switch used to monitor the engine coolant level. The scan tool will display low when the engine coolant level is low. The scan tool will display OK when the coolant level is correct.

Cruise Control Active
- This parameter displays the status of the cruise control system as determined by the control module. The scan tool will display Yes when the cruise control system is in control of vehicle speed. The scan tool will display No when the cruise control system is not operating.

Current Fuel Type
- The parameter will display diesel as the current fuel type.

Desired EGR Position
- This parameter displays the position of the exhaust gas recirculation (EGR) valve commanded by the control module. The scan tool will display 0 percent when the control module is commanding the EGR valve closed. The scan tool will display a higher percentage when the EGR valve is commanded open.

Desired Fuel Rail Pressure
- This parameter displays the desired fuel rail pressure as calculated by the control module. This value is calculated based on engine speed, engine load, and sensor inputs. The scan tool will display a higher value at higher engine speeds and loads, and a lower value at idle.

Desired IAF Valve Position
- This parameter will display the position of the intake air flow valve and it will display it in percentage.

Desired Idle Speed
- This parameter displays the engine idle speed in RPM as commanded by the control module. The control module compensates for various engine loads in order to maintain the desired engine speed at idle. This parameter is not valid unless the engine is running.

Desired TC Vane Position
- This parameter displays the position of the turbocharger vane position sensor as the turbocharger vane position is commanded by the control module. The scan tool will display 0 percent when the control module is commanding the vanes open. The scan tool will display a higher percentage when the vanes are commanded closed.

Des. TC Vane Pos. Ctrl. Solenoid
- This parameter displays the desired current draw of the turbocharger vane position control solenoid valve as calculated by the control module. The scan tool will display a high value if the solenoid is commanded open, and a lower value when the solenoid is commanded closed.

Distance Since DTC Cleared
- This parameter will display the amount of vehicle travel after a DTC has been cleared. This parameter will be displayed in km/miles.

Distance Since Last DPF Regeneration
- This parameter will display the amount of vehicle travel after a DPF regeneration. This parameter will be displayed in km/miles.

DPF Indicator Command
- This parameter will display the status of the IPC mounted DPF status light. This parameter will display On/Off.

DPF Pressure Sensor
- This parameter will display the voltage differential between the front and rear pressures at the DPF as calculated by the ECM. This will be displayed in volts. As the DPF becomes restricted the differential pressure increases and the voltage we get higher.

DPF Regen Inhibit Reason
- The parameter will display the reason why the DPF regeneration was inhibited. The parameter will display, None; Engine Run Time; ECT Too Low Eng. Oil temp; BARO Low; ECT Too High; Ign. Voltage; Not in Park; Trans. Range; VSS Engine Speed; Fuel Rate APP; EGT 1 Range; EGT 2 Range; Soot Mass; Fault; DPF Temperature; EGT 1 High; EGT 2 High ; Fault; Device Control; ECT too High; Decel Rate; Fuel Level Low; Turbo Temp; TCM; Idle Speed; MEC Counter; BPP Applied.

DPF Regeneration Reason
- This parameter will display the reason for the regen. The parameter will display, None; Fuel Used; Engine Run Time; Distance Traveled; Device Control; DPF Pressure; Soot Mass, Calc. Soot.

DPF Regeneration Status
- This parameter will display the status of the regen. The parameter will display, Not Required; Regen Required; Regen Active; Device Control; Regen Complete.

DPF Soot Mass
- This parameter displays the amount of calculated soot in exhaust particulate filter. This parameter will be displayed in grams.

EC Ignition Relay Command
- This parameter displays the commanded state of the engine control (EC) ignition relay control circuit. The scan tool will display ON or OFF. ON indicates the EC ignition relay control circuit is being grounded by the control module, allowing voltage to other control module circuits and systems. OFF indicates the EC ignition relay is not being commanded ON by the control module.

ECT Sensor 1
- This parameter displays the temperature of the engine coolant calculated by the control module, based on the input from the engine coolant temperature sensor. When the coolant temperature is low, the scan tool will display a low temperature. When the coolant temperature is high, the scan tool will display a high temperature.

ECT Sensor 2
- This parameter displays the temperature of the engine coolant based on the input from the engine coolant temperature (ECT) sensor 2. When the coolant temperature is low, the scan tool will display a low temperature. When the coolant temperature is high, the scan tool will display a high temperature.

EGR Learn Minimum Position
- This parameter will display the learned value of the EGR valve. This parameter will be displayed in a percentage.

EGR Position Sensor
- This parameter displays the voltage signal received from the EGR valve position sensor by the control module. The scan tool will display a lower value when the EGR valve is closed, and a higher value when the EGR valve is open.

EGR Position Sensor
- This parameter displays EGR valve position as calculated by the control module based on an input from the EGR valve position sensor. The scan tool will display a lower value when the EGR valve is closed, and a higher value when the EGR valve is open.

EGR Position Variance
- This parameter displays the difference between the desired EGR valve position calculated by the control module and the actual EGR position input from the EGR valve position sensor. The scan tool will display a higher value if the difference is large, and a lower value if the difference is small.

EGR Solenoid Command
- This parameter displays the duty cycle commanded by the control module for the EGR valve. The scan tool will display a high percentage when the EGR valve is commanded open. The scan tool will display a low percentage when the EGR valve is commanded closed.

EGT Sensor 1
- This parameter will display the exhaust temperature before the DPF. When the exhaust temperature is low, the scan tool will display a low temperature. When the exhaust temperature is high, the scan tool will display a high temperature.

EGT Sensor 2
- This parameter will display the exhaust temperature after the DPF. When the exhaust temperature is low, the scan tool will display a low temperature. When the exhaust temperature is high, the scan tool will display a high temperature.

Engine Load
- This parameter displays the engine load in percent based on inputs to the control module from the various engine sensors. The scan tool will display a low percentage when the engine is at idle with little or no load. The scan tool will display a high percentage when the engine is running at a high RPM under a heavy load.

Engine Oil Life Remaining
- This parameter displays the amount engine oil life remaining before requiring an oil change based on calculations by the control module. The scan tool will display lower values as the engine oil life approaches 0 miles.

Engine Oil Pressure Sensor
- This parameter displays the pressure of the engine oil as calculated by the control module using a signal from the engine oil pressure (EOP) sensor. The scan tool will display oil pressure when the engine is running. The engine oil pressure sensor has a range of values indicating a low value when the oil pressure is low to a high value when the oil pressure is high.

Engine Run Time
- This parameter displays the time elapsed since the engine was started. The scan tool will display the time in hours, minutes and seconds. The engine run time will reset to zero when the engine stops running.

Engine Run Time Since Last DPF Regeneration
- This parameter displays the total of time since the last regen. This parameter will be displayed in hours, minutes and seconds.

Engine Speed
- This parameter displays the speed of the crankshaft as determined by the control module using an input from the CKP sensor. The scan tool will display a high value at high engine speeds and a low value at low engine speeds.

FRP Regulator Command
- This parameter displays the fuel rail pressure regulator duty cycle as commanded by the control module. The scan tool will display a lower value for a higher commanded fuel pressure, and a higher value for a lower commanded fuel pressure.

Fuel Level Sensor
- This parameter displays the approximate fuel level in the fuel tank as calculated by the control module based on inputs from the fuel level sensors. The scan tool will display a low value when the fuel level in the tank is low or near empty. The scan tool will display a high value when the fuel level in the tank is high or near full.