Scan Tool Data Definitions 1

SCAN TOOL DATA DEFINITIONS

The Engine Scan Tool Data Definitions contains a brief description of all engine 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.

24X Crank Sensor: This parameter displays the speed of the crankshaft as calculated from the medium resolution engine speed signal by the control module. A high RPM indicates a high engine speed. A low RPM indicates a low engine speed.

A/C Relay Circuit History: This parameter displays the diagnostic state history of the output driver for the air conditioning (A/C) clutch relay control circuit. The scan tool will display OK, Fault or Invalid State. OK indicates that no circuit faults are detected during the current test. Fault indicates that a short or open circuit/component exists, electronically disconnecting the circuit/component from the control module.

A/C Relay Circuit Status: This parameter displays the status of the output driver for the air conditioning (A/C) clutch relay control circuit. The scan tool will display OK, Fault or Invalid State. OK indicates that no circuit faults are detected during the current test. Fault indicates that a short or open circuit/component exists, electronically disconnecting the circuit/component from the control module.

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.

Air Fuel 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. In closed loop operation the air fuel ratio should normally be around 14.2-14.7 to 1.

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 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 accelerator pedal position (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 when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed.

APP Sensor 1 Circuit: This parameter displays the diagnostic state of the APP sensor 1 Circuit. The scan tool will display OK or Fault. OK indicates that no circuit faults are detected during the current test. Fault indicates that a short or open circuit/component exists.

APP Sensors 1 and 2: This parameter displays the results of a control module test that compares the signals from the accelerator pedal position (APP) sensors 1 and 2. The scan tool will display Agree or Disagree. Agree indicates that APP sensor 1 and APP sensor 2 voltages correspond to the same accelerator pedal position. Disagree indicates that APP sensor 1 and APP sensor 2 voltages correspond to different accelerator pedal positions.

APP Sensor 2: This parameter displays the voltage signal sent to the control module from accelerator pedal position (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 when the accelerator pedal is not depressed to a high percentage when the accelerator pedal is fully depressed.

APP Sensor 2 Circuit: This parameter displays the diagnostic state of the APP sensor 2 Circuit. The scan tool will display OK or Fault. OK indicates that no circuit faults are detected during the current test. Fault indicates that a short or open circuit/component exists.

BARO: This parameter displays the barometric pressure as calculated by the control module using the signal from the manifold absolute pressure (MAP) sensor measured when the ignition is turned on with the engine not running. The control module will update the barometric pressure during wide-open throttle (WOT) conditions.

Catalytic Converter Protection Active: This parameter displays the state of the Catalytic Converter Protection mode.

CMP Sensor: This parameter displays the speed of the engine as calculated by the signal from the camshaft position (CMP) sensor.

CMP Sensor Signal Present: This parameter displays when the camshaft position (CMP) signal is received by the control module. The scan tool will display Yes when the control module is receiving a signal from the CMP sensor. The scan tool will display No when the control module has not received a signal from the CMP sensor after receiving signals from the crankshaft position sensor.

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.

Cycles Of Misfire Data: This parameter displays the number of cylinder firing events that were recorded as misfires as determined by the control module.

Cylinder 1 and 4 IC Circuit Status: This parameter displays the status of the output driver for the ignition control circuits. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

Cylinder 2 and 5 IC Circuit Status: This parameter displays the status of the output driver for the ignition control circuits. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

Cylinder 3 and 6 IC Circuit Status: This parameter displays the status of the output driver for the ignition control circuits. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

Cylinder 1-6 Injector Circuit History: This parameter displays the diagnostic state history of the output driver for the injector control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Low/Open if there is an open or short to ground on the injector circuit. The scan tool will display High if there is a short to voltage on the injector circuit.

Cylinder 1-6 Injector Circuit Status: This parameter displays the current status of the output driver for the injector control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

Decel. Fuel Cutoff: This parameter displays the status of the operating mode used to turn off the fuel injectors during certain deceleration conditions. When the scan tool displays Active, the control module has turned off the fuel injectors. When the scan tool displays Inactive, the fuel system is operating normally.

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 percent and voltage.

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

Driver Module 1 Status: This parameter displays the status of output driver module 1. The scan tool displays Enabled, off-high volts, off-low volts, or invalid state.

Driver Module 2 Status: This parameter displays the status of output driver module 2. The scan tool displays Enabled, off-high volts, off-low volts, or invalid state.

Driver Module 3 Status: This parameter displays the status of output driver module 3. The scan tool displays Enabled, off-high volts, off-low volts, or invalid state.

EC Ignition Relay Circuit Status: This parameter displays the status of the output driver for the EC Ignition Relay control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

EC Ignition Relay Circuit History: This parameter displays the diagnostic state history of the output driver for the EGR Solenoid circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Low/Open if there is an open or short to ground on the injector circuit. The scan tool will display High if there is a short to voltage on the injector circuit.

ECT Sensor: This parameter displays the temperature of the engine coolant 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.

EGR Flow Test Count: Indicates the number of EGR flow test samples collected during the current ignition cycle. The maximum number of samples allowed is one during normal operation. If the PCM battery feed has been disconnected or a DTC P0401 has been cleared, 10 EGR flow test samples will be allowed during the next ignition cycle. This is to allow repair verification during a single ignition cycle.

EGR Learned Minimum Position: The scan tool displays 0-5.0 volts. This display represents the voltage that the PCM uses in order to determine whether or not the EGR valve is closed. The voltage displayed will be the closed position of the EGR pintle learned by the PCM. Represents the learned voltage that the PCM uses to determine whether or not the EGR valve is fully closed, 0 percent pintle position. If the EGR pulse width modulation (PWM) is 0 percent and a difference of more than 0.4 volts between EGR Feedback and EGR closed valve pintle position is detected an EGR DTC will set.

EGR Position Sensor: This parameter displays the voltage from the exhaust gas recirculation (EGR) valve position sensor. This information provides the control module with the exact position of the EGR valve pintle. When the EGR valve is closed, the scan tool will display a low voltage. When the EGR valve is open, the scan tool will display a high voltage.

EGR Position Sensor: This parameter displays the position of the exhaust gas recirculation (EGR) valve pintle in percent. The scan tool will display 0 percent when the EGR valve is closed. The scan tool will display 100 percent when the EGR valve is fully open.

EGR Position Variance: This parameter displays the difference between the desired EGR valve position and the actual EGR position. The scan tool will display this difference in percent. Scan tool range 0 percent to 100 percent. displays the difference between Desired EGR Position and actual EGR Position currently being monitored by the PCM. If the EGR Position Error reaches an unacceptable level, an EGR DTC will set.

EGR Solenoid Circuit History: This parameter displays the diagnostic state history of the output driver for the EGR Solenoid circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Low/Open if there is an open or short to ground on the injector circuit. The scan tool will display High if there is a short to voltage on the injector circuit.

The scan tool displays OK/Fault: EGR Solenoid Circuit Status. This parameter displays the status of the output driver for the EGR solenoid control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

EGR Solenoid Command: This parameter displays the duty cycle commanded by the control module for the EGR valve in percent. 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. The scan tool range is 0 percent to 100 percent. The exhaust gas recirculation (EGR) duty cycle specifies the EGR valve on (valve open) time rate within a certain set cycle. Zero percent means that the valve is completely closed while a 100 percent is a fully open valve.

Engine Load: This parameter displays the engine load in percent based on inputs to the control module from 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 Pressure Switch: This parameter displays the state of the engine oil pressure as determined by the control module. The control module monitors the engine oil pressure switch to determine if the engine oil pressure is sufficient. The scan tool will display low when the engine oil pressure is below a predetermined value. The scan tool displays OK or Low. This parameter displays whether or not sufficient engine oil pressure is present.

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 Speed: This parameter displays the speed of the crankshaft as determined by the control module using an input from the Crankshaft Position (CKP) Sensor. The scan tool will display a high value at high engine speeds and a low value at low engine speeds.

EVAP Fault History: This parameter displays the result of the EVAP system diagnostic. Scan tool displays NO FAULT, EXCESS VACUUM, PURGE VALVE LEAK, SMALL LEAK, or WEAK VACUUM. The EVAP Fault History indicates the status of EVAP system diagnostics performed by the PCM.

EVAP Purge Solenoid Circuit History: This parameter displays the diagnostic state history of the output driver for the EVAP Purge Solenoid circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Low/Open if there is an open or short to ground on the injector circuit. The scan tool will display High if there is a short to voltage on the injector circuit.

EVAP Purge Solenoid Circuit Status: This parameter displays the status of the output driver for the evaporative emission purge solenoid control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

EVAP Purge Solenoid Command: This parameter displays the on-time or duty cycle of the evaporative emission (EVAP) purge solenoid commanded by the control module expressed as a percent. The scan tool will display a high percentage when the control module is commanding the EVAP purge solenoid to be open a large amount. The scan tool will display a low percentage when the control module is commanding the EVAP purge solenoid to be open a small amount. The scan tool will display 0 when the control module is commanding the EVAP purge solenoid closed.

EVAP Test Abort Reason: Indicates if the vehicle is outside the running conditions too run the EVAP test and was aborted. Provides additional information relative to the EVAP Test Result parameter. The scan tool displays Not Aborted, Lost Enable, Small Leak, Veh. Not at Rest. This parameter indicates the reason the EVAP system test was aborted.

EVAP Test Result: Indicates if the EVAP test has run and passed. This information can be used to check system operation. Operate the vehicle within the conditions required to enable the diagnostic (refer to the EVAP DTC's supporting text ). This parameter displays the results of the EVAP system diagnostic tests.

EVAP Test State: Indicates the current status of the EVAP diagnostic routine. The scan tool displays Wait For Purge, Test Running, Test Complete. This parameter indicates the state of the EVAP Service Bay test.

EVAP Vent Solenoid Circuit History: This parameter displays the diagnostic state history of the output driver for the EVAP Vent Solenoid circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Low/Open if there is an open or short to ground on the injector circuit. The scan tool will display High if there is a short to voltage on the injector circuit.

EVAP Vent Solenoid Circuit Status: This parameter displays the status of the output driver for the evaporative emission vent solenoid control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

EVAP Vent Solenoid Command: This parameter displays the state of the evaporative emission (EVAP) vent solenoid commanded by the control module expressed as a Venting or Not Venting. The scan tool will display a venting when the control module is commanding the EVAP vent solenoid to be open. The scan tool will display a not venting when the control module is commanding the EVAP vent solenoid to be closed.

FC Relay 1 Circuit History: This parameter displays the diagnostic state history of the output driver for the FC Relay 1 circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Low/Open if there is an open or short to ground on the injector circuit. The scan tool will display High if there is a short to voltage on the injector circuit.

FC Relay 1 Circuit Status: This parameter displays the status of the output driver for the cooling fan relay 1 control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

FC Relay 2 and 3 Circuit History: This parameter displays the diagnostic state history of the output driver for the FC Relay 2 and 3 circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Low/Open if there is an open or short to ground on the injector circuit. The scan tool will display High if there is a short to voltage on the injector circuit.

FC Relays 2 and 3 Circuit Status: This parameter displays the status of the output driver for the cooling fan relays 2 and 3 control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

Fuel Level Sensor: This parameter displays the approximate fuel level in the fuel tank as a voltage. The control module calculates this level using the signal from the sensor used to monitor the fuel level in the fuel tank. The scan tool will display a low reading when the fuel level in the tank is low or near empty. The scan tool will display a high reading when the fuel level in the tank is high or near full.

Fuel Pump Relay Circuit History: The scan tool displays OK / Fault. This parameter saves the state of the driver circuit for this device. Scan tool displays Fault or OK. Represents the diagnostic state history of the output driver for the Fuel Pump relay control circuit.

Fuel Pump Relay Circuit Status: This parameter displays the status of the output driver for the fuel pump relay control circuit. The scan tool will display OK if the circuit is operating correctly. The scan tool will display Fault if there is an open, short to ground or a short to voltage on the circuit.

Fuel Pump Relay Command: This parameter displays the commanded state of the fuel pump relay control circuit. The fuel pump relay should be on when the scan tool indicates the Fuel Pump Relay Command is On. The fuel pump relay should be off when the scan tool indicates the Fuel Pump Relay Command is Off.

Fuel Tank Level Remaining: This parameter displays the amount of fuel remaining in the fuel tank as a percentage. The control module calculates this level using the signal from the sensor used to monitor the fuel level in the fuel tank. The scan tool will display a low reading when the fuel level in the tank is low or near empty. The scan tool will display a high reading when the fuel level in the tank is high or near full.

Fuel Tank Pressure Sensor: This parameter displays the fuel tank pressure as calculated based on a signal sent to the control module from the fuel tank pressure (FTP) sensor. The scan tool will display a low value when the pressure in the fuel tank is low or a vacuum. The scan tool will display a high value when the pressure in the fuel tank is high.

Fuel Trim Cell: This parameter displays the fuel trim cell number as calculated by the control module based on engine speed and load inputs. The scan tool will display a lower number as conditions are nearer to idle, and a higher value as conditions approach maximum engine speed and maximum load.

Fuel Trim Learn: This parameter indicates if the control module is adjusting long term fuel trim in response to the short term fuel trim. The scan tool displays Enabled or Disabled. When conditions are appropriate for enabling long term fuel trim corrections, the scan tool displays Enabled.

HO2S Bank 1 Sensor 1: A YES display indicates that the oxygen sensor is warmed up and is capable of sending useful voltage readings to the PCM. A NO display indicates a cold (not ready) oxygen sensor. Indicates the status of the fuel control exhaust oxygen sensor. The scan tool will indicate that the exhaust oxygen sensors are ready when the PCM detects a fluctuating HO2S voltage sufficient to allow closed loop operation. This will not occur unless the exhaust oxygen sensors are warmed up.

HO2S Bank 1 Sensor 1 Ready: A YES display indicates that the oxygen sensor is warmed up and is capable of sending useful voltage readings to the PCM. A NO display indicates a cold (not ready) oxygen sensor. Indicates the status of the fuel control exhaust oxygen sensor. The scan tool will indicate that the exhaust oxygen sensors are ready when the PCM detects a fluctuating HO2S voltage sufficient to allow closed loop operation. This will not occur unless the exhaust oxygen sensors are warmed up.

HO2S Bank 1 Sensor 2: The scan tool displays mV. The scan tool displays a range of 0-1,106 mV. The HO2S bank 2 sensor 2 parameter represents the exhaust oxygen sensor output voltage. The voltage fluctuates constantly within a range between 10 mV, and 1,000 mV, while operating in Closed Loop. The scan tool displays 0 to 1275 mV. This parameter is the actual voltage on the HO2S signal circuit as measured by the ECM.

HO2S Bank 1 Sensor 2 Ready: A YES display indicates that the oxygen sensor is warmed up and is capable of sending useful voltage readings to the PCM. A NO display indicates a cold (not ready) oxygen sensor. Indicates the status of the post catalyst oxygen sensor. The scan tool will indicate that the exhaust oxygen sensors are ready when the PCM detects a fluctuating HO2S voltage.

HO2S Bank 2 Sensor 1: This parameter indicates the heated oxygen sensor (HO2S) bank 1 sensor 1 output voltage as measured by the control module. The scan tool value fluctuates constantly while operating in Closed Loop. The scan tool will display a higher value during rich running conditions, and a lower value during leaner running conditions.