K20 Engine Control Module: Scan Tool Information
The ECM scan tool data list contains all ECM related parameters that are available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists and in some cases may appear more than once or in more than one data list in order to group certain related parameters together.
Use the engine scan tool data list only after the following is determined:
- The Diagnostic System Check - Vehicle is completed.
- No diagnostic trouble codes (DTCs)
- On-board diagnostics are functioning properly
The scan tool values from a properly running vehicle may be used for comparison with the vehicle you are diagnosing. The ECM scan tool data list represents values that would be seen on a normally running vehicle.
NOTE:
A scan tool that displays faulty data should not be used. The scan tool concern should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.
Only the parameters listed below are referenced in this service manual for use in diagnosis.
ECM Scan Tool Data Parameters
| Parameter | System State | Expected Value | Description |
|---|---|---|---|
| Operating Conditions: Vehicle On/Park or Neutral/Accessories Off/Brake Pedal Released | |||
| 14V Power Module Setpoint | Vehicle On | Percent | The target output percentage the 14V Power Module will try to maintain. |
| 14V Power Module Setpoint | Vehicle On | Volts | The target output the 14V Power Module will try to maintain in volts. |
| 5V Reference 1, 2, 3 or 4 | Vehicle ON | 5V | This parameter displays the voltage sensed on the 5V reference circuits 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. |
| 5V Reference 1, 2, 3 or 4 Circuit Status | Vehicle ON | OK | This parameter displays OK if there is no 5V reference circuit condition. If the circuit is shorted to ground or shorted to B+, Malfunction is displayed. |
| Accelerator Pedal Position | Accelerator pedal not actuated | 0% | This parameter displays the angle of the APP as calculated by the control module using the signals from the APP sensors. |
| Accelerator pedal fully actuated | 100% | ||
| Active Grille Air Shutter Position | % | Varies | The actual PWM duty cycle output to the actuator. Active Grill Air Shutters are flaps controlled by the ECM at the front grilleto control the amount of air flow. |
| Active Grille Air Shutter Position Command | % | Varies | This parameter displays the commanded PWM duty cycle output to the actuator. Active Grill Air Shutters are flaps controlled by the ECM at the front grilleto control the amount of air flow. |
| Ambient Air Temperature | °C (°F) | Varies | This parameter displays the surrounding air temperature, at any given altitude. |
| APP Sensor 1 | Accelerator pedal not actuated | 0.88-1.08V | This parameter displays the actual voltage on the accelerator pedal position (APP) Sensor 1 signal circuit as measured by the control module. |
| Accelerator pedal fully actuated | 4.17-4.37V | ||
| APP Sensor 1 Circuit Status | Vehicle ON | OK | This parameter displays the APP Sensor 1 Out of Range indicates that the sensed accelerator pedal position 1 sensor value is currently out of range or that a Malfunction has been detected based upon the sensed accelerator pedal position 1 sensor value being out of range. |
| APP Sensor 1 Position | Accelerator pedal not actuated | 0% | This parameter displays 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. |
| Accelerator pedal fully actuated | 100% | ||
| APP Sensor 2 | Accelerator pedal not actuated | 0.39-0.59V | This parameter displays the actual voltage on the accelerator pedal position (APP) Sensor 2 signal circuit as measured by the control module. |
| Accelerator pedal fully actuated | 2.02-2.22V | ||
| APP Sensor 2 Circuit Status | Vehicle ON | OK | This parameter displays the APP Sensor 2 Out of Range indicates that the sensed accelerator pedal position 2 sensor value is currently out of range or that a Malfunction has been detected based upon the sensed accelerator pedal position 1 sensor value being out of range. |
| APP Sensor 2 Position | Accelerator pedal not actuated | 0% | 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. |
| Accelerator pedal fully actuated | 100% | ||
| APP Sensor 2 Learned Applied Position | % | % | This parameter displays the learned maximum (fully applied) position of Accelerator Pedal Position (APP) Sensor 2. |
| APP Sensor 2 Learned Released Position | - | Volts | This parameter displays the accelerator pedal sensor 2 signal at its minimum learned position (pedal released) as a percentage of its reference voltage. (The minimum learned position is automatically updated) periodically as determined by an algorithm. This is not a static value from a single learn event.) |
| APP Sensors | - | 0% | This parameter displays the average of the APP sensors as calculated by the throttle actuator control (TAC) module. The APP average 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. |
| Axle Torque | - | This parameter displays the torque request for the slow response air path (control of the throttle). Based on current conditions the hybrid controller determines the optimum engine torque, which it sends as a request to the Engine Control Module. | |
| Brake Pedal Position Sensor Signal | % | % | This parameter displays the device that measures or monitors the relative position of the brake pedal as it travels from a position where it is fully depressed to a position where the driver's foot is completely off the pedal or vice versa. |
| Cold Temperature Mode | On/Off | On/Off | The scan tool displays On or Off. This is the current state of the Cold Temperature Mode. |
| Cruise Control | Enabled/Disabled | Disabled | This parameter displays the status of the cruise control system as determined by the control module. |
| Cruise Control Cancel Switch | Cruise Control ON | Active/Inactive/Invalid | This parameter displays the status of the cruise control cancel switch. |
| Cruise Control Disengage History 1-8 | Cruise Control ON | Reason for Cruise Disengagement | The parameter displays the last 8 cruise control disengages in order from 1-8, with 8 being the most recent. There are approximately 40 possible causes for the cruise control to disengage. |
| Cruise Control Inhibit Reason | Cruise Control ON | Varies | The parameter displays the reason why the cruise control system is inhibited. There are approximately 40 possible causes for the cruise control to be inhibited. |
| Cruise Control On/Off Switch | Cruise Control ON | ON/OFF | This parameter displays the ECM monitored status of the cruise control switch. A closed switch is displayed as ON. |
| Cruise Control Resume/Accelerate Switch | Cruise Control ON | Active/Inactive/Invalid | This parameter displays ON, when the cruise ON/OFF switch is ON and the resume switch is pressed, the ECM detects a predetermined voltage value for the resume switch. |
| Cruise Control Set/Coast Switch | Cruise Control ON | Active/Inactive/Invalid | This parameter displays ON, when the cruise ON/OFF switch is ON and the ECM detects a predetermined voltage value for the set switch. |
| Distance Since DTC Cleared | - | Varies | This parameter displays the distance accumulated since an emission diagnostic trouble code was cleared. The scan tool will display increasing distance as the vehicle is driven. |
| Distance Since First Malfunction | Vehicle ON | 0 km/h (0 MPH) | This parameter displays in kilometers or miles the distance traveled since a Malfunction occurred. |
| Distance Since Last Malfunction | - | Varies | This parameter displays the distance accumulated when the emission diagnostic trouble code last failed. |
| Driver Requested Axle Torque | - | Varies | This parameter displays the drivers requested axle torque as determined by the ECM. The ECM monitors accelerator pedal position and determines how much axle torque is required in order to meet the drivers request. The parameter display range is -8192 to +8191.75. |
| ECM Authentication Status | Vehicle ON | Unknown/Incorrect /Negative Response/Valid | This parameter displays the ECM Authentication Status result of the comparison between the last received immobilizer response and the expected response calculated into the ECM. |
| ECM Response Source | Vehicle ON | Ignition Switch Start/Remote Vehicle Start/Exterior Power Take Off (PTO) Vehicle Start | This parameter displays the ECM Response Source used to calculate the ECM response. |
| Extended Travel Brake Pedal Position Signal | Applied/Released/Invalid | Released | This parameter displays the brake pedal travel beyond a moderate/extended travel threshold by the platform brake sensing module and is received over serial data. |
| Hood Position | Open/Closed | Closed | This parameter displays the status of the hood latch switch as determined by the ECM. |
| Ignition Input Accessory | Active/Inactive | This parameter displays the voltage of the accessory feed circuit of the hybrid powertrain control module. The parameter display range is 0-65.535V. | |
| Ignition Input Off/On/Start | Active/Inactive | Active | This parameter displays the voltage of the ignition feed circuit of the hybrid powertrain control module. The parameter display range is 0-65.535V. |
| Ignition 1 Signal | Volts | Varies | This parameter displays the voltage of the ignition feed circuit of the ECM. |
| Immobilizer Auto Learn Counter | Counts | Varies | This indicates the number of autolearn cycles that have been successfully completed within the immobilizer system. |
| Immobilizer Automatic Learn Timer | hh:mm:ss | Varies | This indicates the time elapsed within the current autolearn cycle within the immobilizer system. |
| Immobilizer Password Learn | - | Yes | This parameter displays Yes when a valid theft password has been learned. |
| Immobilizer Security Code Accepted | Yes/No | Yes | This parameter displays that the Security Code Accepted received is correct. |
| Immobilizer Security Code Lockout | Active/Inactive | Inactive | This parameter displays the Security Code Lockout Active has not passed and lockout is active. |
| Immobilizer Security Code Lockout Timer | ms | Varies | This parameter displays the time elapsed since the receipt of the correct security code within the immobilizer system. |
| Immobilizer Security Code Programmed | - | Yes | This parameter displays if the immobilizer system security code has been programmed. |
| Immobilizer Security Code Programming Counter | Counts | Varies | This parameter displays the number of times a new immobilizer security code has been programmed through secure access. This counter can only be incremented. |
| Immobilizer Security Information Programmed | Yes/No | Yes | This parameter displays that the immobilizer key has been programmed. |
| Immobilizer System Status | - | Varies | This parameter displays the current state of the immobilizer System Status. The states include the following: Standby, Disabled at Startup, Disabled Due to No Response, Disabled Due to Negative Response, Disabled Due to Incorrect Response, Post Release, Pre-Release, Released. |
| Internal Mode Switch | Park, Reverse, Neutral, Drive, Low, Invalid | Park | This switch indicates transmission range. This is a contact switch attached to the control valve body within the transmission. The 9 outputs from the switch indicate which position is selected by the transmission manual shaft. |
| Internal Mode Switch A/B/C/P | High/Low | Low/High/High/Low | This displays the position of each internal mode switch state. A/B/C/P are identification for the 4 switches. |
| MIL Command | Vehicle ON | ON/OFF | This parameter displays the commanded state of the malfunction indicator lamp (MIL) control circuit by the engine control module (ECM). |
| MIL Control Circuit High Voltage Test Status | - | OK | This parameter displays the status of the control circuit for the malfunction indicator lamp (MIL) control. The scan tool displays OK, Malfunction or Not Run. OK indicates that no circuit malfunctions are detected during the current test. |
| MIL Control Circuit Low Voltage Test Status | - | OK | This parameter displays the status of the control circuit for the malfunction indicator lamp (MIL) control. The scan tool displays OK, Malfunction or Not Run. OK indicates that no circuit malfunctions are detected during the current test. |
| MIL Control Circuit Open Test Status | - | OK | This parameter displays the status of the control circuit for the malfunction indicator lamp (MIL) control. The scan tool displays OK, Malfunction or Not Run. OK indicates that no circuit malfunctions are detected during the current test. |
| MIL Requested by DTC | Vehicle ON | Yes/No | This parameter displays the reason the engine control module illuminated the MIL. The scan tool will display Yes when the MIL is requested as a result of an A or B type DTC. The scan tool will display No if the MIL is illuminated for another reason, such as transmission DTCs. |
| Power Mode | Vehicle ON | OFF/Accessory/Run /Crank Request | This Parameter displays the state of the System Power Mode. This signal is based upon the state of the system power mode received over serial communication from the vehicle electronics. If the serial data signal not received, the Parameter will display OFF. |
| Remote Vehicle Start Disable History 1-8 | - | Varies | This parameter indicates one of the last eight reasons the powertrain has disabled the remote vehicle start. |
| Remote Vehicle Start Request Signal | On/Off | On | This parameter indicates if the vehicle has been requested to On due to a remote start command. |
| Transmission Fluid Temperature | °C | Varies | This parameter displays the transmission fluid temperature as reported by the transmission fluid temperature sensor. |
| Vehicle Speed | - | 0 km/h (0 MPH) | This parameter displays the speed of the vehicle as calculated by the transmission control module (TCM) from information received from the vehicle speed sensor. |
ECM Scan Tool Output Controls
| Control Function | Description |
|---|---|
| Active Grille Air Shutter Position | This test will be used to cycle the Air shutter from open to closed. Upon successfully closing a Pass/No Pass condition will be shown to the technician based on a Validity bit supplied by the ECM. |
| Malfunction Indicator Lamp (MIL) | This function controls the malfunction indicator lamp (MIL). The normal commanded state is None. When commanded ON or OFF, the ECM turns the malfunction indicator lamp (MIL) ON or OFF. This output can also be monitored on the scan tool data parameter MIL Command. The system remains in the commanded state until cancelled by the scan tool. |
| 14V Power Module Setpoint | This function controls the target output the 14V Power Module will try to maintain. |