K20 Engine Control Module: Scan Tool Information
The Engine Control Module Scan Tool Data List contains all engine 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) are set.
- On-board diagnostics are functioning properly.
The scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The Engine Scan Tool Data List represents values that may be seen on a normally running engine.
Only the parameters listed below are referenced in this service information for use in diagnosis. If all values are within the typical range described below, refer to Symptoms - Engine Controls , for engine diagnosis.
Engine Control Module Scan Tool Data Parameters
| Parameter | System State | Expected Value | Description |
|---|---|---|---|
| Operating Conditions: Engine Idling / Radiator Hose Hot / Closed Throttle / Park or Neutral / Closed Loop / Accessories Off / Brake Pedal Released | |||
| A/C High Side Pressure Sensor | A/C ON | 1.0 - 4.0 V | This parameter displays the voltage from the A/C high side pressure sensor signal circuit to the control module. |
| A/C Compressor Clutch Relay Command | A/C ON | On | This parameter displays the state of the air conditioning (A/C) clutch relay control circuit as commanded by the control module. |
| A/C Request Signal | A/C ON | On | This parameter displays the state of the A/C request input to the control module from the heating, ventilation, and air conditioning (HVAC) controls. |
| Air/Fuel Diagnostic Monitor 1 | Ignition ON | Incomplete/Complete | DTC P219A self-diagnosis is Incomplete/Complete |
| Air/Fuel Diagnostic Monitor 2 | Ignition ON | Not present/Present | DTC P219A self-diagnosis is on standby or under diagnosis. |
| Air/Fuel Equivalence Ratio Command | - | Varies | 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 approximately 14.7 to 1. |
| Air/Fuel Ratio Correction Factor | - | Varies | The mean value of the air-fuel ratio feedback correction factor per cycle is indicated. |
| APP Sensor 1 | Accelerator pedal not actuated | 0.6 - 0.9 V | 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 | 4.0 - 4.8 V | ||
| APP Sensor 2 | Accelerator pedal not actuated | 0.6 - 0.9 V | 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 | 4.0 - 4.8 V | ||
| Battery Current Sensor | Engine running Battery fully charged Idle speed |
2600 - 3500 mV | The signal voltage of the battery current sensor is displayed. |
| Base Injector Fuel Rate | Engine running | ms | The mean value of the air-fuel ratio feed-back correction factor per cycle is indicated. |
| Brake Pedal Position Circuit Signal | - | Applied/Released | Indicates condition of brake pedal. |
| Brake Pedal Switch 1 Status | Ignition On | Off/On | Indicates On/Off condition from ASCD brake switch signal. |
| Brake Pedal Switch 1 Status | Ignition On | Off/On | Indicates On/Off condition from ASCD brake switch signal. |
| Brake Pedal Switch 2 Status | Ignition On | Off/On | Indicates On/Off condition from stop lamp switch signal. |
| Calculated Air Flow | Engine at Idle, no load | 10 - 35 % | Calculated load value indicates the value of the current airflow divided by peak airflow. |
| Engine speed at 2500 RPM, no load | 10 - 35 % | ||
| Catalyst Monitor Complete | - | Complete/Incomplete | This parameter indicates the status of the Catalyst. The scan tool displays YES when the diagnostic is complete. And NO if the diagnostic has not run, or a malfunction is detected in the catalyst. |
| Cooling Fan Speed | - | Hi/Mid/Low/Off | Indicates the condition of the cooling fan (determined by the ECM according to the input signals). |
| Crankshaft Position Active Counter | - | Counts | Indicates crank position sensor pulse counts. |
| Cruise Control Low Speed Shut-Off | - | Active/Inactive | Indicates the vehicle cruise condition. |
| Cruise Control Cancel Switch | - | On/Off | Indicates (On/Off) condition from SET/COAST switch signal. |
| Cruise Control Main Indicator Command | - | On/Off | Indicates (On/Off) condition of the cruise lamp determined by the ECM according to the input signal. |
| Cruise Control Requesting Transmission Overdrive Inhibit | - | On/Off | Indicates (On/Off) condition of A/T O/D cancel request signal. |
| Cruise Control Resume/Acceleration Switch | - | On/Off | Indicates (On/Off) condition from Resume/Acceleration Switch signal. |
| Cruise Control Set Switch | - | On/Off | Indicates (On/Off) condition of SET/COAST switch signal. |
| Cruise Control Switch | - | On/Off | Indicates (On/Off) condition of MAIN switch signal. |
| Cruise Control Vehicle Speed Versus Set Speed Shut-Off | - | Inactive/Active | Indicates the vehicle cruise condition. |
| Distance with MIL On | - | km/h (mph) | This parameter displays the distance accumulated while MIL is activated. |
| ETC Sensor | - | °C (°F) Varies |
The engine coolant temperature (determined by the signal voltage of the engine coolant temperature sensor) is displayed. |
| Engine Oil Pressure Sensor | Engine speed at idle | Approx. 1450 mV | The signal voltage of EOP sensor is displayed. |
| Engine speed at 2000 RPM, no load | Approx. 2850 mV | ||
| Engine Oil Temperature | - | °C (°F) | The engine oil temperature (determined by the signal voltage of the engine oil temperature sensor) is displayed. |
| Engine Speed | - | mph (km/h) Varies |
Indicates the engine speed computed from the signal of the crankshaft position sensor (POS) and camshaft position sensor (PHASE). |
| EVAP Monitor Complete | - | Complete/Incomplete | This parameter displays if the most recent evaporative emissions diagnostic test is complete. |
| EVAP Monitor Enabled | - | Yes/No | Indicates the ready condition of EVAP leak diagnosis. |
| EVAP Purge Solenoid Valve Command | - | % Varies |
Indicates the EVAP canister purge volume control solenoid valve control value computed by the ECM according to the input signals. The opening becomes larger as the value increases. |
| EVAP Vent Solenoid Valve Command | - | On/Off | The control condition of the EVAP canister vent control valve (determined by the ECM according to the input signals) is indicated. |
| Fuel Level Sensor | - | Volts | The signal voltage of the fuel level sensor is displayed. |
| Fuel Pump Relay Command | - | On/Off | Indicates the fuel pump relay control condition determined by the ECM according to the input signals. |
| Fuel Tank Pressure Sensor | - | Volts | The signal voltage of the EVAP control system pressure sensor is displayed. |
| Fuel Temperature Sensor | Ignition On | °C (°F) | The fuel temperature (determined by the signal voltage of the fuel tank temperature sensor) is displayed. |
| Heavy Electrical Load | Ignition On | On/Off | Indicates (On/Off) condition from the electrical load signal. |
| HO2S 1 | Engine at operating temperature. Engine speed is 2000 RPM |
Fluctuates around 2.2 V | The HO2S signal computed from the input signal of the air fuel ratio HO2S 1 is displayed. |
| HO2S 1 Diagnostic Monitor 1 | - | Complete/Incomplete | Indicates DTC P015A or P015B self-diagnosis condition. |
| HO2S 1 Diagnostic Monitor 2 | - | Complete/Incomplete | Indicates DTC P014C or P014D self-diagnosis condition. |
| HO2S 1 Diagnostic Monitor 3 | - | Absent/Present | Indicates DTC P014C, P014D, P015A, or P015B self-diagnosis condition. |
| HO2S 1 Heater Command | Engine speed at idle | 4 - 100 % | HO2S 1 heater control value computed by the ECM according to the input signals. The current flow to the heater becomes larger as the value increases. |
| HO2S 1 Heater Command | - | On/Off | This parameter display the state of the HO2S heater control circuit as commanded by the control module. |
| HO2S 2 | Engine at operating temperature | Volts Varies |
The signal voltage of the HO2S 2 is displayed. |
| HO2S 2 Diagnostic Monitor 1 | - | Complete/Incomplete | Indicates DTC P0139 self-diagnosis (delayed response) condition. |
| HO2S 2 Diagnostic Monitor 2 | - | Complete/Incomplete | Indicates DTC P0139 self-diagnosis (slow response) condition. |
| HO2S 2 Heater Command | - | On/Off | Indicates (On/Off) condition of HO2S 2 heater determined by the ECM according to the in put signal. |
| HO2S 2 Heater Monitor complete | - | Complete/Incomplete | This parameter displays the current state of the H02S 2 heater monitor. |
| HVAC Fan Request Signal | Engine at operating temperature Engine Speed at idle |
On/Off | Indicates (On/Off) condition from the heater fan switch signal. |
| IAT Sensor | - | -39 to +140°C (-38 to +284°F) | This parameter displays the temperature of the air entering the air induction system based on input to the control module from the intake air temperature (IAT) sensor. |
| Ignition 1 Signal | - | On/Off | Indicates (On/Off) condition from ignition switch signal. |
| Ignition Timing | Engine speed at idle, no load | 1 - 11 ° BTDC | Indicates the ignition timing computed by the ECM according to the input signals. |
| Engine speed 2000 RPM, no load | 25 - 45 ° BTDC | ||
| Injector Duty Cycle | Engine at operating temperature Engine speed at idle |
2.0 - 3.0 ms | Indicates the actual fuel injection pulse width compensated by the ECM according to the input signals. |
| Engine speed 2500 RPM, no load | 1.9 - 2.9 ms | ||
| Intake Camshaft Position Bank 1 | Engine at operating speed No load |
° Varies |
Indicates (°CA) of intake camshaft advance angle. |
| Intake Camshaft Position Command | Engine at operating temperature Engine speed at idle |
0 - 2 % | The control value of the intake valve timing control solenoid valve (determined by the ECM according to the input signals) is indicated. The advance angle becomes larger as the value increases. |
| Engine speed 2000 RPM, no load | 0 - 90 % | ||
| MAF Sensor | Engine at operating temperature Engine speed at idle |
1.0 - 4.0 g/s | Indicates the mass airflow computed by the ECM according to the signal voltage of the mass airflow sensor. |
| Engine speed 2000 RPM, no load | 2.0 - 10.0 g/s | ||
| MAF Sensor | - | volts | The signal voltage of the mass air flow sensor is displayed. |
| O2S/HO2S Monitor Complete | - | Complete/Incomplete | This parameter displays the enable and completion status during the current driving/monitoring cycle of each continuous legislated emission related monitor and non continuous legislated emission related monitor. |
| Park/Neutral Position Switch | Ignition On | Park/Neutral/In Gear | This parameter indicates the range selection of the automatic transmission as calculated by the control module based on input from the PNP switch. The scan tool will display, In Gear, Park, or Neutral depending on the PNP switch position. |
| Power Steering Switch | - | On/Off | Indicates (On/Off) condition from the electrical load signal. |
| Starter Relay Command | - | On/Off | Indicates start signal status (On/Off) computed by the ECM according to the signals of the engine speed and battery voltage. |
| Throttle Plate at idle Position | Ignition On | Yes/No | Indicates idle position (On/Off) computed by the ECM according to the accelerator pedal position sensor signal. |
| Throttle Position Learn | - | Complete/Incomplete | Display the condition of idle Air Volume Learning. |
| Throttle Position Sensor 1 | Ignition On/Accelerator pedal fully released | Greater than 0.36 V | The throttle position sensor signal voltage is displayed. |
| Ignition On/Accelerator pedal fully depressed | Less than 4.75 V | ||
| Throttle Position Sensor 2 | Ignition On/Accelerator pedal fully released | Greater than 0.36 V | The throttle position sensor signal voltage is displayed. |
| Ignition On/Accelerator pedal fully depressed | Less than 4.75 V | ||
| Transmission in Overdrive | Ignition On | On/Off | Indicates (On/Off) condition of A/T O/D according to the input signal from the TCM. |
| Transmission Input Speed | Vehicle speed greater than 20 km/h (mph) | RPM | Indicates the engine speed computed from the input speed sensor signal. |
| Vehicle Speed Sensor | - | 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 (VSS). |
Engine Control Module (ECM) Scan Tool Output Controls
| Output Control | Description |
|---|---|
| Cooling Fan | Select Low, Medium, or High speed on the Scan Tool Screen. The scan tool initiates the test when the following conditions are met:
|
| Cylinder Power Balance | This function is used to cut off each fuel injector signal one at a time using the Scan Tool. The scan tool initiates the test when the following conditions are met:
|
| Engine Coolant Temperature | This function is used to Decrease or Increase the signal from the ECT sensor. |
| EVAP Purge Solenoid Valve | This function is used to change the EVAP canister purge volume control solenoid valve opening percent using the Scan Tool. The scan tool indicates the test when the following conditions are met:
|
| EVAP Vent Solenoid Valve | This function controls the EVAP vent solenoid. The normal commanded state is none. When commanded ON, the vent valve switches to not venting. When commanded OFF, the vent valve switches to venting. The scan tool indicates the test when the following conditions are met:
|
| Fuel Pump Relay | This function controls the fuel pump relay. The normal commanded state is None. When commanded ON or OFF, the ECM turns the fuel pump ON or OFF. The scan tool initiates the test when the following conditions are met:
|
| Fuel Injector Balance | This function is used to Increase or Decrease the amount of fuel injection is using. The scan tool initiates the test when the following conditions are met:
|
| Fuel Temperature | This function is used to Increase or Decrease the signal from the fuel temperature. |
| Ignition Timing | This function is used to Increase or Decrease the spark retard angle from 0 - 10 degrees. |
| Intake Camshaft Position Actuator | This function controls the selected camshaft actuator solenoid. The normal commanded state is None. The system will increase or decrease the angle of the selected camshaft plus/minus 10 degree increments. |
| Throttle Position Learn | This device control is used to reset the learned airflow adaptive values to their initial values. |