Part Two
Part TwoHO2S Bank 1 Sensor 1: The scan tool displays a range of 0-1,106 mV. The heated oxygen sensor (HO2S) bank 1 sensor 1 parameter represents the fuel control exhaust oxygen sensor output voltage. The voltage fluctuates constantly within a range between 10-1,000 mV, while operating in Closed Loop.
HO2S Bank 1 Sensor 2: The scan tool displays a range of 0-1,106 mV. The heated oxygen sensor (HO2S) bank 1 sensor 2 parameter represents the fuel control exhaust oxygen sensor output voltage. The voltage fluctuates constantly within a range between 10-1,000 mV, while operating in Closed Loop.
HO2S Bank 2 Sensor 1: The scan tool displays a range of 0-1,106 mV. The heated oxygen sensor (HO2S) bank 2 sensor 1 parameter represents the exhaust oxygen sensor output voltage. The voltage fluctuates constantly within a range between 10-1,000 mV, while operating in Closed Loop.
HO2S Bank 2 Sensor 2: The scan tool displays a range of 0-1,106 mV. The heated oxygen sensor (HO2S) bank 2 sensor 2 parameter represents the fuel control exhaust oxygen sensor output voltage. The voltage fluctuates constantly within a range between 10-1,000 mV, while operating in Closed Loop.
HO2S Heater Bn 1 Sen. 1: This parameter displays the current through the control module when the bank 1 sensor 1 HO2S heater is commanded ON by the control module. HO2S Heater Bn 1 Sen. 1 is a range of values indicating a low current when the heater circuit resistance is high to a high current when the heater circuit resistance is low.
HO2S Heater Bn 1 Sen. 2: This parameter displays the current through the control module when the bank 1 sensor 2 HO2S heater is commanded ON by the control module. HO2S Heater Bn 1 Sen. 2 is a range of values indicating a low current when the heater circuit resistance is high to a high current when the heater circuit resistance is low.
HO2S Heater Bn 2 Sen. 1: This parameter displays the current through the control module when the bank 2 sensor 1 HO2S heater is commanded ON by the control module. HO2S Heater Bn 2 Sen. 1 is a range of values indicating a low current when the heater circuit resistance is high to a high current when the heater circuit resistance is low.
HO2S Heater Bn 2 Sen. 2: This parameter displays the current through the control module when the bank 2 sensor 2 HO2S heater is commanded ON by the control module. HO2S Heater Bn 2 Sen. 2 is a range of values indicating a low current when the heater circuit resistance is high to a high current when the heater circuit resistance is low.
IAT Sensor: The scan tool displays a range of -39 to +140°C (-38 to +284°F). The powertrain control module (PCM) converts the resistance of the intake air temperature (IAT) sensor to degrees. The PCM uses the IAT in order to adjust fuel delivery and spark timing according to incoming air density.
Ignition 1 Signal: The scan tool displays 0-25.5 volts. The ignition 1 represents the system voltage measured by the powertrain control module (PCM) at the ignition feed circuit.
Inj. PWM Average Bank 1 and Bank 2: The scan tool displays a range of 0-1,000 milliseconds. The injector average indicates the amount of time the powertrain control module (PCM) commands each injector ON during each engine cycle. A longer injector pulse width causes more fuel to be delivered. The injector pulse width increases with an increased engine load.
Knock Retard: The scan tool displays a range of 0.0-16 degrees. Knock retard indicates the amount of spark the powertrain control module (PCM) removes from the ignition control (IC) spark advance in response to the signal from the knock sensors (KS).
Long Term FT Avg. Bn1 and Bn2: The scan tool displays percentage. This parameter indicates the average of all long term fuel trim cells. The short term fuel trim cells are rated, for the amount of which they are used. For example, an idle cell is rated higher than a wide open cell. If a fueling malfunction occurs in the idle cell and the wide open cell, the average would be more affected by the idle cell than the wide open cell. A negative value significantly below 0 percent indicates that the fuel system is rich and fuel delivery is being reduced. A positive value significantly more than 0 percent indicates that a lean condition exists and the powertrain control module (PCM) compensates by adding fuel. When the average of the cells reach a predetermined high or low, a fuel trim DTC sets.
Long Term FT Bank 1 and Bank 2: The scan tool displays percentage. The powertrain control module (PCM) derives the long term fuel trim from the short term fuel trim value. The long term fuel trim represents a long term correction of fuel delivery. A value of 0 percent indicates that fuel delivery requires no compensation in order to maintain the PCM commanded air/fuel ratio. A negative value significantly below 0 percent indicates that the fuel system is rich and the PCM is reducing the fuel delivery. A positive value significantly more than 0 percent indicates that a lean condition exists and the PCM compensates by adding fuel. Fuel trim values at maximum authority indicates an excessively rich or lean system.
Loop Status: The scan tool displays Open or Closed. Closed Loop indicates that the powertrain control module (PCM) is controlling fuel delivery according to oxygen sensor (HO2S) voltage. In Open Loop, the PCM ignores the HO2S voltage and bases the amount of fuel to be delivered on throttle position (TP) sensor, engine coolant, and mass air flow (MAF) sensor inputs only.
Low Oil Lamp Command: The scan tool displays ON or OFF. The scan tool displays On when the powertrain control module (PCM) detects that there is a low oil level condition. The low oil lamp is then commanded ON by the PCM.
MAF Sensor: The scan tool displays a range of 0-655 g/s. The mass air flow (MAF) is the MAF input frequency converted to grams of air per second. This indicates the amount of air entering the engine.
MAF Sensor: The scan tool displays a range of 0-31,999 Hz. The mass air flow (MAF) sensor is a hot wire type air flow sensor. The powertrain control module (PCM) converts current draw needed by the MAF to keep the hot wires at a constant into a frequency signal. The scan tool displays this frequency in a hertz signal.
MAP Sensor: Scan Tool Range 10-105 kPa/0-5 volts. The manifold absolute pressure (MAP) sensor measures the change in the intake manifold pressure from engine load, and speed changes. As intake manifold pressure increases, the intake vacuum decreases resulting in a higher MAP sensor voltage and kPa reading. The powertrain control module (PCM) uses the MAP sensor signal for updating the barometric pressure (BARO) reading and as an enabling factor for several of the diagnostics.
MIL Command: The scan tool displays On or Off. The scan tool indicates if the powertrain control module (PCM) has commanded the MIL ON.
Mileage Since DTC Cleared: The scan tool displays Kilometers or Miles. This parameter indicates the distance traveled since an emission DTC cleared. The powertrain control module (PCM) stores this information in the Freeze Frame/Failure Records memory.
Misfire Current Cyl. #1 - #8: The scan tool displays a range of 0-255 counts. The misfire current counters increment at a rate according to the number of possible misfires the powertrain control module (PCM) detects on each cylinder during the last 200 cylinder firing events. The counters may normally display some activity, but the activity should be nearly equal for all the cylinders.
Misfire History Cyl. #1 - #8: The scan tool displays a range of 0-65,535 counts. The misfire history counters display the total level of misfire that has been detected on each cylinder. The misfire history counters will not update or show any activity until a misfire DTC P0300 has become active. The misfire history counters will update every 200 cylinder firing events.
PCM Reset: The scan tool displays Yes or No. This parameter indicates when the internal powertrain control module (PCM) resets. The scan tool displays YES when an internal PCM reset occurred. The scan tool displays NO under the normal operating conditions.
PCM/VCM in VTD Fail Enable: The powertrain control module (PCM) displays Yes or No. The scan tool displays Yes if the body control module (BCM) and the PCM lose communications with each other after the BCM sends the correct password. The scan tool displays No if the BCM is communicating the correct password to the PCM.
PNP Switch: The scan tool displays Park/Neutral / In Gear. This parameter indicates the range selection of automatic transmission equipped vehicles. The parameter will display Park/Neutral for the Park or Neutral position of the gear selector. The parameter will display In Gear for the Reverse, Drive, or Low positions of the gear selector.
Power Enrichment: The scan tool displays YES or NO. Yes indicates that the powertrain control module (PCM) has detected conditions appropriate to operate in Power Enrichment mode. The PCM will command Power Enrichment mode when a large increase in throttle position and load is detected. While in Power Enrichment, the PCM will increase the amount of fuel delivered by entering Open Loop and increasing the injector pulse width. This is done to prevent a possible sag or hesitation from occurring during acceleration.
Power Take Off (PTO) Enable: The scan tool displays YES or NO. Yes indicates that the power take off (PTO) has been engaged and No indicates that the PTO has been disengaged.
Reduced Engine Power: The scan tool displays Active or Inactive. The scan tool displays Active when the powertrain control module (PCM) receives a signal from the throttle actuator control (TAC) module that a TAC system fault is occurring. The PCM limits the engine power.
Short Term FT Avg. Bn1 and Bn2: The scan tool displays percentage. This parameter indicates the average of the short term fuel trim cells. The short term fuel trim cells are rated for the amount of which they are used. For example, the powertrain control module (PCM) rates an idle cell higher than a wide open cell. If a fueling malfunction occurs in the idle cell and the wide open cell, the idle cell would affect more than the wide open cell. A negative value significantly below 0 percent indicates that the fuel system is rich and the PCM is reducing the fuel delivery. A positive value significantly more than 0 percent indicates that a lean condition exists and the PCM is compensating by adding fuel. When the average of the cells reach a predetermined high or low, a fuel trim DTC sets.
Short Term FT Bank 1 and Bank 2: The scan tool displays percentage. The short term fuel trim represents a short term correction to fuel delivery by the powertrain control module (PCM) in response to the amount of time the fuel control oxygen sensor voltage spends above or below the 450 mV threshold. If the O2S voltage mainly remains less than 450 mV, indicating a lean air/fuel mixture, short term fuel trim increases into the positive range above 0 percent. The PCM adds fuel. If the O2S voltage stays mainly above the threshold, the short term fuel trim decreases below 0 percent into the negative range. The PCM reduces the fuel delivery in order to compensate for the indicated rich condition. Under certain conditions such as an extended idle and a high ambient temperature, the canister purge may cause the short term fuel trim to read in the negative range during normal operation. The fuel trim values at maximum authority may indicate an excessively rich or lean system.
Spark: The scan tool displays a range of -64 to +64 degrees. The scan tool displays the amount of degrees the powertrain control module (PCM) commands the spark advance on the ignition control (IC) circuit. The PCM computes the desired spark advance using the following: (1) ECT, (2) Engine speed (RPM), (3) Load, (4) Vehicle speed. The PCM adjusts the timing.
Start Up ECT: The scan tool displays a range of -39 to +140°C (-38 to +284°F). The scan tool displays the engine coolant temperature (ECT) at the time the engine was started. The powertrain control module (PCM) uses start-up ECT for certain DTCs.
Stop Lamp Pedal Switch: The scan tool displays Applied or Released. This parameter indicates the state of the brake switch circuit input. The scan tool displays Applied when you apply the vehicle brakes. The scan tool displays Released when you release the vehicle brakes.
TAC/PCM Communication Signal: The scan tool displays OK or Fault. If the communication between the throttle actuator control (TAC) module and the powertrain control module (PCM) is interrupted the scan tool displays Fault. The scan tool displays OK under the normal operating conditions.
TCC Brake Pedal Switch: The scan tool displays Applied or Released. This parameter indicates the state of the (TCC/CC) brake switch circuit input. Open indicates 0 voltage input, brake switch open, brake pedal applied. Closed indicates a B+ voltage input, brake switch closed, brake pedal released. When you apply the vehicle brakes, the scan tool displays Applied. The TCC and cruise control disengages. When you release the vehicle brakes, the scan tool displays Released. This allows the cruise control to be resumed and the torque converter clutch to engage.
TCC Enable Solenoid Command: The scan tool displays Enabled or Disabled. The scan tool displays Enabled when the electrical system supplies a voltage to the TCC enable solenoid.
TCC PWM Solenoid Command: The scan tool displays 0-100 percent. This parameter is the commanded state of the torque converter clutch (TCC) pulse width modulated (PWM) solenoid. The scan tool displays 100 percent when the commanded state of the solenoid is ON. The scan tool displays 0 percent when the solenoid is OFF.
TFP Sw.: The scan tool displays Park/Neutral, Reverse, Drive 4, Drive 3, Drive 2, or Low. Trans range represents the decoded status of the four inputs from the transmission internal mode switch assembly. The combination of the transmission inputs indicates the position of the transmission manual valve.
TP Desired Angle: The scan tool displays 0-100 percent. The powertrain control module (PCM) indicates the desired throttle angle commanded by the vehicle operator.
TP Indicated Angle: The scan tool displays 0-100 percent. The TP indicated angle displays in percentage the amount of throttle opening.
TP Sensor 1: The scan tool displays 0-100 percent. The scan tool displays the amount of throttle opening in percentage. Closed throttle displays 0 percent and wide open throttle (WOT) displays near 100 percent.
TP Sensor 1: The scan tool displays 0-5 volts. The scan tool displays the amount of throttle opening in volts. Closed throttle displays about 1 volt and wide open throttle (WOT) displays above 3.5 volts.
TP Sensor 2: The scan tool displays 0-100 percent. The scan tool displays the amount of throttle opening in percentage. Closed throttle displays 0 percent and wide open throttle (WOT) displays near 100 percent.
TP Sensor 2: The scan tool displays 5-0 volts. The scan tool displays the amount of throttle opening in volts. Closed throttle displays about 4 volts and wide open throttle (WOT) displays below 1.5 volts.
TP Sensors 1 and 2: The scan tool displays Agree or Disagree. When the throttle actuator control (TAC) module receives a signal voltage from one of the throttle position sensors not in proper relationship to the other, the scan tool displays Disagree. The scan tool displays No under normal operating conditions.
TR Switch: The scan tool displays the transmission gear position.
Vehicle Speed Sensor: The scan tool displays km/h and mph. The vehicle speed sensor (VSS) signal is converted into km/h and mph for display on the scan tool.
VTD Auto Learn Timer: The scan tool displays Active/Inactive. The auto learn timer is the indication if the vehicle theft deterrent (VTD) system is in the learn mode and has not timed out.
VTD Fuel Disabled: The scan tool displays Active/Inactive. If the powertrain control module (PCM) has not received the correct password from the body control module (BCM), the PCM disables the fuel system and the scan tool displays Active. The scan tool displays Inactive under normal operating conditions.
VTD Fuel Disable Until Ignition Off: The scan tool displays Yes or No. With the ignition ON and a vehicle theft deterrent (VTD) code present, the scan tool displays Yes.
Warm Ups w/o Emission Faults: The scan tool displays a range of 0-255. This parameter counts the number of warm up cycles without an emission fault present. The counter increments to 255 and rolls back to 0 unless a fault occurs. If a fault occurs, the counter reverts back to 0 until the fault is corrected. Clearing the information with a scan tool or a loss of power to the powertrain control module (PCM) also resets the counter to 0.
Warm Ups w/o Non - Emission Faults: The scan tool displays a range of 0-255. This parameter counts the number of warm up cycles without a non-emission fault present. The counter increments to 255 and rolls back to 0 unless a fault occurs. If a fault occurs, the counter reverts back to 0 until the fault is corrected. Clearing information with a scan tool or a loss of power to the powertrain control module (PCM) also resets the counter to 0.