EGR Data

DESIRED EGR POS. - Scan Tool Range 0%-100%
Represents the EGR pintle position that the PCM is commanding. Desired EGR Pos. should stay close to Actual EGR Pos.

ACTUAL EGR POS - Scan Tool Range 0%-100%
Represents the actual position of the EGR pintle in percent. 0% displayed indicates a fully extended pintle (EGR valve closed).

EGR TEST COUNT - Scan Tool Range 0-255
Indicates the number of EGR flow test samples collected during the current ignition cycle. The maximum number of samples allowed is 1 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 ignition cycle. This is to allow repair verification during a single ignition cycle.

EGR FEEDBACK - Scan Tool Range 0.00-5.00 Volts
Indicates the EGR pintle position sensor signal voltage being monitored by the PCM. A low voltage indicates a fully extended pintle (closed valve); A voltage near 5 volts indicates a retracted pintle (open valve).

EGR DUTY CYCLE - Scan Tool Range 0%-100%
Represents the EGR valve driver PWM signal from the PCM. A duty cycle of 0 percent indicates that no EGR flow is being commanded; a 100 percent duty cycle indicates maximum EGR flow commanded.

EGR POS. ERROR - Scan Tool Range 0%-100%
Indicates the difference between Desired EGR Position and Actual EGR Position currently being monitored by the PCM. If the EGR Position Error is reaches an unacceptable level, DTC P1406 will set.

EGR CLOSED VALVE PINTLE POSITION - Scan Tool Range 0.0-5.0 Volts
Represents the learned voltage that the PCM uses to determine whether or not the EGR valve is fully closed (0 percent pintle position). If a difference of more than 0.4 volt between EGR Feedback and EGR Closed Valve Pintle Position is detected, DTC P1406 will set.

ENGINE SPEED - Scan Tool Range 0-9999 RPM
Engine speed is computed by the PCM from the 3X reference input. It should remain close to desired idle under various engine loads with engine idling.

DESIRED IDLE - Scan Tool Range 0-3187 RPM
The idle speed that is commanded by the PCM. The PCM will compensate for various engine loads based on engine coolant temperature to keep the engine at the desired speed.

ECT - Scan Tool Range -40°C to 151°C, (-40°F to 304°F)
The Engine Coolant Temperature (ECT) sensor is mounted in the coolant stream and sends engine temperature information to the PCM. The PCM applies 5 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the PCM monitors a high signal voltage and interprets it as a cold engine. As the sensor warms (internal resistance decreases), the voltage signal will decrease and the PCM will interpret the lower voltage as a warm engine.

IAT - Scan Tool Range -40°C to 151°C, (-40°F to 304°F)
The PCM converts the resistance of the intake air temperature sensor to degrees. Intake Air Temperature (IAT) is used by the PCM to adjust fuel delivery and spark timing according to incoming air density.

IAC POSITION - Scan Tool Range 0-255
Displays the commanded position of the idle air control pintle in counts. A larger number of counts means that more air is being commanded through the idle air passage. Idle air control should respond fairly quickly to changes in engine load to maintain desired idle RPM.

TP ANGLE - Scan Tool Range 0- 100%
Throttle Position (TP) Angle is computed by the PCM from the TP sensor voltage. TP Angle should display 0% at idle and 100% at wide open throttle.

BARO - Scan Tool Range 10-1 OS kPa/0.00-5.00 Volts
The Barometric Pressure reading is determined from the MAP sensor signal monitored during key up and Wide Open Throttle (WOT) conditions. The Barometric Pressure is used to compensate for altitude differences.

MAP - Scan Tool Range 10-1 OS kPa/0.00-4.97 Volts
The Manifold Absolute Pressure (MAP) sensor measures the change in the intake manifold pressure from engine load, EGR flow, and speed changes. As intake manifold pressure increases, intake vacuum decreases resulting in a higher MAP sensor voltage and kPa reading. The MAP sensor signal is used to monitor intake manifold pressure changes during the EGR flow test, to update the BARO reading, and as an enabling factor for several of the diagnostics.

LOOP STATUS - Scan Tool Displays OPEN or CLOSED
"Closed Loop" indicates that the PCM is controlling fuel delivery according to oxygen sensor voltage. In "Open Loop," the PCM ignores the oxygen sensor voltage and bases the amount of fuel to be delivered on TP sensor, engine coolant, and MAF sensor inputs only.

FUEL TRIM LEARN - Scan Tool Displays NO or YES
When conditions are appropriate for enabling long term fuel trim corrections, FUEL TRIM LEARN will display yes. This indicates that the long term fuel trim is responding to the short term fuel trim. If the Fuel Trim Learn displays "NO" then long term fuel trim will not respond to changes in short term fuel trim.

RICH/LEAN BN1 and BN2 - Scan Tool Displays RICH or LEAN
Indicates whether oxygen sensor voltage is above a 600 mV threshold voltage (rich) or below a 300 mV threshold voltage (lean). Should change constantly while in closed loop, indicating that the PCM is controlling the air/fuel mixture properly.

ENGINE LOAD - Scan Tool Range 0%-100%
Engine load is calculated by the PCM from engine speed and MAF sensor readings. Engine Load should increase with an increase in RPM or airflow.

HOT OPEN LOOP - Scan Tool Displays ACTIVE or INACTIVE
ACTIVE displayed indicates that the PCM has detected conditions appropriate to operate in Hot Open Loop mode. The PCM determines this based on Engine Coolant Temperature, Mass Air Flow and Vehicle Speed. While in Hot Open

IGNITION 1 - Scan Tool Range 0-25.5 Volts
This represents the system voltage measured by the PCM at its ignition feed (CKT 439).

KNOCK RETARD - Scan Toot Range 0.0-25.5
Indicates the amount of spark the PCM is removing from IC spark advance in response to the signal from the Knock sensors.

KS ACTIVITY - Scan Tool Displays YES or NO
"YES" displayed indicates that knock is being detected.

CURRENT GEAR - Scan Tool Displays 1, 2, 3, or 4
The PCM looks at Trans Range position and the gear commanded by the PCM. The actual forward gear that the transmission is in will be the lower of the two because the manual valve can override the PCM commanded gear.

TRANS RANGE - Scan Tool Displays INVALID, PARK/NEUTRAL, REVERSE, DRIVE 4, DRIVE 3, DRIVE 2, or LOW
Trans Range represents the decoded status of the three transmission range pressure switch inputs from the Transmission Range Pressure Switch Assembly. The combination of transmission range inputs indicates the position of the transmission manual valve.

COMMANDED TCC - Scan Tool Displays ENGAGED or DISENGAGED
Represents the PCM commanded state of the transmission torque converter clutch.

TRANS. HOT MODE - Scan Tool Displays ACTIVE or INACTIVE
ACTIVE displayed indicates that the PCM has detected conditions appropriate for transmission hot mode operation. The PCM determines this based on transmission fluid temperature. While in Hot Mode, transmission shift points may be altered, 4th gear disabled, and the Torque Converter Clutch (TCC) forced "ON" in 2nd gear.

TWC PROTECTION - Scan Tool Displays ACTIVE or INACTIVE
ACTIVE displayed indicates that the PCM has detected conditions appropriate to operate in Three Way Catalyst (TWC) Protection mode. This is determined based on Engine Load and Engine Coolant Temperature. While in TWC Protection, the PCM will decrease Air/Fuel Ratio to a value that depends on Mass Air Flow (higher Mass Airflow = lower Air/Fuel Ratio).

DECEL FUEL MODE - Scan Tool Displays ACTIVE or INACTIVE
ACTIVE displayed indicates that the PCM has detected conditions appropriate to operate in Deceleration Fuel mode. The PCM will command deceleration fuel mode when a sudden decrease in throttle position has been detected while the vehicle is traveling over 20 mph. While in Deceleration Fuel mode, the PCM will decrease the amount of fuel delivered by entering Open Loop and decreasing the injector pulse width.

POWER ENRICHMENT - Scan Tool Displays ACTIVE or INACTIVE
ACTIVE displayed indicates that the 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.