Normal Scan Data Values
ACCSThis value indicates the position of the Air Conditioning Cycle Switch (ACCS). This signal does not imply the condition of the AC clutch.
Range ON/OFF
AIR
This represents the state of the Secondary Air Injection (AIR) system.
Range Upstream / Downstream / Bypass
BOO
This represents the state of the Brake On/Off (BOO) switch. With the pedal depressed the switch is "ON".
Range ON/OFF
DPFE
This value represents the exhaust backpressure input signal to the PCM from the Differential Pressure Feedback EGR (DPFE) sensor. The PCM uses this signal to determine the correct EGR flow.
Normal Operating Range 0-5 volts
ECT (V)
This represents the input voltage received by the PCM from the Engine Coolant Temperature (ECT) sensor. ECT values range from 3.5 v at 50 degrees F to 0.2 v at 248 degrees F.
Range 0-5 volts
ECT (C/F)
Value calculated by the PCM from the ECT sensor input. This value may be in either Celsius (C) or Fahrenheit (F).
Range 10-120 C (50-248 F)
EVR %
This value represents the duty cycle output signal from the PCM to the EGR Vacuum Regulator (EVR). As the percent duty cycle is increased the amount of vacuum supplied to the ERG valve is also increased.
Range 0-100 %
EVP (V)
This represents the input signal received by the PCM from the EGR Valve Position (EVP) sensor. This value ranges from 0.24 v (valve closed) to 4.81 v (valve fully open)
Normal Operating Range 0.24 - 4.81 volts
FP
Indicates the status of the Fuel Pump (FP) relay. "ON" implies the relay is shut while "OFF" implies the relay is open.
Range ON/OFF
H02S
This represents the input signal received by the PCM from the Heated Oxygen Sensor (HO2S). This signal should toggle above and below 0.45 volts and should never be negative.
Normal Operating Range 0-1 volt
IAC %
This value represents the duty cycle signal sent to the Idle Air Control (IAC) solenoid. Idle speed is controlled by the amount of air flow through the IAC valve. Higher IAC% values result in more airflow and higher idle speeds while lower IAC% values result in less air flow and lower idle speeds.
Range 0-100 %
IAT (V)
This represents the input voltage received by the PCM form the Intake Air Temperature (IAT) sensor. IAT values range from 3.5 v at 50 degrees F to 0.2 v at 248 degrees F.
Range 0-5 volts
IAT (C/F)
Value calculated by the PCM from the IAT sensor input. This value may be in either Celsius (C) or Fahrenheit (F).
Range 10-120 C (50-248 F)
INJ PW
Fuel Injection Pulsewidth (INJ PW) represents the amount of time, in Milliseconds (ms) each injector is pulsed on. The amount of fuel injected is directly proportional to length of INJ PW, a longer INJ PW results in more fuel being injected while a shorter INJ PW results in less fuel being injected.
Range 0-100 ms
LF TRIM %
LF fuel trim represents the long term correction factor being applied to the the fuel injection pulsewidth. The LF trim the previous history of SF trim values. The LF trim is adjusted to attempt to maintain the SF trim at 0%
Positive (+) LF trim implies the PCM is correcting for a lean condition by adding extra fuel. Negative (-) LF trim implies the PCM is correcting for a rich condition by reducing fuel.
Range -100% to +100%
LOAD %
This parameter is internally calculated by the PCM by comparing the engine size, RPM, and total airflow through the engine.
Range 0-100%
LOOP STATUS
This indicates whether the Powertrain Control Module (PCM) is operating in open or closed loop.
Range OPEN/CLOSED
MAP
A frequency input signal the PCM receives from the Manifold Absolute Pressure (MAP) sensor. The MAP signal ranges from 80 hertz at 30 in Hg to 159 hertz at 0 in Hg.
Range 80-159 hertz
OCT ADJ
This indicates whether the Octane Adjust (OCT ADJ) shorting bar is in place. Removing the OCT ADJ shorting bar will indicate "ON" and retard ignition timing by 3 degrees.
Range ON/OFF
PFE
This value represents the exhaust backpressure input signal to the PCM from the Pressure Feedback EGR (PFE) sensor. The PCM uses this signal to determine the correct EGR flow.
Normal Operating Range 0-5 volts
P/S PRESS
Indicates the state of the power steering pressure switch. "ON" implies the switch is closed and a load has been applied to the power steering system.
Range ON/OFF
RPM
Engine speed calculated by the PCM from the Ignition Diagnostic Monitor (IDM) signal.
Range 0-9999 rpm
SF TRIM
SF fuel trim represents the short term correction factor the PCM is using to correct for the immediate fuel condition. The SF fuel trim changes in direct response to the signal received from the oxygen sensor.
Range -100% to +100%
SPARK ADV
This represents the total spark advance requested by the PCM (includes base timing).
Range -99 to +99 degrees
TP (V)
Actual input voltage received by the PCM from the the Throttle Position (TP) sensor. TP voltage ranges from 0.6 v at 0% throttle opening to 4.6 v at 85 % throttle opening.
Range 0-5 volts
TP %
A calculated value based on the input voltage received by the PCM from the TP sensor.
Range 0-100 %
TP MODE
This parameter is calculated by the PCM from the TP sensor input and indicates the current operating condition. These conditions are Closed Throttle (CT), Part Throttle (PT), and Wide Open Throttle (WOT).
Range CT / PT / WOT
TPCT
The Throttle Position Closed Throttle (TPCT) indicates the last closed throttle voltage input recorded by the PCM.
Range 0-5 volts
TFT
This represents the input signal received by the PCM from the Transmission Fluid Temperature (TFT) sensor. This value varies indirectly with transmission fluid temperature. High temperatures result in lower voltages while low temperatures result in higher voltages.
Normal Operating Range 0.6 - 4.9 volts
VEH SPEED
This value is derived from the input signal the PCM receives from the Vehicle Speed Sensor (VSS).
Range vehicle speed in mph
VPWR
Voltage sensed by the PCM at its battery power supply input. Normal operating range is 13.5-14.5 volts.
Range 0-25 volts
VREF
This value represents the Reference Voltage (VREF) supplied by the PCM to input sensors. VREF should be 5.0v (±1.0v).
Normal Operating Range 4-6 volts
WAC
The Wide Open Throttle A/C Cutout (WAC) value indicates that the PCM is disengaging the AC clutch due to current operating conditions.
Range ON/OFF