| Table 1: | Scan Tool Data - Engine 1 Data |
| Table 2: | Scan Tool Data - Engine 2 Data |
| Table 3: | Scan Tool Data - Specific Eng., Misfire Data |
| Table 4: | Scan Tool Data - Specific Eng. O2S Data |
| Table 5: | Scan Tool Data - DTC Freeze Frame Data |
| Table 6: | Scan Tool Data - Specific Eng. EGR/EVAP |
The following information will assist in diagnosing emission or driveability problems. The technician can view the displays while the vehicle is being driven. Refer to Powertrain On Board Diagnostic (OBD) System Check for additional information.
The data messages displayed on the scan tool are divided into Engine, Specific Engine, and DTC lists as follows:
Engine Data
| • | Engine 1 - Contains general information regarding the fuel delivery, the Ignition Control (IC), the Knock Sensor (KS), and the basic engine operating conditions. |
| • | Engine 2 - Contains general information regarding the fuel delivery Output Controls, the Ignition Control (IC), the Air Conditioning (A/C), the cruise control, and the basic engine operating conditions. |
Specific Engine Data
| • | EGR - Contains the information specific to the Exhaust Gas Recirculation System (EGR) and the Evaporative Emissions System (EVAP) required for diagnosis. |
| • | Misfire - Contains the information specific to the diagnosis of the misfire and the data required to verify the proper operation with regard to the misfire. |
| • | O2S - Contains information specific to the Oxygen Sensor (O2S 1) and the Rear Heated Oxygen Sensor (HO2S 2) diagnosis and the data required to verify the proper operation of the sensors. |
DTC Data
| • | Freeze Frame - Contains Information collected at the time a type A or a type B DTC MIL illuminates. This allows the technician to re-create the conditions when a MIL occured and to verify the proper operation within these conditions. |
| • | Failure Records - Contains the information at the time a diagnostic test failed and set a DTC. The failure records data is not necessarily associated with the MIL |
Idle/Upper Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Acc.OFF | ||
|---|---|---|
Scan Tool Parameter | Units Displayed | Typical Data Value |
Engine Speed | RPM | ±100 RPM from the desired RPM |
Desired Idle Speed | RPM | PCM idle command (varies with calibration) |
ECT | C-F | 85°-115° C (varies with the coolant temperature) |
IAT | C-F | 10°-115° C (varies with under hood temperature) |
MAP | kPa, V | 1-3 volts (varies with the vacuum and the BARO pressure |
BARO | kPa | 3-5 volts (varies with the vacuum and the BARO pressure |
TP Sensor | Volts | 0.200-0.900 V (up to 5.0 at wide open throttle) |
TP Angle | % | 0 % (up to 100% at wide open throttle) |
O2S 1 | mV | 1-100 and varying |
HO2S Sensor 2 | mV | 1-100 and varying |
Fuel Trim Cell | Cell Number | 18-21 at idle (varies with the air flow, RPM, P/N, and A/C) |
Fuel Trim Index | Counts, % | 58-198 (varies) |
Short Term FT | Counts, % | 58-198 (varies) |
Long Term FT | Counts, % | 58-198 (varies) |
Short Term FT Average | Counts, % | 58-198 (varies) |
Long Term FT Average | Counts, % | 58-198 (varies) |
Low Octane Fuel Spark Modifier | Degrees | Varies with fuel |
Spark | Degrees | Varies |
Knock Retard | Degrees | 0 |
KS Noise Channel | Volts | No |
KS Active Counter | Yes/No | 35-50 |
Med. Resolution Resync Counter | 0-255 Counts | 0 |
CKP Act. Counter | 0-255 Counts | 0-255 |
CMP Act. Counter | 0-255 Counts | 0-255 |
Med. Resolution Engine Sync | Yes/No | No |
CMP Resync Counter | 0-255 Counts | 0 |
Purge Lrn. Mem. | Counts | 0 |
EVAP Canister Purge | % | 0-100 % |
IAC Position | Counts | 5-60 |
Transmission Range | Valid/Invalid | Valid |
Loop Status | Open/Closed | Closed |
TCC Brake Switch | Closed/Open | Closed |
Power Enrichment | Active/Inactive | Inactive at idle |
Calc. Air Flow | g/s | varies |
Engine Load | % | varies |
Engine Speed | RPM | ±100 RPM from the desired RPM |
Vehicle Speed | km/h | Varies with the vehicle speed |
Ignition 1 | Volts | 12.0-15.0 V |
Engine Run Time | Seconds | Varies (since start up) |
Number of Current DTCs | # | 0 |
Idle/Upper Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Acc.OFF | ||
|---|---|---|
Scan Tool Parameter | Units Displayed | Typical Data Value |
Engine Speed | RPM | ±100 RPM from the desired RPM |
Desired Idle Speed | RPM | PCM idle command (varies with calibration) |
ECT | °C-°F | 85°-115° C (185°-239° F)(varies with the coolant temperature) |
IAT | °C-°F | 10°-80° C (50°-176° F)(varies with under hood temperature) |
MAP | kPa, V | 1-3 volts (varies with the vacuum and the BARO pressure |
BARO | kPa | 3-5 volts (varies with the vacuum and the BARO pressure |
TP Sensor | Volts | 0.200-0.900 V (up to 5.0 at wide open throttle) |
TP Angle | % | 0 % (up to 100% at wide open throttle) |
Total Misfire Current Count | 0-255 Counts | 0 (increases with misfires) |
Air Fuel Ratio | Ratio | 14.7:1 |
Base PWM Cyl. 1 | mS | 1-4 varies |
Base PWM Cyl. 2 | mS | 1-4 varies |
Base PWM Cyl. 3 | mS | 1-4 varies |
Base PWM Cyl. 4 | mS | 1-4 varies |
A/C Request | Yes/No | No |
A/C Relay | Off/On | Off (On with the A/C request) |
A/C Highside Pressure | Volts/kPa | 0-5.0 Volts/0-450 PSI (varies with the refrigerant pressure) |
Stepper Cruise Motor | Enabled/Disabled | Disabled |
Cruise | Engaged/Disengaged | Disengaged |
Output Driver 1 Shorted | 00000000 | 00000000 (A 1 appears with a short to voltage) |
Output Driver 1 Open | 00000000 | 00000000 (A 1 appears with a short to ground or open) |
Output Driver 2 Shorted | 00000000 | 00000000 (A 1 appears with a short to voltage) |
Output Driver 2 Open | 00000000 | 00000000 (A 1 appears with a short to ground or open) |
TR Switch (A) | Low/High | Low (Auto trans only) (Park only) |
TR Switch (B) | Low/High | Low (Auto trans only) (Park only) |
TR Switch (C) | Low/High | High (Auto trans only) (Park only) |
TR Switch (P) | Low/High | High (Auto trans only) (Park only) |
Trans. Range | Invalid/Low/Drive 2/Drive 3/Overdrive/Reverse/Park/Neutral | Park/Neutral (Auto trans only) |
Vehicle Speed | km/h | 0 |
Number of Current DTCs | Number | 0 |
Engine Run Time | seconds | varies from engine start up time |
Idle/Upper Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Acc. OFF | ||
|---|---|---|
Scan Tool Parameter | Units Displayed | Typical Data Value |
Engine Speed | RPM | ±100 RPM from the desired RPM |
Desired Idle Speed | RPM | PCM idle command (varies with calibration) |
ECT | °C-°F | 85°-115° C (185°-239° F)(varies with the coolant temperature) |
IAT | °C-°F | 10°-115° C (50°-176° F) (varies with under hood temperature) |
MAP | kPa, V | 1-3 volts (varies with the vacuum and the BARO pressure |
BARO | kPa | 3-5 volts (varies with the vacuum and the BARO pressure |
TP Sensor | Volts | 0.200-0.900 V (up to 5.0 at wide open throttle) |
TP Angle | % | 0 % (up to 100% at wide open throttle) |
Misfire Cur. #1 | 0-255 Counts | 0 (increases with misfire) |
Misfire Hist. #1 | 0-255 Counts | 0 (increases with misfire) |
Misfire Cur. #2 | 0-255 Counts | 0 (increases with misfire) |
Misfire Hist. #2 | 0-255 Counts | 0 (increases with misfire) |
Misfire Cur. #3 | 0-255 Counts | 0 (increases with misfire) |
Misfire Hist. #3 | 0-255 Counts | 0 (increases with misfire) |
Misfire Cur. #4 | 0-255 Counts | 0 (increases with misfire) |
Misfire Hist. #4 | 0-255 Counts | 0 (increases with misfire) |
Base PWM Cyl. 1 | mS | 1-4 (varies) |
Base PWM Cyl. 2 | mS | 1-4 (varies) |
Base PWM Cyl. 3 | mS | 1-4 (varies) |
Base PWM Cyl. 4 | mS | 1-4 (varies) |
Calc. Air Flow | g/s | Varies |
Engine Load | % | Varies |
Number of Current DTCs | DTC Number | 0 |
Engine Run Time | Seconds | Varies (since start up) |
Idle/Upper Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Acc.OFF | ||
|---|---|---|
Scan Tool Parameter | Units Displayed | Typical Data Value |
O2S 1 | mV | 1-1000 and varying |
HO2S Sensor 2 | mV | 1-1000 and varying |
Engine Speed | RPM | ±100 RPM from the desired RPM |
Desired Idle Speed | RPM | PCM idle Command (varies with calibration) |
ECT | °C-°F | 85° C-115° C (varies with the coolant temperature |
IAT | °C-°F | 10° C-80° C (varies with the underhood temperature |
MAP | kPa, V | 1-3 volts (varies with the vacuum and the BARO pressure) |
BARO | kPa | 3-5 volts (varies with the altitude and the BARO pressure) |
TP Sensor | Volts | 0.200-0.900 V (up to 5.0 at wide open throttle) |
TP Angle | % | 0% (up to 100% at wide open throttle |
Short Term FT | Counts, % | 58-198 (Varies) |
Fuel Trim Cell | Cell # | 18-21 at idle |
Fuel Trim Index | Counts | varies |
Short Term FT Average | Counts, % | 58-198 (Varies) |
Long Term FT | Counts, % | 58-198 (Varies) |
Long Term FT Average | Counts, % | 58-198 (Varies) |
Lean/Rich Transition | Counts | 0 |
Rich/Lean Transition | Counts | 0 |
Lean/Rich Average | mS | 0 |
Rich/Lean Average | mS | 0 |
Lean/Rich to Rich/Lean Ratio Bn 1 Sen. 1 | Ratio | Varies |
Loop Status | Open/Closed | Closed |
Number of Current DTCs | DTC Number | 0 |
Engine Run Time | Seconds | Varies (since start up) |
Idle/Upper Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Acc.OFF | ||
|---|---|---|
Scan Tool Parameter | Units Displayed | Typical Data Value |
DTC Freeze Frame | # | DTC # |
Air/Fuel Ratio | Ratio | 14.7:1 |
Calc. Air Flow | gm/S | Varies |
ECT | °C-°F | 85°-115° C (varies with the coolant temp.) |
BARO | kPa | 3-5 volts (varies with the altitude and the BARO pressure |
MAP | kPa, V | 1-3 volts (varies with the vacuum and the BARO pressure) |
Short Term FT | Counts, % | 58-198 (varies) |
Long Term FT | Counts, % | 58-198 (varies) |
Loop Status | Open/Closed | Closed |
MPH | MPH and km/h | 0 |
Load | % | varies |
TP Angle | % | 0 % (up to 100% at wide open throttle) |
Engine Speed | RPM | ±100 from the desired RPM |
Idle/Upper Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Acc.OFF | ||
|---|---|---|
Scan Tool Parameter | Units Displayed | Typical Data Value |
Engine Speed | RPM | ±200 RPM from the desired RPM |
Desired Idle Speed | RPM | PCM idle command (varies with the calibration) |
ECT | °C-°F | 85°-115° C (varies with the coolant temperature) |
IAT | °C-°F | 10°-80° C (varies with the underhood temperature) |
MAP | kPa, V | 1-3 volts (varies with the vacuum and the BARO pressure |
BARO | kPa | 3-5 volts (varies with the vacuum and the BARO pressure) |
TP Sensor | volts | 0.200-0.900 V (up to 5.0 at wide open throttle) |
TP Angle | % | 0 % (up to 100 % at wide open throttle) |
O2S 1 | mV | 1-1000 and varying |
HO2S Sensor 2 | mV | 1-1000 and varying |
IAC Position | Counts | 5-60 counts |
Fuel Trim Cell | Cell number | 18-21 at idle (varies with the air flow, RPM, P/N, an A/C) |
Short Term FT | Counts, % | 58-198 (varies) -100 % to 100 % (varies) |
Long Term FT | Counts, % | 58-198 (varies) -100 % to 100 % (varies) |
EGR Delta MAP Calc. | kPa | 0 or a negative number |
Decel EWMA | kPa | -3 or-4 |
Desired EGR Pos. | % | 0 % |
Actual EGR Pos. | % | 0 % |
EGR Flow Test Counter | Counts | 1-15 |
EVAP Canister Purge | % | varies |
EVAP Vent Sol. | Open/Closed | Open |
Fuel Level Sensor | Volts, % | Varies With The Fuel Level |
Fuel Tank Pressure | Volts/inches of H2O/sec. | varies |
Engine Run Time | Seconds | Varies |
# of current DTCs | # | 0 |
