Use the Typical Scan Data Values table only after the Powertrain On-Board Diagnostic System Check has been completed, no DTCs were noted and you have determined the on-board diagnostics are functioning properly. Scan tool values from a properly running engine may be used for comparison with the engine you are diagnosing. The Typical Scan Data values represent values that would be seen on a normally running engine.
Important:: A scan tool that displays faulty data should not be used, and the problem should be reported to the scan tool manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.
Only the parameters listed below are referred to in this service manual for use in diagnosis. For further information on using the scan tool to diagnose the PCM and related sensors, refer to the applicable reference section listed below. If all values are within the typical range described below, refer to Symptoms section for diagnosis. The Typical Scan Data Values table contains all the parameters included in the following data lists arranged in alphabetical order:
Engine Data
| • | ENG 1- Contains general information regarding fuel delivery and basic engine operating conditions. |
| • | ENG 2 - Contains general information regarding IC, KS, A/C, and basic engine operating conditions. |
Specific Engine Data
| • | CATALYST - Contains information specific to the TWC diagnostics and parameters required to verify proper TWC system operation. |
| • | EGR - Contains information specific to the Exhaust Gas Recirculation system flow diagnostics and the EGR valve pintle position sensor diagnostics. Also displays parameters required to verify proper EGR system operation. |
| • | EVAP - Contains information specific to the EVAP system diagnostics. Also displays parameters required to verify proper EVAP system operation. |
| • | HO2S - Contains information specific to the Heated Oxygen Sensor diagnostics and parameters required to verify proper HO2S operation. |
| • | MISFIRE - Contains information specific to the misfire diagnostics and parameters required to verify proper operation with regard to misfire. |
Typical Scan Tool Data Values
Scan Tool Parameter | Data List | Units Displayed | Typical Data Value | Reference |
|---|---|---|---|---|
3X Crank Sensor | Misfire | RPM | Varies | DTC P1374 3X Reference Circuit |
18X Crank Sensor | Misfire | RPM | Varies | Cranks But Does Not Run Diagnostic |
A/C High Side Pressure | Engine 2 | Volts | Varies with refrigerant temperature | PCM Controlled Air Conditioning |
A/C Pressure Out Of Range | Engine 2 | Yes / No | No (Yes with low or high A/C refrigerant pressure) | PCM Controlled Air Conditioning |
A/C Request | Catalyst Engine 2 Misfire | Yes / No | No (Yes with A/C ON) | PCM Controlled Air Conditioning |
Actual EGR Position | Engine 1 Engine 2 EGR Misfire | Percent | 0% | DTC P1406 EGR Valve Pintle Position Circuit |
Air/Fuel Ratio | Engine 1 HO2S Catalyst | Ratio | 14.2:1 - 14.7:1 | Fuel Metering Modes of Operation |
BARO | Engine 1 Engine 2 EGR | kPa / Volts | 65 - 110 kPa (Depends on altitude and barometric pressure). | Information Sensors |
Cam Signal Present | Misfire | Yes / No | Yes | DTC P0341 CMP Sensor Circuit Performance |
Clutch Pedal Switch | Engine 2 | Applied / Released | Released | DTC P0704 Clutch Switch Circuit |
Commanded A/C | Catalyst Engine 2 Misfire | On / Off | Off (On with A/C compressor engaged) | PCM Controlled Air Conditioning |
Commanded Fan 1/Commanded Fan 2 | Catalyst Engine 2 | On / Off | Off (On with fans running) | Electric Cooling Fan |
Commanded Gen | Engine 1 | On / Off | On | DTC P0560 System Voltage |
Cruise Engaged | Engine 1 | Engaged/Disengaged | No | DTC P1554 Cruise Control Status Circuit |
Cruise Inhibited | Engine 1 | Yes / No | Yes | DTC P1554 Cruise Control Status Circuit |
Current Gear | Engine 1 EGR | 1 / 2 / 3 / 4 | 1 | Automatic Transmission Diagnosis |
Decel Fuel Mode | Engine 1 EGR HO2S Catalyst Misfire | Active / Inactive | Inactive | Fuel Metering Modes of Operation |
Desired EGR Position | Engine 1 Engine 2 EGR Misfire | Percent | 0% | DTC P1406 EGR Valve Pintle Position Circuit |
Desired Idle Speed | Engine 1 Engine 2 EGR EVAP | RPM | PCM commanded idle speed (varies with temperature). | Idle Air Control System Check |
ECT | Engine 1 , Engine 2 EGR Catalyst HO2S Misfire | °C, °F | 85°C - 105°C / 185°F - 220°F (varies with temperature). | Information Sensors |
EGR Closed Valve Pintle Position | EGR | Volts | 0.14-1.0 volt | DTC P1406 EGR Valve Pintle Position Circuit |
EGR Duty Cycle | EGR | Percent | 0% | DTC P1406 EGR Valve Pintle Position Circuit |
EGR Feedback | EGR | Volts | 0.14 - 1.0 volt | DTC P1406 EGR Valve Pintle Position Circuit |
EGR Position Error | EGR | Percent | 0% - 100% | DTC P1406 EGR Valve Pintle Position Circuit |
EGR Flow Test Count | EGR | Counts | 0 - 10 | DTC P1406 EGR Valve Pintle Position Circuit |
Engine Load | Engine 2 Catalyst Misfire | Percent | 2% - 5% at idle 7% - 10% at 2500 RPM | -- |
Engine Run Time | Engine 1 Engine 2 EVAP Catalyst | Hr: Min: Sec | Depends on time since startup. | -- |
Engine Speed | Engine 1 Engine 2 EGR EVAP Catalyst HO2S Misfire | RPM | ± 100 RPM from Desired Idle Speed | -- |
EVAP Canister Purge | EVAP HO2S | Percent | 0% - 25% (varies) | EVAP Control System |
EVAP Fault History | EVAP | Fault / No Fault | No Fault | EVAP Control System |
EVAP Vent Solenoid | EVAP | Open / Closed | Varies | EVAP Control System |
Fuel Pump | Engine 2 | On / Off | On | Fuel Supply Components |
Fuel Tank Level | EVAP | Percent | Varies | DTC P1653 Fuel Level Output Control Circuit |
Fuel Tank Pressure | EVAP | Volts | Varies | DTC P0452 Fuel Tank Pressure Sensor Low DTC P0453 Fuel Tank Pressure High |
Fuel Tank Pressure | EVAP | In H2O | Varies | DTC P0452 Fuel Tank Pressure Sensor Low DTC P0453 Fuel Tank Pressure High |
Fuel Trim Cell | Engine 1 Misfire | Cell # | 0 | DTC P0172 Fuel Trim System Rich Bank1 |
Fuel Trim Learn | Engine Catalyst | Enabled / Disabled | Enabled | DTC P0171, P0172, P0174 and P0175 |
Generator Lamp | Engine 2 | On / Off | Off | PCM Controlled Warning Lamps |
HO2S Bank 1 Sensor 1 / HO2S Bank 2 Sensor 1 | Engine 1 Catalyst HO2S | Not Ready / Ready | Ready | Information Sensors |
HO2S Bank 1 Sensor 1 / HO2S Bank 2 Sensor 1 | Engine 1 Catalyst HO2S | millivolts | 0 - 1000, constantly varying | Information Sensors |
HO2S Bank 1 Sensor 3 | Engine 1 Catalyst HO2S | mIllivolts | 0 - 1000,varies | Information Sensors |
HO2S Warm-Up Bank 1 Sensor 1 / Bank 2 Sensor 1 / Bank 1 Sensor 3 | HO2S | Min: Sec | Depends on startup intake air temperature, startup engine coolant temperature, and time to HO2S activity. | Information Sensors |
HO2S XCounts Bank 1 / HO2S XCounts Bank 2 | HO2S | Counts | Varies | -- |
IAC Position | Engine 1 Engine 2 EGR Catalyst Misfire | Counts | 10 - 40 | Idle Air Control System Check |
IAT | Engine 1 Engine 2 EVAP Catalyst HO2S | °C, °F | Varies with ambient air temperature. | Information Sensors |
Ignition 1 | Engine 1 Engine 2 EGR HO2S | Volts | 13 (Varies) | DTC P0560 System Voltage |
Ignition Mode | Engine 2 | IC / Bypass | IC | Electronic Ignition System |
Injector Pulse Width | Engine 1 | milliseconds | 1.5 - 3.5 (Varies with engine load) | -- |
Knock Retard | Engine 2 | Degrees | 0° | Knock Sensor System |
Long Term Fuel Trim BN1 | Engine 1 Misfire | Percent | -10% - 10% | DTC P0171 Fuel Trim System Lean Bank1 |
Long Term Fuel Trim BN2 | Engine 1 Misfire | Percent | -10% - 10% | DTC P0174 Fuel Trim System Lean Bank2 |
Loop Status | Engine 1 Catalyst HO2S Misfire | Open / Closed | Closed | Fuel Metering Modes of Operation |
MAF | Engine 1 Engine 2 EVAP Catalyst HO2S | gm/s | 3 - 6 gm/s at idle 13 - 16 gm/s at 2500 RPM (Depends on engine load and barometric pressure) | Information Sensors |
MAF Frequency | Engine 1 | Hz | 1200 - 3000 (Depends on engine load and barometric pressure) | DTC P0102 MAF Sensor Circuit Low Frequency |
MAP | Engine 1 Engine 2 EGR EVAP | kPa / Volts | 29 - 48 kPa / 1 - 2 Volts (Depends on engine load and barometric pressure). | Information Sensors |
MIL | Engine 2 | On / Off | Off | No Malfunction Indicator Lamp |
Misfire Current Cylinder # | Misfire | Counts | 0 - 4 | DTC P0300 Engine Misfire Detected |
Misfire History Cylinder # | Misfire | Counts | 0 - 6 | DTC P0300 Engine Misfire Detected |
Misfiring Cylinder | Misfire | Cylinder # / 0 | 0 | DTC P0300 Engine Misfire Detected |
Power Enrichment | Engine 1 Engine 2 Catalyst HO2S Misfire | Active / Inactive | Inactive | Fuel Metering Modes of Operation |
Rich/Lean | Engine 1 | Rich / Lean | Constantly changing | Fuel Metering Modes of Operation |
Short Term Fuel Trim BN1 | Engine 1 Catalyst Misfire | Percent | -10% - 10% | DTC P0171 Fuel Trim System Lean Bank1 |
Short Term Fuel Trim BN2 | Engine 1 Catalyst Misfire | Percent | -10% - 10% | DTC P0174 Fuel Trim System Lean Bank2 |
Spark | Engine 2 | Degrees | -20° (varies) | Electronic Ignition System |
Start Up ECT | EVAP HO2S | °C, °F | Depends on engine coolant temperature at time of startup | DTC P0125 ECT Excessive Time to Closed Loop |
Start Up IAT | EVAP HO2S | °C, °F | Depends on intake air temperature at time of startup | DTC P0125 ECT Excessive Time to Closed Loop |
Throttle at Idle | Engine 1 | Yes / No | Yes | DTC P0123 TP Sensor Circuit High Voltage |
Total Misfire Current Count | Misfire | Counts | 0 - 255 | DTC P0300 Engine Misfire Detected |
Total Misfire Failures Since First Fail | Misfire | Counts | 0 | DTC P0300 Engine Misfire Detected |
Total Misfire Passes Since First Fail | Misfire | Counts | 0 | DTC P0300 Engine Misfire Detected |
TP Angle | Engine 1 Engine 2 EGR Catalyst HO2S Misfire | Percent | 0% | DTC P0123 TP Sensor Circuit High Voltage |
TP Sensor | Engine 1 | Volts | 0.20 - 0.74 | Information Sensors |
TR Switch A / B / C | Engine 2 | Low/High | Varies depending on gear selected | Automatic Transmission Diagnosis |
Trans Range | Engine 2 | Park / Reverse / Neutral / Drive 4 / Drive 3 / Drive 2 / Low | Park | Automatic Transmission Diagnosis |
TWC Diagnostic | Catalyst | Enabled / Disabled | Enabled | DTC P0420 TWC System Low Efficiency |
TWC Monitor Test Counter | Catalyst | Counts | 0 | DTC P0420 TWC System Low Efficiency |
TWC Protection | Engine 1 Engine 2 Catalyst HO2S Misfire | Active / Inactive | Inactive | Fuel Metering Modes of Operation |
Vehicle Speed | Engine 1 Engine 2 EGR Catalyst Misfire | MPH, Km/h | 0 | Automatic Transmission Diagnosis |
VTD Fuel Disable | Engine 2 | Active / Inactive | Inactive | DTC P1629 Theft Deterrent Crank Signal Malfunction |
