Use the Typical Scan Data Values table only after the Powertrain On-Board Diagnostic System Check has been completed, no DTC(s) 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, EVAP, A/C, and basic engine operating conditions. |
Specific Engine Data
| • | 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. |
| • | CATALYST - Contains information specific to the TWC diagnostics and parameters required to verify proper TWC 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 | Units Displayed | Typical Data Value | Reference |
|---|---|---|---|
A/C Off For WOT | Yes / No | No | |
A/C Refrigerant Pressure | Volts | Varies with refrigerant temperature | |
A/C Pressure Out Of Range | Yes / No | No (Yes with low or high A/C refrigerant pressure) | |
A/C Request | Yes / No | No (Yes with A/C ON) | |
A/C Slugging | Active / Inactive | Inactive | |
Actual EGR Position | Percent | 0% | DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance |
Air/Fuel Ratio | Ratio | 14.2:1 - 14.7:1 | |
BARO | kPa | 65 - 110 (Depends on altitude and barometric pressure). | |
Clutch Pedal Switch | Applied / Released | Released | |
Commanded A/C | On / Off | Off (On with A/C compressor engaged) | |
Commanded Fan 1/Commanded Fan 2 | On / Off | Off (On with speed fans running) | |
Commanded Gen | On / Off | On | |
Commanded TCC | Engaged / Disengaged | Disengaged | 4L60-E Automatic Transmission Diagnosis |
Cruise Engaged | Yes / No | No | |
Cruise Inhibited | Yes / No | Yes | |
Current Gear | 1 / 2 /3 / 4 | 1 | 4L60-E Automatic Transmission Diagnosis |
Decel Fuel Mode | Active / Inactive | Inactive | |
Desired EGR Position | Percent | 0% | DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance |
Desired Idle | RPM | PCM commanded idle speed (varies with temperature). | |
ECT | °C, °F | 85°C - 105°C / 185°F - 220°F (varies with temperature). | |
EGR Closed Valve Pintle Position | Volts | 0.14-1.0 volt | DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance |
EGR Duty Cycle | Percent | 0% | DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance |
EGR Feedback | Volts | 0.14 - 1.0 volt | DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance |
EGR Position Error | Percent | 0% - 9% | DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance |
EGR Flow Test Count / EGR Test Count | Counts | 0 - 10 | DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance |
Engine Load | Percent | 2% - 5% at idle 7% - 10% at 2500 RPM | -- |
Engine Run Time | Hr: Min: Sec | Depends on time since startup. | -- |
Engine Speed | RPM | ±100 RPM from Desired Idle | -- |
EVAP Purge PWM | Percent | 0% - 25% (varies) | |
EVAP Vacuum Switch | Purge / No Purge | No Purge (Purge if over 25% EVAP Purge PWM is commanded). | |
Fuel Pump | On / Off | On | Fuel Supply Components |
Fuel Trim Cell | Cell # | 0 | |
Fuel Trim Learn | Disabled / Enabled | Enabled | -- |
Generator Lamp | On / Off | Off | |
HO2S Bank 1 Sensor 1 / HO2S Bank 2 Sensor 1 | Not Ready / Ready | Ready | |
HO2S Bank 1 Sensor 1 / HO2S Bank 2 Sensor 1 | millivolts | 0 - 1000, constantly varying | |
HO2S Bank 1 Sensor 2 / HO2S Bank 1 Sensor 3 | mIllivolts | 0 - 1000,varies | |
HO2S Warm-Up Bank 1 Sensor 1 / Bank 2 Sensor 1 / Bank 1 Sensor 2 / Bank 1 Sensor 3 | Min: Sec | Depends on startup intake air temperature, startup engine coolant temperature, and time to HO2S activity. | |
HO2S XCounts Bank 1 / HO2S XCounts Bank 2 | Counts | Varies | -- |
IAC Position | Counts | 10 - 40 | |
IAT | °C, °F | Varies with ambient air temperature. | |
Idle Speed Error | RPM | Less than 100 | |
Ignition 1 | Volts | 13 (Varies) | |
Ignition Mode | IC / Bypass | IC | |
Injector Pulse Width | milliseconds | 1.5 - 3.5 (Varies with engine load) | -- |
Knock Retard | Degrees | 0° | |
KS Active Counter / KS Activity | Yes / No | No | |
KS Minimum Learned Noise | Volts | 0.1 - 3.0 (varies) | |
KS Noise Channel | Volts | 0.1 - 3.0 (varies) | |
Long Term Fuel Trim BN1 | Percent | -10% - 10% | |
Long Term Fuel Trim BN2 | Percent | -10% - 10% | |
Loop Status | Open / Closed | Closed | |
MPH / km/h | MPH, Km/h | 0 | 4L60-E Automatic Transmission Diagnosis |
MAF | gm/s | 3 - 6 gm/s at idle 13 - 16 gm/s at 2500 RPM (Depends on engine load and barometric pressure) | |
MAF Frequency | Hz | 1200 - 3000 (Depends on engine load and barometric pressure) | |
MAP | kPa / Volts | 29 - 48 kPa / 1 - 2 Volts (Depends on engine load and barometric pressure). | |
MIL | On / Off | Off | |
Misfire Failures Since First Fail | Counts | 0 | |
Misfire Cur. #1-#6 | Counts | 0 - 4 | |
Misfire Failures Since First Fail | Counts | 0 | |
Misfire Hist. #1-#6 | Counts | 0 | |
Misfire Passes Since First Fail | Counts | 0 | |
Power Enrichment | Active / Inactive | Inactive | |
Rich/Lean | Rich / Lean | Constantly changing | |
Short Term Fuel Trim BN1 | Percent | -10% - 10% | |
Short Term Fuel Trim BN2 | Percent | -10% - 10% | |
Spark | Degrees | -20° (varies) | |
Start Up EC | °C, °F | Depends on engine coolant temperature at time of startup | -- |
Start Up IAT | °C, °F | Depends on intake air temperature at time of startup | -- |
Throttle at Idle | Yes / No | Yes | DTC P0123 Throttle Position (TP) Sensor Circuit High Voltage |
Total Misfire Failures Since First Fail | Counts | 0 | |
Total Misfire Passes Since First Fail | Counts | 0 | |
Total Misfire Current Count | Counts | 0 - 5 | |
TP Angle | Percent | 0% | DTC P0123 Throttle Position (TP) Sensor Circuit High Voltage |
TP Sensor | Volts | 0.20 - 0.74 | |
Trans Hot Mode | Active / Inactive | Inactive | 4L60-E Automatic Transmission Diagnosis |
Trans Range | Park / Reverse / Neutral / Drive 4 / Drive 3 / Drive 2 / Low | Park | 4L60-E Automatic Transmission Diagnosis |
TR A B C | X / 0 | X 0 X | 4L60-E Automatic Transmission Diagnosis |
TWC Diagnostic | Enabled / Disabled | Enabled | |
TWC Monitor Test Counter | Counts | 0 | |
TWC Protection | Active / Inactive | Inactive | |
Vehicle Speed - Refer to MPH / km/h | MPH, Km/h | 0 | 4L60-E Automatic Transmission Diagnosis |
VTD Fuel Disable | Active / Inactive | Inactive |
