For 1990-2009 cars

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 | PCM Controlled Air Conditioning
A/C Refrigerant Pressure | Volts | Varies with refrigerant temperature | DTC P0530 Air Conditioning (A/C) Refrigerant Pressure Sensor Circuit
A/C Pressure Out Of Range | Yes / No | No (Yes with low or high A/C refrigerant pressure) | PCM Controlled Air Conditioning
A/C Request | Yes / No | No (Yes with A/C ON) | PCM Controlled A/C Circuit Diagnosis
A/C Slugging | Active / Inactive | Inactive | PCM Controlled A/C Circuit Diagnosis
Actual EGR Position | Percent | 0% | EGR System
Air/Fuel Ratio | Ratio | 14.2:1 - 14.7:1 | Fuel Metering System Components
BARO | kPa | 65 - 110 (Depends on altitude and barometric pressure). | Information Sensors
Boost Sol. PWM | Percent | 100% | Boost Control System
Commanded A/C | On / Off | Off (On with A/C compressor engaged) | PCM Controlled Air Conditioning
Commanded Fan 1/Commanded Fan 2 | On / Off | Off (On with low speed fans running) | Electric Cooling Fan
Commanded Gen | On / Off | On | DTC P0560 System Voltage
Commanded TCC | Engaged / Disengaged | Disengaged | 4T60-E Automatic Transaxle Diagnosis
Cruise Engaged | Yes / No | No | DTC P1662 Cruise Control Inhibit Output Circuit
Cruise Inhibited | Yes / No | Yes | DTC P1662 Cruise Control Inhibit Output Circuit
Current Gear | 1 / 2 /3 / 4 | 1 | 4T60-E Automatic Transaxle Diagnosis
Decel Fuel Mode | Active / Inactive | Inactive | Fuel Metering Modes of Operation
Delivered Torque | Percent | 5% - 20% (Varies with load) | DTC P1653 Traction Control Delivered Torque Output Circuit Section 5E2
Desired EGR Position | Percent | 0% | EGR System
Desired Idle | RPM | PCM commanded idle speed (varies with temperature). | Idle Air Control System Check
Desired Torque | Percent | 80% - 95% | DTC P1571 Traction Control Torque Request Circuit
ECT | °C, °F | 85°C - 105°C / 185°F - 220°F (varies with temperature). | Information Sensors
EGR Closed Valve Pintle Position | Volts | 0.14-1.0 volt | EGR System
EGR Duty Cycle | Percent | 0% | EGR System
EGR Feedback | Volts | 0.14 - 1.0 volt | EGR System
EGR Position Error | Percent | 0% - 9% | EGR System
EGR Test Count / EGR Flow Test Count | Counts | 0 - 10 | EGR System
Engine Load | Percent | 2% - 5% at idle 7% - 10% at 2500 RPM | --
Engine Oil Level - Refer to Oil Level | Ok / Low | Ok | PCM Controlled Warning Lamps
Engine Run Time | Hr: Min: Sec | Depends on time since startup. | --
Engine Run Time | RPM | ±100 RPM from Desired Idle | Information Sensors
EVAP Canister Purge / EVAP Purge PWM | Percent | 0% - 25% (varies) | EVAP Control System (G Car, C Car, and H Car VIN 1)
EVAP Vacuum Switch | Purge / No Purge | No Purge (Purge if over 25% EVAP Purge PWM is commanded). | EVAP Control System (G Car, C Car, and H Car VIN 1)
Fuel Pump | On / Off | On | Fuel Supply Components
Fuel Pump Speed | Normal / High | Normal | Fuel Supply Components
Fuel Trim Cell | Cell # | 0 | DTC P0171 Fuel Trim System Lean
Fuel Trim Learn | Disabled / Enabled | Enabled | --
Gen F Terminal / Generator PWM | Percent | Varies | Engine Electrical Section 6D
Generator Lamp | On / Off | Off | PCM Controlled Warning Lamps
HO2S Sen. 1 | Not Ready / Ready | Ready | DTC P0135 HO2S Heater Performance Sensor 1
HO2S Sen. 1 | millivolts | 0 - 1000, constantly varying | DTC P0135 HO2S Heater Performance Sensor 1
HO2S Sen. 2 | mIllivolts | 0 - 1000,varies | DTC P0141 HO2S Heater Performance Sensor 2
HO2S Warm Up Time | Min: Sec | Depends on startup intake air temperature, startup engine coolant temperature, and time to HO2S activity. | DTC P0135 HO2S Heater Performance Sensor 1
HO2S XCount | Counts | Varies | Information Sensors
IAC Position | Counts | 10 - 40 | Idle Air Control System Check
IAT | °C, °F | Varies with ambient air temperature. | Information Sensors
Idle Speed Error | RPM | Less than 100 | Idle Air Control System Check
Ignition 1 | Volts | 13 (Varies) | Electronic Ignition (EI) System
Ignition Mode | IC / Bypass | IC | Electronic Ignition (EI) System
Injector Pulse Width | milliseconds | 1.5 - 3.5 (Varies with engine load) | --
Knock Retard | Degrees | 0° | Knock Sensor (KS) System
KS Active Counter / KS Activity | Yes / No | No | Knock Sensor (KS) System
KS Minimum Learned Noise | Volts | 0.1 - 3.0 (varies) | Knock Sensor (KS) System
KS Noise Channel | Volts | 0.1 - 3.0 (varies) | Knock Sensor (KS) System
Long Term Fuel Trim | Percent | -10% - 10% | DTC P0172 Fuel Trim System Rich
Loop Status | Open / Closed | Closed | Fuel Metering Modes of Operation
Low Oil Lamp | On / Off | Off | PCM Controlled Warning Lamps
MPH / km/h | MPH, Km/h | 0 | 4T60-E Automatic Transaxle Diagnosis
MAF | 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 | Hz | 1200 - 3000 (Depends on engine load and barometric pressure). | Information Sensors
MAP | kPa / Volts | 29 - 48 kPa / 1 - 2 Volts (Depends on engine load and barometric pressure). | Information Sensors
MIL | On / Off | Off | Malfunction Indicator Lamp (MIL) Inoperative
Misfire Cur. #1-#6 | Counts | 0 - 4 | DTC P0300 Engine Misfire Detected
Misfire Failures Since First Fail | Counts | 0 | DTC P0300 Engine Misfire Detected
Misfire Hist. #1-#6 | Counts | 0 | DTC P0300 Engine Misfire Detected
Misfire Passes Since First Fail | Counts | 0 | DTC P0300 Engine Misfire Detected
Oil Level | Ok / Low | Ok | DTC P0300 Engine Misfire Detected
Power Enrichment | Active / Inactive | Inactive | Fuel Metering Modes of Operation
Rich/Lean | Rich / Lean | Constantly changing | Fuel Metering System Components
Short Term Fuel Trim | Percent | -10% - 10% | DTC P0171 Fuel Trim System Lean
Spark | Degrees | -20° (varies) | Electronic Ignition (EI) System
Start Up ECT | °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 | --
TCC Enable | On / Off | Off | 4T60-E Transaxle Diagnosis
Throttle at Idle | Yes / No | Yes | DTC P0123 Throttle Position (TP) Sensor Circuit High Voltage
Total Misfire Current Count | Counts | 0 - 5 | DTC P0300 Engine Misfire Detected
Total Misfire Failures Since First Fail - Refer to Misfire Failures Since First Fail | Counts | 0 | DTC P0300 Engine Misfire Detected
Total Misfire Passes Since First Fail - Refer to Misfire Passes Since First Fail | Counts | 0 | DTC P0300 Engine Misfire Detected
TP Angle | Percent | 0% | DTC P0123 Throttle Position (TP) Sensor Circuit High Voltage
TP Sensor | Volts | 0.20 - 0.74 | DTC P0123 Throttle Position (TP) Sensor Circuit High Voltage
Traction Control | Active / Inactive | Inactive | Section 5E2
Traction Control Desired Torque - Refer to Desired Torque | Percent | 80% - 95% | DTC P1571 Traction Control Torque Request Circuit
Traction Control Torque - Refer to Delivered Torque | Percent | 5% - 20% (Varies with load) | DTC P1653 Traction Control Delivered Torque Output Circuit Section 5E2
Transmission Range | Park / Reverse / Neutral / Drive 4 / Drive 3 / Drive 2 / Low | Park | Information Sensors
TR P A B C | X / 0 | 0 0 X X | Information Sensors
Trans Hot Mode | Active / Inactive | Inactive | 4T60-E Transaxle Diagnosis
TWC Diagnostic | Enabled / Disabled | Enabled | DTC P0420 Catalyst System Low Efficiency
TWC Monitor Test Counter | Counts | 0 | DTC P0420 Catalyst System Low Efficiency
TWC Protection | Active / Inactive | Inactive | DTC P0420 Catalyst System Low Efficiency
Vehicle Speed - Refer to MPH / km/h | MPH, Km/h | 0 | 4T60-E Automatic Transaxle Diagnosis
VTD Fuel Disable | Active / Inactive | Inactive | DTC P1626 Theft Deterrent Fuel Enable Signal Lost