Scan Tool Data List
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The Engine Scan Tool Data List contains all engine related parameters that are available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists, and in some cases may appear more than once, or in more than one data list in order to group certain related parameters together.
Use the Engine Scan Tool Data List only after the following is determined:
- The Diagnostic System Check - Engine Controls is completed.
- No diagnostic trouble codes (DTCs) are present.
- 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 Engine Scan Tool Data List represents values that would be seen on a normal running engine.
IMPORTANT:
A scan tool that displays faulty data should not be used. The scan tool problem should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.
Only the parameters listed below are referenced in this service manual for use in diagnosis. If all values are within the typical range described below, refer to for diagnosis.
The column labeled Data List indicates where a parameter can be located on the scan tool. Refer to the scan tool operating manual for the exact locations of the data lists. The following is a description of each term listed:
- All
-
The parameter is in all of the data lists indicated below.
- Eng 1
-
Engine 1 Data List
- Eng 2
-
Engine 2 Data List
- FS
-
Fuel System Data List
- EGR
-
Exhaust Gas Recirculation (EGR) Data List
- TC
-
TC Data List
- FF/FR
-
Freeze Frame/Failure Records Data List
Scan Tool Data List
| Scan Tool Parameter | Data List | Units Displayed | Typical Data Value |
|---|---|---|---|
| Operating Conditions: Engine Idling/Lower Radiator Hose Hot/Closed Throttle/Park or Neutral/Accessories Off | |||
| 4WD Low Signal | Eng 1 | Enabled/Disabled | Disabled |
| 4WD Signal | Eng 1 | Enabled/Disabled | Disabled |
| 5 volts Reference 1 | FS | Volts | Varies |
| 5 volts Reference 2 | FS | Volts | Varies |
| 5 volts Reference 3 | FS | Volts | Varies |
| A/C Clutch Feedback Signal | Eng 1 | Relay ON/OFF | Relay OFF |
| A/C High Side Pressure | Eng 1 | Volts | Varies |
| A/C Relay Command | Eng 1, EGR, TC | ON/OFF | Off |
| A/C Request Signal | Eng 1 | Yes/No | No |
| A/C Sec. High Press. SW | Eng 1 | Open/Closed | Closed |
| Actual Fuel Rail Pressure | All | MPa/PSI | 37-40 MPa (5,200-5,800 PSI) |
| APP Indicated Angle | All | % | 0.0 |
| APP Sensor 1 | Eng 1, FF/FR | Volts |
|
| APP Sensor 2 | Eng 1, FF/FR | Volts |
|
| APP Sensor 3 | Eng 1, FF/FR | Volts |
|
| Balancing Rate Cyl. 1-8 | Eng 2, FF/FR | mm3 | -4.0 to +4.0 |
| BARO | Eng 1, EGR, TC, FF/FR | kPa | 65-104 (Varies with altitude) |
| Battery Voltage | Eng 1 | Volts | 12-14 (Accuracy +/- 0.4 Volts) |
| Boost Pressure Sensor | Eng 1, EGR, TC, FF/FR | kPa/PSI | 60-170 kPa (8-24 PSI) (All RPM) |
| Boost Pressure Sensor | TC | volts | Varies |
| Calculated Fuel Rate | All | mm3 | 7-9 |
| CAM Reference Signal Missed | Eng 1 | Counts | 0 |
| CAM Signal Present | Eng 1 | Yes/No | Yes |
| Check Trans Lamp | Eng 1 | ON/OFF | OFF |
| CKP Sensor Pulses Missed | Eng 1 | Counts | 0 |
| Clutch Pedal Switch | Eng 1 | Applied/Released | Released |
| Cruise Control Active | Eng 1 | Yes/No | No |
| Cruise ON/OFF Switch | Eng 1 | ON/OFF | OFF |
| Cruise/Resume/Accel Switch | Eng 1 | ON/OFF | OFF |
| Cruise Set/Coast Switch | Eng 1 | ON/OFF | OFF |
| Crank Signal Present | Eng 1 | Yes/No | Yes |
| Desired EGR Position | EGR | % | Varies |
| Desired FRP Regulator | FS | mA | 1,200-1,400 |
| Desired Fuel Rail Pressure | All | MPa/PSI | 37-40 MPa (5,200-5,800 PSI) |
| Desired Idle Speed | Eng 1, FF/FR | RPM | 630-700 |
| Desired TC Vane Position | TC | % | 20% |
| Desired TC Vane Pos. Ctrl. Solenoid | TC | Amps | 0.1 |
| DTC Set This Ignition | Eng 1 | Yes/No | No |
| ECT Sensor | Eng 1, FS, EGR, TC, FF/FR | °C/°F | 85°C-105°C /185°F-220°F (Varies with temperature) |
| EGR Learned Minimum Position | EGR | % | Varies |
| EGR Position Sensor | EGR | Volts | Varies |
| EGR Position Sensor | EGR | % | Varies |
| EGR Position Variance | EGR | % | Varies |
| EGR Solenoid Command | EGR | % | Varies |
| Engine Oil Level Switch | Eng 1 | OK/Fault | OK |
| Engine Oil Life Remaining | Eng 1 | % | Varies |
| Engine Oil Pressure Sensor | FS | kPa/PSI | Varies |
| Engine Run Time | All | Hrs/Mins/Sec | Varies with engine run time |
| Engine Speed | All | RPM | +/-100 RPM from desired |
| Fail Counter | FR | counts | Varies |
| FRP Regulator Command | Eng 1, Eng 2, FS, TC, FF/FR | % | 40-50 |
| FRP Regulator Command | FS, FF/FR | mA | Varies |
| FRP Regulator Relay | Eng 1 | ON/OFF | ON |
| FRP Regulator Fuel Flow Command | FS | mm3 | Varies |
| Front Axle Switch | Eng 1 | Lock/Unlock | Unlock |
| Fuel Level Sensor | FS | % | Varies |
| Fuel Level Sensor | FS | Volts | Varies with fuel level |
| Fuel Level Sensor Rear | FS | Volts | Varies |
| Fuel Temperature Sensor | Eng 1, Eng 2, FS, FF/FR | °C/°F | 10-90°C/50-194°F |
| Glow Plug Relay | Eng 1 | ON/OFF | OFF |
| GEN L Terminal Signal | Eng 1 | Voltage/No Voltage | No Voltage |
| High Idle Swtch-if equipped | Eng 1 | ON/OFF | OFF |
| IAT Sensor | Eng 1, EGR, TC, FF/FR | °C/°F | 10-90°C/50-194°F (temperatures may increase under heavy engine loads) |
| Ignition 1 Signal | Eng 1, EGR, TC, FF/FR | Volts | 12-14 (accuracy +/-0.4 volts) |
| Ignition Off Time | EGR, TC | minutes | Varies |
| Injector 1-8 Command | Eng 2, FF/FR | ms | 0.3-0.5 |
| Low Coolant Level | Eng 1 | Yes/No | No |
| MAF | Eng 1 | Volts | Varies |
| MAF Sensor | Eng 1, FS, EGR, TC, FF/FR | g/s | 45-50 |
| Main Injection Command | FS | microseconds | Varies |
| Main Injection Fuel Rate | FS | mm3 | 6.5-8.5 |
| Main Injection Timing | Eng 1, Eng 2, FS, FF/FR | degrees | Varies |
| MIL Command | Eng 1 | ON/OFF | OFF |
| Mileage Since First Failure | FF/FR | Miles/Km | Varies |
| Mileage Since Last Failure | FF/FR | Miles/Km | Varies |
| Not Run Counter | FR | counts | Varies |
| Pass Counter | FR | counts | Varies |
| PCM in VTD Fail Enable | Eng 1 | Yes/No | No |
| PCM Reset | Eng 1, EGR, TC | Yes/No | No |
| Pilot Injection Command | FS | microseconds | Varies |
| Pilot Injection Fuel Rate | FS | mm3 | 0.8-1.0 |
| Pilot Injection Timing | FS | degrees | Varies |
| PNP Switch | Eng 1, EGR | In Gear/Park/Neutral | Park/Neutral |
| PTO Enable | Eng 1 | YES/NO | NO |
| PTO Engage Relay Command | Eng 1 | ON/OFF | OFF |
| PTO Engine Shutdown Signal | Eng 1 | YES/NO | NO |
| PTO Feedback Signal | Eng 1 | Relay ON/Relay OFF | Relay OFF |
| Reverse Enable | Eng 1 | Yes/No | No |
| Start up ECT | Eng 1, FF/FR | °C/°F | Varies (ECT at time of engine startup) |
| Start up IAT | Eng 1 | °C/°F | Varies (IAT at time of engine startup) |
| Stoplamp Pedal Switch | Eng 1 | Applied/Released | Released |
| TC Vane Learned Closed Position | TC | counts | Varies |
| TC Vane Learned Open Position | TC | counts | Varies |
| TC Vane Position Learned | TC | Yes/No | Yes |
| TC Vane Position Sensor | TC | Amps | 0.1 |
| TC Vane Pos. Ctrl. Solenoid | TC | % | 70 |
| TCC/Cruise Brake Pedal Switch | Eng 1 | Applied/Released | Released |
| Vehicle Speed Sensor | Eng 1, FS, EGR, TC, FF/FR | mph/km/h | 0 |
| VTD Auto Learn Timer | Eng 1 | Active/Inactive | Inactive |
| VTD Fuel Disable | Eng 1 | Active/Inactive | Inactive |
| VTD Fuel Disable Until Ign. Off | Eng 1 | Yes/No | No |
| Wait To Start | Eng 1 | ON/OFF | OFF |
| Water In Fuel | Eng 1 | ON/OFF | OFF |