| Table 1: | Engine Data 1 |
| Table 2: | Engine Data 2 |
| Table 3: | Engine Data 3 |
| Table 4: | HO2S Data |
| Table 5: | Misfire Data 4.3L |
| Table 6: | EVAP Data |
Use the scan tool data listed in this table for comparison after the On-Board Diagnostic system check and finding the on-board diagnostics function properly with no diagnostic codes displayed.
The Typical Scan Tool Data Values are an average of display values recorded from normally operating vehicles. The Typical Scan Tool Data Values are intended to represent what a normally functioning system would display. The values you get may vary due to a low battery charge or other reasons. But they should be very close.
Do not use a scan tool that displays faulty data. Report the problem to the manufacturer. The use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement.
Use only the parameters listed in the tables for diagnosis. If a scan tool reads other parameters, the values are not recommended by General Motors for use in diagnosis. For more description on the values and the use of the scan tool diagnosis the VCM inputs, refer to the applicable diagnosis. If all values are within the range illustrated, refer to Driveability Symptoms.
Scan Tool Data Display
Engine at Operating Temp/Engine Idling in Closed Loop/Closed Throttle/Park or Neutral/Accessories OFF | ||
|---|---|---|
Scan Position | Units Displayed | Typical Data Value |
Engine Speed | RPM | 650 RPM |
Desired Idle | RPM | 652 RPM |
Startup ECT | Degrees | Varies |
ECT | Degrees | 93°C (200°F) |
ECT Sensor | Volts | 2.00 volts |
Startup IAT | Degrees | Varies |
IAT | Volts | 1.46 Volts |
IAT Sensor | Degrees | 43°C (109°F) |
Air Fuel Ratio | Ratio | 14.7:1 |
IAC Position | Counts | 18 Counts |
Desired IAC | Counts | 18 Counts |
TP Sensor | Volts | 0.47 Volts |
TP Angle | % | 0% |
MAP | kPa | 38 kPa |
MAP Sensor | Volts | 1.46 Volts |
BARO | kPa | 101 kPa |
BARO | Volts | 4.76 Volts |
Ignition 1 | Volts | 13.5 Volts |
Engine Speed | RPM | 650 RPM |
Long Term FT Bank 1 | %/Counts | 0%/126 |
Long Term FT Bank 2 | %/Counts | 0%/126 |
Short Term FT Bank 1 | %/Counts | 0%/0.0 |
Short Term FT Bank 2 | %/Counts | 0%/0.0 |
Fuel Trim Cell Bank 1 | Counts | 17 |
Fuel Trim Cell Bank 2 | Counts | 17 |
KS Activity | Yes/No | No |
Knock Sensor | Volts | 4.8 Volts |
Spark Advance | Degrees | 21° |
Knock Retard | Degrees | 0°- 2° |
Cam Retard | Degrees | 0°- 2° |
Engine Run Time | Min/Sec | Varies |
Scan Tool Data Display
Engine at Operating Temp/Engine Idling in Closed Loop/Closed Throttle/Park or Neutral/Accessories OFF | ||
|---|---|---|
Scan Position | Units Displayed | Typical Data Value |
Engine Speed | RPM | 650 RPM |
Desired Idle | RPM | 650 RPM |
EVAP Duty Cycle | % | 17% |
EVAP Canister Purge | Off/On | On |
Air Fuel Ratio | Ratio | 14.7:1 |
EGR Duty Cycle | % | 0% |
Actual EGR Position | % | 0% |
Desired EGR Position | % | 0% |
EGR Sensor | Volts | 0.82 Volts |
Air Fuel Ratio | Ratio | 14.7:1 |
Ignition 1 | Volts | Varies |
IAC Position | Counts | 18 Counts |
Desired IAC | Counts | 18 Counts |
ECT | Degrees | 93°C (200°F) |
Start Up ECT | Degrees | 43° C (109 |
IAT | Degrees | Varies |
Cam Retard | Degrees | 0° - 20° |
Spark Control | Retard/Advance | Varies |
Power Enrichment | Yes/No | Yes/NoNo |
Brake Switch | Closed/Open | Open |
TR Switch | Current Gear | Park/Neutral |
A/B/C Range Switch | Current Gear | Park/Neutral |
Vehicle Speed | MPH | 0 MPH |
Decel Fuel Mode | Yes/No | No |
1-2 Sol. | Off/On | Off |
2-3 Sol. | Off/On | Off |
3-2 Downshift Sol. | Yes/No | No |
Cruise Mode | Off/On | Off |
TCC Enable | Yes/No | No |
TCC Duty Cycle | % | 0% |
TCC Slip Speed | RPM | 0 RPM |
Engine Run Time | Min/Sec | Varies |
Scan Tool Data Display
Engine at Operating Temp/Engine Idling in Closed Loop/Closed Throttle/Park or Neutral/Accessories OFF | ||
|---|---|---|
Scan Position | Units Displayed | Typical Data Value |
Engine Speed | RPM | 650 RPM |
Desired Idle | RPM | 650 RPM |
IAC Position | Counts | 18 Counts |
Desired IAC | Counts | 18 Counts |
INJ. PWM Average Bank 1 | ms | 3.5 ms |
INJ PWM Average Bank 2 | ms | 3.5 ms |
Engine Load | % | 5% |
MAF Frequency | Hz | |
MAF Sensor | g/s | 5 - 7g/s |
TP Sensor | Volts | 0.44 - 0.68 Volts |
TP Angle | % | 0% |
MAP | kPa | 38 kPa |
MAP | Volts | 1.46 Volts |
BARO | kPa | 95 kPa |
BARO Sensor | Volts | 4.76 Volts |
EVAP Duty Cycle | % | 17% |
EGR Duty Cycle | % | 0% |
Actual EGR Position | % | 0% |
Desired EGR Position | % | 0.0% |
EGR Sensor | Volts | 0.82 Volts |
Cam Retard | Degrees | 0°± 20° |
A/C Request | No/Yes | No |
A/C Relay | Off/On | Off |
Engine Run Time | Min/Sec | Varies |
Scan Tool Data Display
Engine at Operating Temp/Engine Idling in Closed Loop/Closed Throttle/Park or Neutral/Accessories OFF | ||
|---|---|---|
Scan Position | Units Displayed | Typical Data Value |
Engine Speed | RPM | 650 RPM |
Desired Idle | RPM | 650 RPM |
Pre HO2S | Not Ready/Ready | Ready |
Post HO2S | Not Ready/Ready | Ready |
HO2S Bank 1 Sensor 1 | mV | Varies |
HO2S Bank 1 Sensor 2 | mV | Varies |
HO2S Bank 2 Sensor 1 | mV | Varies |
HO2S Bank 1 Sensor 3 | mV | Varies |
Air Fuel Ratio | Ratio | 14.7:1 |
HO2S XCounts Bank 1 | Counts | Varies |
HO2S XCounts Bank 2 | Counts | Varies |
Rich/Lean Bank 1 | Rich/Lean | Varies |
Rich/Lean Bank 2 | Rich/Lean | Varies |
Loop Status | Closed/Open | Closed |
Cl Since Restart | No/Yes | Yes |
IAC Position | Counts | 36 Counts |
Desired IAC | Counts | 36 Counts |
MAF | g/s | 4.5 g/s |
Long Term FT Bank 1 | % | 0% |
Long Term FT Bank 1 | Counts | 127 Counts |
Long Term FT Bank 2 | % | 0% |
Long Term FT Bank 2 | Counts | 123 Counts |
Short Term FT Bank 1 | % | 0% |
Short Term FT Bank 1 | Counts | 128 Counts |
Short Term FT Bank 2 | % | 0% |
Short Term FT Bank 2 | Counts | 128 Counts |
Long Term Fuel Trim | Disenabled/Enabled | Enabled |
Fuel Trim Cell Bank 1 | Cell | Cell 17 |
Fuel Trim Cell Bank 2 | Cell | Cell 17 |
ECT | Degrees | 93°C (200°F) |
Startup ECT | Degrees | Varies |
Ignition 1 | Volts | 13.6 Volts |
Engine Run Time | Min/Sec | Varies |
Scan Tool Data Display
Engine at Operating Temp/Engine Idling in Closed Loop/Closed Throttle/Park or Neutral/Accessories OFF | ||
|---|---|---|
Scan Position | Units Displayed | Typical Data Value |
Engine Speed | RPM | 600 RPM |
Desired Idle | RPM | 600 RPM |
Misfire Current Cyl. #1 | Number of Misfires | 0 |
Misfire Current Cyl. #2 | Number of Misfires | 0 |
Misfire Current Cyl. #3 | Number of Misfires | 0 |
Misfire Current Cyl. #4 | Number of Misfires | 0 |
Misfire Current Cyl. #5 | Number of Misfires | 0 |
Misfire Current Cyl. #6 | Number of Misfires | 0 |
Cycles of Misfire Data | Number of Cycles | Varies |
Engine Speed | RPM | 600 RPM |
Desired Idle | RPM | 600 RPM |
Misfire History Cyl. #1 | Number of Misfires | 0 |
Misfire History Cyl. #2 | Number of Misfires | 0 |
Misfire History Cyl. #3 | Number of Misfires | 0 |
Misfire History Cyl. #4 | Number of Misfires | 0 |
Misfire History Cyl. #5 | Number of Misfires | 0 |
Misfire History Cyl. #6 | Number of Misfires | 0 |
Misfire Per Cycle Status | Counts | Varies |
IAC Position | Counts | 36 Counts |
Desired IAC | Counts | 36 Counts |
Ignition 1 On | No/Yes | Yes |
Rich/Lean Bank 1 | Rich/Lean | Varies |
Rich/Lean Bank 2 | Rich/Lean | Varies |
Brake Switch Closed | Closed/Open | Closed |
FT Enable | Off/On | On |
Decel Fuel Mode | Inactive/Active | Inactive |
Power Enrichment | Off/On | Off |
TR Switch | Park/Neutral | Park/Neutral |
TCC Forced Off | No/Yes | Yes |
TCC Enable | No/Yes | No |
Vehicle Speed | km/h | 0 km/h |
Cruise Mode | No/Yes | No |
Scan Tool Data Display
Engine at Operating Temp/Engine Idling in Closed Loop/Closed Throttle/Park or Neutral/Accessories OFF | ||
|---|---|---|
Scan Position | Units Displayed | Typical Data Value |
MAP | kPa | 35 kPa |
MAP | Volts | 1.31 Volts |
TP Sensor | Volts | 0.47 Volts |
TP Angle | % | 0% |
Fuel Level | % | Varies |
Fuel Level Sensor | Volts | 0.0 Volts |
Fuel Tank Pressure | in. H20 | Varies |
Weak Vacuum Test | Not Run/Fail | Not Run/Fail |
Small Leak Test | Not Run/Fail | Not Run/Fail |
Purge Leak Test | Not Run/Fail | Not Run/Fail |
Excess Vacuum Test | Not Run/Fail | Not Run/Fail |
EVAP Canister Purge | Off/On | On |
EVAP Vent Solenoid | Closed/Open | Open |
EVAP Duty Cycle | % | 17% |
Engine Run Time | Min/Sec | Varies |
