| Table 1: | Engine Data 1 |
| Table 2: | Engine Data 2 |
| Table 3: | HO2S 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 Speed | RPM | 650 RPM |
IAC Position | Counts | 48 Counts |
Desired IAC Position | Counts | 48 Counts |
TP Sensor | Volts | 0.47 Volts |
TP Angle | % | 0% |
Start Up ECT | Degrees | Varies |
ECT | Degrees | 93°C (200°F) |
ECT Sensor | Volts | 2.00 volts |
MAP | Volts | 0.61 Volts |
MAP | kPa | 31 kPa |
BARO | Volts | 1.95 Volts |
BARO | kPa | 100 kPa |
Startup IAT | Degrees | Varies |
IAT | Degrees | 43°C (109°F) |
IAT Sensor | Volts | 1.46 Volts |
MAF | g/s | 5.93 g/s |
MAF Frequency | Hz | 2284 Hz |
Engine Load | % | 2% idle 9-13%@2500 RPM |
Engine Speed | RPM | 650 RPM |
EVAP Canister Purge | ON/OFF | ON |
EVAP Duty Cycle | % | 17% |
EGR Duty Cycle | % | 0% |
Actual EGR Position | % | 0% |
Desired EGR Position | % | 0% |
EGR Sensor | Volts | 0.80 Volts |
Vehicle Speed | Kph, Mph | 0 Kph |
Ref. Pulse Occured | Yes/No | Yes |
Valid Ref. Pulse Occured | Yes/No | Yes |
Knock Sensor | Volts | 4.9 Volts |
KS Activity | Counts | 19 |
Spark | Degrees | 31° |
Knock Retard | Degrees | 0° |
CMP Retard | Degrees | 0° |
Spark Control | Advance/Retard | Advance |
Loop Status | Open Loop/Closed Loop | Closed Loop |
Pre HO2S | Ready/Not Ready | Ready |
Rich/Lean Bank 1 | Rich/Lean | Toggle Rich/Lean |
Rich/Lean Bank 2 | Rich/Lean | Toggle Rich/Lean |
Ignition 1 | Volts | 13.5 Volts |
Air Fuel Ratio | Ratio | 14.7:1 |
Engine Run Time | Min/Sec | Varies |
Engine at Operating Temp/Engine Idling in Closed Loop/Closed Throttle/Park or Neutral/Accessories OFF | ||
|---|---|---|
Natural Gas Operation | Yes/No | Yes |
Scan Position | Units Displayed | Typical Data Value |
Engine Speed | RPM | 650 RPM |
Desired Idle Speed | RPM | 650 RPM |
IAC Position | Counts | 48 Counts |
Desired IAC | Counts | 48 Counts |
TP Sensor | Volts | 0.61 Volts |
TP Angle | % | 0% |
Start Up ECT | Degrees | Varies |
ECT | Degrees | 93°C (200°F) |
ECT Sensor | Volts | 2.00 Volts |
Start Up IAT | Degrees | Varies |
IAT | Degrees | Varies |
MAP | Volts | 0.61-0.63 Volts |
MAP | Kpa | 31-32 kPa |
BARO | Volts | 1.96 Volts |
BARO | Kpa | 100 kPa |
Engine Load | % | 2%@idle 9-13%@2500 |
MAF | g/s | 4.6 g/s |
MAF Frequency | Hz | 2285 Hz |
Inj. Pwm. Ave B1 | ms | 0 ms |
Inj. Pwm. Ave B2 | ms | 0 ms |
EVAP Duty Cycle | % | 17% |
EVAP Canister Purge | ON/OFF | ON |
EVAP Vent Solenoid | Open/Closed | Open |
EGR Duty Cycle | % | 0% |
Actual EGR Position | % | 0% |
Desired EGR Position | % | 0% |
Rich/Lean Bank 1 | Rich/Lean | Toggle Rich/Lean |
Rich/Lean Bank 2 | Rich/Lean | Toggle Rich/Lean |
Closed Loop Since Restart | Yes/No | Yes |
VTD Fuel Disable | Active/Inactive | Inactive |
VTD Auto Learn Timer | Active/Inactive | Inactive |
VCM in VTD Fail Enable | Yes/No | Yes |
VTD Fuel Disable Until Ign. Off | Yes/No | No |
Ignition 1 | Volts | 13.5 Volts |
Ignition 1 On | Yes/No | Yes |
Ignition 1 Low | Yes/No | No |
Ignition 1 High | Yes/No | No |
A/C Request | Yes/No | NO |
A/C Relay | ON/OFF | OFF |
A/C Evaporator Sw. | Open/Closed | Closed |
A/C Sec. High Pres. Sw. | Open/Closed | Closed |
Brake Sw | Applied/Released | Released |
Mileage Since DTC Cleared | Km/Mi | Varies |
DTC Set This Ignition | Yes/No | No |
TR Switch | Park/Neutral | Park/Neutral |
A/B/C Range Switch | (ON/OFF)/(ON/OFF)/(ON/OFF) | ON/OFF/ON |
Vehicle Speed | Kph/Mph | 0 Mph |
1-2 Solenoid | ON/OFF | ON |
2-3 Solenoid | ON/OFF | ON |
3-2 Downshift Sol | ON/OFF | ON |
TCC Duty Cycle | % | 0% |
Cruise | Disable/Enable | Disable |
Decel Fuel Mode | Active/Inactive | Inactive |
Engine Run Time | Min/Sec | Varies |
Engine at Operating Temp/Engine Idling in Closed Loop/Closed Throttle/Park or Neutral/Accessories OFF | ||
|---|---|---|
Natural Gas Operation | Yes/No | Yes |
Scan Position | Units Displayed | Typical Data Value |
Engine Speed | RPM | 650 RPM |
Desired Idle Speed | RPM | 650 RPM |
IAC Position | Counts | 18 Counts |
Desired IAC Position | Counts | 18 Counts |
TP Sensor | Volts | 0.47 Volts |
TP Angle | % | 0% |
Start up ECT | Degrees | Varies |
ECT | Degrees | 93°C (200°F) |
ECT Sensor | Volts | 2.00 Volts |
Loop Status | Open Loop/Closed Loop | Closed Loop |
Pre HO2S | Not Ready/Ready | Ready |
Rich/Lean Bank 1 | Rich/Lean | Toggles Rich/Lean |
Rich/Lean Bank 2 | Rich/Lean | Toggles Rich/Lean |
HO2S Bank 1 Sensor 1 | mV | Varies |
HO2S Bank 2 Sensor 1 | mV | Varies |
HO2S XCounts Bank 1 | Counts | Varies |
HO2S XCounts Bank 2 | Counts | Varies |
Closed Loop Since Restart | Yes/No | Yes |
Air Fuel Ratio | Ratio | 14.7:1 |
MAP | Volts | 0.61-0.63 Volts |
MAP | Kpa | 31-32 kPa |
MAF | g/s | 5.98 g/s |
MAF Frequency | Hz | 2302 Hz |
Vehicle Speed | Kph/Mph | 0 Mph |
Engine Load | % | 2% idle 9-13%@2500 RPM |
Injector Average PWM Bank 1 | ms | 0 ms |
Injector Average PWM Bank 2 | ms | 0 ms |
EVAP Canister Purge | ON/OFF | ON |
EVAP Duty Cycle | % | 17% |
EGR Duty Cycle | % | 0% |
Actual EGR Position | % | 0% |
Desired EGR Position | % | 0% |
Brake Switch | Applied/Released | Released |
Mileage Since DTC Clear | Km/Mi | Varies |
DTC Set this IGN | Yes/No | No |
Engine Run Time | Min/Sec | Varies |
