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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1094 (ENGINE CONTROLS AND FUEL - 6.6L (LMM) - INTRODUCTION (1 OF 2))SCAN TOOL DATA LIST (ENGINE CONTROL MODULE)
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6

Scan Tool Data List (Engine Control Module)

2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Scan Tool Data List (Engine Control Module)
WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The Engine Control Module Scan Tool Data List contains all ECM 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 Control Module Scan Tool Data List only after the following is determined:

  • The Diagnostic System Check - Vehicle 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 Control Module 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.

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:

Eng

Engine Data

Cyl

Cyl. Deactivation Data

EGR

EGR Data

Eng. Pos.

Eng. Position Data

Eng. Spd.

Eng. Speed Cont. Data

Exh

Exh. After Treatment Data

FF/FR

Freeze Frame/Failure Records Data List

Fuel

Fuel System Data

Ind.

Induction Data

Mis.

Misfire Data

Scan Tool Data List (Engine Control Module)

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
5-Volt Reference 1 Circuit Exh. OK/Fault OK
5-Volt Reference 2 Circuit Exh. OK/Fault OK
5-Volt Reference 3 Circuit Exh. OK/Fault OK
A/C Relay Command Eng, EGR ON/OFF Off
Ambient Air Temp. Eng °C (°F) Varies
APP Indicated Angle Eng, EGR, Fuel, FF/FR % 0.0
APP Sensor 1 Eng Spd Volts 0.90-0.94
APP Sensor 1 Indicated Position Eng Spd % 0%
APP Sensor 2 Eng Spd Volts 0.40-0.50
App Sensor 2 Indicated Position Eng Spd % 0%
Balancing Rate Cyl. 1-8 Eng, Fuel mm3 -4.0 to +4.0
BARO Eng, EGR, FF/FR kPa 65-104 (Varies with altitude)
Base Injector Fuel Rate Eng Fuel mm3 5-7
Boost Pressure Sensor Eng Spd, Ind kPa BARO
CAM Signal Present Eng. Pos. Yes/No Yes
CKP Sensor Signal Present Eng. Pos. Yes/No Yes
Cmmd. A/F Equivalence Ratio Eng, Exh, Fuel, Ind Ratio 0:2:1
Coolant Level Switch Eng OK/Low OK
Cruise Control Active Eng. Yes/No No
Current Fuel Type Fuel Diesel Diesel
Desired EGR Position EGR % 20-50
Desired Fuel Rail Pressure Eng, Fuel, EGR MPa/PSI 25-35 MPa (3,626-5,076 psi)
Desired IAF Valve Position EGR, Exh, Induc. % 100
Desired Idle Speed Eng 1, FF/FR RPM 630-700
Desired TC Boost Induc., Eng, Spd. kPa BARO
Des. TC Vane Position TC % 80-100
Des. TC Vane Pos. Ctrl. Solenoid TC Amps 0.0
Distance Since DTC Cleared Eng km/miles 0
Distance Since Last DPF Regeneration Exh km/miles Varies
DPF Indicator Command Exh. ON/OFF OFF
DPF Pressure Sensor Exh. Volts 0.97-1.3
DPF Regen Inhibit Reason Exh. Reason Reason
DPF Regeneration Completed Exh. Counts Varies
DPF Regeneration Reason Exh. Reason Reason
DPF Regeneration Status Exh. Statement Not Required
DPF Soot Mass Exh. Grams 0-10
EC Ignition Relay Command Eng, Eng Spd. ON/OFF ON
ECT Sensor 1 All °C (°F) 105-185°C (221-365°F)
ECT Sensor 2 Eng °C (°F) 105-185°C (221-365°F)
EGR Learned Minimum Position EGR % 0
EGR Position Sensor EGR Volts 1-1.1
EGR Position Sensor Eng % 20
EGR Position Variance EGR % Varies
EGR Solenoid Command EGR % 5-15
EGT Sensor 1 Exh. °C (°F) 80-120°C (176-248°F)
EGT Sensor 2 Exh. °C (°F) 80-120°C (176-248°F)
Engine Load All % 1%
Engine Oil Life Remaining Eng 1 % Varies
Engine Oil Pressure Sensor Fuel kPa/PSI Varies
Engine Run Time All Hrs/Mins/Sec Varies with engine run time
Engine Run Time Since Last DPF Regeneration Exh. HH:MM:SS Varies
Engine Speed All RPM +/-50 RPM from desired
FRP Regulator Command Eng, Fuel, EGR, FF/FR % 35-45
Fuel Level Sensor Fuel Volts Varies with fuel level
Fuel Pump Relay Command Eng, Fuel ON/OFF OFF
Fuel Rail Pressure Sensor Eng, Fuel MPa 25-35 MPa (3,626-5,076 psi)
Fuel Rail Pressure Sensor Fuel Volts 1-2
Fuel Tank Level Remaining Eng, Exh., Fuel, Mis. % Varies
Fuel Temperature Sensor Eng, Fuel, FF/FR °C/°F 10-90°C (50-194°F)
Fuel Used Since Last DPF Regeneration Exh. Liters/Gallons 3.78/1 (1 regen complete)
Glow Plug Command Eng, Ind. ON/OFF OFF
High Idle Switch Eng. Spd. On/Off Off
IAF Valve Learned Minimum Ind. % 100
IAF Valve Position EGR, Exh., Ind. % 100
IAF Valve Pos. Sensor Ind. Volts 4-5 Volts
IAT Sensor 1 Eng 1, EGR, TC, FF/FR °C/°F 10-90°C (50-194°F) (temperatures may increase under heavy engine loads)
IAT Sensor 2 Eng 1, EGR, TC, FF/FR °C/°F 10-90°C (50-194°F) (temperatures may increase under heavy engine loads)
Ignition Accessory Signal Eng, Eng. Spd. ON/OFF OFF
Ignition 1 Signal Eng 1, EGR, FF/FR Volts battery voltage (accuracy +/-0.4 volts)
Ignition 1 Signal All Volts 12-14
Injection Pump CAM Reference Signal Missed Eng. Pos., Fuel Counts 0
Injector Timing Eng, Fuel ° -
Intake Air Heater Command Exh., Ind. % 0
Intake Air Heater Command Ind. ON/OFF OFF
MAF Sensor Ind. Hz 2400-1700
MAP Sensor Eng, Ind Grams Varies
Misfire Current Cyl. 1 Mis. Counts 0
Misfire Current Cyl. 2 Mis. Counts 0
Misfire Current Cyl. 3 Mis. Counts 0
Misfire Current Cyl. 4 Mis. Counts 0
Misfire Current Cyl. 5 Mis. Counts 0
Misfire Current Cyl. 6 Mis. Counts 0
Misfire Current Cyl. 7 Mis. Counts 0
Misfire Current Cyl. 8 Mis. Counts 0
Particulate Filt. Pressure Variance Eng. Spd., Exh., Ind. kPa 0.0-3.5
Pilot Inj. Cyl. 1-8 Command Eng On/Off On
PNP Switch Eng In Gear/Park/Neutral Park/Neutral
Reduced Engine Power Cyl. Dea., Eng. Spd., Fuel Inactive, Active Inactive
Start up ECT Cool °C/°F Varies (ECT at time of engine startup)
Start Up Fuel Temperature Fuel °C/°F Varies
Start up IAT Cool °C/°F Varies (IAT at time of engine startup)
TC Vane Position Lrn. this run cycle Ind Yes/No Yes
TC Vane Position Lrn. Since DTC Clear Ind Yes/No Yes
TC Vane Position Sensor Ind % 70-100
TC Vane Position Sensor Ind. Volts 2-4
TC Vane Pos. Ctrl. Solenoid Ind DC 40-50
TCC/Cruise Brake Pedal Switch Eng Applied/Released Released
Vehicle Speed Sensor All mph/km/h 0
Warm-ups Since DTC Cleared Eng Counts 1
Warm-ups w/o Emission Faults Eng Counts 0
Warm-ups w/o Non-Emission Faults Eng Counts 0
Water In Fuel Sensor Fuel Water/ No Water No Water
Water In Fuel Sensor Fuel Volts 0.21-4.75
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.