Evaluating Measured Value Blocks At Idle
Evaluating Measured Value Blocks, At Idle
Display group 000 at idle with engine warm, coolant temperature above 80 degree C (176 degree F)
Display group 001 at idle with engine warm, coolant temperature not below 80 degree C (176 degree F)
Display Group 001 - Injected Quantity:
Evaluation: Injected quantity display
Evaluation: Modulating piston displacement sensor -G149- voltage display
Display group 002 at idle with engine warm, coolant temperature above 80 degree C (176 degree F)
Dispaly Group 002 - Idle Speed:
Evaluation: "Throttle position" display
Evaluation: "Operating condition" display
Significance of figures in 3-digit number block for engine operating condition:
Display group 003 at idle with engine warm, coolant temperature not below 80 degree C (176 degree F)
Display Group 003 - Exhaust Gas Recirculation (EGR):
Evaluation: Air mass drawn in (specified) display
Evaluation: Air mass drawn in (actual) display
Display group 004 at idle with engine warm, coolant temperature not below 80 degree C (176 degree F)
Display Group 004 - Start Of Injection:
Evaluation: Start of injection (specified) display
Evaluation: Start of injection display (actual)
Display group 005
The values displayed are not useful for service department troubleshooting.
Display Group 005 - Starting Conditions:
Display group 006 with ignition switched on
Display Group 006 - Switch Positions:
Evaluation: Brake pedal monitor display
Significance of figure in 3-digit number block for brake pedal monitor.
Display group 007 with ignition switched on (engine cold and not running)
Display Group 007 - Temperatures:
Evaluation: Fuel temperature display
Evaluation: Intake Air Temperature display
Evaluation: Coolant temperature display
Display group 009
The values displayed are not useful for service department troubleshooting.
Display Group 009 - Injected Quantity Limitation:
Display group 012
The values displayed are not useful for service department troubleshooting.
Display Group 012 - Glow Plug System:
Display group 013 at idle speed with engine warm, coolant temperature above 80 degree C (176 degree F)
Display Group 013 - Idle Speed Smooth Running Control:
Evaluation: idle speed smooth running control display
- The fuel injection system is equipped with an idle speed smooth running control. There may be power differences between the individual cylinders (component tolerances, jet sizes, compressions etc.) which are recognized and equalized via selective injected quantities.
- Recognition at idle speed is via the signal from the Engine Speed Sensor -G28- which delivers four signals per crankshaft revolution to the Engine Control Module (ECM). If the signals are delivered at the same rhythm then all cylinders work the same. If one cylinder is weaker the crankshaft takes longer for the next half revolution. Conversely a more powerful cylinder accelerates the crankshaft so less time is taken.
- If the ECM recognises a difference, then the relevant cylinder is given more or less fuel, until the engine runs evenly again.
- +... mg/H: The relevant cylinder is less powerful than No. 3 cylinder and is therefore supplied with more fuel.
- -... mg/H: The relevant cylinder is more powerful than No. 3 cylinder and is therefore supplied with less fuel.
Display group 015
The values displayed are not useful for service department troubleshooting.
Display Group 015 - Fuel Consumption:
Display group 016 at idle
Display Group 016 - Additional Heater:
Evaluation: Additional heater display
Significance of figures in 8-digit number block for additional heater:
Evaluation: Heater element activation display
Significance of figures in 2-digit or 8-digit number block for heater element activation:
Vehicles with 2-digit number block
Vehicles with 8-digit number block
Display group 19 with ignition on
Display Group 019 - Quantity Adjuster:
Evaluation: Modulating piston displacement sensor -G149- voltage display (start / stop positions)
Display group 000 at Wide Open Throttle (WOT), test drive in 3rd gear, Engine Coolant Temperature 80 degree C (176 degree F) minimum
NOTE:
- When testing, accelerate vehicle at full throttle.
- Measured values must be printed or displayed (2nd person required) when engine speed reaches 3,000 RPM.
- Observe safety precautions when performing test drive.
Display Group 000:
Display group 004 at Wide Open throttle (WOT), test drive in 3rd gear, Engine Coolant Temperature 80 degree C (176 degree F) minimum
NOTE:
- When testing, accelerate vehicle at WOT.
- Measured values must be printed or displayed (2nd person required) when engine speed reaches 3,000 RPM.
- Observe safety precautions when performing test drive.
Display Group 004 - Start Of Injection:
Evaluation: Start of injection (actual) display
Evaluation: Cold start valve duty cycle display
Display group 008 at Wide Open Throttle (WOT), test drive in 3rd gear, Engine Coolant Temperature above 80 degree C (176 degree F)
NOTE:
- When testing, accelerate vehicle at WOT.
- Measured values must be printed or displayed (2nd person required) when engine speed reaches 3,000 RPM.
- Observe safety precautions when performing test drive.
Display Group 008 - Injected Quantity Limitation:
Evaluation: Injected quantity (driver's requirement) display
Evaluation: Injected quantity limitation via RPM (torque limitation) display
Evaluation: Injection quantity limitation due to air mass drawn in (smoke prevention) display
Display group 010 at WOT, test drive in 3rd gear, Engine Coolant Temperature above 80 C (176 F)
NOTE:
- When testing, accelerate vehicle at WOT.
- Measured values must be printed or displayed (2nd person required) when engine speed reaches 3,000 RPM.
- Observe safety precautions when performing test drive.
Display Group 010 - Air Quantities:
Evaluation: Air mass drawn in display
Evaluation: Intake manifold pressure (charge pressure) display
Evaluation: Accelerator pedal position display
Display group 011 at Wide Open Throttle (WOT), test drive in 3rd gear, Engine Coolant Temperature above 80 degree C (176 degree F)
NOTE:
- When testing, accelerate vehicle at WOT.
- Measured values must be printed or displayed (2nd person required) when engine speed reaches 3,000 RPM.
- Observe safety precautions when performing test drive.
Display Group 011 - Charge Pressure Control:
Evaluation: Manifold Absolute Pressure display (actual)
