Diagnostic Starting Point - Engine Controls
Begin the system diagnosis with Diagnostic System Check - Vehicle . The Diagnostic System Check - Vehicle will provide the following information
- The identification of the control modules which command the system
- The ability of the control modules to communicate through the serial data circuit
- The identification of any stored diagnostic trouble codes (DTCs) and the codes' statuses
The use of the Diagnostic System Check - Vehicle will identify the correct procedure for diagnosing the system and where the procedure is located.
Scan Tool Data List (Engine Control Module)
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
| 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 | Mm 3 | 4.0 to +4.0 |
| BARO | Eng, EGR, FF/FR | KPa | 65-104 (Varies with altitude) |
| Base Injector Fuel Rate | Eng Fuel | Mm 3 | 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 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 |
Scan Tool Data List
Scan Tool Data List (Glow Plug Control Module)
The GPCM Scan Tool Data List contains all glow plug control module related parameters that are available on the scan tool. The list is arranged in alphabetical order.
Use the GPCM 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 GPCM 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. |
| Scan Tool Parameter | Units Displayed | Typical Data Value |
|---|---|---|
| Operating Conditions: Engine Idling/Lower Radiator Hose Hot/Closed Throttle/Park or Neutral/Accessories Off | ||
| Glow Plug | Volts | 14 |
| Glow Plug 1-8 | Amps | 19-21 |
| Glow Plug 1-8 | Ohms | 0.49-0.90 |
| Glow Plug Driver Open | OK/Fault | OK |
| Glow Plug Driver Shorted | OK/Fault | OK |
| Glow Plug Overtemp | OK/Fault | OK |
| Glow Plug Overvoltage | OK/Fault | OK |
| Glow Plug Undervoltage | OK/Fault | OK |
| IA Heater Driver Current | OK/Fault | OK |
| IA Heater Driver Grounded | OK/Fault | OK |
| IA Heater Driver Open | OK/Fault | OK |
| IA Heater Driver Shorted | OK/Fault | OK |
| IA Heater Overtemp | OK/Fault | OK |
| IA Heater Overvoltage | OK/Fault | OK |
| IA Heater Undervoltage | OK/Fault | OK |
| Ignition 1 Signal | Volts | Battery Voltage |
| Intake Air Heater | Volts | 11-13.2 |
| Intake Air Heater | % | 0 |
Scan Tool Data List
Scan Tool Data Definitions
The Engine Control Module Scan Tool Data Definitions contains a brief description of all engine control module (ECM) related parameters available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists. In some cases, the parameter may appear more than once or in more than one data list in order to group certain related parameters together.
Scan Tool Output Controls
| Scan Tool Output Control | Additional Menu Selection(s) | Description |
|---|---|---|
| Balance Rate Monitor | Fuel System | This function will allow actual balance rate values to be displayed. |
| Cylinder Power Balance | Fuel System | Disables each fuel injector. Device Control can be changed at any engine or vehicle speed. The device control will not change unless changed or cancelled by the scan tool. |
| DPF Regeneration Enable | Exh. | This function enables a DPF Regen when the vehicle meets the conditions for running. This function will by-pass the normal soot model, so the next time the vehicle is under the conditions for an active regeneration to take place, the ECM will go ahead and initiate the regeneration event. |
| DPF Reset Replace DPF | Output Controls | Resets all DPF parameters to zero. |
| DPF Service Regeneration | Exh. | This function enables a DPF Regen. The engine coolant must be greater than 70-115°C (158-239°F). Vehicle must be in Park. Ambient temperature must be greater than -30°C (-22°F). Brake pedal and accelerator must be in the released position. The scan tool will display all inhibit reasons. The scan tool must remain connected until test is complete. This function takes approximately 35 minutes to complete. During this procedure the RPM will slowly increase to 2,500 RPM and remain there for approximately 25 minutes. |
| EGR Solenoid | Output Controls | Activates the exhaust gas recirculation (EGR) solenoid ON or OFF. The EGR position is limited to 40 percent duty cycle, which is 100 percent commanded open valve. The device control is limited to 10 seconds ON, with a 10 second OFF cooling time. This device control is disabled by DTC P0403. |
| Engine Speed Control | Special Functions/Engine Speed/Throttle | Adjusts the engine speed in 25, 100, or 500 RPM increments between 600-1500 RPM. The Device Control will not change unless changed or cancelled by the scan tool. |
| Fuel Pressure Control | Fuel System | Changes the Fuel Pressure in 5 MPa increments from 30-160 MPa. The Device Control will not change unless changed or cancelled by the scan tool. This device control is disabled if any of the following conditions are met: Engine speed is more than 2500 RPM. Vehicle Speed is more than 40 km/h (25 mph). |
| Fuel Pump | Engine Output Controls | Activates the fuel transfer pump or prime pump (depending on application) ON or OFF. The Device Control will not change unless changed or cancelled by the scan tool. |
| Fuel Transfer Pump Relay | Fuel System | This function commands the fuel transfer pump relay ON/OFF. |
| IAF Valve Motor | Ind. | This function increases or decreases the position of the IAF valve. |
| Malfunction Indicator Lamp | Output Controls | Activates the malfunction indicator lamp (MIL). The MIL will remain illuminated until cancelled by the scan tool. |
| Pilot Injector Balance Procedure | Fuel System | Disables each fuel injector pilot injection. Device Control can be changed at any engine or vehicle speed. The device control will not change unless changed or cancelled by the scan tool. |
| TC Vane Position Sensor | Output Controls | Adjusts the turbocharger vane position in 5 percent increments from 0-100 percent. The device control will be aborted if engine speed is above idle or if the coolant temperature is too cold. |
| TC Vane Solenoid | Output Controls | Cycles the turbocharger vane position solenoid to 100 percent boost and back to 0 percent boost. The device control is limited to engine speeds less than 1,500 RPM and will be disabled if DTC P0045 is set. |
Scan Tool Output Controls
See also:
• Diagnostic System Check - Vehicle