Self Diagnostics - Theory And Operation (N62)

• 9. OBD System Description Of BOSCH Ecu Me9.2.2
  • Notes
  • 9.1 Catalyst Monitoring
    • Notes
    • 9.1.1 System overview and catalyst diagnosis structure
    • 9.1.2 Quick pass check
    • 9.1.3 Main Catalyst check
    • 9.1.4 In-use monitoring performance ratio (IUMPR)
  • 9.2 Misfire Monitoring
    • Notes
    • 9.2.1 Correction of the segment time ts(n) (%DMDFOF, see )
    • 9.2.2 Correction of the engine roughness value luts (%DMDFON, see ):
    • 9.2.3 Fuel-on correction of the engine roughness values luts, fluts and dluts (%DMDLFK)
    • 9.2.4 Misfire detection by Luts-Method (%DMDLU, see )
    • 9.2.5 Misfire detection by Dluts-Method (%DMDDLU, see )
    • 9.2.6 Misfire detection by Fluts-Method (%DMDLUA, see )
    • 9.2.7 Fault handling and misfire statistics (%DMDMIL)
    • 9.2.8 Fault Handling
    • 9.2.9 Emissions Relevant Misfires
      • Notes
      • 9.2.9.1 Emissions Relevant Misfires after Engine Start
      • 9.2.9.2 Emissions Relevant Misfires during Driving Cycle
      • 9.2.9.3 Catalyst Damaging Misfires
    • 9.2.10 Deactivation of the misfire detection (%DMDSTP)
  • 9.3 Evaporative Purge System Monitoring
    • 9.3.1 Evaporative System Leak Measurement
      • 9.3.1.1 General Description of Leak Measurement
        • Notes
        • 9.3.1.1.1 Diagnosis Frequency and MIL illumination: leak > 0.04 inches
        • 9.3.1.1.2 Diagnosis Frequency and MIL illumination: Rough leak counter > threshold: leak > 0.02 inches
      • 9.3.1.2 In-use monitor performance ratio (IUMPR)
      • 9.3.2 Evaporative Purge System - Canister Purge Valve (CPV)
      • 9.3.2.1 Diagnosis of Canister Purge Valve (CPV) (under driving conditions):
  • 9.4 Fuel Level Sensor
    • Notes
    • 9.4.1 Fuel Level Sensor circuit continuity check
    • 9.4.2
    • 9.4.3 FLS diagnosis frequency FLS circuit continuity check
    • 9.4.4 FLS diagnosis frequency FLS signal rationality check (plausibility error)
  • 9.5 Positive Crankcase Ventilation System (PCV)
    • 9.5.1 General description of the PCV-System:
    • 9.5.2 Diagnosis of a leakage in the PCV-System:
  • 9.6 Secondary Air Injection System
    • Notes
    • 9.6.1 AIR System
      • Notes
      • 9.6.1.1 Basic diagnosis activities during injection of secondary air
      • 9.6.1.2 Basic diagnosis activities after stop of injection of secondary air
    • 9.6.2 Passive check
    • 9.6.3 In-use monitoring performance ratio (IUMPR)
  • 9.7 Engine Off Timer Counter
    • Notes
    • 9.7.1 CAN Signal check
    • 9.7.2 Rationality Check
  • 9.8 Ambient Air Temperature
    • Notes
    • 9.8.1 CAN Signal Check
    • 9.8.2 Range Check
    • 9.8.3 Rationality Check
  • 9.9 Atmospheric Pressure Sensor
    • Notes
    • 9.9.1 Circuit continuity
    • 9.9.2 Range check
    • 9.9.3 Rationality check
  • 9.10 Fuel System Monitoring
    • Notes
    • 9.10.1 Fuel injection calculation
    • 9.10.2 Fuel trim adaptation
    • 9.10.3 Fuel system diagnosis
      • Notes
      • 9.10.3.1 Similar conditions
      • 9.10.3.2 Diagnosis of Fuel Detection of Empty Fuel Tank
    • 9.10.4 Fuel System - Summary Error
    • 9.10.5 Fuel Rail Pressure Sensor
      • 9.10.5.1 Diagnosis of Fuel Rail Pressure Sensor General Description
  • 9.11 Oxygen Sensor Monitoring
    • 9.11.1 Upstream HO2S Heater
    • 9.11.2 Heater upstream O2 Sensor (UEGO)
    • 9.11.3 Heater Influence on upstream HO2S
    • 9.11.4 Plausibility check of the upstream HO2S
      • Notes
      • 9.11.4.1 Four types of faults can be detected
        • Notes
        • 9.11.4.1.1 Maximum fault
        • 9.11.4.1.2 Minimum fault
        • 9.11.4.1.3 Plausibility fault
        • 9.11.4.1.4 Signal fault
        • 9.11.4.1.6 In-Use Monitor Performance Ratio (IUMPR)
        • 9.11.4.1.7 Inhibiting faults
    • 9.11.5 Aging of upstream HO2S
    • 9.11.6 Monitoring of HO2S Voltage
    • 9.11.7 Swapped Upstream HO2S
    • 9.11.8 Evaluation IC of the upstream HO2S
      • Notes
      • 9.11.8.1 Open Circuit - VM line interruption:
      • 9.11.8.2 Open Circuit - UN line interruption:
      • 9.11.8.3 Open Circuit - IA line interruption:
      • 9.11.8.4 Open Circuit - IP line interruption:
        • Notes
        • 9.11.8.4.1 Detection during fuel cut-off condition
        • 9.11.8.4.2 Detection by mixture enrichment or lean-off
        • 9.11.8.4.3 Detection by closed-loop control to a nominal A/F value that differs from 1
      • 9.11.8.5 Short circuits to ground or to battery voltage
      • 9.11.8.6 Monitoring of the communication between the Evaluation-IC CJ125 and the Micro-controller of the PCM
        • 9.11.8.6.1 Non-plausible commands counter
        • 9.11.8.6.2 Low supply voltage of the CJ125 IC
        • 9.11.8.6.3 Electrical trimming
    • Downstream HO2S Monitor
      • Notes
      • 9.11.9.1 Wire Interruption or Defective Sensor Heating
      • 9.11.9.2 Short circuit of HO2S' signal line to battery
      • 9.11.9.3 Short Circuit to Ground
    • 9.11.10 Heater of downstream HO2S
      • Notes
      • 9.11.10.2 Diagnosis of the Internal Resistance of the Nernst Cell
      • 9.11.10.3 Power Stage Diagnosis
    • 9.11.11 Aging of downstream HO2S
      • Notes
      • 9.11.11.1 Oscillation Check
      • 9.11.11.2 Threshold Check during trailing throttle Fuel Cutoff
    • 9.11.12 Monitoring of the Oxygen Sensor's response rate
  • 9.12 Electrical Fault On Upstream Oxygen Sensor
  • 9.13 Mass Air Flow Sensor
    • Notes
    • 9.13.1 Circuit continuity
    • 9.13.2 Rationality check
  • 9.14 Engine Coolant Temperature (ECT) Sensor
    • Notes
    • 9.14.1 Circuit continuity checks
    • 9.14.2 Rationality checks
  • 9.15 Thermostat Monitoring
    • 9.15.1 Description of the thermostat monitoring strategy
    • 9.15.2 Thermostat opens and closes normally
    • 9.15.3 Thermostat is stuck open
  • 9.16 Radiator Outlet (ECT) Sensor
    • Notes
    • 9.16.1 Circuit continuity checks
    • 9.16.2 Rationality checks
  • 9.17 Vehicle Speed
    • Notes
    • 9.17.1 Range Check
    • 9.17.2 Rationality Check
    • 9.17.3 Intake Air Temperature (IAT) Sensor
    • 9.17.4 Circuit continuity checks
    • 9.17.5 Rationality checks
  • 9.18 Variable Camshaft Timing (BMW-VANOS)
  • 9.19 VALVETRONIC
    • 9.19.1 Valvetronic Module
      • Notes
      • 9.19.1.1 General description of this module:
    • 9.19.2 Valvetronic Power Supply
      • 9.19.2.1 Description and diagnosis of this module:
    • 9.19.3 Valvetronic Power Stage
      • 9.19.3.1 General description of this module:
    • 9.19.4 Valvetronic (limp-home)
      • 9.19.4.1 Description and diagnosis of this module:
  • Camshaft Position Sensor
    • 9.20.1 Engine speed sensor and camshaft position (CMP) sensor
    • 9.20.2 Diagnosis by counting the CMP sensor signal edges
  • 9.21 Engine Speed Sensor
    • 9.21.1 Engine speed sensor and camshaft position (CMP) sensor
    • 9.21.2 Diagnosis by monitoring if the RPM sensor signal is partly interrupted
    • 9.21.3 Diagnosis by monitoring the camshaft position sensor (CMP) signal
    • 9.21.4 Diagnosis by monitoring the engine speed sensor reference gap
  • 9.22 Throttle Position Sensor
  • 9.23 Throttle Adjustment Device By DLR
    • Notes
    • 9.23.1 Diagnosis of non-permissible deviations between requested and actual throttle position
    • 9.23.2 Duty cycle range check
    • 9.23.3 Throttle valve power stage check
  • 9.24 Diagnosis Of The Throttle Body
    • Notes
    • 9.24.1 Return spring check
  • 9.25 Knock Sensor
    • Notes
    • 9.25.1 Monitoring via the CC196 IC
    • 9.25.2 Monitoring via reference signal
  • 9.26 Knock Control Circuit
    • Notes
    • 9.26.1 Pulse Test
    • 9.26.2 Zero Test
    • 9.26.3 Parity check
    • 9.27 Knock Control SPI Monitoring
  • 9.28 Idle Speed Control (ISC)
  • 9.29 Can Diagnosis
    • 9.29.1 Power train CAN A and CAN C
    • 9.29.2 Diagnosis of Local CAN B Data
    • 9.29.3 CAN Data Bus - VVT communication General Description - Automatic Transmission
    • 9.29.4 CAN Data Bus - TCM communication General Description - Automatic Transmission
    • 9.29.5 CAN Data Bus - TCM communication General Description - Sequential Manual Transmission
  • 9.30 Identification Of The Communication Protocol Utilized By Test Group 6BMXT04.8N62 For Communication With An Sae J1978 Scan Tool
  • 9.31 Listing Of All Electronic Power Train Input And Output Signals
    • 9.31.1 Input and Output signals of the Engine Control Unit (ECU) ME9.2.2
  • 9.32 Output Stages CJ94X/Cy31X/TLE6232
    • 9.32.1 General Description
  • 9.33 IUMPR Kernel Function
    • Notes
    • 9.33.1 Ignition cycle counter
    • 9.33.2 General denominator
    • 9.33.3 IUMPR - Records
    • 9.33.4 Incrementing the numerator and denominator
    • 9.33.5 Minimum ratio selection (multiple monitors)
  • 9.34 Location Of The Data Link Connector For Test Group 6BMXT04.8N62 (Models X5 4.4, X5 4.8IS)
  • 9.35 Drawing And Location Of The Malfunction Indicator Light For Test Group 6BMXT04.8N62 (Models X5 4.4, X5 4.8IS)
  • 9.36 Calculated Load And Fuel Trim Determination