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MMS-3xx Functional Wiring Diagram

Components


F60: Idle switch
G4: Crankshaft Position Sensor
G6: Fuel pump
G28: Engine Speed Sensor
G39: Oxygen sensor I
G40: Hall Sensor
G61: Knock sensor I
G62: Engine Coolant Temperature (ECT) sensor
G66: Knock sensor II
G69: Throttle valve potentiometer
G70: Mass Air Flow (MAF) sensor
G98: Exhaust Gas Recirculation (EGR) temperature sensor
G108: Oxygen sensor II
J176: Fuel pump relay
J192: Engine Control Module (ECM)
N: Ignition coil for cylinders 1 and 6
N18: EGR frequency valve
N30: Fuel injector, cylinder 1
N31: Fuel injector, cylinder 2
N32: Fuel injector, cylinder 3
N33: Fuel injector, cylinder 4
N71: Idle Air Control (IAC) valve
N80: EVAP carbon canister frequency valve
N83: Fuel injector, cylinder 5
N84: Fuel injector, cylinder 6
N122: Power stage for ignition coils
N128: Ignition coil for cylinders 2 and 4
N156: Intake manifold change-over valve
N158: Ignition coil for cylinders 3 and 5
P: Spark plug connector (6x)
Q: Spark plug (6x)
S17: Fuse for G6
S19: Fuse for diagnostic connector
S64: Circuit breaker for N158, N128, and N
S72: Circuit breaker for N30, N31, N32, N33, N83, and N84
S73: Circuit breaker for G39, G108, N18, N80, and N156
S74: Circuit breaker for G70 and G74

Additional Signals


B8: Throttle valve signal (not pictured)
B9: Road speed signal (not pictured)
B10: Engine speed signal (not pictured)
B11: Fuel consumption signal (not pictured)
B12: Shift lever position signal (not pictured)
B13: Shift point signal (not pictured)
C10: A/C compressor signal (not pictured)
C12: Diagnostic signal for Rapid Data (K circuit)
C13: Diagnostic signal for Rapid Data (L circuit)
C14: Flash code signal 		 
MPI Control Unit
Self-diagnosis Functions

  • Knock control
  • Oxygen sensor control
  • Senders and sender circuits
  • Signal plausibility
  • Actuator circuits
The ECU also provides substitute functions for failed operation and stores faults that have occurred.

Plausibility Checks

The ECU compares signals of some senders with signals from other senders to see if they 'make sense.' For example, the idle switch cannot be checked for an open circuit or short to ground. Therefore, the signal from the idle switch is compared by the ECU with the signal from the throttle valve potentiometer to see if it is logical.

Substitute Functions

If a circuit is interrupted or short circuited, signals at the limits of operating range of the particular sender are supplied to the ECU. However, this could lead to poor driveability and an increase in emissions.

Therefore, substitute values are supplied by the ECU when a fault is recognized. This permits driving performance that is acceptable.

Fault Memory

The fault memory in the ECU recognizes faults and stores them until:
  • The fault memory is erased after the fault has been corrected
  • The fault does not occur for the next 50 engine starts
  • The battery is disconnected
  • The ECU is disconnected
 
 
 
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