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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 		 
Oxygen Sensors I and II G39 and G108
G39, G108
The fuel/air mixture is regulated seperately for right and left cylinder banks. Each cylinder bank has its own heated oxygen sensor.

In addition, each cylinder bank has its own catalytic converter.

The use of two oxygen sensors allows the MPI control unit to monitor the oxygen content in each cylinder bank individually.

The advantage of using two catalytic converters is that the exhaust gas flow speed in the catalytic converter is reduced. This increases the time that exhaust gases spend in contact with the catalyst.

The MPI control unit regulates the amount of fuel injected per cylinder bank based on the voltage signals received from the respective oxygen sensors.
G39, G108
Substitute Function

No substitute functions are available for the oxygen sensors.

Self-diagnosis

The ECU recognizes the following faults:
  • A short circuit to positive/open circuit
  • A short circuit to ground
  • A missing signal
  • Rich limit exceeded
  • Lean limit exceeded
 
 
 
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