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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 		 
Coolant Temperature Sensor G62
G62
The coolant temperature sensor is located on the coolant pipe in back of the left cylinder head.
The coolant temperature is an NTC resistor. The electrical resistance of the sensor decreases as the coolant temperature increases.

The coolant temperature information is used by the MPI control unit as a correction factor for the following:
  • Cold start enrichment
  • Correction to injection and ignition timing for cold engine
  • Idle speed control
  • Deceleration fuel shut-off

The coolant temperature sensor is also used to activate certain systems at a predetermined temperature such as:
  • Oxygen sensor control
  • Knock control
  • Exhaust gas recirculation
G62
Substitute Function

If the control unit detects a fault in the coolant temperature sensor or wiring, it assumes a temperature of 68°F (20°C) when the engine is first started.

18°F (10°C) is added per minute of engine operation until the maximum temperature of 185°F (85°C) is reached.

Self-diagnosis

The ECU recognizes the following fault conditions of the coolant temperature sensor:
  • An open circuit
  • A short circuit
  • Implausible signal
 
 
 
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