Components
F60: Idle switch
G4: Reference point sensor
G6: Fuel pump
G28: Reference 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
G74: CO Potentiometer
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
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
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Throttle Valve Potentiometer G69
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The throttle valve potentiometer is connected to the throttle shaft and is supplied
five volts by the MPI control unit. The MPI control unit receives a varying voltage signal
from the potentiometer as the throttle position changes.
The voltage signal it supplies the MPI control unit is used to determine the position of
the throttle plates and the speed of throttle movement. This information is used for:
- Acceleration enrichment
- Full throttle enrichment
The throttle valve potentiometer is also used as a substitute signal for the air mass
sensor (G70).
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Substitute Function
No substitute function is available for the throttle valve potentiometer.
Self-diagnosis
The ECU recognizes the following fault conditions of the throttle potentiometer:
- An open circuit
- The ECU checks the plausibility of the signal by comparing it to the signal
of the air mass sensor (G70).
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