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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Coolant Temperature Sensor G62
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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
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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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