160....O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 2)
P0161....O2 Sensor Heater Circuit (Bank 2 Sensor 2)
P0162....O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)
P0163....O2 Sensor Circuit Low Voltage (Bank 2 Sensor 3)
P0164....O2 Sensor Circuit High Voltage (Bank 2 Sensor 3)
P0165....O2 Sensor Circuit Slow Response (Bank 2 Sensor 3)
P0166....O2 Sensor Circuit No Activity Detected (Bank 2 Sensor 3)
P0167....O2 Sensor Heater Circuit (Bank 2 Sensor 3)
P0168....Fuel Temperature Too High
P0169....Incorrect Fuel Composition
P0170....Fuel Trim (Bank 1)
P0171....System too Lean (Bank 1)
P0172....System too Rich (Bank 1)
P0173....Fuel Trim Malfunction (Bank 2)
P0174....System too Lean (Bank 2)
P0175....System too Rich (Bank 2)
P0176....Fuel Composition Sensor Circuit
P0177....Fuel Composition Sensor Circuit Range/Performance
P0178....Fuel Composition Sensor Circuit Low Input
P0179....Fuel Composition Sensor Circuit High Input
P0180....Fuel Temperature Sensor A Circuit
P0181....Fuel Temperature Sensor A Circuit Range/Performance
P0182....Fuel Temperature Sensor A Circuit Low Input
P0183....Fuel Temperature Sensor A Circuit High Input
P0184....Fuel Temperature Sensor A Circuit Intermittent
P0185....Fuel Temperature Sensor B Circuit
P0186....Fuel Temperature Sensor B Circuit Range/Performance
P0187....Fuel Temperature Sensor B Circuit Low Input
P0188....Fuel Temperature Sensor B Circuit High Input
P0189....Fuel Temperature Sensor B Circuit Intermittent
P0190....Fuel Rail Pressure Sensor Circuit
P0191....Fuel Rail Pressure Sensor Circuit Range/Performance
P0192....Fuel Rail Pressure Sensor Circuit Low In put
P0193....Fuel Rail Pressure Sensor Circuit High Input
P0194....Fuel Rail Pressure Sensor Circuit Intermittent
P0195....Engine Oil Temperature Sensor
P0196....Engine Oil Temperature Sensor Range/Performance
Cooling Fan Switch
Engine Temperature Sensor
Temperature Switch
Fig. Remove the coolant temperature sensor
The coolant temperature gauge sensor is a temperature-variable resistor, or thermistor. As coolant temperature increases, the resistance of the sensor decreases or decreases, depending on the type of sensor.
A1 and A2 platforms use a different type of circuit that A3 vehicles. On A1 and A2 vehicles, the circuit is a "resistance to ground" type. A3 vehicles use a "variable voltage" type, where a voltage is supplied to the sensor. Because of the circuitry design on A3 vehicles, testing of the coolant temperature gauge is limited.
The engine coolant temperature gauge uses a heat sensitive sending unit to transmit an electrical signal to the gauge. The sending unit is a heat sensitive variable resistor that is located on or near to the cylinder head and threads into an engine coolant passage. The sensors are a Negative Temperature Coefficient (NTC) type. As the temperature increases, the electrical resistance of the sensor decreases. As the coolant temperature changes, so does the resistance of the sensor. The gauge is calibrated within the operating range of the sensor and interprets the resistance value to display the coolant temperature.
Beginning with model year 1994, the engine coolant gauge and the Engine Control Module (ECM) temperature sensors were combined into one sensor with 4 terminals. The basic operation remains the same in that their resistance decreases as the coolant temperature increases, however the actual resistance values of the 2 sensor circuits are different. The electrical connector of the 4-wire terminal sensor ( 1 and 2 ) is keyed to prevent improper connection of the sensor's electrical circuit.
Fig. Beginning with model year 1994, the Engine Coolant Temperature Sensors combined the sensors for the ECM and the gauge into one sensor-1997 2.8L V6 sensor shown
Fig. The electrical connector for the combined temperature sensors is keyed to avoid improperly connecting the sensor's wiring-1997 2.8L V6 connector shown
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