HELP! I have a 1991 Volvo 240DL wagon. Great shape. Except that her "check engine" light is on. I met another Volvo enthusiast today in a parking lot who was also driving my same model car. (fluke thing) He told me to crack the hood open. He looked at the code sensor (or whatever it's called ) and I got a 221 and 231 reading.
What do these numbers mean? How bad is this news???
She does not start up easily in the morning. I have to let her warm up. She will "jerk" a bit until she has been driving for about 5 minutes or so. Is this related to the code reading?
How soon should I get this fixed?
Thanks in advance! I LOVE MY VOLVO!!!!!!!!!!!!
Chick HELP! 1991 240DL Service Code 221 & 231
**Codes below
System Overview - System Components
The fuel system consists of an air mass meter, commonly referred to as MAF sensor, an oxygen sensor, a throttle body, fuel injectors (one per cylinder) and a catalytic converter.
The Mass Air Flow (MAF and often referred to as air mass meter) is responsible for measuring instantaneous airflow into the engine. In LH, the MAF consists of a wire that is heated with an electrical current and cooled in proportion to the air flowing over it. The sensor measures how much power is required to keep the hot wire at its prescribed temperature and that tells the fuel management system how much air is flowing into the engine. The wire should remain clean so, when the engine is turned off a relay is activated for a preset time and the wire is super heated to burn off any dirt.
The Heated Oxygen Sensor (H02S), located in the hot exhaust gas stream, analyses the gas content of the exhaust and reports the content to the control computer. This sensor operates only above a certain temperature and therefore its readings are disregarded for a short period of time following engine startup.
The Throttle Body is the fuel injection equivalent of the throttle in a carburetor. It is responsible for regulating the flow of air (and therefore the flow of fuel) into the engine. The idle switch signals the computer when the throttle is closed and the Idle Air Control (IAC) valve should be activated.
The Idle Air Control valve is an electronically controlled valve that allows relatively small amounts of intake air into the engine. This is used only when the idle switch on the throttle body signals that the throttle is closed. This system allows the engine control computer to maintain a precise idle speed regardless of engine condition and load.
The Throttle Position Sensor, or TPS, is located on the throttle body at one end of the throttle shaft. It signals the computer when the throttle is either closed (IAC can be activated) or fully open.
The Fuel Injectors, not surprisingly, inject fuel into the stream of intake air, normally immediately before the intake valve.
The Fuel Pressure Regulator maintains a precise fuel pressure on the fuel rail supplying the injectors. The fuel pump attempts to deliver fuel at a fixed rate, so the excess is returned to the fuel tank via a dedicated return line.
The Catalytic Converter is an element of the exhaust system located relatively close to the engine. It is responsible for breaking down the unwanted by-products of combustion, such as carbon monoxide, hydrocarbons and nitrogen oxides.
The Coolant Temperature Sensor monitors the temperature of the engine coolant and thus the operating temperature of the engine.
The Engine Speed Sensor (ESS), Impulse Sensor or RPM sensor is a sensor that actually determines the position of the crankshaft as it rotates. The sensor is more correctly named the Crankshaft Position Sensor, as speed can be derived from angle, but angle cannot be derived from speed. This sensor is responsible for synchronising fuel and ignition.
1-1-1 No fault detected
1-1-2 Control module fault
1-1-3 Short term fuel trim (Lambda control) too lean/rich
1-2-1 MAF sensor signal absent or faulty LH 2.4
1-2-1 MAF sensor signal absent or faulty LH 3.1
1-2-3 ECT signal absent or faulty
1-3-1 Engine speed signal from 01 system absent on starting
1-3-2 Battery voltage too low or too high
1-3-3 TP switch signal faulty at idling LH 2.4
2-1-2 HO2S signal absent or faulty
2-1-3 TP switch signal faulty at full load LH 2.4
2-2-1 Adaptive fuel trim too lean in part-load range
2-2-3 IAC valve signal absent or faulty
2-3-1 Adaptive fuel trim too lean or too rich in part-load range
2-3-2 Adaptive fuel trim too lean or too rich at idling
3-1-1 Speedometer signal absent
3-1-2 No knock enrichment signal from 01 system
3-2-2 MAF sensor burn off signal absent or faulty LH 2.4
4-1-1 Throttle position sensor signal absent or faulty LH 3.1
System Overview - System Components
The fuel system consists of an air mass meter, commonly referred to as MAF sensor, an oxygen sensor, a throttle body, fuel injectors (one per cylinder) and a catalytic converter.
The Mass Air Flow (MAF and often referred to as air mass meter) is responsible for measuring instantaneous airflow into the engine. In LH, the MAF consists of a wire that is heated with an electrical current and cooled in proportion to the air flowing over it. The sensor measures how much power is required to keep the hot wire at its prescribed temperature and that tells the fuel management system how much air is flowing into the engine. The wire should remain clean so, when the engine is turned off a relay is activated for a preset time and the wire is super heated to burn off any dirt.
The Heated Oxygen Sensor (H02S), located in the hot exhaust gas stream, analyses the gas content of the exhaust and reports the content to the control computer. This sensor operates only above a certain temperature and therefore its readings are disregarded for a short period of time following engine startup.
The Throttle Body is the fuel injection equivalent of the throttle in a carburetor. It is responsible for regulating the flow of air (and therefore the flow of fuel) into the engine. The idle switch signals the computer when the throttle is closed and the Idle Air Control (IAC) valve should be activated.
The Idle Air Control valve is an electronically controlled valve that allows relatively small amounts of intake air into the engine. This is used only when the idle switch on the throttle body signals that the throttle is closed. This system allows the engine control computer to maintain a precise idle speed regardless of engine condition and load.
The Throttle Position Sensor, or TPS, is located on the throttle body at one end of the throttle shaft. It signals the computer when the throttle is either closed (IAC can be activated) or fully open.
The Fuel Injectors, not surprisingly, inject fuel into the stream of intake air, normally immediately before the intake valve.
The Fuel Pressure Regulator maintains a precise fuel pressure on the fuel rail supplying the injectors. The fuel pump attempts to deliver fuel at a fixed rate, so the excess is returned to the fuel tank via a dedicated return line.
The Catalytic Converter is an element of the exhaust system located relatively close to the engine. It is responsible for breaking down the unwanted by-products of combustion, such as carbon monoxide, hydrocarbons and nitrogen oxides.
The Coolant Temperature Sensor monitors the temperature of the engine coolant and thus the operating temperature of the engine.
The Engine Speed Sensor (ESS), Impulse Sensor or RPM sensor is a sensor that actually determines the position of the crankshaft as it rotates. The sensor is more correctly named the Crankshaft Position Sensor, as speed can be derived from angle, but angle cannot be derived from speed. This sensor is responsible for synchronising fuel and ignition.
1-1-1 No fault detected
1-1-2 Control module fault
1-1-3 Short term fuel trim (Lambda control) too lean/rich
1-2-1 MAF sensor signal absent or faulty LH 2.4
1-2-1 MAF sensor signal absent or faulty LH 3.1
1-2-3 ECT signal absent or faulty
1-3-1 Engine speed signal from 01 system absent on starting
1-3-2 Battery voltage too low or too high
1-3-3 TP switch signal faulty at idling LH 2.4
2-1-2 HO2S signal absent or faulty
2-1-3 TP switch signal faulty at full load LH 2.4
2-2-1 Adaptive fuel trim too lean in part-load range
2-2-3 IAC valve signal absent or faulty
2-3-1 Adaptive fuel trim too lean or too rich in part-load range
2-3-2 Adaptive fuel trim too lean or too rich at idling
3-1-1 Speedometer signal absent
3-1-2 No knock enrichment signal from 01 system
3-2-2 MAF sensor burn off signal absent or faulty LH 2.4
4-1-1 Throttle position sensor signal absent or faulty LH 3.1
89 240dl aka "The Chill Factor 5000"
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