Computer Codes?
Thread Starter
Heel & Toe
Joined: Jan 2008
Posts: 16
Likes: 0
From: Flat Rock MI
Computer Codes?
Hey guys,
Just wondering if anyone could tell me what a 14 and a 44 is as far as the codes I got when I checked them. Actually a friend came over and did something to get the "service engine" light to flash, (Im no tech).
It came back flashing a 14 and a 44.
Thanks,
JT
Just wondering if anyone could tell me what a 14 and a 44 is as far as the codes I got when I checked them. Actually a friend came over and did something to get the "service engine" light to flash, (Im no tech).
It came back flashing a 14 and a 44.
Thanks,
JT
Instructor
Joined: Mar 2007
Posts: 173
Likes: 18
From: Edinburgh Midlothian
hope this helps
Code DTC 44
CIRCUIT DESCRIPTION:
The Electronic Control Module (ECM) supplies a voltage of about 0.45 volt between terminals "D6" and "D7". (If measured with a 10 megohm digital voltmeter, this may read as low as 0.32 volt.) The 02 sensor varies the voltage within a range of about 1 volt if the exhaust is rich, down through about 0.10 volt if exhaust is lean. The sensor is like an open circuit and produces no voltage when it is below about 316~C (600~F) An open sensor circuit or cold sensor causes "Open Loop" operation.
NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
Code 44 is set when the 02 sensor signal voltage on CKT 412 remains below 0.2 volt for 2O seconds and the system is operating in "Closed Loop".
DIAGNOSTIC AIDS:
Using the "Scan", observe the block learn values at different rpm and air flow conditions. The "Scan" also displays the block cells, so the block learn values can be checked in each of the cells to determine when the Code 44 may have been set. If the conditions for Code 44 exists the block learn values will be around 150.
02 Sensor Wire. Sensor pigtail may be mis-positioned and contacting the exhaust manifold. Check for intermittent ground in wire between connector and sensor.
Mass Air Flow (MAF) Sensor. A Mass Air Flow (MAF) sensor output that causes the ECM to sense a lower than normal air flow will cause the system to go lean. Disconnect the MAF sensor and if the lean condition is gone, replace the MAF sensor.
Lean Injector(s). Perform injector balance test CHART C-2A.
Fuel Contamination. Water, even in small amounts, near the in-tank fuel pump inlet can be delivered to the injectors. The water causes a lean exhaust and can set a Code 44.
Fuel Pressure. System will be lean if pressure is too low. It may be necessary to monitor fuel pressure while driving the car at various road speeds and/or loads to confirm, See CHART A-7.
Exhaust Leaks. If there is an exhaust leak, the engine can cause outside air to be pulled into the exhaust and past the sensor. Vacuum or crankcase leaks can cause a lean condition.
AIR System. Be sure air is not being directed to the exhaust ports while "Closed Loop". If the block learn value goes down while squeezing air hose to left side exhaust ports, refer to CHART C-6.
If the above are OK, it is a faulty oxygen sensor.
Code DTC 14
CIRCUIT DESCRIPTION:
The coolant temperature sensor uses a thermistor to control the signal voltage to the Electronic Control Module (ECM). The ECM applies a voltage on CKT 410 to the sensor. When the engine is cold, the sensor (thermistor) resistance is high, therefore the ECM will see high signal voltage. As the engine warms, the sensor resistance becomes less, and the voltage drops. At normal engine operating temperature (85~C to 95~C) the voltage will measure about 1.5 to 2.0 volts.
NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
Code 14 will set if signal voltage indicates a coolant temperature above 130~C (266~C) for 3 seconds.
This test will determine if CKT 410 is shorted to ground which will cause the conditions for Code 14.
DIAGNOSTIC AIDS:
Check harness routing for a potential short to ground in CKT 410. "Scan" tool displays engine temperature in degrees centigrade. After engine is started, the temperature should rise steadily to about 90C then stabilize when thermostat opens. See TESTING PROCEDURES/DIAGNOSIS BY SYMPTOM/INTERMITTENTS.
CIRCUIT DESCRIPTION:
The Electronic Control Module (ECM) supplies a voltage of about 0.45 volt between terminals "D6" and "D7". (If measured with a 10 megohm digital voltmeter, this may read as low as 0.32 volt.) The 02 sensor varies the voltage within a range of about 1 volt if the exhaust is rich, down through about 0.10 volt if exhaust is lean. The sensor is like an open circuit and produces no voltage when it is below about 316~C (600~F) An open sensor circuit or cold sensor causes "Open Loop" operation.
NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
Code 44 is set when the 02 sensor signal voltage on CKT 412 remains below 0.2 volt for 2O seconds and the system is operating in "Closed Loop".
DIAGNOSTIC AIDS:
Using the "Scan", observe the block learn values at different rpm and air flow conditions. The "Scan" also displays the block cells, so the block learn values can be checked in each of the cells to determine when the Code 44 may have been set. If the conditions for Code 44 exists the block learn values will be around 150.
02 Sensor Wire. Sensor pigtail may be mis-positioned and contacting the exhaust manifold. Check for intermittent ground in wire between connector and sensor.
Mass Air Flow (MAF) Sensor. A Mass Air Flow (MAF) sensor output that causes the ECM to sense a lower than normal air flow will cause the system to go lean. Disconnect the MAF sensor and if the lean condition is gone, replace the MAF sensor.
Lean Injector(s). Perform injector balance test CHART C-2A.
Fuel Contamination. Water, even in small amounts, near the in-tank fuel pump inlet can be delivered to the injectors. The water causes a lean exhaust and can set a Code 44.
Fuel Pressure. System will be lean if pressure is too low. It may be necessary to monitor fuel pressure while driving the car at various road speeds and/or loads to confirm, See CHART A-7.
Exhaust Leaks. If there is an exhaust leak, the engine can cause outside air to be pulled into the exhaust and past the sensor. Vacuum or crankcase leaks can cause a lean condition.
AIR System. Be sure air is not being directed to the exhaust ports while "Closed Loop". If the block learn value goes down while squeezing air hose to left side exhaust ports, refer to CHART C-6.
If the above are OK, it is a faulty oxygen sensor.
Code DTC 14
CIRCUIT DESCRIPTION:
The coolant temperature sensor uses a thermistor to control the signal voltage to the Electronic Control Module (ECM). The ECM applies a voltage on CKT 410 to the sensor. When the engine is cold, the sensor (thermistor) resistance is high, therefore the ECM will see high signal voltage. As the engine warms, the sensor resistance becomes less, and the voltage drops. At normal engine operating temperature (85~C to 95~C) the voltage will measure about 1.5 to 2.0 volts.
NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
Code 14 will set if signal voltage indicates a coolant temperature above 130~C (266~C) for 3 seconds.
This test will determine if CKT 410 is shorted to ground which will cause the conditions for Code 14.
DIAGNOSTIC AIDS:
Check harness routing for a potential short to ground in CKT 410. "Scan" tool displays engine temperature in degrees centigrade. After engine is started, the temperature should rise steadily to about 90C then stabilize when thermostat opens. See TESTING PROCEDURES/DIAGNOSIS BY SYMPTOM/INTERMITTENTS.
Thread Starter
Heel & Toe
Joined: Jan 2008
Posts: 16
Likes: 0
From: Flat Rock MI
Can you be a little more.... ummmm presise?
LOL
Thanks Braeburn22!!!
LOL
Thanks Braeburn22!!!
Code DTC 44
CIRCUIT DESCRIPTION:
The Electronic Control Module (ECM) supplies a voltage of about 0.45 volt between terminals "D6" and "D7". (If measured with a 10 megohm digital voltmeter, this may read as low as 0.32 volt.) The 02 sensor varies the voltage within a range of about 1 volt if the exhaust is rich, down through about 0.10 volt if exhaust is lean. The sensor is like an open circuit and produces no voltage when it is below about 316~C (600~F) An open sensor circuit or cold sensor causes "Open Loop" operation.
NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
Code 44 is set when the 02 sensor signal voltage on CKT 412 remains below 0.2 volt for 2O seconds and the system is operating in "Closed Loop".
DIAGNOSTIC AIDS:
Using the "Scan", observe the block learn values at different rpm and air flow conditions. The "Scan" also displays the block cells, so the block learn values can be checked in each of the cells to determine when the Code 44 may have been set. If the conditions for Code 44 exists the block learn values will be around 150.
02 Sensor Wire. Sensor pigtail may be mis-positioned and contacting the exhaust manifold. Check for intermittent ground in wire between connector and sensor.
Mass Air Flow (MAF) Sensor. A Mass Air Flow (MAF) sensor output that causes the ECM to sense a lower than normal air flow will cause the system to go lean. Disconnect the MAF sensor and if the lean condition is gone, replace the MAF sensor.
Lean Injector(s). Perform injector balance test CHART C-2A.
Fuel Contamination. Water, even in small amounts, near the in-tank fuel pump inlet can be delivered to the injectors. The water causes a lean exhaust and can set a Code 44.
Fuel Pressure. System will be lean if pressure is too low. It may be necessary to monitor fuel pressure while driving the car at various road speeds and/or loads to confirm, See CHART A-7.
Exhaust Leaks. If there is an exhaust leak, the engine can cause outside air to be pulled into the exhaust and past the sensor. Vacuum or crankcase leaks can cause a lean condition.
AIR System. Be sure air is not being directed to the exhaust ports while "Closed Loop". If the block learn value goes down while squeezing air hose to left side exhaust ports, refer to CHART C-6.
If the above are OK, it is a faulty oxygen sensor.
Code DTC 14
CIRCUIT DESCRIPTION:
The coolant temperature sensor uses a thermistor to control the signal voltage to the Electronic Control Module (ECM). The ECM applies a voltage on CKT 410 to the sensor. When the engine is cold, the sensor (thermistor) resistance is high, therefore the ECM will see high signal voltage. As the engine warms, the sensor resistance becomes less, and the voltage drops. At normal engine operating temperature (85~C to 95~C) the voltage will measure about 1.5 to 2.0 volts.
NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
Code 14 will set if signal voltage indicates a coolant temperature above 130~C (266~C) for 3 seconds.
This test will determine if CKT 410 is shorted to ground which will cause the conditions for Code 14.
DIAGNOSTIC AIDS:
Check harness routing for a potential short to ground in CKT 410. "Scan" tool displays engine temperature in degrees centigrade. After engine is started, the temperature should rise steadily to about 90C then stabilize when thermostat opens. See TESTING PROCEDURES/DIAGNOSIS BY SYMPTOM/INTERMITTENTS.
CIRCUIT DESCRIPTION:
The Electronic Control Module (ECM) supplies a voltage of about 0.45 volt between terminals "D6" and "D7". (If measured with a 10 megohm digital voltmeter, this may read as low as 0.32 volt.) The 02 sensor varies the voltage within a range of about 1 volt if the exhaust is rich, down through about 0.10 volt if exhaust is lean. The sensor is like an open circuit and produces no voltage when it is below about 316~C (600~F) An open sensor circuit or cold sensor causes "Open Loop" operation.
NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
Code 44 is set when the 02 sensor signal voltage on CKT 412 remains below 0.2 volt for 2O seconds and the system is operating in "Closed Loop".
DIAGNOSTIC AIDS:
Using the "Scan", observe the block learn values at different rpm and air flow conditions. The "Scan" also displays the block cells, so the block learn values can be checked in each of the cells to determine when the Code 44 may have been set. If the conditions for Code 44 exists the block learn values will be around 150.
02 Sensor Wire. Sensor pigtail may be mis-positioned and contacting the exhaust manifold. Check for intermittent ground in wire between connector and sensor.
Mass Air Flow (MAF) Sensor. A Mass Air Flow (MAF) sensor output that causes the ECM to sense a lower than normal air flow will cause the system to go lean. Disconnect the MAF sensor and if the lean condition is gone, replace the MAF sensor.
Lean Injector(s). Perform injector balance test CHART C-2A.
Fuel Contamination. Water, even in small amounts, near the in-tank fuel pump inlet can be delivered to the injectors. The water causes a lean exhaust and can set a Code 44.
Fuel Pressure. System will be lean if pressure is too low. It may be necessary to monitor fuel pressure while driving the car at various road speeds and/or loads to confirm, See CHART A-7.
Exhaust Leaks. If there is an exhaust leak, the engine can cause outside air to be pulled into the exhaust and past the sensor. Vacuum or crankcase leaks can cause a lean condition.
AIR System. Be sure air is not being directed to the exhaust ports while "Closed Loop". If the block learn value goes down while squeezing air hose to left side exhaust ports, refer to CHART C-6.
If the above are OK, it is a faulty oxygen sensor.
Code DTC 14
CIRCUIT DESCRIPTION:
The coolant temperature sensor uses a thermistor to control the signal voltage to the Electronic Control Module (ECM). The ECM applies a voltage on CKT 410 to the sensor. When the engine is cold, the sensor (thermistor) resistance is high, therefore the ECM will see high signal voltage. As the engine warms, the sensor resistance becomes less, and the voltage drops. At normal engine operating temperature (85~C to 95~C) the voltage will measure about 1.5 to 2.0 volts.
NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to ECM CONNECTOR IDENTIFICATION under ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS for correct color code identification of circuit.
TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.
Code 14 will set if signal voltage indicates a coolant temperature above 130~C (266~C) for 3 seconds.
This test will determine if CKT 410 is shorted to ground which will cause the conditions for Code 14.
DIAGNOSTIC AIDS:
Check harness routing for a potential short to ground in CKT 410. "Scan" tool displays engine temperature in degrees centigrade. After engine is started, the temperature should rise steadily to about 90C then stabilize when thermostat opens. See TESTING PROCEDURES/DIAGNOSIS BY SYMPTOM/INTERMITTENTS.
Team Owner
Joined: Jan 2003
Posts: 20,254
Likes: 221
From: Summerland B.C. Canada
From my 86 FSM, but still should be useful. 
http://members.shaw.ca/corvette86/Code%2014.pdf
http://members.shaw.ca/corvette86/Code%2044.pdf
http://members.shaw.ca/corvette86/Code%2014.pdf
http://members.shaw.ca/corvette86/Code%2044.pdf
