Engine Codes
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Engine Codes
I recently plugged the Snap-On computer onto the FD to check the system (won't start, has good compression, good spark, fuel).
Here is the list of problems the computer displayed.
Engine codes:
09 Atmospheric pressure sensor circuit
11 Intake air temp sensor problem
12 Throttle sensor or circuit problem
13 Vaccum sensor or circuit problem
20 Metering oil pump position senor
23 Fuel thermosensor open or short circuit
.... I don't even know where to start, for #20 I think I need a new oil sender. But I don't know what the others are about...
Any ideas?
BTW this is my first time owning an FD...
Here is the list of problems the computer displayed.
Engine codes:
09 Atmospheric pressure sensor circuit
11 Intake air temp sensor problem
12 Throttle sensor or circuit problem
13 Vaccum sensor or circuit problem
20 Metering oil pump position senor
23 Fuel thermosensor open or short circuit
.... I don't even know where to start, for #20 I think I need a new oil sender. But I don't know what the others are about...
Any ideas?
BTW this is my first time owning an FD...
I've dealt with two of those issues.
Intake Air Thermosensor is easy enough, but you'll have to pull the upper intake manifold to access the sensor. The Metering Oil Pump sensor is part of the metering oil pump assembly and, as far as I could tell it's more practical to change out the whole thing.
----> https://www.rx7club.com/3rd-generation-specific-1993-2002-16/changing-oil-metering-pump-omp-while-car-my-how-675341/
Intake Air Thermosensor is easy enough, but you'll have to pull the upper intake manifold to access the sensor. The Metering Oil Pump sensor is part of the metering oil pump assembly and, as far as I could tell it's more practical to change out the whole thing.
----> https://www.rx7club.com/3rd-generation-specific-1993-2002-16/changing-oil-metering-pump-omp-while-car-my-how-675341/
Recovering Miataholic
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From: Fountain Valley, CA
Have you first disconnected the battery to reset the codes, and then restarted the engine and verified that they do come back? The PCME will remember the codes forever once stored, even if the problem has gone away, unless it is de-powered.
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Yup, disconnected the positive terminal on the battery and press the brake a couple of times before I test it.
Thread Starter
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Joined: Dec 2006
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From: USA
I've dealt with two of those issues.
Intake Air Thermosensor is easy enough, but you'll have to pull the upper intake manifold to access the sensor. The Metering Oil Pump sensor is part of the metering oil pump assembly and, as far as I could tell it's more practical to change out the whole thing.
----> https://www.rx7club.com/showthread.php?t=675341
Intake Air Thermosensor is easy enough, but you'll have to pull the upper intake manifold to access the sensor. The Metering Oil Pump sensor is part of the metering oil pump assembly and, as far as I could tell it's more practical to change out the whole thing.
----> https://www.rx7club.com/showthread.php?t=675341
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From: USA
Anybody have any clue on where I should start looking for these engine codes:
09 Atmospheric pressure sensor circuit
12 Throttle sensor or circuit problem
13 Vaccum sensor or circuit problem
23 Fuel thermosensor open or short circuit
Anyone?
09 Atmospheric pressure sensor circuit
12 Throttle sensor or circuit problem
13 Vaccum sensor or circuit problem
23 Fuel thermosensor open or short circuit
Anyone?
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Code:
1 Ignition coil (trailing side) 2 Crank position NE sensor 3 Crank position G sensor 5 Knock sensor 8 Airflow meter (AFM) 9 Water thermosensor 10 Intake air thermosensor (AFM) 11 Intake air thermosensor (engine) 12 Throttle sensor - full range 13 Pressure sensor - intake manifold 14 Atmospheric pressure sensor (built in ECU) 15 oxygen sensor 17 Feedback system for O2 sensor 18 Throttle sensor - narrow range 20 Metering oil pump position sensor 23 Fuel thermosensor 25 Solenoid valve - pressure regulator control 26 metering oil pump stepper motor 27 Metering oil pump 28 Solenoid valve - EGR 29 Solenoid valve - EGR vent 30 Solenoid valve - split air bypass 31 solenoid valve - relief 1 32 Solenoid valve - switching 33 Solenoid valve - port air bypass 34 Solenoid valve -idle speed control (BAC) 37 Metering oil pump 38 Solenoid valve - accelerated warmup system and air supply valve 39 Solenoid valve - relief 2 40 Solenoid valve - purge control (auxilary port valve) 41 Solenoid valve - variable dynamic effect intake (VDI) 42 Solenoid valve - turbo precontrol 43 Solenoid valve - wastegate control 44 Solenoid valve - turbo control 45 Solenoid valve - charge control 46 Solenoid valve - charge relief control 50 Solenoid valve - double throttle control 51 Fuel pump relay 54 Air pump relay 65 Air conditioning signal 71 Injector - front secondary 73 Injector - rear secondary 76 Slip lockup signal 77 Torque reduced signal
12 - Throttle sensor is going to be the TPS on the throttle body
13 - Pressure sensor is going to be the MAP/BOOST sensor located on the firewall on the drivers side.
23 - Fuel thermosensor is the sensor on the secondary fuel rail
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Thanks Mahjik for the info.
Should I just replace these items? I'm going to try and pull the wiring harness, and test everything this weekend.
But "14 Atmospheric pressure sensor (built in ECU)" how the heck I test that? Should I just bring my ECU to Autozone and have it checked out?
Sorry I'm such a noob to the FD, but this is my first car.
9 - Water thermosensor is the upper sensor on the back of the water pump housing.
12 - Throttle sensor is going to be the TPS on the throttle body
13 - Pressure sensor is going to be the MAP/BOOST sensor located on the firewall on the drivers side.
23 - Fuel thermosensor is the sensor on the secondary fuel rail
Should I just replace these items? I'm going to try and pull the wiring harness, and test everything this weekend.
But "14 Atmospheric pressure sensor (built in ECU)" how the heck I test that? Should I just bring my ECU to Autozone and have it checked out?
Sorry I'm such a noob to the FD, but this is my first car.
Code:
1 Ignition coil (trailing side) 2 Crank position NE sensor 3 Crank position G sensor 5 Knock sensor 8 Airflow meter (AFM) 9 Water thermosensor 10 Intake air thermosensor (AFM) 11 Intake air thermosensor (engine) 12 Throttle sensor - full range 13 Pressure sensor - intake manifold 14 Atmospheric pressure sensor (built in ECU) 15 oxygen sensor 17 Feedback system for O2 sensor 18 Throttle sensor - narrow range 20 Metering oil pump position sensor 23 Fuel thermosensor 25 Solenoid valve - pressure regulator control 26 metering oil pump stepper motor 27 Metering oil pump 28 Solenoid valve - EGR 29 Solenoid valve - EGR vent 30 Solenoid valve - split air bypass 31 solenoid valve - relief 1 32 Solenoid valve - switching 33 Solenoid valve - port air bypass 34 Solenoid valve -idle speed control (BAC) 37 Metering oil pump 38 Solenoid valve - accelerated warmup system and air supply valve 39 Solenoid valve - relief 2 40 Solenoid valve - purge control (auxilary port valve) 41 Solenoid valve - variable dynamic effect intake (VDI) 42 Solenoid valve - turbo precontrol 43 Solenoid valve - wastegate control 44 Solenoid valve - turbo control 45 Solenoid valve - charge control 46 Solenoid valve - charge relief control 50 Solenoid valve - double throttle control 51 Fuel pump relay 54 Air pump relay 65 Air conditioning signal 71 Injector - front secondary 73 Injector - rear secondary 76 Slip lockup signal 77 Torque reduced signal
12 - Throttle sensor is going to be the TPS on the throttle body
13 - Pressure sensor is going to be the MAP/BOOST sensor located on the firewall on the drivers side.
23 - Fuel thermosensor is the sensor on the secondary fuel rail
with my experiences with OBD-I cars, is that engine codes are usually popped up when there's a short or open in the sensor's circuits. i could be wrong, but that's only me speaking through experience 
Thanks Mahjik for the info.
Should I just replace these items? I'm going to try and pull the wiring harness, and test everything this weekend.
But "14 Atmospheric pressure sensor (built in ECU)" how the heck I test that? Should I just bring my ECU to Autozone and have it checked out?
Sorry I'm such a noob to the FD, but this is my first car.
Should I just replace these items? I'm going to try and pull the wiring harness, and test everything this weekend.
But "14 Atmospheric pressure sensor (built in ECU)" how the heck I test that? Should I just bring my ECU to Autozone and have it checked out?
Sorry I'm such a noob to the FD, but this is my first car.
What you should do is:
Check the plug to the Water Thermosensor. If its not connected onto the sensor all the way, then you found your problem. If it is, you need to test the connector to see if voltage is getting to the sensor (use a multimeter). If that passes, then you need to test the sensor (procedures are in the FSM). If that passes, then you most likely have a damaged wiring harness.
Just start with the one sensor first because if its a wiring harness problem, there is no sense in testing the others.
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You aren't getting code 14. Most likely the Snap-On reader doesn't have the proper labels for the codes. You were getting code 9 which is Water Thermosensor. You are also getting Fuel Thermosensor. Those two sensors are identical sensors, just used in two different locations for two different liquids.
What you should do is:
Check the plug to the Water Thermosensor. If its not connected onto the sensor all the way, then you found your problem. If it is, you need to test the connector to see if voltage is getting to the sensor (use a multimeter). If that passes, then you need to test the sensor (procedures are in the FSM). If that passes, then you most likely have a damaged wiring harness.
Just start with the one sensor first because if its a wiring harness problem, there is no sense in testing the others.
What you should do is:
Check the plug to the Water Thermosensor. If its not connected onto the sensor all the way, then you found your problem. If it is, you need to test the connector to see if voltage is getting to the sensor (use a multimeter). If that passes, then you need to test the sensor (procedures are in the FSM). If that passes, then you most likely have a damaged wiring harness.
Just start with the one sensor first because if its a wiring harness problem, there is no sense in testing the others.
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