Pictures of various sensors (NA) for reference
07-14-07, 01:17 PM
#1
Pictures of various sensors (NA) for reference
I took a bunch of pictures of various sensors and engine components under the hood and inside for reference. My engine bay needs some cleaning, so pardon the appearance. These are not comprehensive - maybe others can add the ones not clearly shown (I'm thinking the oil temp sensor for the sub-zero assist and the back of the throttle body for example). Maybe I or someone will add arrows to label the parts. Cheers to all!
More pictures to follow...
More pictures to follow...
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07-14-07, 07:04 PM
#10
Trouble code check connector: Post 7, pic #4, 6-pin green connector with only 4 pins used.
Hatch striker mechanism with built-in switch (for light and theft deterrent system): Sorry, pic doesn't really show much.
Oil level sensor: Post 6, pic #4: Seen just above oil drain plug towards front of car. Used for low oil level light and buzzer. Three bolts hold it on. Always replace gasket for less trouble.
Hatch striker mechanism with built-in switch (for light and theft deterrent system): Sorry, pic doesn't really show much.
Oil level sensor: Post 6, pic #4: Seen just above oil drain plug towards front of car. Used for low oil level light and buzzer. Three bolts hold it on. Always replace gasket for less trouble.
07-14-07, 08:29 PM
#11
Power Steering Control Unit: Post 6, pic # 2, mounted under steering column.
Circuit Opening Relay (for EGI, fuel pump, etc.): Post 6, pic #1, mounted under instrument panel.
CPU (various functions incl turn signal, chimes, hazard, etc.) and Fuse panel: Post 5, pic #5, near dead pedal. No cruise control in this car, btw., which would be beside the CPU.
Circuit Opening Relay (for EGI, fuel pump, etc.): Post 6, pic #1, mounted under instrument panel.
CPU (various functions incl turn signal, chimes, hazard, etc.) and Fuse panel: Post 5, pic #5, near dead pedal. No cruise control in this car, btw., which would be beside the CPU.
07-14-07, 08:53 PM
#12
Idle adjust screw: Post 5, pic #1
Fuel pump check connector: Post 3, pic #5. When ignition is on, jumpering one pin to the other on this plug with a wire causes the fuel pump to turn on. This is used for testing or just pressurizing the fuel rail.
TPS check connector: Post 3, pic #4, 5, green three pin plug used to check throttle position sensor adjustment
AFM (airflow meter): Post 3, pic #4, mounted on the right of the large rubber intake hose/snorkel. Has long, narrow connector shown. This car has an aftermarked cone-type air filter. In stock configuration, the AFM is hidden by the Air filter box above it.
Coolant temp. sensor (for EGI system): Post 3, pic #3, mounted to rear of water pump outlet going into thermostat housing. This is *not* the sensor for the instrument gauge, nor does it control the fan.
Coolant temp switch for fan (not pictured): Post 3, pic #3. The car pictured does not have an electric fan. If it did, the temp. switch would be mounted on top of the thermostat housing shown where the round cavity (plugged up) is. It would have one wire going to it. The harness has a plug for this sensor, even if the car doesn't have the sensor. You'll find it laying near.
Fuel pump check connector: Post 3, pic #5. When ignition is on, jumpering one pin to the other on this plug with a wire causes the fuel pump to turn on. This is used for testing or just pressurizing the fuel rail.
TPS check connector: Post 3, pic #4, 5, green three pin plug used to check throttle position sensor adjustment
AFM (airflow meter): Post 3, pic #4, mounted on the right of the large rubber intake hose/snorkel. Has long, narrow connector shown. This car has an aftermarked cone-type air filter. In stock configuration, the AFM is hidden by the Air filter box above it.
Coolant temp. sensor (for EGI system): Post 3, pic #3, mounted to rear of water pump outlet going into thermostat housing. This is *not* the sensor for the instrument gauge, nor does it control the fan.
Coolant temp switch for fan (not pictured): Post 3, pic #3. The car pictured does not have an electric fan. If it did, the temp. switch would be mounted on top of the thermostat housing shown where the round cavity (plugged up) is. It would have one wire going to it. The harness has a plug for this sensor, even if the car doesn't have the sensor. You'll find it laying near.
07-14-07, 09:16 PM
#13
Coolant low level switch: Post 3, pic #1, mounted on the top of the radiator - this car doesn't have the additional radiator cap along with the thermostat housing cap.
EGI solenoid (fuel injector) resistor: Post 2, pic #5, shiny rectangular part to the left of the aftermarket air filter, mounted to right shock tower with oval 5-pin plug. Used only on earlier S4's with the low impedance (resistance) fuel injectors, roughly 86-87.5 models.
Boost (and vacuum) sensor: Post 2, pic #4, rectangular, black, four-pin plug, and vacuum hose between it and Upper intake manifold.
Variable resistor: Post 2, pic #4 near middle; has sloted screw head (which is usually plugged up with epoxy from factory) for adjustment of idle mixture.
ACV (air control valve): Post 2, pic #3; mounted to lower intake manifold. Note I removed the silencer hose coming out the side, so you just see a roughly 3/4" nipple sticking out of the valve.
Radiator switch: Post 2, pic #1; looking at the lower driver's side corner of the radiator. At around 16-19 degrees Celsius (let's say 70 F) it closes. Used for the Secondary Air injection system, and it may also influence cold start behaviour of the EGI. Not used for the sub-zero start system.
Oil thermo sensor (not shown): Mounted to oil pan, ahead of oil level sensor. Not on california cars, and maybe others. Used only for sub-zero start assist system.
EGI solenoid (fuel injector) resistor: Post 2, pic #5, shiny rectangular part to the left of the aftermarket air filter, mounted to right shock tower with oval 5-pin plug. Used only on earlier S4's with the low impedance (resistance) fuel injectors, roughly 86-87.5 models.
Boost (and vacuum) sensor: Post 2, pic #4, rectangular, black, four-pin plug, and vacuum hose between it and Upper intake manifold.
Variable resistor: Post 2, pic #4 near middle; has sloted screw head (which is usually plugged up with epoxy from factory) for adjustment of idle mixture.
ACV (air control valve): Post 2, pic #3; mounted to lower intake manifold. Note I removed the silencer hose coming out the side, so you just see a roughly 3/4" nipple sticking out of the valve.
Radiator switch: Post 2, pic #1; looking at the lower driver's side corner of the radiator. At around 16-19 degrees Celsius (let's say 70 F) it closes. Used for the Secondary Air injection system, and it may also influence cold start behaviour of the EGI. Not used for the sub-zero start system.
Oil thermo sensor (not shown): Mounted to oil pan, ahead of oil level sensor. Not on california cars, and maybe others. Used only for sub-zero start assist system.
07-14-07, 09:27 PM
#14
Solenoid valves: Post 1, pic #5: Pic shows colour arrangement of solenoid plugs for (ACV) Relief, EGR valve, Switching (ACV) and Fuel pressure regulator (left to right).
Purge control valve, Air Bypass Valve, Intake air sensor: Post 1, pic #4; purge is black plastic and cylindrical on picture with small vacuum hose on top and large hose to oil filler neck below and small vacuum hose below. Air bypass valve is metal and is mounted to bracket with two bolts and has two pin plug that goes to it. Intake air sensor is just to the left of the two bolts that hold the bracket just mentioned, two pins, tiny sensor. There is another intake air sensor inside the air flow meter (AFM).
Purge control valve, Air Bypass Valve, Intake air sensor: Post 1, pic #4; purge is black plastic and cylindrical on picture with small vacuum hose on top and large hose to oil filler neck below and small vacuum hose below. Air bypass valve is metal and is mounted to bracket with two bolts and has two pin plug that goes to it. Intake air sensor is just to the left of the two bolts that hold the bracket just mentioned, two pins, tiny sensor. There is another intake air sensor inside the air flow meter (AFM).
07-14-07, 09:38 PM
#15
Initial set coupler: Post 1, pic #2; the famous initial set coupler that the FSM says to jumper during some adjustments and reminds to un-jumper once finished. Green two-pin plug.
Oil pressure gauge sender: Post 1, pic #1; mushroom shaped cylindrical sensor that has funny connector that attaches from the side (I'm holding its wire). The other wire goes to the coolant temp gauge sender.
Coolant temp. gauge sender: Post 1, pic #1: tiny round sender screwed into the block with one wire pin. This sends coolant temp. info to the gauge. Mounted above oil pressure sender.
Credits: The info in this thread is taken from the FSM, personal experience and last but not least from experience gained from very knowledgeable members in this forum. I hope it will be useful to less experienced members and guests. I hope to add a few more pictures in time and feel free to add to it.
Oil pressure gauge sender: Post 1, pic #1; mushroom shaped cylindrical sensor that has funny connector that attaches from the side (I'm holding its wire). The other wire goes to the coolant temp gauge sender.
Coolant temp. gauge sender: Post 1, pic #1: tiny round sender screwed into the block with one wire pin. This sends coolant temp. info to the gauge. Mounted above oil pressure sender.
Credits: The info in this thread is taken from the FSM, personal experience and last but not least from experience gained from very knowledgeable members in this forum. I hope it will be useful to less experienced members and guests. I hope to add a few more pictures in time and feel free to add to it.
07-15-07, 09:55 AM
#16
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This post could use a little better organization. After organizing it to make it easier to use it would make a good candidate for the archives. The sensor name and the description should either immediately follow or precede the images and everything should be placed in alphabetical order.
I like to see someone making a good contribution to the forum. Thanks.
I like to see someone making a good contribution to the forum. Thanks.
07-15-07, 08:24 PM
#17
No problem...and like positive suggestions. I plan on taking better pictures with a cleaner engine bay and placing names right on the pictures. Did this from home, dial-up 
I hope this helps someone out, i.e. if they search by sensor name and find this thread.
I hope this helps someone out, i.e. if they search by sensor name and find this thread.
07-16-07, 03:56 PM
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yea, if all these were labled that would be great.
what do when you clean the engine bay? do you just clean around everything or take engine and all out and clean the bay?
what do when you clean the engine bay? do you just clean around everything or take engine and all out and clean the bay?
07-16-07, 04:23 PM
#24
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