2002 TA oil gauge problem
2002 TA oil gauge problem Just received my car from a shop doing work on engine. The oil gauge is pegged to the max. An auxiliary gauge reads normal, so I'm not worried as to the true nature of the pressure.
The engine was removed and replaced for motor work. Nothing done to the interior or instrument panel. The ECU was removed so it could be flashed with a starting tune for the motor work.
The mechanic said he saw the oil gauge reading and tested the sender. He said it was normal. He said he thought the gauge was broken to begin with and that was the reason for the auxiliary gauge.
Where does the wiring go from the sender as I'd like to look for the short if it can be readily fixed. Does it go to the ECU or the instrument panel or .......? Any info would be greatly appreciated.
Steve
The engine was removed and replaced for motor work. Nothing done to the interior or instrument panel. The ECU was removed so it could be flashed with a starting tune for the motor work.
The mechanic said he saw the oil gauge reading and tested the sender. He said it was normal. He said he thought the gauge was broken to begin with and that was the reason for the auxiliary gauge.
Where does the wiring go from the sender as I'd like to look for the short if it can be readily fixed. Does it go to the ECU or the instrument panel or .......? Any info would be greatly appreciated.
Steve
Joined: Nov 2003
Posts: 11,330
Likes: 346
From: Jacksonville, FL (originally from Toronto Canada)
You will not find a short. The oil pressure gauge is grounded through the oil pressure sensor in the engine which is a variable resistor. The lower the resistance, the lower the reading on the gauge. So a short to ground would cause the gauge to read low (or zero) all the time... not high as you describe.
Here is your diagnostic procedure:
- Unplug the oil pressure sensor and connect a jumper wire between the connector and a good ground. Turn on the ignition. If the gauge now reads low pressure, check that the connector is making good contact with the sending unit (if not, fix it and test again). If the connector is making good contact then the sender is faulty and must be replaced.
- If the gauge does not read low when the wire is grounded, look for a broken wire or bad connection between the sensor and the instrument cluster (tan wire in position B14 of the IP connector) by doing a continuity test with a multimeter. Repair any problem found with the wire and retest.
- If the connector, the sending unit, and the wire all check out then the gauge itself is defective.
Here is your diagnostic procedure:
- Unplug the oil pressure sensor and connect a jumper wire between the connector and a good ground. Turn on the ignition. If the gauge now reads low pressure, check that the connector is making good contact with the sending unit (if not, fix it and test again). If the connector is making good contact then the sender is faulty and must be replaced.
- If the gauge does not read low when the wire is grounded, look for a broken wire or bad connection between the sensor and the instrument cluster (tan wire in position B14 of the IP connector) by doing a continuity test with a multimeter. Repair any problem found with the wire and retest.
- If the connector, the sending unit, and the wire all check out then the gauge itself is defective.
You will not find a short. The oil pressure gauge is grounded through the oil pressure sensor in the engine which is a variable resistor. The lower the resistance, the lower the reading on the gauge. So a short to ground would cause the gauge to read low (or zero) all the time... not high as you describe.
Here is your diagnostic procedure:
- Unplug the oil pressure sensor and connect a jumper wire between the connector and a good ground. Turn on the ignition. If the gauge now reads low pressure, check that the connector is making good contact with the sending unit (if not, fix it and test again). If the connector is making good contact then the sender is faulty and must be replaced.
- If the gauge does not read low when the wire is grounded, look for a broken wire or bad connection between the sensor and the instrument cluster (tan wire in position B14 of the IP connector) by doing a continuity test with a multimeter. Repair any problem found with the wire and retest.
- If the connector, the sending unit, and the wire all check out then the gauge itself is defective.
Here is your diagnostic procedure:
- Unplug the oil pressure sensor and connect a jumper wire between the connector and a good ground. Turn on the ignition. If the gauge now reads low pressure, check that the connector is making good contact with the sending unit (if not, fix it and test again). If the connector is making good contact then the sender is faulty and must be replaced.
- If the gauge does not read low when the wire is grounded, look for a broken wire or bad connection between the sensor and the instrument cluster (tan wire in position B14 of the IP connector) by doing a continuity test with a multimeter. Repair any problem found with the wire and retest.
- If the connector, the sending unit, and the wire all check out then the gauge itself is defective.
I suppose I can go through your test procedure this coming w'end.
Thanks again. Very informative.
Steve
Last edited by steve-d; Aug 13, 2014 at 08:03 AM.
Steve-d did you figure out your issue? I have the same problem. Replaced the sensor twice, replaced the plug and traced the wires. Problem seems to be the gauge itself. Any idea how or where to get it fixed?
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo