Code 17 - Throttle Position Sensor - Defender Source
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  #1  
Old August 25th, 2015, 11:14 AM
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Russell
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Code 17 - Throttle Position Sensor

My 94' NAS is throwing code 17 intermittently but I haven't attempted to troubleshoot yet. Assuming the throttle position sensor is bad, where is the best place to source one? Stay with Lucas or is generic okay?
$180 shipped here from "lrparts": Land Rover Discovery 1 Range Classic Defender Throttle Position Sensor ETC8495 | eBay
Is "lrparts" Lucky8?
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  #2  
Old August 25th, 2015, 02:07 PM
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Jason England
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Don't assume it's bad. Test it first. It could just be corrosion on the connectors.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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Old August 25th, 2015, 02:46 PM
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Russell
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Originally Posted by leastonce View Post
Don't assume it's bad. Test it first. It could just be corrosion on the connectors.
Not to worry, I will sort out the issue before dropping ~ $200 on a nonreturnable part. Sort of fast tracking sourcing the part to move on it should it come to this route.
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Old August 25th, 2015, 03:53 PM
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They usually get flat spots. So you have to test throughout the whole range. Common failure item around 100k plus.
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Old August 31st, 2015, 09:02 AM
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I'm also having a recurring TPS fault. I can check for clean connectors but couldn't find a test procedure for the TPS in the manual. Can you tell me how to test it? Is it simply a continuity test across the full range of motion or what?
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Old August 31st, 2015, 09:10 AM
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Russell
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Quote:
Originally Posted by slorocco View Post
I'm also having a recurring TPS fault. I can check for clean connectors but couldn't find a test procedure for the TPS in the manual. Can you tell me how to test it? Is it simply a continuity test across the full range of motion or what?
The attached is 93' RRC Multiport Fuel Injection Electrical Troubleshooting Manual. This should be of help. Look at Test G. I haven't looked at my Defender work shop manual yet. Will scan the applicable pages and post here in the next few days. Thinking the TPS test will be the same.
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File Type: pdf 93 Range Rover Electrical Troubleshooting Manual.pdf (1.18 MB, 46 views)
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Old August 31st, 2015, 09:10 AM
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Kevin Keith
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For a RRC but should be the same...
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File Type: pdf TPS.pdf (102.6 KB, 40 views)
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Old August 31st, 2015, 09:27 AM
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Quote:
Originally Posted by slorocco View Post
I'm also having a recurring TPS fault. I can check for clean connectors but couldn't find a test procedure for the TPS in the manual. Can you tell me how to test it? Is it simply a continuity test across the full range of motion or what?
Connect you multi meter ( set to 20v DC ) between the ground ( battery -ve ) and pin 20 on the back of the ecu ( you'll need to remove the cover ).

you should see it start around 0.3 v and max around 5v. The progression should be smooth over the full travel of the throttle pedal. If you see any spikes or out of sequence values it would indicate a 'worn out spot' and cause for replacement.

An old fashioned analog meter is best for this test or something like a fluke that has a digital bar graph 'needle'
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #9  
Old August 31st, 2015, 09:43 AM
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Dan Prasada-Rao
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Perfect! Thanks guys.
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