# Need help setting TPS on 98 WR400F

3 replies to this topic
• # ekn8404

Posted October 22, 2013 - 06:26 PM

Anyone know how to set the TPS on a 98 WR400F? Manual says see example but im confused. Any help would be great.

• # Krannie McKranface

Posted October 22, 2013 - 07:27 PM

The manual blows when it comes to setting the TPS. Lots of confusing information.

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• # grayracer513

Posted October 25, 2013 - 03:27 PM

The manual tells you to first read the resistance across the black and blue leads with the connector disconnected.  It needs to fall between 4.0 and 6.0 Ω.  After you have found the actual resistance of your TPS, and it is in range, then you use that resistance to calculate the value it should be set to at closed throttle (idle).  The resistance value is to be between .13 and .15 of the resistance you measured from black to blue, so if you find that first reading to be 5.5Ω, then you multiply that number first by .13 (.13 X 5.5 =.715Ω) and again by .15 (.15 X 5.5 = .825Ω).  Now you have the range that you're looking to set your TPS to at idle; .715 - .825Ω.

With the connector still disconnected, now measure from the yellow to the black lead, and adjust the TPS position until it reads within the calculated range.

Simple.

• # DeepPurplishBlue

Posted October 26, 2013 - 01:24 AM

The manual tells you to first read the resistance across the black and blue leads with the connector disconnected.  It needs to fall between 4.0 and 6.0 Ω.  After you have found the actual resistance of your TPS, and it is in range, then you use that resistance to calculate the value it should be set to at closed throttle (idle).  The resistance value is to be between .13 and .15 of the resistance you measured from black to blue, so if you find that first reading to be 5.5Ω, then you multiply that number first by .13 (.13 X 5.5 =.715Ω) and again by .15 (.15 X 5.5 = .825Ω).  Now you have the range that you're looking to set your TPS to at idle; .715 - .825Ω.

With the connector still disconnected, now measure from the yellow to the black lead, and adjust the TPS position until it reads within the calculated range.

Simple.

Also, when measuring low resistances it is a good idea to short the probes of your meter and note the ohm reading.   Then, subtract that

from the reading you get during testing of the TPS.  Otherwise you could flag it as bad or out of spec when in fact it is still OK.