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Diagnostic Trouble Codes & Sensor testing
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SportsterDoc Offline
1st Service Completed

southern Nevada
Posts: 126
Joined: Nov 2017
Post: #1
Diagnostic Trouble Codes & Sensor testing
Code Retrieval

With ignition on or idling, sidestand down, the Malfunction Indicator light (MIL) / Check Engine Light (CEL) will blink a Diagnostic Trouble Code (DTC), if the code is active.
Long blink = 1.3 seconds is a 10 value
Short blink – 0.5 second is a 1 value
Example: 2 longs + 5 short = DTC 25 (does not distinguish between 25-1 or 25-2)

For a stored code, with engine off, under the left side cover, short brown and green wires in Data Link Connector (DLC). With ignition switch on and run/stop switch in run, read code after MIL illuminates once and goes off. If MIL stays on, there is no stored DTC.

The following test condensations are a collaboration by PopGun and SportsterDoc; exclude the use of Honda diagnostics tools, requiring only a multimeter (volts and ohms).

This is a work in progress. At this point, by not utilizing the Honda MCS (Motorcycle Communications System), resistance is available only for EOT and TP sensors. With additional research/input from fellow forum members, we intend to add data to this thread.

Meanwhile, if a code is active and the following tests provide in-spec values, it is likely that the sensor has failed/is failing.

DTC 1-1 MAP (Manifold Absolute Pressure) sensor low voltage or DTC 1-2 MAP (Manifold Absolute Pressure) sensor high voltage
With MAP connector disconnected, ignition switch on, stop/run on, probe connector outside pins black/yellow (+) to black/green (-) for 4.75 to 5.25 vdc.

If no voltage, with ignition off, check continuity on black/yellow to ECM connector.

With ignition off, check MAP output center pin light green/yellow wire for no continuity (infinity) to ground. For DTC 1-2, check for continuity to ECM connector.

DTC 2-1 MAP sensor hose connection
Check electrical connectors and manifold vacuum hose is intact/connected

DTC 7-1 EOT (Engine Oil Temperature) sensor low voltage
Measure resistance of sensor between terminals of 2.4 – 2.9 K ohms at 20 degrees C/68 degrees F.

With ignition switch off, sensor disconnected, check connector pin to red/blue wire for no continuity (infinity) to ground.

DTC 7-1 EOT sensor high voltage
With ignition switch off, sensor disconnected, check for continuity of red/blue and green/orange wires to ECM connector.

DTC 8-1 TP (Throttle Position) sensor low voltage
With ignition switch on and stop/run on, probe sensor contacts to verify steady voltage increase from throttle fully closed to throttle fully open.
With ignition switch off, disconnect the connector, then with ignition switch on and stop/run on, measure voltage between connector pins black/yellow (+) to black/green (-) for 4.75 to 5.25 vdc.

If no voltage, with ignition off, check continuity on black/yellow to ECM connector, for continuity of center pin sensor output black/red wire to ECM connector and for no continuity (infinity) of black/red wire to ground.

DTC 8-2 TP (Throttle Position) sensor high voltage
With ignition switch off, disconnect the connector, measure sensor resistance between black/red and black green of 0.5 to 1.5 K ohms. Then with ignition switch on and stop/run on, measure voltage between connector pins black/yellow (+) to black/green (-) for 4.75 to 5.25 vdc.

DTC 9-1 IAT (Incoming Air Temperature) sensor low voltage
With ignition switch off, disconnect the connector, check pin to green/blue wire for no continuity (infinity) to ground.

DTC 9-2 IAT (Incoming Air Temperature) sensor high voltage
With ignition switch off, disconnect the connector, check continuity of gray/blue and green/orange to ECM.

If you notice an error, corrections are welcome.

Recent bikes:
2018 Yamaha XT250
2016 Moto Guzzi V7II
2017 Yamaha TW200
2012 Triumph Bonneville
2002 Harley-Davidson Sportster 1200 Sport
2003 Harley-Davidson Sportster XLH883
12-07-2017 04:17 PM
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Houtman Offline
High Mileage

NC USA
Posts: 826
Joined: May 2013
Post: #2
RE: Diagnostic Trouble Codes & Sensor testing
I fully agree with all of this .........
(have no clue !)
12-07-2017 05:36 PM
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Cormanus Offline
Moderator

Queensland, Australia
Posts: 10,475
Joined: Dec 2013
Post: #3
Diagnostic Trouble Codes & Sensor testing
Thank you SportsterDoc and popgun. When the time comes for me to figure this, I’ll know who to ask.
12-07-2017 06:28 PM
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popgun Offline
Lives On Two Wheels

Virginia Beach
Posts: 5,855
Joined: Apr 2013
Post: #4
RE: Diagnostic Trouble Codes & Sensor testing
Its mostly condensed out of the manual and Doc is doing the work you see here. He being a bike tech and me an electronics tech makes collaboration easy. And it helps that we finally are getting some actual data from a couple of users.

It would be nice if we had detailed technical data on system operation from Honda, but that ain’t happening Smile

He, and I, have some other ideas for testing, but I don’t have much time to look into it until after the new year.

If you come to a fork in the road, take it!
2013 CB1100
2012 ST1300
12-07-2017 06:38 PM
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Dave Offline
Running Like a Top

San Diego, ca
Posts: 335
Joined: Jan 2014
Post: #5
RE: Diagnostic Trouble Codes & Sensor testing
Sportsterdoc & Popgun, thank you guys very much. I've saved a copy of these instructions for future use.
12-07-2017 08:02 PM
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SportsterDoc Offline
1st Service Completed

southern Nevada
Posts: 126
Joined: Nov 2017
Post: #6
RE: Diagnostic Trouble Codes & Sensor testing
(12-07-2017 06:38 PM)popgun Wrote:  Its mostly condensed out of the manual and Doc is doing the work you see here. He being a bike tech and me an electronics tech makes collaboration easy. And it helps that we finally are getting some actual data from a couple of users.

Referring to me as a bike tech may be a stretch. But I enjoy helping as much as I can.

My dad (now retired at age 91) is an industrial/commercial electrician with expertise in motor controls and taught me a lot from age ~10 up. He also owned a rewind shop, which sold industrial electric motor and power transmission equipment.

So I have a decent electrical background, but did not get much involved in electronics until Sportsters went EFI in 2007 and I was already assisting with electrical (and carb) issues on XLForum.net (Sportster.org 2003-2012)

So, please do not hold me to too high a standard!

Paid vacation by Uncle Sam, 1965-1969

Power station operator, Los Angeles Department of Water and Power, 1970 to 1979

Electrician, supplemental income, construction and industrial, 1971 to 1984.

Motorcycle (and automobile) mechanic, supplemental income, 1971 to 1984. (dba Cycle Tuning Unlimited)

Operated industrial electric motor rewind shop, 1979-1983. Served on Board of Directors, Electrical Apparatus Service Association SoCal chapter, 1981 to 1982.

Electrician 1983

Managed tire shop, 1984

Sales rep, power transmission equipment, 1984-1985

Sales manager for industrial automation company, 1985-1986. Business was heavy in electrical connector assembly

Regional sales manager for Hirose Electric USA (#2 Japanese connector manufacturer) 1987

Contract manager for Canadian headquartered industrial automation company, 1987-1992

Director of sales for industrial automation company, 1993

Sales manager for industrial automation company, 1997-2017, (retired at age 70)

Recent bikes:
2018 Yamaha XT250
2016 Moto Guzzi V7II
2017 Yamaha TW200
2012 Triumph Bonneville
2002 Harley-Davidson Sportster 1200 Sport
2003 Harley-Davidson Sportster XLH883
12-08-2017 12:46 PM
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pdedse Online
Running Like a Top

Oregon
Posts: 456
Joined: Dec 2013
Post: #7
RE: Diagnostic Trouble Codes & Sensor testing
(12-08-2017 12:46 PM)SportsterDoc Wrote:  ...

So I have a decent electrical background,...

Power station operator...Electrician...Motorcycle (and automobile) mechanic, ...
Operated industrial electric motor rewind shop, ...Electrician...Managed tire shop,
Sales manager for industrial automation company, 1985-1986. Business was heavy in electrical connector assembly....Director of sales for industrial automation company,...Sales manager for industrial automation company, 1997-2017, (retired at age 70)

You're HIRED! Now come fix my dang bike.BikerSmile
12-08-2017 03:45 PM
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Cormanus Offline
Moderator

Queensland, Australia
Posts: 10,475
Joined: Dec 2013
Post: #8
RE: Diagnostic Trouble Codes & Sensor testing
Crikey!? Do we all have to publish or CVs? Big Grin
12-08-2017 03:57 PM
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popgun Offline
Lives On Two Wheels

Virginia Beach
Posts: 5,855
Joined: Apr 2013
Post: #9
RE: Diagnostic Trouble Codes & Sensor testing
I was wondering that too... Undecided

If you come to a fork in the road, take it!
2013 CB1100
2012 ST1300
12-08-2017 04:07 PM
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SportsterDoc Offline
1st Service Completed

southern Nevada
Posts: 126
Joined: Nov 2017
Post: #10
RE: Diagnostic Trouble Codes & Sensor testing
(12-08-2017 03:57 PM)Cormanus Wrote:  Crikey!? Do we all have to publish or CVs? Big Grin

You are welcome to delete from "Paid vacation by Uncle Sam" on.
On any other forum, I would have second thoughts and done so myself, but this forum only gives an hour for second thoughts.

(12-08-2017 03:45 PM)pdedse Wrote:  You're HIRED! Now come fix my bike.

No longer for hire, but be happy to help evaluate diagnostics.
Checked for any vacuum loss?

Recent bikes:
2018 Yamaha XT250
2016 Moto Guzzi V7II
2017 Yamaha TW200
2012 Triumph Bonneville
2002 Harley-Davidson Sportster 1200 Sport
2003 Harley-Davidson Sportster XLH883
(This post was last modified: 12-08-2017 04:33 PM by SportsterDoc.)
12-08-2017 04:25 PM
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