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Diagnostic Trouble Codes & Sensor testing
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SportsterDoc Offline
High Mileage

New Mexico
Posts: 1,447
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.

23 Guzzi V7 SE 23 Yam XT250
18 Yam Bolt 22 Triumph St Twin 20 CanAm Ryker
14 Honda CB1100 18 Yam XT250 16 Guzzi V7II
17 Yam TW200 12 Triumph Bonnie 02 Sportster 1200S
03 Sportster 883 76 Honda CB750F 75 Honda CB360
70 Yam CT1 72 Yam CT2 72 Yam AT2
70 Honda SL350 70 Honda CL350 67 Honda CL160
67 Honda CB16062 Honda CA110
12-07-2017 04:17 PM
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Houtman Offline
Been There

NC USA
Posts: 4,481
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: 20,659
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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Lord Popgun Offline
I find your lack of RLETs disturbing

Virginia Beach
Posts: 10,442
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
Holder of the CB1100Forum Secret Decoder Ring
12-07-2017 06:38 PM
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Dave Offline
High Mileage

San Diego, ca
Posts: 934
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
High Mileage

New Mexico
Posts: 1,447
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.

23 Guzzi V7 SE 23 Yam XT250
18 Yam Bolt 22 Triumph St Twin 20 CanAm Ryker
14 Honda CB1100 18 Yam XT250 16 Guzzi V7II
17 Yam TW200 12 Triumph Bonnie 02 Sportster 1200S
03 Sportster 883 76 Honda CB750F 75 Honda CB360
70 Yam CT1 72 Yam CT2 72 Yam AT2
70 Honda SL350 70 Honda CL350 67 Honda CL160
67 Honda CB16062 Honda CA110
(This post was last modified: 02-20-2018 06:07 PM by The ferret.)
12-08-2017 12:46 PM
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pdedse Offline
Been There

Oregon
Posts: 3,243
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.The ferretSmile
12-08-2017 03:45 PM
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Cormanus Offline
Moderator

Queensland, Australia
Posts: 20,659
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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Lord Popgun Offline
I find your lack of RLETs disturbing

Virginia Beach
Posts: 10,442
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
Holder of the CB1100Forum Secret Decoder Ring
12-08-2017 04:07 PM
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SportsterDoc Offline
High Mileage

New Mexico
Posts: 1,447
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?

23 Guzzi V7 SE 23 Yam XT250
18 Yam Bolt 22 Triumph St Twin 20 CanAm Ryker
14 Honda CB1100 18 Yam XT250 16 Guzzi V7II
17 Yam TW200 12 Triumph Bonnie 02 Sportster 1200S
03 Sportster 883 76 Honda CB750F 75 Honda CB360
70 Yam CT1 72 Yam CT2 72 Yam AT2
70 Honda SL350 70 Honda CL350 67 Honda CL160
67 Honda CB16062 Honda CA110
(This post was last modified: 12-08-2017 04:33 PM by SportsterDoc.)
12-08-2017 04:25 PM
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