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+--- Thread: Diagnostic Trouble Codes & Sensor testing (/showthread.php?tid=11893)
Diagnostic Trouble Codes & Sensor testing - SportsterDoc - 12-07-2017 04:17 PM
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.
RE: Diagnostic Trouble Codes & Sensor testing - Houtman - 12-07-2017 05:36 PM
I fully agree with all of this .........
(have no clue !)
Diagnostic Trouble Codes & Sensor testing - Cormanus - 12-07-2017 06:28 PM
Thank you SportsterDoc and popgun. When the time comes for me to figure this, I’ll know who to ask.
RE: Diagnostic Trouble Codes & Sensor testing - Lord Popgun - 12-07-2017 06:38 PM
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
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.
RE: Diagnostic Trouble Codes & Sensor testing - Dave - 12-07-2017 08:02 PM
Sportsterdoc & Popgun, thank you guys very much. I've saved a copy of these instructions for future use.
RE: Diagnostic Trouble Codes & Sensor testing - SportsterDoc - 12-08-2017 12:46 PM
(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.
RE: Diagnostic Trouble Codes & Sensor testing - pdedse - 12-08-2017 03:45 PM
(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.
RE: Diagnostic Trouble Codes & Sensor testing - Cormanus - 12-08-2017 03:57 PM
Crikey!? Do we all have to publish or CVs?
RE: Diagnostic Trouble Codes & Sensor testing - Lord Popgun - 12-08-2017 04:07 PM
I was wondering that too...
RE: Diagnostic Trouble Codes & Sensor testing - SportsterDoc - 12-08-2017 04:25 PM
(12-08-2017 03:57 PM)Cormanus Wrote: Crikey!? Do we all have to publish or CVs?
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?