12-07-2017, 09:17 AM
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.
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.