Honda Crf250l Service Manual

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PGM-FI SYSTEM
3. MAP Sensor System Inspection 2Turn the ignition switch OFF.
Disconnect the sensor unit 5P connector [1].
Connect the sensor unit 5P connector terminals at
the wire side with a jumper wire [2].
Turn the ignition switch ON and engine stop switch
.
Check the MAP sensor with the HDS pocket tester.
Is about 0 V indicated?
YES – Faulty sensor unit (MAP sensor)
NO – GO TO STEP 4.
4. MAP Sensor Output Line Open Circuit Inspection
Turn the ignition switch OFF.
Remove the...

4-13
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PGM-FI SYSTEM
DTC 7-1 (ECT SENSOR LOW VOLTAGE)
1. ECT Sensor System InspectionTurn the ignition switch ON and engine stop switch
.
Check the ECT sensor with the HDS pocket tester.
Is about 0 V indicated?
YES – GO TO STEP 2.
NO – Intermittent failure
2. ECT Sensor Inspection Turn the ignition switch OFF.
Disconnect the ECT sensor 3P connector.
Turn the ignition switch ON and engine stop switch
.
Check the ECT sensor with the HDS pocket tester.
Is about 0 V indicated?
YES – GO TO...

4-14
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PGM-FI SYSTEM
DTC 7-2 (ECT SENSOR HIGH VOLTAGE)
1. ECT Sensor System InspectionTurn the ignition switch ON and engine stop switch
.
Check the ECT sensor with the HDS pocket tester.
Is about 5 V indicated?
YES – GO TO STEP 2.
NO –  • Intermittent failure
 • Loose or poor contact on the ECT
sensor 3P connector
2. ECT Sensor Inspection Turn the ignition switch OFF.
Disconnect the ECT sensor 3P connector [1].
Connect the ECT sensor 3P connector terminals at
the wire side with a...

4-15
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PGM-FI SYSTEM
DTC 8 (TP SENSOR) 
Probable cause
 • Open circuit in Yellow/red wire between the sensor unit and ECM
 • Open or short circuit in Yellow wire between the sensor unit and ECM
 • Open circuit in Green/white wire between the sensor unit and ECM
 • Faulty sensor unit
 • Faulty ECM
DTC 8-1 (TP SENSOR LOW VOLTAGE)
1. TP Sensor System Inspection
Turn the ignition switch ON and engine stop switch
.
Check the TP sensor with the HDS pocket tester
when the throttle fully...

4-16
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PGM-FI SYSTEM
4. TP Sensor Output Line Open Circuit InspectionDisconnect the ECM 33P (Black) connector [1].
Check for continuity between the ECM 33P (Black)
connector and sensor unit 5P connector [2] of the
wire side.
Is there continuity?
YES – GO TO STEP 5.
NO – Open circuit in Yellow wire
5. TP Sensor Inspection Replace the sensor unit with a known good one
(page 4-44).
Connect the sensor unit  5P and ECM 33P (Black)
connectors.
Erase the DTC’s (page 4-5).
Turn the ignition...

4-17
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PGM-FI SYSTEM
3. TP Sensor Resistance InspectionTurn the ignition switch OFF.
Disconnect the ECM 33P (Black) connector [1].
Measure the resistance at the ECM 33P (Black)
connector of the wire side.
Is the resistance within 0.29 – 0.71  Ω?
YES – GO TO STEP 4.
NO – Faulty sensor unit (TP sensor)
4. TP Sensor Power Input Voltage Inspection Connect the ECM 33P (Black) connector.
Disconnect the sensor unit 5P connector [1].
Turn the ignition switch ON and engine stop switch
.
Measure...

4-18
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PGM-FI SYSTEM
DTC 9-1 (IAT SENSOR LOW VOLTAGE)
1. IAT Sensor System InspectionTurn the ignition switch ON and engine stop switch
.
Check the IAT sensor with  the HDS pocket tester.
Is about 0 V indicated?
YES – GO TO STEP 2.
NO – Intermittent failure
2. IAT Sensor Inspection Turn the ignition switch OFF.
Disconnect the sensor unit 5P connector.
Turn the ignition switch ON and engine stop switch
.
Check the IAT sensor with  the HDS pocket tester.
Is about 0 V indicated?
YES – GO...

4-19
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PGM-FI SYSTEM
3. IAT Sensor InspectionTurn the ignition switch OFF.
Disconnect the sensor unit 5P connector [1].
Connect the IAT sensor terminals at the wire side
with a jumper wire [2].
Turn the ignition switch ON and engine stop switch
.
Check the IAT sensor with the HDS pocket tester.
Is about 0 V indicated?
YES – Faulty sensor unit (IAT sensor)
NO – GO TO STEP 4.
4. IAT Sensor Voltage Input Line Open Circuit Inspection
Turn the ignition switch OFF.
Disconnect the ECM 33P...

4-20
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PGM-FI SYSTEM
DTC 11-1 (VS SENSOR)
1. VS Sensor System InspectionErase the DTC’s (page 4-5).
Test ride the motorcycle.
Stop the engine.
Turn the ignition switch ON and engine stop switch
.
Check the VS sensor with the HDS.
Is DTC 11
–1 indicated?
YES – GO TO STEP 2.
NO –  • Intermittent failure
 • Loose or poor contact on the VS sensor
3P (Blue) connector
2. Speedometer Inspection Inspect the speedometer (page 20-5).
Is the speedometer normal?
YES – GO TO STEP 3.
NO – Replace or...

4-21
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PGM-FI SYSTEM
DTC 12 (INJECTOR)
Before starting the inspection, check for loose or poor  contact on the injector 2P (Gray) connector and recheck
the MIL blinking.
Probable cause
 • Open circuit in Black/blue wire between the engine
stop switch and injector
 • Open or short circuit in Pink/white wire between the
injector and ECM
 • Faulty injector
 • Faulty ECM
DTC 12-1 (INJECTOR)
1. Injector System Inspection
Erase the DTC’s (page 4-5).
Turn the ignition switch ON and engine stop...