Honda CRF450R 2009 Service Manual page 160

FUEL SYSTEM (PGM-FI)
6-28
DTC 7-1 (ECT SENSOR LOW
VOLTAGE)
1. Eel Sensor System Inspection
Connect the 12 V battery ("ECM" selector switch is
ON).
- '09: page 6-19
- After '09: page 6-19
Check Ihe Eer
sensor
with the MeS.
Is about 0 V indicated?
YES - GO TO STEP 2.
NO - Intermittent failure
2. EeT Sensor Inspection
Tum the "ECM" selector switch OFF.
Disconnect the
E er
sensor 2P (Black) connector.
Turn Ihe "ECM" selector switch ON.
Check the
Eer
sensor with the
MeS.
Is about 0 V indicated?
YES - GO TO STEP 4 .
NO - GO TO STEP 3.
3. Eer Sensor Resistance Inspection
Turn Ihe "ECM" selector switch OFF.
Measure the resistance at the
Eer
sensor
terminals.
Standard: 2.3 - 2.6 kO (20°C/68°F)
Is the resistance within
2.3 - 2.6 kO?
YES - Replace the ECM with a known good one,
and recheck.
NO - Faulty
Eer
sensor
4. ECT Sensor Output Line Short Circuit Inspection
2P(BLACK)CONNECTOR
(Sensor side/male terminals)
Q
Turn the -ECM- selector switch OFF. , - - - - - -- - - - - -- -- - - - ,
Check for continuity between the ECT sensor 2P 2P (BLACK) CONNECTOR
(Biack) connector at the wire side and ground. (Wire sideffemale terminals)
Connection: Pink - Ground
Is there continuity?
YES - Short circuit in Pink wire
NO - Replace the ECM with a known good one,
and recheck. Q