Honda SH300 2006 Manual page 143

2. ECT sensor Output Voltage Inspection
Turn the ignition switch OFF.
Disconnect the ECT sensor 3P (Gray) connector.
Turn the ignition switch ON and engine stop
switch " ".
Measure the voltage at ECT sensor connector of
the wire harness side.
Connection: Pink/White (+) – Green/Orange (–)
Is the voltage within 4.75 – 5.25 V?
YES – GO TO STEP 3.
NO – GO TO STEP 4.
3. ECT Sensor Resistance Inspection
Turn the ignition switch OFF.
Measure the resistance at the ECT sensor termi-
nals.
Connection: Pink/white – Green/orange
(Sensor side terminals)
Standard: 2.3 – 2.6 kΩ (20°C/68°F)
Is the resistance within 2.3 – 2.6 kΩ (20°C/68°F)?
YES – Replace the ECM with a known good
one, and recheck; refer to Key Registra-
tion Procedures (page 23-4)
NO – Faulty ECT sensor.
4. ECT Sensor Output/Ground Line Open Circuit
Inspection
Turn the ignition switch OFF.
Check the continuity between the test harness
terminals and ECT sensor connector of the wire
harness side.
Connection: A24 – Pink/white
A4 – Green/orange
Is there continuity?
YES – GO TO STEP 5.
NO – • Open circuit in Pink/white wire
• Open circuit in Green/orange wire
FUEL SYSTEM (PGM-FI)
3P (Gray) CONNECTOR
(Wire side of female terminals)
P/W
G/O
3P (Gray) CONNECTOR
(Sensor side of male terminals)
3P (Gray) CONNECTOR
(Wire side of female terminals)
G/O
P/W
TEST HARNESS PIN BOX
G/O
P/W
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