Honda SH300 2006 Manual page 129

DTC 7-1 (ECT SENSOR LOW VOLT-
AGE)
1. ECT Sensor System Inspection
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 STEP 2.
NO – Intermittent failure
2. ECT Sensor Inspection
Turn the ignition switch "OFF".
Disconnect the ECT sensor 3P (Gray) connector.
Turn the ignition switch "ON".
Check the ECT sensor with the HDS pocket
tester.
Is about 0 V indicated?
YES – GO TO STEP 4.
NO – GO TO STEP 3.
3. ECT Sensor Resistance Inspection
Turn the ignition switch "OFF".
Measure the resistance at the ECT sensor termi-
nals.
CONNECTION: Pink/White – Green/Orange
STANDARD: 2.3 – 2.6 kΩ (20°C/68°F)
Is the resistance within 2.3 – 2.6 kΩ?
YES – Replace the ECM with a new one, and
recheck; refer to Key Registration Proce-
dures (page 23-4)
NO – Faulty ECT sensor.
4. ECT Sensor Output Line Short Circuit Inspection
Turn the ignition switch "OFF".
Disconnect the ECM 33P connector from the
module.
Check for continuity between the ECT sensor 3P
(Gray) connector terminal of the wire harness
side and ground with ECM connector discon-
nected.
Connection: Pink/White – ground
Is there continuity?
YES – Short circuit in Pink/White wire
NO – Replace the ECM with a known good
one, and recheck; refer to Key Registra-
tion Procedures (page 23-4)
FUEL SYSTEM (PGM-FI)
ECT SENSOR 3P
(Gray) CONNECTOR
P/W
G/O
3P (Gray) CONNECTOR
(Sensor side of male terminals)
3P (Gray) CONNECTOR
(Wire side of female terminal)
P/W
6-19