Honda Transalp XL700V Manual page 166

4. O Sensor Inspection
2
Replace the O sensor with a known good one
2
(page 5-84).
Clear the DTC's (page 5-15).
Start the engine and warm it up to coolant tem-
perature is 80°C (176°F).
Check the O sensor with the HDS.
2
Is the DTC21-1 indicated?
NO – Faulty original O
YES – Replace the ECM with a new one. and
recheck; for Key Registration Proce-
dures (page 21-4).
DTC 23-1 (O SENSOR HEATER)
2
• Before starting the inspection, check for loose or
poor contact on the O sensor 4P (Black) connec-
2
tor and ECM 33P connectors, then recheck the
DTC.
1. O Sensor Heater System Inspection
2
Clear the DTC's (page 5-15).
Start the engine and check the O
with the HDS.
Is the DTC 23-1 indicated?
YES – GO TO STEP 2.
NO – Intermittent failure
2. O Sensor Heater Resistance Inspection
2
Turn the ignition switch OFF.
Disconnect the O sensor 4P (Black) connector.
2
Measure the resistance at the O
(Black) connector of the sensor side.
Connection: White – White
Is the resistance within 10 – 16 Ω (20 ° C/68 ° F)?
YES – GO TO STEP 3.
NO – Faulty O sensor
2
3. O Sensor Heater Power Input Line Inspection
2
Turn the ignition switch ON and engine stop
switch " ".
Measure the voltage between the O
(Black) connector of the wire harness side and
ground.
Connection: Black/white (+) – Ground (–)
Is there the battery voltage?
YES – GO TO STEP 4.
NO – Open circuit in Black/white wire
sensor
2
sensor heater
2
O
(Sensor side/female terminal)
sensor 4P
2
sensor 4P
2
O
(Wire side/male terminal)
FUEL SYSTEM (PGM-FI)
SENSOR 4P (BLACK) CONNECTOR
2
W W
Bl/W
SENSOR 4P (BLACK) CONNECTOR
2
5-35