Suzuki VL800 Service Manual page 576

18-36 VL800/C/TK9 ('09-MODEL)
Step 2 (Heater circuit check)
1) Connect the HO2 sensor coupler.
2) Insert the needle pointed probes to the HO2 sensor coupler.
3) Turn the ignition switch ON and measure the heater voltage
between W (O/W) wire and ground.
4) If the tester voltage indicates the battery voltage, it is good
condition.
 Heater voltage: Battery voltage (+ W – - Ground)
NOTE:
Battery voltage can be detected only before starting the engine.
 09900-25008: Multi-circuit tester set
09900-25009: Needle pointed probe set
 Tester knob indication: Voltage ()
Is the voltage OK?
• O/W or W/B wire open or shorted to ground, or
poor G connection.
• Recheck each terminal and wire harness for
open circuit and poor connection.
YES
• If wire and connection are OK, intermittent trou
ble or faulty ECM.
• Replace the ECM with a known good one and
inspect it again.
• Open or short circuit in the W/B wire or O/W
wire.
NO
• Loose or poor contacts on the ECM coupler
(terminal G) or HO2 sensor coupler.
"C49" (P1656) PAIR CONTROL SOLENOID VALVE CIRCUIT MALFUNCTION
On model K9, the connector terminals to be used for checking
sensors for voltage, resis ance or continuity at the ECM terminal
are located as shown in the illustration.
* Refer to page 14-83 for details.
2
2
ECM coupler (Harness side)
ECM coupler (Harness side)
V