Suzuki VZR1800 2007 Service Manual page 283

5-82 FI SYSTEM DIAGNOSIS
Step 2
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/B wire and ground.
4) If the tester voltage indicates the battery voltage, it is good
condition.
$ Heater voltage: Battery voltage
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?
• W/B wire open or shorted to ground, or poor a
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.
NO Loose or poor contacts on the ECM coupler (ter-
minal a) or HO2 sensor coupler.
5) After repairing the trouble, clear the DTC using SDS tool.
(#5-26)
(+ W/B – - Ground)
2
2
ECM coupler (Harness side)
(Black)
V
(Gray)