Suzuki TU250X, Руководство по обслуживанию

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FI SYSTEM DIAGNOSIS 4-65
7) Disconnect the ECM coupler.
8) Check the continuity between Bl/W wire
A
and terminal
K
.
9) Also, check the continuity between B/Br wire
B
and terminal
T
.

HO2S lead wire continuity: Continuity (

)

09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set

Tester knob indication: Continuity test (

)
Is the continuity OK?
Step 2
1) Connect the ECM couplers and HO2 sensor coupler.
2) Warm up the engine enough.
3) Measure the HO2 sensor output voltage between B wire and
Gr wire, when idling condition.

HO2 sensor output voltage at idle speed:
0.3 V and less (
+
B –
-
Gr)
4) If OK, then pinch the PAIR hose with proper hose clamps.
5) Measure the HO2 sensor output voltage while holding the
engine speed at 5 000 r/min.

HO2 sensor output voltage at 5 000 r/min:
0.6 V and more (
+
B –
-
Gr)

09900-25008: Multi circuit tester set
09900-25009: Needle-point probe set

Tester knob indication: Voltage (

)
Is the voltage OK?
YES Go to Step 2.
NO
Bl/W wire shorted to ground, or Bl/W or B/Br wire
open.
1
ECM coupler (Harness side)
!
2
2
YES
• Bl/W wire or B/Br wire open or shorted to
ground, or poor
K
or
T
connection.
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• Replace the ECM with a known good one, and
inspect it again.
NO Replace the HO2 sensor with a new one.
ECM coupler (Harness side)
2