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4-90 FI SYSTEM DIAGNOSIS
Step 2 (When indicating C44/P0135:)
1) Connect the HO2 sensor coupler.
2) Insert the needle pointed probe 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?
5) After repairing the trouble, clear the DTC using SDS tool.
(4-27)
YES
• O/W or W wire open or shorted to ground, or
poor ‘a connection.
• Recheck each terminal and wire harness for
open circuit and poor connection.
• If wire and connection are OK, intermittent trou-
ble or faulty ECM.
• Replace the ECM with a known good one, and
inspect it again.
NO
• Open or short circuit in the W/B wire or O/W
wire.
• Loose or poor contacts on the ECM coupler
(Terminal a) or HO2 sensor coupler.
When using the multi-circuit tester, do not storongly
touch the terminal of the ECM coupler with a needle
pointed tester probe to prevent the terminal damage
or terminal bend.
2
V
ECM couplers (Harness side)
2