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Home >> Isuzu >> 1995 >> Trooper LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests - DOHC >> Diagnostic Charts >> Chart C-1F - Oxygen Sensor Heater Check >> Notes
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Chart C-1F - Oxygen Sensor Heater Check: Notes

Generator charging circuit supplies battery voltage to heater part of oxygen sensor. Heater warms oxygen sensor to allow a varying voltage to be produced by oxygen sensor.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. This step will verify battery voltage is present for heater. Wire identified as Blue, HO2S signal circuit, could be Light Blue or Red/Blue.
  2. This step checks ground circuit to heater.
  3. This step checks heater element resistance.
Fig 1: Chart C-1F - Schematic
G93D79296Courtesy of ISUZU MOTOR CO.
Fig 2: Chart C-1F - Diagnostic Flowchart
G93E79297Courtesy of ISUZU MOTOR CO.
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