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Home >> Isuzu >> 1998 >> Trooper S, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Tests W/Codes - 3.2L & 3.5L >> Self-Diagnostic Tests >> DTC P0153: Heated Oxygen Sensor (Ho2S) No. 1 Bank 2/Slow Response >> Diagnostic Aids

Diagnostic Aids

An intermittent problem can be caused by misrouted harness, rubbed-through wire insulation or broken wire inside insulation. If DTC cannot be duplicated, check scan tool FAILURE RECORDS to determine mileage since last DTC was set.

  1. Perform On-Board Diagnostic (OBD) System Check. See BASIC TESTING article. Go to next step.
  2. Start engine and allow it to reach operating temperature. Operate vehicle within conditions required to set DTC:
    • Engine in closed loop.
    • Engine running for one minute or more.
    • Engine RPM is 1500-3000.
    • Canister purge duty cycle is 2 percent or more.
    • MAF is 9-42 grams per second.
    • All conditions for 3 seconds or more.
    • Rich-to-lean transition is longer than 105 milliseconds.
    • Lean-to-Rich transition is longer than 94 milliseconds.

    Using scan tool, observe SPECIFIC DTC parameter. If scan tool displays DTC P0153 FAILED THIS IGN, go to next step. If scan tool does not display DTC P0153 FAILED THIS IGN, check for an intermittent problem, see DIAGNOSTIC AIDS  .

  3. If scan tool also displays DTC P0153, P1133, P1134, P1153 and/or P1154 FAILED THIS IGN, replace affected HO2S. Retest system. If scan tool does not display these DTCs, go to next step.
  4. Visually inspect for exhaust leaks near HO2S No. 1, bank 2. Repair as necessary, then return to step 2). If no leaks are found, go to next step.
  5. Visually inspect HO2S No. 1, bank 2 for proper installation. Check for corrosion or poor terminal contact at HO2S No. 1, bank 2 and PCM. Repair as necessary. If no problem is found, go to next step.
  6. Disconnect HO2S No. 1, bank 2 harness connector. Measure voltage between high signal circuit and ground, then between low signal circuit and ground. If reading is 3-4 volts, go to next step. If reading is not 3-4 volts, go to step 8).
  7. Connect fused jumper wire between ground and high and low signal circuits (Red and White wires - 3.2L; Blue and Pink wires - 3.5L) of HO2S No. 1, bank 2 harness connector (PCM side). Turn ignition on. Using scan tool, monitor voltage. If reading is less than 10 mV, then immediately returns to about 450 mV when jumper wire is removed, replace HO2S No. 1, bank 2. If reading is not about 450mV, replace PCM. Retest system.
  8. Inspect PCM connections and terminals for damage. Repair as necessary. Retest system. If PCM connections and terminals are okay, go to next step.
  9. Repair open, short or grounded HO2S No. 1, bank 2 high or low signal circuits. Retest system.
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