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Home >> Isuzu >> 2007 >> Ascender 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.2L - DTC P0135 To DTC P0420 >> DTC P0325 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition ON, engine OFF.
  2. Disconnect the KS harness connector.
  3. Measure for 2-3 volts between each of the following circuits and ground on the engine control module (ECM) side of the harness connector.
    • The KS signal circuit, terminal A
    • The KS low reference circuit, terminal B
    • If less than the specified range, test the circuits for a short to ground or an open/high resistance. If the circuits test normal, replace the ECM.
    • If greater than the specified range, test the circuits for a short to voltage. If the circuits test normal, replace the ECM.
  4. If the circuits test normal, replace the KS.
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