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DTC P1298 - ELECTRICAL LOAD DETECTOR (ELD) HIGH VOLTAGE INPUT Isuzu Oasis I

Testing & Diagnostics ~260 words
  1. Perform PCM reset procedure. See «TESTS W/CODES - INTRODUCTION»(ref-16345) article. Start engine and turn headlights on. If DTC P1298 is indicated, go to next step. If DTC P1298 is not indicated, problem is intermittent. System is okay at this time. Check for poor connections or loose wires between ELD and PCM connectors. See WIRING DIAGRAMS article.
  2. Turn ignition and headlights off. Disconnect ELD 3-pin connector located in underhood fuse/relay box. Check for continuity between ground and ELD connector terminal No. 1 (Black wire). (Схема №11) If continuity exists, go to next step. If continuity does not exist, repair open in Black wire between ELD and ground connection G402 located behind right side of glove box. See WIRING DIAGRAMS article.
  3. Disconnect PCM 32-pin connector "A". Check for continuity between ELD connector terminal No. 2 (Green/Red wire) and PCM 32-pin connector "A" terminal A30. (Схема №1)and (Схема №11). If continuity exists, go to next step. If continuity does not exist, repair open in Green/Red wire between PCM and ELD. See WIRING DIAGRAMS article.
  4. Ensure ignition is off. Reconnect ELD 3-pin connector and PCM 32-pin connector "A". Start engine and allow it to idle. Using backprobe kit, measure voltage between PCM 32-pin connector "A" terminal A30 (Green/Red wire) and PCM 25-pin connector "B" terminal B20 (Brown/Black wire). (Схема №1)and (Схема №2). While measuring voltage, turn headlights on low. If voltage does not decrease, replace ELD. If voltage decreases, substitute a known-good PCM and recheck. If symptom or problem goes away, replace original PCM.

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