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Home >> Lexus >> 1995 >> LS 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - OBD-II >> Diagnostic Testing >> Code P1600: ECM Batt Malfunction >> Diagnosis & Repair

Diagnosis & Repair

  1. Access ECM behind glove box. Backprobing ECM connector, measure voltage between ground and terminal No. 14 (Black/Yellow wire) at ECM E11 connector. See Figure. If voltage is not 9-14 volts, go to next step. If voltage is 9-14 volts, replace ECM and retest.
  2. Remove and inspect EFI 15-amp fuse from engine compartment junction block. If fuse is blown, check cause of blown fuse and repair as necessary. If fuse is okay, check and repair wiring harness or connector between battery, EFI fuse and ECM.
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