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Home >> Lexus >> 1997 >> GS 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Circuit Tests >> DTC P1600 - ECM Batt Malfunction >> Diagnosis & Repair

Diagnosis & Repair

  1. Access ECM behind glove box. Connect Check Harness "A" (SST 09990-01000) to ECM. See TEST PREPARATION  under SELF-DIAGNOSTIC SYSTEM section. Measure voltage between ground and terminal No. 33 (White/Blue wire) at ECM "A" 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 fuse (15-amp) from junction block No. 2, located in left side of engine compartment. 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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