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Home >> Toyota >> 2001 >> Corolla CE, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P1600: ECM Batt Circuit >> Diagnosis & Repair

Diagnosis & Repair

  1. Turn ignition off. Access ECM below stereo, behind instrument panel, just in front of center console. See Figure. Using DVOM, backprobe ECM harness connector. On models with 4A/T transmission, measure voltage between ground and terminal No. 1 (Red/White wire) at ECM harness connector E10. See Figure. On models without 4A/T transmission, measure voltage between ground and terminal No. 1 (Red/White wire) at ECM harness connector E6. See Figure. On all models, voltage should be 9-14 volts. If voltage is as specified, replace ECM. If voltage is not as specified, go to next step.
    2. NOTE: EFI fuse may also be referred to as F-HTR fuse.
  2. Remove and inspect EFI fuse (15-amp). EFI fuse is located in engine room junction box. Replace fuse as necessary. If fuse is okay, check circuit between EFI fuse and ECM. See WIRING DIAGRAMS article. Repair wiring as necessary.
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