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Home >> Toyota >> 2002 >> ECHO 4D Sedan, 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 behind glove box. See Figure. Using DVOM, backprobe ECM harness connector and measure voltage between ground and terminal No. 1 (Black/Yellow wire) at ECM harness connector E4. See Figure. Voltage should be 9-14 volts. If voltage is not as specified, go to next step. If voltage is as specified, replace ECM.
  2. Remove and inspect EFI fuse (15-amp). EFI fuse is located in engine room junction box. If fuse is blown, repair short to ground in power distribution circuit as necessary and replace fuse. If fuse is okay, check circuit between EFI fuse and ECM. See WIRING DIAGRAMS article. It may be necessary to check wiring between battery and EFI fuse. For additional wiring for EFI fuse to the battery, see POWER DISTRIBUTION article in WIRING DIAGRAMS . Repair wiring as necessary.
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