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Home >> Lexus >> 2000 >> SC 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1127: Electronic Throttle Control System (ETCS) Actuator Power Source Circuit Malfunction >> Diagnosis & Repair

Diagnosis & Repair

  1. Check ETCS fuse (15-amp) located in engine compartment fuse/relay box at right side of engine compartment. If ETCS fuse is okay, go to next step. If ETCS fuse is blown, check for short circuit in wiring harness between ETCS fuse and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary.
  2. Backprobing, measure voltage between ground and terminal No. 7 (Blue/Red wire) at ECM E19 connector. See Figure. If voltage is 9-14 volts, replace ECM and retest. If voltage is not 9-14 volts, check circuits in wiring harness between battery voltage, ETCS fuse and ECM. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair wiring as necessary.
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