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Home >> Lexus >> 2002 >> LS 430 >> 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 on driver's side wheel well. 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 WIRING DIAGRAMS article. Repair wiring as necessary.
  2. Backprobing connector, measure voltage between ground and terminal No. 7 (Yellow/Black wire) at ECM E3 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, ETCS fuse and ECM. See WIRING DIAGRAMS article. Repair wiring as necessary.
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