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Home >> Lexus >> 2000 >> LX 470 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1127: Electronic Throttle Control System Actuator Power Source Circuit >> Diagnosis & Repair

Diagnosis & Repair

  1. Remove and inspect THROTTLE fuse (15-amp) from left side engine compartment fuse block. If fuse is okay, go to next step. If fuse is blown, check for cause of fuse to blow. See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary and retest.
  2. Access ECM behind glove box. Using DVOM, backprobe and measure voltage between ground and terminal No. 7 (Yellow/Black wire) at ECM harness connector E10. See Figure. If voltage is 9-14 volts, replace ECM. If voltage is not 9-14 volts, repair open in power source circuit.
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