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Home >> Mitsubishi >> 2003 >> Lancer Evolution >> Repair and Diagnosis >> External Pages >> Different car >> Section 20 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1127: Electronic Throttle Control System Actuator Power Source Circuit >> Diagnosis & Repair
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Diagnosis & Repair

WARNING: This page is about a different car, the 2002 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  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 short circuit between THROTTLE fuse and ECM. See 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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