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Home >> Toyota >> 2003 >> Matrix Base, FWD, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 16 (Engine Control System 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 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove and inspect ETCS fuse (15-amp). ETCS fuse is located in fuse/relay box at driver's side front corner of engine compartment. If ETCS fuse is okay, reinstall fuse and go to next step. If ETCS fuse is defective, replace fuse and check for short in White/Green wire between ETCS fuse and ECM. See WIRING DIAGRAMS article. ECM is located behind glove box and heater duct. See Figure. Repair wiring as necessary.
  2. Remove glove box and heater duct (if necessary) for access to ECM with electrical connectors still installed on ECM. See Figure. Using voltmeter, check voltage between body ground and terminal No. 7 (White/Green wire) at ECM electrical connector E4. See Figure. This is the +BM terminal on ECM. If voltage is 9-14 volts, replace ECM. If voltage is not 9-14 volts, repair open between battery, ETCS fuse and White/Green wire and electrical connectors between ETCS fuse and ECM. See WIRING DIAGRAMS article.
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