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Home >> Toyota >> 2001 >> 4Runner Base >> Repair and Diagnosis >> Engine Performance >> System >> 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

  1. Remove ETCS fuse (15-amp) from fuse/relay box at driver's side front corner of engine compartment. Inspect ETCS fuse. If ETCS fuse is okay, reinstall fuse and go to next step. If ETCS fuse is defective, replace fuse and check for short in Green wire between ETCS fuse and ECM. See WIRING DIAGRAMS article. ECM is located behind glove box. See Figure. Repair wiring as necessary.
  2. Remove glove box for access to ECM with electrical connectors still installed on ECM. See Figure. Using voltmeter, check voltage between body ground and terminal No. 8 (Green wire) at ECM electrical connector E14. 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 Green wire and electrical connectors between ETCS fuse and ECM. See WIRING DIAGRAMS article.
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