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Power & Ground Circuits Toyota 4Runner III

Engine Controls - System & Component Testing - 4-CYLINDER 1 illustration ~142 words

Power & Ground Circuits

For testing of Engine Control Module (ECM) power and ground circuits, see PIN VOLTAGE CHARTS article. See ECM LOCATION table for identifying ECM mounting locations.

Model(1) Location
Camry & Camry SolaraBehind Glove Box
CelicaBelow Passenger's Side Of Instrument Panel, Underneath Carpet Near Center Console
CorollaBehind Stereo On Instrument Panel, Just In Front Of Center Console
RAV4Behind Instrument Panel, Near Front Of Center Console
Tacoma & 4RunnerBehind Glove Box
(1) For illustration of ECM location, see THEORY & OPERATION article.
(1)For illustration of ECM location, see THEORY & OPERATION article.

ECM LOCATION

Scheme 107

Scheme 107: Camry & Camry Solara
Scheme 107: Camry & Camry Solara
  1. Disconnect electrical connector for A/C compressor lock sensor. A/C compressor lock sensor is located near front of A/C compressor and electrical connector is located near generator. (Scheme 107) This is the electrical connector for A/C compressor lock sensor and magnetic clutch on front of A/C compressor.
  2. Using ohmmeter, check resistance between terminals No. 1 and 2 on electrical connector for A/C compressor lock sensor. (Scheme 107) Resistance should be 65-125 ohms at 68°F (20°C). Replace A/C compressor lock sensor if resistance is not within specification. It may be necessary to replace A/C compressor along with A/C compressor lock sensor if resistance is not within specification.