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this information to control solenoids on transmission valve body. TCM controls transmission shifting and torque converter lock-up. TCM contains a self-diagnostic system, which will store Diagnostic Trouble Codes (DTC) if failure or problem exists in electronic control system. DTC can be retrieved to determine problem area. See SELF-DIAGNOSTIC SYSTEM. TCM is located under left side of instrument panel, left of steering column. See Fig. 1. TCM INPUT DEVICES Brakelight Switch Signal Brakelight switch delivers input signal to TCM, indicating vehicle braking. Brakelight switch is located on brake pedal support. Cruise Control Electronic Control Unit (ECU) Cruise control ECU delivers an input signal to control overdrive operation in accordance with vehicle speed when cruise control is operating. When in overdrive with cruise control on, if vehicle speed drops 2 MPH less than the set speed, overdrive is released to prevent reduction in vehicle speed. Once vehicle speed is more than the set speed, overdrive function is resumed. If coolant temperature is low, transmission will not shift into overdrive. Cruise control ECU is located below center A/C vent, behind temperature control panel on Montero. On Montero Sport, cruise control ECU is located behind driver’s kick panel. Engine Coolant Temperature Sensor (ECT) Signal Engine coolant temperature sensor delivers input signal to TCM, indicating engine coolant temperature. Coolant temperature sensor is located on engine. Input & Output Shaft Speed Sensors Sensors are magnetic pick-ups that monitor input and output shaft speeds. AC waveforms are input to TCM by sensors. Sensors are located on front and rear side of transmission case. OD Switch Signal The OD switch provides an input signal to TCM to indicate when overdrive is selected by operator. When OD switch is depressed to ON position, transmission will shift into 4th gear when shift lever is in "D" position, and OD OFF light on instrument panel will go off. When OD switch is released to OFF position, transmission will shift into 3rd gear, and OD OFF light on instrument panel will come on. The OD switch is mounted on shift lever. Oil Temperature Sensor Signal Oil temperature sensor provides TCM with ATF temperature values. TCM uses this information to control shift points for maximum performance. If transmission oil temperature exceeds standard values, instrument panel ATF - TEMP light will come on. Sensor is mounted to cooler line at transmission. Park/Neutral Position (PNP) Switch Signal PNP switch delivers an input signal to TCM indicating shift lever position. Switch is located on side of transmission. Throttle Position (TP) Sensor Signal TP sensor delivers closed throttle and variable throttle position input signals to TCM. TP sensor is located on side of throttle body. 4WD Low Range Detection Switch 4WD low range detection switch provides information to TCM |