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GOVERNOR PRESSURE SOLENOID VALVE The solenoid valve is a duty-cycle solenoid which regulates the governor pressure needed for upshifts The inlet side of the solenoid valve is exposed to normal transmission line pressure. The outlet side of The solenoid valve regulates line pressure to pro- duce governor pressure. The average current sup- The powertrain control module (PCM) turns on the trans control relay which supplies electrical power to GOVERNOR PRESSURE SENSOR The governor pressure sensor measures output pressure of the governor pressure solenoid valve (Fig. The sensor output signal provides the necessary feedback to the PCM. This feedback is needed to ade- GOVERNOR BODY AND TRANSFER PLATE The transfer plate is designed to supply transmis- sion line pressure to the governor pressure solenoid The governor pressure solenoid valve is mounted in the governor body. The body is bolted to the lower TRANSMISSION FLUID TEMPERATURE Transmission fluid temperature readings are sup- plied to the transmission control module by the ther- The PCM prevents engagement of the converter clutch and overdrive clutch, when fluid temperature If fluid temperature exceeds 126°C (260°F), the PCM causes a 4-3 downshift and engage the con- The overdrive OFF lamp in the instrument panel illuminates when the shift back to third occurs. The The thermistor is part of the governor pressure sensor assembly and is immersed in transmission TRANSMISSION SPEED SENSOR The speed sensor (Fig. 5) is located in the over- drive gear case. The sensor is positioned over the Fig. 3 Governor Pressure Solenoid Valve 1 – SOLENOID FILTER Fig. 4 Governor Pressure Sensor 1 – RETAINING CLIP TEMPERATURE THERMISTOR 21 - 6 TRANSMISSION AND TRANSFER CASE WJ DESCRIPTION AND OPERATION (Continued) 2000 JEEP GRAND CHEROKEE |