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Automatic transmission diagnosis for Volvo 850 AW50-42LE Electronic Controls. Vehicle is equipped with a Supplemental Restraint System (SAS). When servicing vehicle, use care to avoid accidental air bag deployment. SRS-related components are located in steering column, center console, instrument panel and lower panel on instrument panel. DO NOT use electrical test equipment on these circuits. Transaxle is equipped with a mode selector switch. Switch is used for normal, high performance and winter driving conditions. Transaxle is also equipped with a shift lock and key interlock system. Shift lock system prevents shift lever from being moved from Park position unless brake pedal is applied. Brake switch is an input device mounted above the brake pedal. When brake pedal is applied, brake switch delivers an input signal to the TCM. OIL TEMPERATURE SENSOR, MODE SELECTOR SWITCH, SHIFT LOCK OVERRIDE FUNCTION, TRANSAXLE CONTROL MODULE (TCM), VALVE BODY SOLENOIDS. DIAGNOSTIC SYSTEM FAULTS Diagnostic Unit LED Does Not Flash 1) Disconnect diagnostic unit. Turn ignition on. Check for voltage at diagnostic connector terminal No. 4. If voltage is not present, check fuse and wiring. If voltage is present, turn ignition off. If resistance is not as specified, check wiring circuit and repair as necessary. TCM WIRING CIRCUITS, complete wiring diagram.
Tags : electrical test equipment, mode selector switch, air bag deployment, winter driving conditions, supplemental restraint system, check fuse, wiring circuits, system faults, shift lock, volvo 850, diagnostic connector, diagnostic unit, complete wiring, interlock system, park position
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