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© 200438 1-17 AS Tronic fault codes AS TRONIC DAVIE XD diagnostics manual 3 3155 Main range does not switch in selected gear: insufficient air pressure available - internal modulator fault (D954); selector - mechanically defective gearbox - Gearbox does not disengage from the - If the above fault occurs when driving or - Automatic mode not available 3156 Main range engages a gear which does not - When driving and at standstill the gearbox is - Automatic mode not available 3157 Gate selection sensor signal changes when - Main valve Y10 and selector valve Y4 or Y5 - Automatic mode available 3158 Main range sensor signal changes when driving, - Main valve Y10 and selector valve Y6 or Y7 - If the last selected gear can no longer be - Automatic mode available 3159 The rear-mounted range box sensor signal - Main valve Y10 and selector valve Y8 or Y9 - If the last selected gear can no longer be - Automatic mode available 3160 The splitter range sensor signal changes when - Main valve Y10 and selector valve Y2 or Y3 - If the last selected gear can no longer be - Automatic mode available 3163 Incorrect or missing engine speed increase signal When driving: no gear changes possible - automatic mode not available At standstill: driving off from a stationary position is Fault code Fault code description with possible cause Symptom |