The SLU also affects TCC control after the 2-3 shift. If forward and reverse are harsh or delayed, the 1-2 is harsh and 2-1 coast-down firm, the concern is often related to the SLU. As a general rule, if all shifts are harsh, check line pressure first.
AW 5 drivabilityįigure 2 highlights the more-dramatic effects that different linear-solenoid malfunctions have on shift quality or torque-converter feel at various shift points. Although most AW six-speed solenoid functions differ from those of the AW five-speed, solenoid modulator function and related problems are the one thing they have in common. Low pressure creates flared/long shifts and poor TCC application. High solenoid-modulator pressure causes harsh, bumpy shifts and tie-ups. For example, if there is bore wear at the spring end of the valve, line pressure could be 55 psi at idle, but feed to the solenoids could be reduced to only 40 psi. If SLT exceeds 90 psi, the solenoid modulator bore is worn at the inboard end.īore wear at the solenoid modulator can allow maximum pressure to be excessive, but it also can allow pressure to be lower than line pressure. If you wish to verify the regulation point, tap into SLT pressure and perform a stall test. In the AW 5, the solenoid modulator valve limits solenoid pressure to 90 psi. The function of this valve is comparable to that of a GM 4T65-E/4L80-E actuator-feed-limit valve. The flow-to and function of these solenoids overlap, which makes diagnosis difficult.Īll three solenoids are supplied a regulated oil pressure through a solenoid modulator valve. The AW 5 uses linear solenoids to control line rise (SLT), the converter clutch (SLU) and the oil flow rate and accumulation for the clutch circuits (SLS).
Other on/off-style solenoids are used to control the position of the shift valves.
The AW 5 has three types of linear solenoids ( Figure 1): SLU (black connector), SLT (blue connector) and SLS (green connector). In this article, the AW 55-50/51 five-speed (also known as AF 23/33) will be referred to as the AW 5. Essential Reading: Rebuilder, Diagnostician.Subject: Valve-body and solenoid service.
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