Common problems associated with Mazda F4EAT, F4A-EL and FA4A-EL transmissions are overheating, TCC apply and release concerns, TCC codes and lining failure. These issues can be caused by excess wear at the converter relief valve. The relief valve controls TCC flow and pressure, and this wear allows fluid to escape the circuit, negatively affecting converter operation.
Reconditioning the bore and installing Sonnax oversized converter relief valve kit 74846-08K restores hydraulic integrity for proper converter function. The hardcoat anodized aluminum valve combats premature wear.
Vacuum testing at the port(s) indicated fails to hold the recommended minimum in-Hg, or if wear is visually detected.