Essential component of the PAM complex, a complex required for the translocation of transit peptide-containing proteins from the inner membrane into the mitochondrial matrix in an ATP-dependent manner. In the complex, it is required to stimulate activity of mtHSP70 (hsp70-5) (By similarity). Heterodimer with un-4/pam16. Component of the PAM complex, at least composed of hsp70-5/ssc1, grpe/mge1, tim44, un-4/pam16, pam17 and tim14/pam18 (By similarity). The J domain is essential for co-chaperone activity and mediates the heterodimerization with the J-like domain of PAM16. Belongs to the TIM14 family.