4.3GXiE-P; 4.3GXiE-Q Ignition Stand-alone HCU and Cables 8.1GiE-P, 8.1GXiE-P Parts on group Stand-alone HCU and Cables: Pos. Part No Qty Parts name Comments 1. 21520222 [1] Control unit HCU, Replaced by next part number 1. 21847518 [1] Control unit HCU, Replaced by next part number 1. 22296662 [1] Control unit HCU, Replaced by next part number 1. 22498021 [1] Control unit HCU 2. 21460908 [1] Converter Parts catalog : Ignition 4.3GXiE-P, 4.3GXiE-Q Electronic Engine Control 4.3GXiE-P, 4.3GXiE-Q