MPFI ECU Code : P28 ZC (similar to D16Y4, D16A8, D16Z6, D16A1, D16A3, D16A6, D16A9 and D16Z5 engines) A few D-series variants are labelled ( Japanese : Honda ZC engine ) (usually JDM), but they are not truly a different series. There are both SOHC and DOHC ZC engines. The non-VTEC