DTC Troubleshooting: P0301 (71), P0302 (72), P0303 (73), P0304 (74)
  1. Check for continuity between body ground and the ECM connector terminal of the problem cylinder (see table).
    PROBLEM CYLINDER
    DTC
    ECM TERMINAL
    WIRE COLOR
    No. 1
    P0301
    C5
    BRN
    No. 2
    P0302
    C6
    RED
    No. 3
    P0303
    C7
    BLU
    No. 4
    P0304
    C8
    YEL

Is there continuity?
YES -
Repair short in the wire between the ECM and the injector, then go to Step 40 .
NO -
Go to Step 38 .