DTC Troubleshooting: P0301 (71), P0302 (72), P0303 (73), P0304 (74)
  1. Check for continuity between body ground and the ECM/PCM connector terminal of the problem cylinder (see table).
    PROBLEM CYLINDER
    DTC
    ECM/PCM 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/ PCM and the injector, then go to Step 40 .
NO -
Go to Step 38 .