DTC P1510: Pcm Back-Up Power Supply Malfunction

Measure voltage (backprobe) between ground and PCM 26-pin harness connector "A" terminal No. 14 (White wire) with ignition off, then with engine running. Both readings should be 10-14 volts. If readings are not as specified, repair open in White wire between underhood relay/fuse block and PCM harness connector "A" terminal No. 14. If readings are as specified, check for poor connection at PCM. If connections are okay, replace PCM.