Powertrain Chart 2 - Pcm Power & Ground Check
Battery voltage is present at all times at PCM terminals No. 2B1 and 1C16 through circuit No. 480 from engine compartment fuse block, fuse B13. PCM is also fed IGN 1 (hot in run, bulb test and start) at PCM terminal No. 2A6 through circuit No. 1276 from engine compartment fuse block, fuse A9. PCM needs both battery and IGN 1 voltage to operate.
PCM grounding points are at PCM terminals No. 1D1, 1D6, 1D7 and 2A12 through circuit No. 450 to ground (circuit No. G301).
NOTE:
Test numbers refer to numbers on diagnostic chart.
- This test checks for data line codes that would indicate that entire data line is down.
- Checks for battery voltage on circuit No. 480. If voltage is measured at one terminal and not other, check circuit No. 480 for an open to connector C101. If voltage is not measured at either terminal, check fuse B13 and circuit No. 480 to C101 for an open.
- Checks circuit No. 1276 and fuse A9 for open.
- Checks for open circuit at circuit No. 450. If voltage measures greater than .1 volt on 1-3 wires, repair open to circuit No. S214. If voltage measures greater than .1 volt on all 4 wires, repair open from circuit S214 to G301 (ground).
- Checks for an open in circuit No. 450 or inside PCM.