1992-1995 4.0 EEC-IV PCM Schematic
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Fleet Mechanic
Joined: Nov 2011
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From: New York
1992-1995 4.0 EEC-IV PCM Schematic
Does anyone have this, or even just the pin-out list? I have a '95 Aerostar 4.0 EEC-IV PCM that I'm wanting to swap in for testing purposes into a '92 Ranger 4.0. I can move a few pins around if needed, but can't find the schematic on-line at all.
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Fleet Mechanic
Joined: Nov 2011
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From: New York
Any idea where that circuit goes from pin 46? It's Gray/Red, the same as the shared Signal Rtn for IAT, TPS, ECT.
Lead Driver
Joined: Sep 2003
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From: SoCal
On other cars (Mustangs), pin 46 is labeled "Signal Return", and noting that it is common to one side of a number of sensors, I would guess it's like the ground side of the sensors, but referenced by the EEC, vs chassis ground. The other side of sensors that need a reference voltage from the EEC are connected to pin 26. In the Mustang, it is connected to the TPS, MAP and EVP sensors, but on the 95 Aero, it's just the TPS.
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Fleet Mechanic
Joined: Nov 2011
Posts: 1,823
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From: New York
Thanks. Yes, pin 46 is consistently Sgnl Rtn. The Chilton schematic you shared just opted not to show where it went. The good news is that the '95 Aero didn't go SEFI so I can interchange it with the Ranger and pre-'94 Explorer PCM's, if only for testing purposes. They're pretty much identically wired. .
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