Which PCM pins receive 12V battery power from the battery junction box?

PCM pins 71 and 97 receive 12V power on circuit 361 (RD wire) from fuse J in the battery junction box, via splice S127.

What wire colors and circuits are used for the Mass Air Flow (MAF) sensor?

The MAF sensor uses circuit 570 BK/WH (0V ground), 967 LB/RD to PCM pin 88, and 968 TN/LB to PCM pin 36 through connector C141, with a 12V feed on 361 RD.

What does the MAF sensor do according to this diagram?

The callout states it measures the amount of intake air and is used by the PCM to help calculate fuel delivery.

How are fuel injectors #7 and #8 wired to the PCM?

Both injectors get 12V on circuit 361 RD (from S131). Injector #7 is controlled via 561 TN/RD to PCM pin 72 through C131; injector #8 via 562 LB to PCM pin 98 through C132 and connectors C120F/C120M and C174.

Which circuits connect the PCM to the Data Link Connector (DLC)?

PCM pin 16 uses 914 TN/OG to DLC pin 2, pin 15 uses 915 PK/LB (multiplex communication network, DIA. 14-2), and pin 13 uses 107 VT through C158M/C158F and C228F to DLC pin 13.

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Ford PCM Power & Ground Wiring Diagram - MAF, TSS, Injectors 7-8, DLC Circuits

Wiring diagram for mass air flow, fuel pump relay, injectors and powertrain control module circuits

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Wiring diagram routing battery junction box, MAF sensor, fuel pump relay and injector circuits into the powertrain control module.

AI caption April 2010 · Photo 1483 of 4867

This is a Ford electrical wiring diagram page showing power feeds and grounds for the Powertrain Control Module (PCM), with the battery-supplied hot feeds highlighted in red by the uploader. Power originates from the Battery Junction Box (fuse J, referenced to DIA. 27-1) on circuit 361 RD, which splices at S127 and distributes to the fuel pump high/low relay, fuel pump relay, inertia switch relay, C120, and to PCM 12V power pins 71 and 97. The diagram also shows the Mass Air Flow (MAF) sensor circuit (with a note explaining it measures intake air for PCM fuel delivery calculations) using circuits 570 BK/WH, 967 LB/RD, and 968 TN/LB to PCM pins 88 and 36; the Turbine Shaft Speed (TSS) sensor on circuits 971 PK/BK and 970 DG/WH to pin 59; and fuel injectors #7 and #8 fed by 361 RD and controlled via 561 TN/RD (pin 72) and 562 LB (pin 98). PCM pins 16, 15, and 13 connect to the Data Link Connector (DLC) via circuits 914 TN/OG, 915 PK/LB, and 107 VT. Grounds route through S100 on 570 BK/WH to G100, with references to grounds diagram DIA. 10-2 and multiplex network DIA. 14-2.

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Frequently asked questions

Which PCM pins receive 12V battery power from the battery junction box?: PCM pins 71 and 97 receive 12V power on circuit 361 (RD wire) from fuse J in the battery junction box, via splice S127.
What wire colors and circuits are used for the Mass Air Flow (MAF) sensor?: The MAF sensor uses circuit 570 BK/WH (0V ground), 967 LB/RD to PCM pin 88, and 968 TN/LB to PCM pin 36 through connector C141, with a 12V feed on 361 RD.
What does the MAF sensor do according to this diagram?: The callout states it measures the amount of intake air and is used by the PCM to help calculate fuel delivery.
How are fuel injectors #7 and #8 wired to the PCM?: Both injectors get 12V on circuit 361 RD (from S131). Injector #7 is controlled via 561 TN/RD to PCM pin 72 through C131; injector #8 via 562 LB to PCM pin 98 through C132 and connectors C120F/C120M and C174.
Which circuits connect the PCM to the Data Link Connector (DLC)?: PCM pin 16 uses 914 TN/OG to DLC pin 2, pin 15 uses 915 PK/LB (multiplex communication network, DIA. 14-2), and pin 13 uses 107 VT through C158M/C158F and C228F to DLC pin 13.