What fuse powers the Malfunction Indicator Lamp (MIL) on the 5.0L engine controls circuit?

Fuse 17, a 10A fuse in the fuse panel (Hot in Start or Run), feeding wire 640 R/Y. See Power Distribution page 13-16 and fuse panel pages 13-3, 13-9.

What wire colors connect the MIL to the PCM?

Wire 640 R/Y feeds the MIL in the instrument cluster; from the MIL, wire 658 PK/LG runs through C251, C202, the VIP Data Link Connector, and C198 to PCM pin 17.

When does the Malfunction Indicator Lamp light?

The indicator lights with the ignition switch in the ON position prior to cranking and goes off when the engine starts. If a fault develops in the engine control system, the PCM turns the indicator on.

How does the Clutch Pedal Position (CPP) switch circuit differ by transmission?

Manual transmissions use an actual CPP switch that prevents engine startup with the clutch pedal released; E4OD/4R70W and C6 automatic transmissions use a CPP switch jumper instead. All versions receive 12V (start) on wire 480 P/Y at C261 and output on wire 481 GY/Y.

Which PCM pins are shown on this diagram?

Pin 17 (MIL circuit, 658 PK/LG), pins 5 and 29 (with 4R70W: 970 DG/W and 766 BK/LG), pins 10 and 43 (without E4OD or 4R70W: 883 PK/LB and 348 P from A/C-heater), and pin 30 (without E4OD or 4R70W: 481 GY/Y start/switch-closed signal).

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1996 Ford Bronco 5.0L Engine Controls Wiring Diagram 24-7 - PCM, MIL, CPP Switch

Engine Controls wiring diagram, 5.0L, page 24-7, ignition switch, MIL and clutch pedal switches

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Ford 5.0L engine controls wiring diagram showing ignition switch, malfunction indicator lamp and clutch pedal position switch circuits.

AI caption August 2018 · Photo 371 of 386

This document is page 24-7 of a Ford wiring diagram set covering Engine Controls for the 5.0L engine. It shows the power feed circuits into the Powertrain Control Module (PCM). On the left, a Hot-in-Start-or-Run circuit runs from fuse 17 (10A) in the fuse panel through wire 640 R/Y via splice S215 and connector C250 to the Malfunction Indicator Lamp (MIL) in the instrument cluster, then continues as wire 658 PK/LG through C251, C202, the VIP Data Link Connector and C198 to PCM pin 17. A note explains the MIL lights with the ignition ON before cranking, goes off after start, and is turned on by the PCM if a fault develops. On the right, a Hot-at-All-Times feed through the ignition switch (C269, wire 32 R/LB, splice S224, wire 480 P/Y) passes through the Clutch Pedal Position (CPP) switch or jumper — three variants are shown for E4OD/4R70W, manual, and C6 transmissions — continuing as wire 481 GY/Y to C185 and PCM pin 30. Additional PCM circuits shown include 4R70W transmission wires 970 DG/W and 766 BK/LG (pins 5 and 29) and A/C-heater wires 883 PK/LB and 348 P (pins 10 and 43). Cross-references point to power distribution, starting system, ignition switch, cluster, and A/C pages.

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Frequently asked questions

What fuse powers the Malfunction Indicator Lamp (MIL) on the 5.0L engine controls circuit?: Fuse 17, a 10A fuse in the fuse panel (Hot in Start or Run), feeding wire 640 R/Y. See Power Distribution page 13-16 and fuse panel pages 13-3, 13-9.
What wire colors connect the MIL to the PCM?: Wire 640 R/Y feeds the MIL in the instrument cluster; from the MIL, wire 658 PK/LG runs through C251, C202, the VIP Data Link Connector, and C198 to PCM pin 17.
When does the Malfunction Indicator Lamp light?: The indicator lights with the ignition switch in the ON position prior to cranking and goes off when the engine starts. If a fault develops in the engine control system, the PCM turns the indicator on.
How does the Clutch Pedal Position (CPP) switch circuit differ by transmission?: Manual transmissions use an actual CPP switch that prevents engine startup with the clutch pedal released; E4OD/4R70W and C6 automatic transmissions use a CPP switch jumper instead. All versions receive 12V (start) on wire 480 P/Y at C261 and output on wire 481 GY/Y.
Which PCM pins are shown on this diagram?: Pin 17 (MIL circuit, 658 PK/LG), pins 5 and 29 (with 4R70W: 970 DG/W and 766 BK/LG), pins 10 and 43 (without E4OD or 4R70W: 883 PK/LB and 348 P from A/C-heater), and pin 30 (without E4OD or 4R70W: 481 GY/Y start/switch-closed signal).