What fuse powers the Malfunction Indicator Lamp (MIL) circuit?

Fuse 17, a 10A fuse in the fuse panel (hot in start or run), feeds the circuit via wire 640 R/Y.

When does the Malfunction Indicator Lamp illuminate?

It 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.

What does the Clutch Pedal Position (CPP) switch do?

On manual transmission vehicles it prevents engine startup with the clutch pedal released. E4OD automatic transmission vehicles use a CPP switch jumper instead.

What wire color connects the MIL to the PCM?

Circuit 658 PK/LG (pink/light green) runs from the instrument cluster through the Data Link Connector to PCM pin 17.

Which PCM pin receives the clutch pedal position signal?

Circuit 481 GY/Y carries the 12V (switch closed/start) signal to PCM pin 30 (without E4OD) at connector C165.

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Ford Bronco 5.8L Engine Controls Wiring Diagram - MIL & CPP Switch (Pg 25-5)

Wiring diagram 25-5 Engine Controls 5.8L showing MIL lamp, ignition switch, clutch pedal position switch and DLC circuits

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Engine controls wiring diagram for the 5.8L, including the malfunction indicator lamp, ignition switch, clutch pedal position switch, and data link connector.

AI caption April 2011 · Photo 958 of 2216

This is page 25-5, "Engine Controls, 5.8L," a factory-style wiring diagram covering part of the engine control circuit for a 5.8L Ford truck. It shows the Malfunction Indicator Lamp (MIL) circuit: power from fuse 17 (10A) in the fuse panel (hot in start or run) via circuit 640 R/Y through splice S215 and connector C250 to the MIL in the instrument cluster (page 60-3), then via circuit 658 PK/LG through connectors C251, C202F/C202M, the Data Link Connector (DLC), and C198F to pin 17 of the Powertrain Control Module (PCM). A note explains the MIL lights with the ignition ON before cranking, goes off after start, and is turned on by the PCM when a fault develops. A second branch shows the ignition switch (hot at all times) START feed via circuit 32 R/LB and 480 P/Y through splice S224 to either the Clutch Pedal Position (CPP) switch jumper (E4OD automatic transmission) or the CPP switch (manual transmission), which prevents engine startup with the clutch pedal released, continuing on circuit 481 GY/Y to PCM pin 30 (without E4OD) at connector C165. An A/C-heater input (198 DG/O) feeds PCM pin 10. Cross-references include Power Distribution (13-11) and Starting System (20-1).

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Frequently asked questions

What fuse powers the Malfunction Indicator Lamp (MIL) circuit?: Fuse 17, a 10A fuse in the fuse panel (hot in start or run), feeds the circuit via wire 640 R/Y.
When does the Malfunction Indicator Lamp illuminate?: It 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.
What does the Clutch Pedal Position (CPP) switch do?: On manual transmission vehicles it prevents engine startup with the clutch pedal released. E4OD automatic transmission vehicles use a CPP switch jumper instead.
What wire color connects the MIL to the PCM?: Circuit 658 PK/LG (pink/light green) runs from the instrument cluster through the Data Link Connector to PCM pin 17.
Which PCM pin receives the clutch pedal position signal?: Circuit 481 GY/Y carries the 12V (switch closed/start) signal to PCM pin 30 (without E4OD) at connector C165.