What wire colors go to each fuel injector on this diagram?

All injectors are fed 361 Red (12 V in START or RUN). The PCM-side control wires are: injector #1 (C164) 555 T, injector #2 (C167) 556 W, injector #3 (C168) 557 BR/Y, and injector #4 (C161) 558 R, going to PCM pins 75, 101, 74 and 71 respectively.

What does the EGR Vacuum Regulator (EVR) solenoid do according to this diagram?

The callout states it regulates the vacuum level present in the EGR valve to control exhaust gas flow into the intake manifold; the PCM controls EGR by varying the voltage applied to the solenoid. Its control circuit is 360 BR/PK to PCM pin 47 through connector C184.

What is the resistance specification shown for the Vehicle Speed Sensor (VSS)?

The diagram lists the VSS (connector C178) as 190 to 300 ohms. It uses circuits 679 GY/BK and 676 PK/O, passing through connectors C116M/C116F and splice S157.

How is the Mass Air Flow (MAF) sensor wired on this page?

The MAF sensor is fed 361 R from splice S124 (page 25-4). Its signal/return circuits are 967 LB/R, 968 T/LB and 969 BK to PCM pins 967, 968 and 969 via connectors C111F/C111M, with the ground side running 570 BK/W through splice S105 to ground G101.

How does the Idle Air Control (IAC) valve work per this diagram?

The note says the IAC controls idle speed by receiving duty-cycle signals from the PCM, which controls a solenoid that opens or closes the air bypass passage. It is fed 361 R and its control wire is 264 W/LB to PCM pin 83 via connector C156.

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Ford PCM Wiring Diagram - Fuel Injectors, EGR/EVR, IAC, VSS & MAF Circuits

Fuel injector, EGR and IAC wiring diagram connected to PCM with color codes

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Wiring diagram of fuel injectors 1-4, EGR vacuum regulator, IAC valve and vehicle speed sensor circuits to the PCM with color codes.

AI caption March 2015 · Photo 71 of 343

This scan is one page of a Ford powertrain wiring diagram set covering the fuel injection and engine-management circuits. It shows fuel injectors #1–#4 (connectors C164, C167, C168, C161), the EGR Vacuum Regulator (EVR) solenoid (C184), and the Idle Air Control (IAC) valve (C156), all fed by circuit 361 (Red) in START or RUN from splice S124, with their control wires (555 T, 556 W, 557 BR/Y, 360 BR/PK, 264 W/LB, 558 R) terminating at Powertrain Control Module connector C202 pins 75, 101, 74, 47, 83, 71 and 97. The lower half traces the 679 GY/BK signal-return network linking the Compass/Outside Air Temperature module, Message Center, Generic Electronic Module (GEM), and Instrument Cluster, plus the Vehicle Speed Sensor (C178, 190–300 ohms) and Speed Control Servo/Amplifier on circuit 676 PK/O. The Mass Air Flow (MAF) sensor circuits 967 LB/R, 968 T/LB and 969 BK connect to the PCM through C111F/C111M, grounding through 570 BK/W to G101. A 4R70W transmission feed via C180 and off-page references (pages 25-2, 25-3, 25-4, 25-7, 30-3, 31-2, grounds 10-1/10-6) tie this page to the rest of the set. Explanatory notes describe EVR, IAC, and MAF operation.

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Frequently asked questions

What wire colors go to each fuel injector on this diagram?: All injectors are fed 361 Red (12 V in START or RUN). The PCM-side control wires are: injector #1 (C164) 555 T, injector #2 (C167) 556 W, injector #3 (C168) 557 BR/Y, and injector #4 (C161) 558 R, going to PCM pins 75, 101, 74 and 71 respectively.
What does the EGR Vacuum Regulator (EVR) solenoid do according to this diagram?: The callout states it regulates the vacuum level present in the EGR valve to control exhaust gas flow into the intake manifold; the PCM controls EGR by varying the voltage applied to the solenoid. Its control circuit is 360 BR/PK to PCM pin 47 through connector C184.
What is the resistance specification shown for the Vehicle Speed Sensor (VSS)?: The diagram lists the VSS (connector C178) as 190 to 300 ohms. It uses circuits 679 GY/BK and 676 PK/O, passing through connectors C116M/C116F and splice S157.
How is the Mass Air Flow (MAF) sensor wired on this page?: The MAF sensor is fed 361 R from splice S124 (page 25-4). Its signal/return circuits are 967 LB/R, 968 T/LB and 969 BK to PCM pins 967, 968 and 969 via connectors C111F/C111M, with the ground side running 570 BK/W through splice S105 to ground G101.
How does the Idle Air Control (IAC) valve work per this diagram?: The note says the IAC controls idle speed by receiving duty-cycle signals from the PCM, which controls a solenoid that opens or closes the air bypass passage. It is fed 361 R and its control wire is 264 W/LB to PCM pin 83 via connector C156.