What EEC pins do the TAD and TAB solenoids use on an 88 Mustang GT?

The TAD solenoid uses EEC Pin #11 (Green/Black 18ga wire) and the TAB solenoid uses EEC Pin #51 (White/Red 18ga wire). The diagram notes that on 89+ Mustangs, TAD = Pin #32 and TAB = Pin #38.

What wires connect the EGR valve position (EVP) sensor to the EEC?

The EVP sensor connects via OR/WH 18ga to EEC Pin #26, BK/WH 18ga to EEC Pin #46, and BR/LG 18ga to EEC Pin #27.

What ports are on the vacuum distribution block on the driver side firewall?

Five ports: S (Source), B/R (capped), A/C (Air Cond, routing to the evaporator gasket at the passenger firewall), S/C (to the speed control/cruise control module in the driver fender well), and B/B (to the brake booster).

Where does the vapor canister connect in the vacuum system?

The fuel tank connects to the vapor canister, which routes through the CANP purge solenoid into the vacuum system.

What EEC pin controls the EGR vacuum regulator (EVR)?

The EVR is controlled through a Dark Green 18ga wire to EEC pin #33.

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1988 Ford Mustang GT 5.0 Emissions & Vacuum Line Routing Diagram

1988 Mustang 5.0 GT emissions and vacuum line routing diagram by TMoss with EEC pin callouts

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88 GT (Mustang 5.0) emissions/vacuum line diagram showing vacuum distribution block, EVR, EGR/EVP, TAD/TAB thermactor solenoids, FPR, MAP and brake booster with EEC pin numbers.

AI caption May 2012 · Photo 9 of 20

This document is a hand-drawn schematic titled "88 GT Emissions/Vacuum Lines" by TMoss, showing the emissions and vacuum line routing for a 1988 Ford Mustang GT 5.0. It diagrams the vacuum reserve (VRESER), the EGR vacuum regulator (EVR, electrically controlled via EEC pin #33 with Dark Green 18ga wire), the EGR valve and EVP position sensor with its three EEC connections (OR/WH 18ga to pin #26, BK/WH 18ga to pin #46, BR/LG 18ga to pin #27), a vacuum check valve, FPR (fuel pressure regulator) and MAP sensor connections to manifold vacuum. It also details the Thermactor system: the TAD solenoid (EEC pin #11, Green/Black 18ga) feeding the Thermactor Air Diverter ACV routing to head and converter, and the TAB solenoid (EEC pin #51, White/Red 18ga) controlling the Thermactor Air Bypass ACV connected to the air pump. The right side shows the vacuum distribution block on the driver side firewall with five ports: S (Source), B/R (capped), A/C, S/C (to speed control module), and B/B (brake booster), plus routing to the A/C reserve cannister and evaporator gasket. The fuel tank vapor canister connects through the CANP purge solenoid. A footnote states that on 89+ Mustangs, TAD = Pin#32 and TAB = Pin#38.

This document covers 1988, which may differ from this 1967 Ford Mustang.

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Frequently asked questions

What EEC pins do the TAD and TAB solenoids use on an 88 Mustang GT?: The TAD solenoid uses EEC Pin #11 (Green/Black 18ga wire) and the TAB solenoid uses EEC Pin #51 (White/Red 18ga wire). The diagram notes that on 89+ Mustangs, TAD = Pin #32 and TAB = Pin #38.
What wires connect the EGR valve position (EVP) sensor to the EEC?: The EVP sensor connects via OR/WH 18ga to EEC Pin #26, BK/WH 18ga to EEC Pin #46, and BR/LG 18ga to EEC Pin #27.
What ports are on the vacuum distribution block on the driver side firewall?: Five ports: S (Source), B/R (capped), A/C (Air Cond, routing to the evaporator gasket at the passenger firewall), S/C (to the speed control/cruise control module in the driver fender well), and B/B (to the brake booster).
Where does the vapor canister connect in the vacuum system?: The fuel tank connects to the vapor canister, which routes through the CANP purge solenoid into the vacuum system.
What EEC pin controls the EGR vacuum regulator (EVR)?: The EVR is controlled through a Dark Green 18ga wire to EEC pin #33.