Reference chart of EFI sensor values for 1984-96 engines

Sensor & Actuator Testing Values
IF THE IMAGE IS TOO SMALL, click it.
Resistance (Ohms) is measured with the device DISconnected (so the key doesn't need to be ON). Voltage is measured with the circuit complete & key in RUN, as during normal operation. Back-probe the connector, or pierce-probe the wires.

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EEC Pinouts

Wiring Diagrams

TPS to SIGRET


EVR / DPFEGR to SIGRET
.

HEGO to SIGRET
.

ECT - LG/Y or LG/R to SIGRET
ACT - Y/R or Gy to SIGRET
EVP - Br/LG to SIGRET
VPWR - R - battery voltage (~12VDC)
VREF - Br/Wh or Or/Wh - 5VDC
SIGRET - Bk/W or Gy/R - 0V (ground)

MLPS - LB/Y (TR SIgnal) to SIGRET
. . . .

MAP - difficult to test accurately; consider finding a known-good one to swap in temporarily for diagnosis
E67F-9F479-A2A Motorcraft CX-2403

MAF - fragile; do not spray or probe inside sensor; do not blow compressed air through sensor


IAC / ISC / BPA to VPWR


Automotive Terms & Abbreviations

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Owner caption February 2007 · Photo 1484 of 5000