What circuits connect the PCM to the Crankshaft Position (CKP) sensor?

Circuits 727 GN and 728 BL, with a shielded ground circuit 65 BK/R, routed through connectors C246, C151/C126, and C123 to the CKP sensor.

How is the Engine Coolant Temperature (ECT) sensor wired to the PCM?

Circuit 724 R/GN runs from the PCM through connector C247 to the ECT sensor at C143, and the sensor grounds via circuit 62 BK/BL through joint connector C106 to ground G106.

What does the PCM use the ECT sensor signal for according to this diagram?

The note states the ECT sensor measures engine coolant temperature and is used by the PCM to determine coolant fan and A/C operation.

Which circuits connect the PCM to the Transaxle Control Module (TCM)?

On automatic transaxle vehicles only, circuit 369 GN/R and circuit 746 BL connect through connectors C241, C240, C249, C259, S296, and C248 to the TCM (page 29-6).

What do the asterisk marks on connectors C151 and C126 mean?

A single asterisk (*) means manual transaxle and a double asterisk (**) means automatic transaxle, indicating which connector applies to each transmission type.

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1994 Ford Probe PCM Wiring Diagram - CKP & ECT Sensor, TCM Circuits (Page 5)

Ford wiring diagram for crankshaft position and engine coolant temperature sensors and PCM

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Ford wiring diagram showing the crankshaft position sensor, engine coolant temperature sensor and PCM with color-coded wires and connectors.

AI caption July 2012 · Photo 417 of 676

This document is one page of a multi-page Powertrain Control Module (PCM) wiring diagram for a Ford Probe. It shows circuits connecting the PCM to the Air Conditioner/Heater (page 54-4), Daytime Running Lamps (page 97-3), and the Instrument Cluster (page 60-3) including the speedometer and Malfunction Indicator Lamp (MIL/Check Engine). For automatic transaxle vehicles, circuit 369 GN/R and 746 BL link the PCM to the Transaxle Control Module (TCM, page 29-6) through connectors C241, C240, C249, C259, S296, and C248. The lower half details the Crankshaft Position (CKP) Sensor wiring — circuits 727 GN and 728 BL with a shielded circuit 65 BK/R through connectors C246, C151, C126, and C123 — and the Engine Coolant Temperature (ECT) Sensor wiring — circuit 724 R/GN through C247 and C143, grounding via circuit 62 BK/BL through joint connector C106 to ground G106 (grounds referenced on pages 10-8 and 10-10). Notes explain the CKP sensor identifies crankshaft position for engine speed and fuel delivery control, while the ECT sensor's reading is used by the PCM for coolant fan and A/C operation. Legend marks distinguish manual (*) versus automatic (**) transaxle connector usage. Wire colors include GN, BL, BK/R, R/GN, GN/BK, BL/O, GN/R, and BK/BL.

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Frequently asked questions

What circuits connect the PCM to the Crankshaft Position (CKP) sensor?: Circuits 727 GN and 728 BL, with a shielded ground circuit 65 BK/R, routed through connectors C246, C151/C126, and C123 to the CKP sensor.
How is the Engine Coolant Temperature (ECT) sensor wired to the PCM?: Circuit 724 R/GN runs from the PCM through connector C247 to the ECT sensor at C143, and the sensor grounds via circuit 62 BK/BL through joint connector C106 to ground G106.
What does the PCM use the ECT sensor signal for according to this diagram?: The note states the ECT sensor measures engine coolant temperature and is used by the PCM to determine coolant fan and A/C operation.
Which circuits connect the PCM to the Transaxle Control Module (TCM)?: On automatic transaxle vehicles only, circuit 369 GN/R and circuit 746 BL connect through connectors C241, C240, C249, C259, S296, and C248 to the TCM (page 29-6).
What do the asterisk marks on connectors C151 and C126 mean?: A single asterisk (*) means manual transaxle and a double asterisk (**) means automatic transaxle, indicating which connector applies to each transmission type.