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Ford Crown Victoria PCM Wiring Diagram - HO2S, IAT, CMP, Octane Plug (Gasoline)
Reference · 1992-1997 Crown VictoriaAll 12 wiring diagrams
Wiring diagram showing heated oxygen sensors, instrument cluster, intake air temperature and camshaft position sensor circuits.
Part of 1992-1997 Ford Crown Victoria Wiring Diagrams
This is one page of a Ford factory-style wiring diagram (EVTM format) labeled "GASOLINE," covering portions of the engine control / powertrain management circuits. It shows the Powertrain Control Module (PCM, solid state) and its connections to the left and right heated oxygen sensors #2 (HO2S, connectors C1039M/C1039F and C1040M/C1040F), the Intake Air Temperature (IAT) sensor at C157, the Octane Adjust Plug at C1013, the Camshaft Position (CMP) sensor and its shield (C178, C185), the Output Shaft Speed (OSS) sensor at C112, and the Transmission Range (TR) sensor at C168 for the 4R70W transmission. It also shows instrument cluster circuits for the Malfunction Indicator Lamp (MIL/Check Engine) and fuel flow rate input for both digital and analog clusters, fed from a "HOT IN START OR RUN" source. Circuit numbers and wire colors are given throughout (e.g., 361 R, 393 P/LG, 392 R/LG, 389 W/R, 390 T/V, 359 GY/R, 199 LB/Y, 743 GY, 240 LB/V, 205 DB/LG, 658 PK/LG, 795/796 LB, 48/57 BK), along with splices S147, S125, S104, S148 and grounds S101/G101. Explanatory callouts describe the HO2S voltage function, IAT thermistor operation, and CMP sensor role in sequential injector pulsing. Cross-references point to pages 23-2, 23-3, 23-5, 29-3, 10-1, 60-3, and 63-3.
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Frequently asked questions
- What wire color is circuit 359 in this diagram?
- Circuit 359 is GY/R (gray/red) and runs from PCM pin 91 through splice S125 to the HO2S sensors, IAT sensor, OSS sensor, TR sensor, and out to C102 (page 23-3) and C127 (page 23-5).
- What connectors are used for the heated oxygen sensors?
- The Left Heated Oxygen Sensor #2 (HO2S) uses connectors C1039M/C1039F and the Right Heated Oxygen Sensor #2 uses C1040M/C1040F.
- What does the Camshaft Position (CMP) sensor do according to this diagram?
- The callout states it supplies camshaft position information to the PCM, which uses it during engine startup to begin sequential pulsing of the injectors. It connects via C178 with circuits 795 LB and 796 LB, with a shield grounded through 48 BK.
- How does the Intake Air Temperature (IAT) sensor work per this diagram?
- It is described as a thermistor whose resistance decreases as intake air temperature increases; the PCM uses the voltage drop to calculate fuel delivery, spark timing and EGR control. It connects at C157 with circuit 743 GY to PCM pin 33 and 359 GY/R return.
- Which transmission is shown and where is its detail found?
- The 4R70W transmission is shown at connector C111, with the Transmission Range (TR) sensor and Output Shaft Speed (OSS) sensor detailed on page 29-3.
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