Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 42 (ENGINE CONTROLS - TESTS W/CODES - EEC-V (4.6L))SERVICE CODE-TO-TEST REFERENCE MENUSDIAGNOSTIC TROUBLE CODE (DTC) REF CHART (CODES P1150-P1787)
1991 Mercury Tracer Base, 4D Sedan, Automatic
Diagnostic Trouble Code (DTC) Ref Chart (Codes P1150-P1787)
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Diagnostic Trouble Code (DTC) Ref Chart (Codes P1150-P1787)
WARNING: This page is about a different car, the 1994 Mercury Cougar and 1994 Ford Thunderbird. However, it is still accessible from the selected car via links, so may be relevant.
DTC REFERENCE
| 3-Digit Code | Description | Go To KOEO | Go To KOER | Go To CONT. | ||
|---|---|---|---|---|---|---|
| P1150 | Fuel Control | -- | -- | H40 | ||
| P1151 | Fuel Control | -- | H40 | H40 | ||
| P1152 | Fuel Control | -- | H40 | H40 | ||
| P1157 | Fuel Control | -- | H80 | -- | ||
| P1158 | Fuel Control | -- | H80 | -- | ||
| P1351 | Ignition Diagnostic Monitor (IDM) | -- | -- | NA2 | ||
| P1352 | Ignition Coil Failure | -- | -- | JC30 | ||
| P1353 | Ignition Coil Failure | -- | -- | JC30 | ||
| P1354 | Ignition Coil Failure | -- | -- | JC30 | ||
| P1355 | Ignition Coil Failure | -- | -- | JC30 | ||
| P1364 | Ignition Coil Failure | -- | -- | JC30 | ||
| P1390 | Octane Adjust | FG1 | -- | -- | ||
| P1400 | EGR System | HE1 | HE1 | HE1 | ||
| P1401 | EGR System | HE10 | HE10 | HE10 | ||
| P1403 | EGR System | -- | -- | HE40 | ||
| P1405 | EGR System | -- | -- | HE50 | ||
| P1406 | EGR System | -- | -- | HE60 | ||
| P1407 | EGR System | -- | -- | HE70 | ||
| P1408 | EGR System | -- | HE71 | -- | ||
| P1460 | Constant Control Relay Module (CCRM) | X105 | X105 | X120 | ||
| P1473 | Constant Control Relay Module (CCRM) | X30 | X30 | X30 | ||
| P1474 | Constant Control Relay Module (CCRM) | X20 | X20 | X20 | ||
| P1479 | Constant Control Relay Module (CCRM) | X15 | X15 | X65 | ||
| P1480 | Constant Control Relay Module (CCRM) | X45 | X45 | X75 | ||
| P1481 | Constant Control Relay Module (CCRM) | X50 | X50 | X50 | ||
| P1500 | Vehicle Speed Sensor (VSS) | -- | -- | DP10 | ||
| P1505 | Idle Air Control (IAC) Valve | -- | KE15 | KE15 | ||
| P1605 | Diagnostic Trouble Code P1605 | QB1 | -- | -- | ||
| P1650 | Power Steering Pressure (PSP) Switch | FF1 | -- | -- | ||
| P1651 | Power Steering Pressure (PSP) Switch | -- | FF4 | FF4 | ||
| P1703 | Brake On-Off (BOO) Switch | FD2 | -- | -- | ||
| P1705 | Manual Lever Position (MLP) Sensor | TD1 | -- | -- | ||
| P1706 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P1711 | Transmission Fluid Temperature (TFT) Sensor | TE20 | TE20 | -- | ||
| P1731 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P1732 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P1733 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P1734 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P1741 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P1742 | Transmission Fault | -- | -- | (1) | ||
| P1743 | Transmission Fault | -- | -- | (1) | ||
| P1744 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P1746 | Transmission Fault | TC 1 | -- | TG 90 | ||
| P1747 | Transmission Fault | TC 1 | -- | TG 90 | ||
| P1780 | TCS/TCIL | -- | TB1 | -- | ||
| P1783 | Transmission Fluid Temperature (TFT) Sensor | -- | -- | TE110 | ||
| P1784 | -- | -- | -- | (1) | ||
| P1785 | -- | -- | -- | (1) | ||
| P1786 | Elect Transmission Continuous Memory DTC | -- | -- | TG90 | ||
| P1787 | Transmission Fault | TC 1 | -- | TG 90 | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.