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 DIAGNOSISTRANSMISSIONAUTOMATIC TRANSDIAGNOSIS - 4EAT (1.9L)SELF-DIAGNOSTIC SYSTEMCODE REFERENCE CHART
1991 Mercury Tracer Base, 4D Sedan, Automatic
Code Reference Chart
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Code Reference Chart
NOTE:
In addition to transmission fault codes, engine-related fault codes may be output during TESTING - QUICK TEST
procedure. These fault codes pertain to engine performance and must be repaired first as engine performance will greatly affect transmission operation. For information and testing procedures of engine-related fault codes and components, see appropriate TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section. Refer to the following list.
- 1991 Models, see: TESTS W/CODES - 1.9L
- 1992 Models, see: TESTS W/CODES - EEC-IV
- 1993 Models, see: TESTS W/CODES - EEC-IV (1.9L)
- 1994 Models, see: TESTS W/CODES - EEC-IV (1.9L)
CODE REFERENCE CHART
| Fault Code | Code Definition | Go To Circuit Test/Step: | |
|---|---|---|---|
| KOEO Codes | |||
| No Code | N/A | QA1 | |
| 111 | Pass Code | N/A | |
| 122 | TPS Malfunction | DH10 | |
| 123 | TPS Malfunction | DH3 | |
| 621 | SS1 Solenoid Circuit Failure | TC20 | |
| 622 | SS2 Solenoid Circuit Failure | TC20 | |
| 641 | SS3 Solenoid Circuit Failure | TC20 | |
| 636 | TOT Out Of Range | TE1 | |
| 637 | TOT Sensor Circuit Open | TE10 | |
| 638 | TOT Sensor Circuit Grounded | TE20 | |
| 998 | FMEM Failure | TC20 | |
| Continuous Memory Codes | |||
| No Code | N/A | QA1 | |
| 111 | Pass Code | N/A | |
| 122 | TPS Malfunction | DH94 | |
| 123 | TPS Malfunction | DH90 | |
| KOEO Codes | |||
| 452 | Insufficient VSS Input | DP1 | |
| 536 | BOO Switch Malfunction | FD90 | |
| 621 | SS1 Solenoid Circuit Failure | TC30 | |
| 622 | SS2 Solenoid Circuit Failure | TC30 | |
| 634 | MLP Sensor Voltage Error | TD10 | |
| 637 | TOT Sensor Voltage High | TE90 | |
| 638 | TOT Sensor Voltage Low | TE90 | |
| 639 | Insufficient Input From TSS | TF95 | |
| 641 | SS3 Solenoid Circuit Failure | TC30 | |
| 643 | SS4 Solenoid Circuit Failure | TC30 | |
| KOER Codes | |||
| No Code | N/A | QA1 | |
| 111 | Pass Code | N/A | |
| 536 | BOO Switch Malfunction | FD1 | |
| 636 | TOT Sensor Voltage Error | TE1 | |
| 639 | Insufficient Input From TSS | TF10 | |
RENDER: 1.0x
NO RELATED
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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.