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.
2004 Mercury MontereyFACTORY OEM SERVICE PROCEDURE
Speed Control DTCS
SPEED CONTROL ACTUATOR DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTCs | Description | Source | Perform Test |
|---|---|---|---|
| B1318 | Low Ignition Voltage During Speed Control Operation | Speed control actuator | Go To PINPOINT TEST L: DTC B1318 - LOW IGNITION VOLTAGE DURING SPEED CONTROL OPERATION . |
| B1342 | ECU is Defective | Speed control actuator | CLEAR the DTCs. REPEAT the self-test. If DTC B1342 is retrieved again, INSTALL a new speed control actuator. Refer to SPEED CONTROL ACTUATOR . CLEAR the DTCs. REPEAT the self-test. |
| C1109 | Throttle Did Not Return to Idle After Self Test | Speed control actuator | Go To PINPOINT TEST K: DTC C1179 - EXCESSIVE CABLE SLACK IN SPEED CONTROL CABLE, DTC C1109 - THROTTLE DID NOT RETURN TO IDLE AFTER SELF-TEST . |
| C1126 | Command Switch Stuck for 2 Minutes or Longer | Speed control actuator | Go To PINPOINT TEST H: DTC C1126 - COMMAND SWITCH STUCK FOR 2 MINUTES OR LONGER . |
| C1127 | Deactivator Switch Stuck Open | Speed control actuator | If the vehicle is equipped with stability assist, Go To PINPOINT TEST I: DTC C1127 - DEACTIVATOR SWITCH STUCK OPEN (VEHICLES WITH STABILITY ASSIST) . If the vehicle is not equipped with stability assist, Go To PINPOINT TEST J: DTC C1127 - DEACTIVATOR SWITCH STUCK OPEN . |
| C1179 | Excessive Cable Slack in Speed Control Cable | Speed control actuator | Go To PINPOINT TEST K: DTC C1179 - EXCESSIVE CABLE SLACK IN SPEED CONTROL CABLE, DTC C1109 - THROTTLE DID NOT RETURN TO IDLE AFTER SELF-TEST . |
| U1027 | Missing or Invalid Throttle Message | Speed control actuator | Go To PINPOINT TEST M: DTCS U1027, U1041, U1051 AND U1059 . |
| U1041 | Missing or Invalid Vehicle Speed Message | Speed control actuator | Go To PINPOINT TEST M: DTCS U1027, U1041, U1051 AND U1059 . |
| U1051 | Missing or Invalid Brake Message | Speed control actuator | Go To PINPOINT TEST M: DTCS U1027, U1041, U1051 AND U1059 . |
| U1059 | Missing or Invalid PRNDL Message | Speed control actuator | Go To PINPOINT TEST M: DTCS U1027, U1041, U1051 AND U1059 . |
Factory Service Tools
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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.
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