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 MANUALSMERCURY2010MARINER HYBRID, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 577 (CRUISE CONTROL SYSTEM)DIAGNOSIS AND TESTINGSPEED CONTROLINSPECTION AND VERIFICATION
2010 Mercury Mariner Hybrid, AWD
Inspection and Verification
2010 Mercury Mariner Hybrid, AWDSECTION Inspection and Verification
WARNING: This page is about a different car, the 2006 Mercury Montego, 2006 Ford Freestyle, and 2006 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the customer concern.
- Visually inspect for obvious signs of mechanical or electrical damage.VISUAL INSPECTION TABLE
Mechanical Electrical - Throttle body
- Smart junction box (SJB) fuse 18 (10A)
- Circuitry
- Speed control deactivator switch
- Speed control switch
- Powertrain control module (PCM)
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- Verify the stoplamps operate correctly by pressing the brake pedal. If the stoplamps do not operate correctly, refer to PINPOINT TEST I: THE STOPLAMPS ARE INOPERATIVE .
- Verify the parking brake warning indicator operates correctly. If the parking brake warning indicator does not operate correctly, refer to PINPOINT TEST I: THE BRAKE WARNING INDICATOR IS NEVER/ALWAYS ON .
- If the cause is not visually evident, connect the diagnostic tool to the data link connector (DLC) and select the vehicle to be tested from the diagnostic tool menu. If the diagnostic tool does not communicate with the vehicle:
- check that the program card is correctly installed.
- check the connections to the vehicle.
- check the ignition switch position.
- If the diagnostic tool still does not communicate with the vehicle, refer to the diagnostic tool operating manual.
- Carry out the diagnostic tool data link test. If the diagnostic tool responds with:
- CAN circuits fault; all electronic control units no response/not equipped, refer to PINPOINT TEST M: NO HIGH SPEED CONTROLLER AREA NETWORK (CAN) COMMUNICATION and PINPOINT TEST N: NO MEDIUM SPEED CONTROLLER AREA NETWORK (CAN) COMMUNICATION .
- No response/not equipped for PCM, refer to PINPOINT TEST F: THE POWERTRAIN CONTROL MODULE (PCM) DOES NOT RESPOND TO THE DIAGNOSTIC TOOL .
- System passed, retrieve and record the continuous diagnostic trouble codes (DTCs), erase the continuous DTCs, and carry out the self test diagnostics for the PCM.
- If the DTCs retrieved are related to the concern, go to the POWERTRAIN CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX table.
- If no DTCs related to the concern are retrieved, GO to SYMPTOM TABLE .
POWERTRAIN CONTROL MODULE (PCM) DIAGNOSTIC TROUBLE CODE (DTC) INDEX
| DTC | Description | Source | Action |
|---|---|---|---|
| P0579 | Cruise Control Multifunction Input A Circuit Range/Performance | PCM | GO to PINPOINT TEST C . |
| P0581 | Cruise Control Multifunction Circuit High | PCM | GO to PINPOINT TEST C . |
| P0720 | Output Shaft Speed Circuit Fault | PCM | REFER to PINPOINT TEST F: OUTPUT SHAFT SPEED (OSS) SENSORS or PINPOINT TEST C: OUTPUT SHAFT SPEED (OSS) SENSORS . |
| P0721 | Output Shaft Speed Circuit Fault | PCM | REFER to PINPOINT TEST F: OUTPUT SHAFT SPEED (OSS) SENSORS or PINPOINT TEST C: OUTPUT SHAFT SPEED (OSS) SENSORS . |
| P1500 | Vehicle Speed Error | PCM | REFER to DIAGNOSIS AND TESTING or DIAGNOSIS AND TESTING . |
| P1501 | Vehicle Speed Error | PCM | REFER to DIAGNOSIS AND TESTING or DIAGNOSIS AND TESTING . |
| P1572 | Brake On/Off Failure | PCM | GO to PINPOINT TEST B . |
| P1703 | Brake On/Off Failure | PCM | GO to PINPOINT TEST B . |
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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.