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 1233 (AUTOMATIC TRANSAXLE EXTERNAL CONTROLS AISIN AW21/6F35 (EXCEPT HYBRID))DIAGNOSIS AND TESTINGEXTERNAL CONTROLSSYMPTOM TABLE - EXTERNAL CONTROLS

2010 Mercury Mariner Hybrid, AWD

Symptom Table - External Controls

2010 Mercury Mariner Hybrid, AWDSECTION Symptom Table - External Controls

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

SYMPTOM TABLE - EXTERNAL CONTROLS

Condition	Possible Sources	Action
Brake shift interlock system does not release/lock correctly	Circuitry open/shorted Smart Junction Box (SJB) fuse 5 (10A) Brake Pedal Position (BPP) switch SJB	Go to PINPOINT TEST A .
	Brake Shift Interlock Actuator (BSIA)	INSTALL a new selector lever assembly. REFER to Installation (Fusion/Milan) or Installation (MKZ).
	Transmission Range (TR) sensor	DIAGNOSE and REPAIR all TR sensor DTCs. REFER to DIAGNOSTIC TROUBLE CODE (DTC) TABLES .
Transmission Control Switch (TCS) does not operate correctly (vehicles equipped with a 2.5L engine only)	Instrument Cluster (IC) Circuitry open/shorted Transmission Control Module (TCM) TCS	Go to PINPOINT TEST B .
Select shift does not operate/Overdrive (O/D) does not cancel (vehicles equipped with a 3.0L engine and a 3.5L engine)	Selector lever not fully engaging in M position Selector lever damaged Circuitry open/shorted PCM Select shift switch	INSPECT the selector lever for damage and replace as necessary. Go to PINPOINT TEST C for vehicles equipped with a 3.0L engine or go to PINPOINT TEST D for vehicles equipped with a 3.5L engine.
Selector lever linkage is out of correct gear relationship	Selector lever linkage out of adjustment	REFER to SELECTOR LEVER CABLE ADJUSTMENT - AISIN AW21 or SELECTOR LEVER CABLE ADJUSTMENT - 6F35 .
	Loose selector lever cable bracket	CHECK the selector lever cable bracket. TIGHTEN as necessary.
	Loose/out of alignment selector lever bezel	CHECK the selector lever bezel alignment. ALIGN or REPLACE selector lever bezel as necessary.
Selector lever binding	Selector lever bezel damaged Selector lever damaged Selector lever cable damaged Internal transaxle components damaged	CHECK the selector lever bezel for damage. If necessary, INSTALL a new selector lever bezel. REFER to Installation (Fusion/Milan) or Installation (MKZ). CHECK the selector lever for damage. If necessary, INSTALL a new selector lever assembly. REFER to Installation (Fusion/Milan) or Installation (MKZ). CHECK the selector lever cable for damage. If necessary, INSTALL a new selector lever cable. REFER to Installation . CHECK the manual control lever and internal transaxle components for damage. REFER to AUTOMATIC TRANSAXLE/TRANSMISSION - AISIN AW21 or IN-VEHICLE REPAIR .
Brake shift interlock override does not release the selector lever	Brake shift interlock override damaged	INSPECT the selector lever for damage. If necessary, INSTALL a new selector lever. REFER to Installation (Fusion/Milan) or Installation (MKZ).

RENDER: 1.0x

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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.