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Stop Start

Stop Start Overview 

The 2013 MY Fusion will incorporate Stop Start. Stop-Start will automatically turn off the engine when the vehicle is stopped, such as at traffic lights, to avoid fuel waste due to unnecessary engine idle. Upon brake pedal release, the engine will automatically restart offering normal vehicle response. The vehicle may not turn off the engine when stopped depending on customer comfort settings or vehicle conditions.

The benefits are improved fuel economy and reduced exhaust emissions. Stop Start affects many components and subsystems in the vehicle as shown in the diagram below.

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Stop Start Diagnostics 

Existing diagnostics for the thermostat monitor had to be revised to accommodate stop-start. The ECT model used for the thermostat had to be revised to accommodate engine pull downs.

Diagnostics were added for new/improved hardware:

Stop Start Enable Conditions: 

Stop Start is enabled during a normal driving cycle based on the entry conditions listed in the table below:

Input  Stop-Start Inhibit Conditions  Rationale 
ECT 140 deg F < ECT > 230 deg F Combustion Stability
BARO BARO <= 20 in Hg (Altitude <= 10, 000 ft) Minimum Air Charge
FRP at Idle Fuel Rail Pressure (FRP) at Idle >= 45 Bar Restart Combustion Stability
FRP w/Engine Off FRP at engine off >= FRP at Idle with max drop of 5 Bar. If FRP at eng off drops below threshold, request pull-up Restart Combustion Stability
Time Since Key-Start 10 seconds Oil Stabilization and Learn Closed Throttle
Max Crank Time Max Crank Time should be min of 5 sec below limit to allow a shutdown To avoid a possible max crank fault
Low Fuel Level fuel level below 15% Avoid starts on empty fuel tank
Purge complete Canister Purge Valve no closed before end of pre stop period Wait for purge to complete before pulling down engine
Adaptive Fuel Complete Adaptive fuel learning not complete If Adaptive fuel learning is in process, wait for it to complete before pull down

Stop Start Disable Conditions: 

Stop-Start is inhibited if any of the following DTCs are set. This is intended to ensure that starting is not compromised.

  1. FVR  (P0001, P0003, P0004), Low Pressure Fuel  (P008A, P008B), Crank Fuel Pressure  (P00C6),
  2. VVT  (P0010, P0011, P0012, P0013, P0014, P0015, P0016, P0017),
  3. AAT  (P0072, P0073, P0074), IAT  (P00CE), High Pressure Fuel  (P0087, P0088),
  4. IAT2  (P0096, P0097, P0098), MAF  (P0100, P0102, P0103, P1101), MAF/TP (P0068),
  5. MAP  (P0106, P0107, P0108, P0109), IAT1  (P0111, P0112, P0113, P0114),
  6. ECT  (P0116, P0117, P0118, P0119), TP1  (P0122, P0123), TP2 (P0222, P0223),
  7. Fuel Monitor  (P0148, P0171, P0172), LP FP  (P018C, P018D), FRP  (P0192, P0193),
  8. Injectors  (P0201, P0202, P0203, P0204), Misfire  (P0300, P0301, P0302, P0303, P0304),
  9. Fuel Pump  (P025A, P025B, P0230, P0231, P0232, P0627, P064A),
  10. CMP A  (P0340, P0341, P0344), Coils  (P0351, P0352, P0353, P0354),
  11. CMP B  (P0365, P0366, P0369), Idle Speed  (P0505, P0506, P0507), Starter  (P0615, P06E9, P162F),
  12. ETC  (P2100, P2101, P2107, P2111, P2112), APP  (P2122, P2123, P2127, P2128, P2135, P2138),
  13. BARO  (P2227, P2228, P2229, P2230), PCV  (P2282),
  14. Coils  (P2300, P2301, P2303, P2304, P2306, P2307, P2309, P2310)

Stop Start Customer Interface 

The 2013 MY Fusion will incorporate Stop Start. Start/stop is enabled for every start as the default condition. It cannot be permanently disabled.

Auto Start/stop can be disabled (and re-enabled) by pressing the button on the console, which lights up with the word OFF next to the auto start/stop symbol. This is very similar to how other features, like traction control or backup warning works.

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If you have the message center displaying the auto start/stop feature messages, it will tell you when you come to a stop that auto start/stop is disabled by the driver.

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Stop Start Button 

The stop-start disable button is a momentary contact switch. It is normally open, CAN signal low. Closed (button being pushed) is CAN signal high. The Front Controls Interface Module reads the switch status and sends it over CAN to the PCM.

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The PCM looks for a low to high transition to toggle the status of Stop-start from enabled (default state) to disabled. If there is another low to high transition, stop-start will go from disabled to enabled.

If the PCM stops receiving data from the FCIM, the PCM sets a U0256 - Lost Communication with Front Controls Interface Module "A".

If the FCIM detects that the switch is shorted to ground, it sets a B12CB -11 Start/Stop "Eco-Start" Enable Button Circuit Short To Ground. DTC sets if the button is pushed for 4 continuous seconds (8 samples) but will clear it if the fault is not detected any time after that for 500 msec

If the FCIM detects that the status indicator is shorted to ground, it sets a B12CA-11 - Start/Stop "Eco-Start" Status Indicator Circuit Short To Ground

If the FCIM detects that the status indicator is shorted to battery or open, it sets a B12CA-15 -Start/Stop "Eco-Start" Status Indicator Circuit Short To Battery or Open

If the button is stuck open, there are no low to high transitions. Since the PCM does not recognize a button push, stop-start will not be disabled if requested by the customer. All stop-start HMI will continue indicating that stop-start is enabled (e.g. Tell-Tale and IOD).

If the button is stuck closed, there are no low to high transitions. Since the PCM does not recognize a button push, stop-start will not be disabled if requested by the customer. All stop-start HMI will indicate that stop/start is enabled (e.g. Tell-Tale and IOD).

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