P0817
Starter circuit
Starter circuit error
TCM detected a failure in the starter circuit, failed ON or OFF
No TCC engagements, no adaptive or self learning strategy.
Go to Section 303-06 .
Starting System
The starting system consists of the following components:
When the key is placed in the START position, the starter solenoid is energized and a magnetic field is created in the starter solenoid windings. The iron plunger core is drawn into the starter solenoid coil, and a drive lever and pin connected to the starter drive engages the drive pinion gear to the flexplate/flywheel ring gear. When the plunger is pulled all the way in, its contact disc closes the circuit between the battery and the starter motor solenoid feed terminals. This sends current to the motor, and the drive pinion gear cranks the flexplate/flywheel to start the engine. When current flows to the starter motor, the starter solenoid pull-in coil is bypassed, and the hold-in coil keeps the drive pinion gear engaged with the flywheel until the ignition switch is released from the START position.
An overrunning clutch in the starter drive protects the starter motor from excessive speeds during the brief period before the driver releases the ignition switch from the START position as the engine starts.
Vehicles equipped with a manual transaxle have a clutch cutoff switch mounted on the clutch pedal bracket. The clutch cutoff switch prevents operation of the starter motor unless the clutch is fully depressed.
Vehicles equipped with an automatic transmission have a TR sensor mounted on the transaxle. The TR sensor prevents operation of the starter motor unless NEUTRAL or PARK is selected.
Principles of Operation
Anti-Theft Intervention
The starting system is electronically controlled by the passive anti-theft system (PATS). The PATS system recognizes the correct electronically coded ignition key and signals the instrument cluster to provide a ground for the starter relay. The energized relay provides voltage to the starter solenoid, thereby allowing the starter motor to activate
NOTE: When working on the starter system, make sure the anti-theft system is operating correctly.
Visual Inspection Chart
Mechanical
Electrical
Testimonial: "Good info and very helpful but the ford dealer said it was the tcm and the cost of repair was over $1800, if I or my mechanic could replace with a used one could you tell me where it is located on the car?"
Where is the TCM located on my car?
Sure ,no problem . It's part of the PCM - engine control module , Mounted on the fire wall driver side - below the master cylinder
You can't just replace it with a used one an expect it to work , needs to be programmed an have PATS - anti-theft system keys programmed in .
Thanks Jeff, a repair company told me they can flash program the TMC with my VIN# and through my research that's all you have to do, or I'm I wrong?
Still has to have PATS keys programmed an needs to be reconfigured . Dealer . I had to do this before , got a re built PCM from a place in Pa . The ford fusion still had to take a tow truck ride to the ford dealer .
Oh okay thanks for the great information Jeff!!
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SOURCE: code P0128 ford, fusion 2006 4 cly
I had the same code. It means your engine coolant temp. is too low. That means your thermostat needs to be changed. Get the Ford Motorcraft one. It comes with the entire housing. Have a mechanic replace it. It is a real bugger to get to.
SOURCE: 2006 Ford Fusion a/c not working
its inside the hvac box under the dash you may or may not have to romove the hvac unit to change it. circuit high means an open circuit so check connectors and such
SOURCE: 2006 Ford Fusion SEL - TPS
The TPS is an easy part to replace. It has 2 screws and 1 electric connector. It is about the size of a butane lighter and attaches to the metal airhorn.
There is only a slight adjustment possible for this part. One end has an elongnated slot for the screw. Just look at where the old part was adjusted and replace it that way. The only thing you need to watch is aligning the slot on the throttle shaft with the indentation on the TPS.
While you are replacing the part, disconnect the battery on the POS cable and this will reset the "check engine" light on the dash. Then reconnect and drive your car.
SOURCE: 2006 Repair Manual Ford Fusion 1.4
autozone.com sign up its free then click on repair manuals you will find all of your info there....good luck
SOURCE: p0128 code on 2006 ford
Your vehicle needs a thermostat. It is a pretty simple repair. Its under the left side of the intake manifold. You have to get one of the bolts from the bottom and the other two from the top.
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