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Charging System - General Information: Other Ford Freestyle I

Charging System 3 illustrations ~650 words

Battery

The battery is a 12-volt DC source connected in a negative ground system. The battery case is sealed with 2 vent holes to release gases. The battery has 3 major functions

  1. Engine cranking power source
  2. Voltage stabilizer for the electrical system
  3. Temporary power source when electrical loads exceed the generator output current

SPECIAL TOOLS REFERENCE 73111 Automotive Meter 105-R0057 or equivalent SABRE Premium Battery and Electrical System Tester 010-00736 or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware, or equivalent scan tool Flex Probe Kit 105-R025B

Scheme 16

Scheme 16: Charging System
Scheme 16: Charging System

Positive Battery Output (B+) Terminal Circuit 38 (BK/OG)

The generator output voltage is supplied through the B+ terminal circuit 38 (BK/OG) on the rear of the generator to the battery and electrical system.

Circuit 1818 (WH/BK)

This is the A terminal battery voltage sense circuit and is used to sense battery voltage.

Circuit 1817 (YE)

The GEN MON circuit communicates the generator load and error conditions to the PCM.

Circuit 1816 (YE/LB)

This is the GEN COM circuit. The PCM determines the optimal voltage set point for the charging system and communicates this information to the voltage regulator via the GEN COM circuit.

Pinpoint Tests

CAUTIONElectronic modules are sensitive to electrostatic discharge. If exposed to these charges, damage can result.

Refer to INSPECTION AND VERIFICATION , the Diagnostic Trouble Code (DTC) Index and the SYMPTOM TABLE for direction to the appropriate Pinpoint Test.

Possible Causes

  1. High key-off current drain(s)
  2. Engine, generator and battery grounds
  3. Positive battery cable
  4. Circuit 38 (BK/OG) high resistance
  5. Battery
  6. Generator

Scheme 17

Scheme 17: PINPOINT TEST A: THE BATTERY IS DISCHARGED OR BATTERY VOLTAGE IS LOW
Scheme 17: PINPOINT TEST A: THE BATTERY IS DISCHARGED OR BATTERY VOLTAGE IS LOW

Scheme 18

Scheme 18
Scheme 18
  1. A1 CHECK THE BATTERY CONDITION Carry out the Battery - Condition Test to determine if the battery can hold a charge and is OK for use. Refer to «PINPOINT TEST A: BATTERY CONDITION TEST»(ref-255287-S33293989942007053000000) . Does the battery pass the condition test? Yes: GO to A2 . No: INSTALL a new battery. REFER to «REMOVAL AND INSTALLATION»(ref-255287-S13378076882007053000000) . TEST the system for normal operation.
  2. A2 CHECK THE GENERATOR OUTPUT Carry out the Generator On-Vehicle Load Test and No Load Test. Refer to the «COMPONENT TESTS»(ref-255277-S21207482462007053000000) . Does the generator pass the component tests? Yes: GO to A3 . No: INSTALL a new generator. REFER to «REMOVAL AND INSTALLATION»(ref-255256-S16688497582007053000000) . TEST the system for normal operation.
  3. A3 CHECK FOR CURRENT DRAINS Carry out the Battery - Drain Testing. Refer to the «COMPONENT TESTS»(ref-255277-S21207482462007053000000) . Are any circuits causing excessive current drains? Yes: REPAIR as necessary. TEST the system for normal operation. No: GO to A4 .
  4. A4 CHECK THE VEHICLE GROUNDS Key in START position. With the engine running, measure the voltage drop between the generator housing and the negative battery terminal. Is the voltage drop less than 0.1 volt? Yes: GO to A5 . No: CHECK the engine ground, generator ground and the battery ground for corrosion. TEST the system for normal operation.
  5. A5 CHECK THE VOLTAGE DROP IN THE B+ CIRCUIT SDC14 (RD) With the engine running, measure the voltage drop between generator B+102c, circuit SDC14 (RD) and the positive battery terminal. Is the voltage drop less than 0.1 volt? Yes: CHECK if the customer left any electrical system(s) on or if there is an intermittent excessive battery draw. TEST the system for normal operation. No: CHECK for any corrosion in the B+ SDC14 (RD), positive battery cable and/or connections. REPAIR as necessary. TEST the system for normal operation.
  1. Generator
  2. Instrument cluster
  3. Powertrain control module (PCM)
  1. Generator
  2. Instrument cluster
  3. PCM
  1. Accessory drive belt
  2. Loose bolts/brackets
  3. Generator/pulley
  1. Generator
  2. Circuitry
  3. In-vehicle entertainment system

Generator On-Vehicle Tests

CAUTIONTo prevent damage to the generator, do not make the jumper wire connections except as directed. Do not allow any metal object to come in contact with the housing and the internal diode cooling fins with the key in the ON or OFF positions. A short circuit may result and burn out the diodes.

Note. Battery posts and cable clamps must be clean and tight for accurate meter indications. Refer to the battery tester manual for complete directions for testing the charging system.

  1. Turn off all of the lamps and the electrical components.
  2. Place the transmission in NEUTRAL and apply the parking brake.
  3. Carry out «GENERATOR ON-VEHICLE TESTS - LOAD TEST»(ref-255277-S11650159212007053000000) and «GENERATOR ON-VEHICLE TESTS - NO LOAD TEST»(ref-255277-S32400097162007053000000) according to the following component tests

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