Pinpoint Test B: Pinpoint Test B: DTC P0532, B1318 And/Or B1676

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Make sure battery voltage is greater than 12.2 volts prior to and during this pinpoint test.

NOTE: Do not have a battery charger attached during vehicle testing.

B1 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 BATTERY, MOUNTING AND CABLES .
- Does the battery pass the condition test?
- Yes : GO to B2.
- No : INSTALL a new battery. REFER to BATTERY, MOUNTING AND CABLES . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
B2 CHECK THE VOLTAGE DROP IN THE VEHICLE GROUNDS
- Start the engine.
- With the engine running at idle, headlamps on and heater blower set to high, measure the voltage drop between the generator housing and the negative battery terminal.
  
  Fig 1: Measuring Voltage Drop Between Generator Housing And Negative Battery Terminal
  Courtesy of FORD MOTOR CO.
- Is the voltage drop less than 0.25 volt (250 mV)?
- Yes : GO to B3.
- No : INSPECT for and REPAIR any corrosion or looseness in the engine ground, generator ground or the battery ground. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
B3 CHECK THE VOLTAGE DROP IN THE GENERATOR B+ CIRCUIT
- With the engine running at idle, headlamps on and blower set to high measure the voltage drop:
  - For 3.7L, between generator B+ C102B, circuit SBF01 (RD) and the positive battery terminal.
  - For 5.0L and 5.8L, between generator B+ C102C, circuit SBF01 (RD) and the positive battery terminal.
    
    Fig 2: Checking Voltage Drop In Generator B+ Circuit
    Courtesy of FORD MOTOR CO.
- Is the voltage drop less than 0.5 volt?
- Yes : GO to B4.
- No : VERIFY the High Current Battery Junction Box (BJB) 200A fuse is OK. If OK, INSPECT for and REPAIR any corrosion or looseness in circuit SBF01 (RD), High-Current Battery Junction Box (BJB) C1617A, generator B+ C102B or C102C and positive battery cable connections. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. If fuse is not OK, INSPECT and REPAIR the cause of the circuit short before replacing the High Current Battery Junction Box (BJB).
B4 CHECK FOR CURRENT DRAINS
- Carry out the Battery - Drain Testing. Refer to BATTERY, MOUNTING AND CABLES .
- Are any circuits causing excessive current drains?
- Yes : REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
- No : For 3.7L manual transmission , CARRY OUT the GENERATOR CLUTCH . If the generator clutch tests OK, CHECK with the customer to determine if any electrical system(s) may have been accidently left on. If nothing unusual is found, CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. GO to PINPOINT TEST D to continue diagnosis of the charging system.
  For all others , no problems found at this time. CHECK with the customer to determine if any electrical system(s) may have been accidently left on. If nothing unusual is found, CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation. GO to PINPOINT TEST D to continue diagnosis of the charging system.