K1 RETRIEVE ALL CONTINUOUS MEMORY DIAGNOSTIC TROUBLE CODES (CMDTCS) IN ALL MODULES
Are any charging system related Diagnostic Trouble Codes (DTCs) retrieved from the PCM?
Yes | DIAGNOSE the charging system concern. Refer to the appropriate section in Group 414 for the procedure. |
|---|---|
No | GO to K2 |
K2 CHECK BATTERY CONDITION
Ignition OFF. Carry out the Battery Condition Test. REFER to: Battery (414-01 Battery, Mounting and Cables, Diagnosis and Testing).
Did the battery pass the condition test?
Yes | If the battery passed the condition test but required a recharge, DIAGNOSE the charging system concern. Refer to the appropriate section in Group 414 for the procedure. CLEAR all Diagnostic Trouble Codes (DTCs). TEST the system for normal operation. If the battery passed the condition test and did not require a recharge, GO to K3 |
|---|---|
No | INSTALL a new battery. REFER to: Battery (414-01 Battery, Mounting and Cables, Removal and Installation). |
K3 CHECK CHARGING SYSTEM VOLTAGE
NOTE: Do not allow the engine speed to increase above 2,000 rpm while performing this step or the generator may self-excite and result in default charging system output voltage. If engine speed goes above 2,000 rpm, shut the vehicle OFF and restart the engine before performing this step. Start the engine. Measure the voltage of the battery with and without a load on the charging system as follows: Turn off all accessories and run the engine at 1,500 rpm for a minimum of 2 minutes while measuring battery voltage. Turn on headlights and HVAC fan on high and run engine at 1,500 rpm for a minimum of 2 minutes while measuring battery voltage.
Was the battery voltage between 13 and 15.2 volts?
Yes | GO to K4 |
|---|---|
No | DIAGNOSE the charging system concern. Refer to the appropriate section in Group 414 for the procedure. |
K4 CHECK VOLTAGE AT THE SCME (FRONT SEAT CLIMATE CONTROL MODULE)
REFER to: Supplemental Restraint System (SRS) Depowering (501-20B Supplemental Restraint System, General Procedures). Disconnect: Passenger Side Airbag In-line C219. Disconnect: SCME C3265A. Ignition ON. Measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C3265A-E | Ground | |
C3265A-F | Ground |
Are the voltages greater than 11 volts?
Yes | GO to K5 |
|---|---|
No | REPAIR the circuit in question. GO to K7 |
K5 CHECK SCME (FRONT SEAT CLIMATE CONTROL MODULE) GROUND CIRCUIT FOR AN OPEN
Ignition OFF. Measure:
Click to display connectors
Positive Lead | Measurement / Action | Negative Lead |
|---|---|---|
C3265A-M | Ground |
Repeat this measurement while wiggling the harness.
Is the resistance less than 3 ohms?
Yes | GO to K6 |
|---|
2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.