• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
The starter/generator control module (SGCM) monitors auxiliary power module (APM) On/Off, DC - DC direction is commanded On but converter is Off to check the status of the 14 volt power module. The SGCM also monitors to detect the APM on when it is not commanded On causing a large current output. If a fault is detected, the appropriate DTC will set.
The engine is running.
In normal charge mode, 12 volt output voltage - 12-volt command voltage is greater than 0.2-volt for 1 second.
DC-DC direction is Off, but converter remains On and APM current is greater than +/-20 amps for 1 second.
• | Stop PWM (MGU shutdown) |
• | APM PWM off |
• | Battery disconnection (disconnect SW on/off) |
Clears 30 seconds after cycle wakeup signal.
• | Electrical failure in SGCM, open circuit or open fuse |
• | FET breakdown |
FET breakdown
Hybrid Controls Connector End Views
Caution: To help avoid personal injury, additional precautions must be taken prior to working on the generator control module or the generator starter. After removing the 36V battery cables from the generator battery, remove both engine wiring harness connectors from the generator control module. Wait at least 5 minutes and then remove the generator control module cover. Verify voltage levels at all 36V, 12V, and 3-phase connections, are less than 3 volts using a DMM before proceeding.
Caution: To help avoid personal injury, be careful when working in the vicinity of the generator battery disconnect control module. Internal components will still be live, 36V potential, even when the cover has been opened or removed.
⇒ | If less than specified value, test the supply voltage circuit for a short to ground or an open/high restance. |
⇒ | If not within the specified range, replace the maxi fuse. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for SGCM replacement, setup, and programming