Circuit/System Verification
- Ignition ON.
- Test for greater than 12 V between the battery positive terminal and negative terminal.
- If 12 V or less
Refer to Battery Inspection/Test .
- If greater than 12 V
- If 12 V or less
- Verify no DTCs are set.
- If any DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- If no DTCs are set
- If any DTCs are set
- Verify Battery Sensor Module Battery State Information parameter reads Available (Learned) and Battery Sensor Module Reset Occurred - Using Estimated State of Charge reads No (Measured).
- If parameters read Not Available (Not Learned) and No (Measured).
- Verify with customer if vehicle may have been jump started or been used to jump start another vehicle, or if the battery has been charged recently.
- If Yes, Disconnect and reconnect the negative battery cable.
- If No
- Connect a DMM to the battery terminals. Verify the battery voltage stays above 8.7 V while starting engine..
- If 8.7 V or below refer to Battery Inspection/Test
- If greater than 8.7 V conduct Battery Electrical Drain/Parasitic Load Test using an inductive probe.
- If parasitic current is less than 100mA, replace Battery Sensor Module.
- If parameters read Available (Learned) and No (Measured) or reads Not Available (Not Learned) and Yes (Estimated)
- Verify the autostop and autostart functions are functioning properly while operating the vehicle under the conditions for entering a start/stop event. Refer to Stop/Start System Description and Operation (with KL9) .
- If the vehicle does not autostop or autostart
- Observe the scan tool Autostop Disable Reason, Autostop Inhibit Reason, Autostart Inhibit, and Autostart Reason parameters while operating the vehicle under the conditions for entering a start/stop event. Refer to Stop/Start Disable, Inhibit, and Restart Reasons . These parameters will identify the specific cause for the autostop or autostart disable.
- If the vehicle autostops and autostarts
- Verify the infotainment system remains active during a start/stop event.
- If the infotainment system turns off or restarts during a start/stop event.
Refer to Circuit/System Testing - Power Supply Transformer Circuit Malfunction
- If the infotainment system remains active during a start/stop event
- If the infotainment system turns off or restarts during a start/stop event.
- All OK.
NOTE:
If parameters read Not Available (Not Learned) and Yes (Estimated) the vehicle needs to sit for 3 hours undisturbed but is not required to have the start/stop enabled. After a 3 hour Battery Sensor Module Learn the parameters Battery Sensor Module Battery State Information and Battery Sensor Module Reset Occurred - Using Estimated State of Charge change to Available (Learned) and No (Measured) after the engine is cranked.
NOTE:
A vehicle hoist can be used to verify the autostop and autostart operation.