Battery pack low cell voltage
• If it happens only one or two times between two service intervals, reset DTC. If the error appear more frequently continue with next action • Check if TMS have set any DTC’s regarding plausibility check. If so the primary error might not be connected to the RES. • If the vehicle have been operating very intensive the last week; park the vehicle over night for 12h (U15 off) so the battery can perform cell balancing. The battery will do this on its own. • Perform a test drive with intensive acceleration and several long slow braking from high velocity >60km/h to stop. Make sure the battery gets fully discharged several times during the test drive. • Check if the DTC’s has returned. If so perform balancing routine one more time. • Read out the SOH value via SDP3. It should be above 52%. (A new battery exchange recommendation parameter will be available later) • Change battery pack (E83) according to instruction in multi and in co understanding with the vehicle owner hence it’s a very expensive part.
What you'll see
No driver-visible symptom recorded.
System reaction
•VOR, the hybrid system will not work since the battery will not be engaged. The DCC will not receive VCB-power and the 24-volt system will drain the 24-volt batteries. • Amber warning lamp "24V batteries not charged" and "Hybrid System Fault" is shown in ICL
Diagnostic depth
Component fault nr. 15 from the IBU indicates cell voltage below limit.
• Disturbed measurement frames • The battery have not had time to perform cell balancing which can cause high inaccuracies in the SOC-estimation • The vehicle have been parked for a long time so the battery pack (E83) have been drained by self discharge • Bad power control from TMS • Cells are defective or worn out