90-20Fault code 9131 · Diagnostic conditions

911 Turbo (996) Instrument cluster K20 90 90-20Fault code 9131 B+ Diagnostic conditions • Engine running Possible cause of fault ♦Open circuit of the charge lead between generator and battery (B+) Note! Both voltage values terminal 61 and 30 are compared to each other in the instrument cluster. If the voltage value at terminal 30 decreases severely as opposed to terminal 61, the battery is not charged when the vehicle is in motion (e.g. open circuit in B+ wire) and fault 9131 is stored. Affected terminals Plug B, terminals 2 and 18 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Visual inspection ♦Check B+ connection to genera- ⇒ Step 2 Clean or fasten the tor for fastening and corrosion connection → End 2 Check battery ⇒ Step 3 Replace battery → End 3 Check B+ wire from gen- ♦Loosen B+ wire on generator < 5Ω ⇒ Step 5 erator to positive terminal ⇒ Step 4 ♦Measure resistance to B+ wire of the battery for open cir- and positive terminal of the bat- cuit tery 9025 Fault code 9131 90-20 page 1 Printed in Germany – 8, 2001 9131xk20