Hi,
I got a trade in engine E90DSLINS/5337365 which is throwing code 18 approx. 1 minute after firing up. I have spent several hours to locate the problem. Before fault code lights up, I can rev the engine to max rpm, but as soon as the fault code appears, I can not rev it above 1200 rpm. Here is what I have done so far:
*Switched to a brand new battery and terminals.
*Checked voltage at battery while engine is running. Voltage raised from 12,8 V to about 14.4, so I assume the charging is functioning.
*Ran EvDiagnostics and noticed charging amp readings is quite low varying from 0,8 to 2 amps when idling. When reving up to the limited 1200 rpm I get charging amps to about 5 A. Still quite low right?
*Changed capacitor (borrowed a larger capacitor from an E-Tec 300 hp). As no difference occured, I switched back to the original capacitor.
*Measured stator resistance at J2 connector, all three pairs measured about 0,7-0,8 Ohm.
*Measured stator AC voltage output while cranking the engine. As I don´t have the stator test adaptor, I measured each pair of the stator windings at the J2 connector and it showed about 12,4 V each, so together it will be far above 30 V as stated minimum.
*Measured alternator circuit between red and white/red at J2 connector. With key ON it shows about 0.5 V less than battery. When engine is running it shows about 55-56 V.
*Checked wirings and terminals for corrosion and acids etc. Sprayed electronics fluid at EMM contacts.
I have an engine report, but it doesnt seem that I can upload it here. However as I can see, the EMM has been replaced once, since it has not as many hours as the engine. Do you think it is another EMM problem? What do you suggest I try next for troubleshooting?
I got a trade in engine E90DSLINS/5337365 which is throwing code 18 approx. 1 minute after firing up. I have spent several hours to locate the problem. Before fault code lights up, I can rev the engine to max rpm, but as soon as the fault code appears, I can not rev it above 1200 rpm. Here is what I have done so far:
*Switched to a brand new battery and terminals.
*Checked voltage at battery while engine is running. Voltage raised from 12,8 V to about 14.4, so I assume the charging is functioning.
*Ran EvDiagnostics and noticed charging amp readings is quite low varying from 0,8 to 2 amps when idling. When reving up to the limited 1200 rpm I get charging amps to about 5 A. Still quite low right?
*Changed capacitor (borrowed a larger capacitor from an E-Tec 300 hp). As no difference occured, I switched back to the original capacitor.
*Measured stator resistance at J2 connector, all three pairs measured about 0,7-0,8 Ohm.
*Measured stator AC voltage output while cranking the engine. As I don´t have the stator test adaptor, I measured each pair of the stator windings at the J2 connector and it showed about 12,4 V each, so together it will be far above 30 V as stated minimum.
*Measured alternator circuit between red and white/red at J2 connector. With key ON it shows about 0.5 V less than battery. When engine is running it shows about 55-56 V.
*Checked wirings and terminals for corrosion and acids etc. Sprayed electronics fluid at EMM contacts.
I have an engine report, but it doesnt seem that I can upload it here. However as I can see, the EMM has been replaced once, since it has not as many hours as the engine. Do you think it is another EMM problem? What do you suggest I try next for troubleshooting?
