Volvo Owners Club Forum - View Single Post - CEM clean now PS (EPS) pump on all the time

supafly · May 6th, 2019, 00:40

Seven months later...

I invested in a laptop, new battery, hard drive, win 7 pro, and a vida dice set up. Finally got around to getting it all set up and went out to the car today to see if I could use it to help in this age long quest...

The car seems to run well apart from no power steering. When I was trying to fix it at the start, I remember hearing what sounded like a relay clicking very fast multiple times before the power steering initially came on permanently. Now the power steering isn't switching on at all.

In VIDA diagnostics there is no pump speed, it is at 0 rpm.

After clearing old codes what is left are the following: -

CEM-3A00 ECM, Software Faulty signal (I believe due to ecu remap to remove dpf faults)

ECM-0380 Glow plug relay Faulty signal

ECM-0406 EGR Position sensor Signal too high (I did an EGR block a while ago - related?)

ECM-C301 Control module, faulty software check sum ECM (I believe same root cause as CEM fault above

EPS-0050 Memory error ROM Internal fault
EPS-0053 Memory error ROM Internal fault

and some PHM and ADM (Phone and additive tank codes)

I'm beginning to think that it is due to a relay failure somewhere in the front of the car but am not sure unless someone knows what the EPS codes are pointing to...

I have found the following (but it doesn't really help me)

Definition:Memory Fault In ROM.

Internal FaultDescription:The electrical power steering module (EPS) monitors the internal memory function of the control module. The diagnostic trouble code (DTC) is stored if the electrical power steering module (EPS) registers that reading from or storing data to the internal EEPROM for the control module is not functioning correctly. The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

The electrical power steering module (EPS) monitors the internal memory function of the control module. The diagnostic trouble code (DTC) is stored in the electrical power steering module (EPS) if the electrical power steering module (EPS) detects that the control module EEPROM is not programmed with vehicle profile software. The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.

I'm stuck again now, I have trouble believing that the PS pump has died. As I heard 'a relay' clicking loads when I first attempted to repair this, I'm thinking (hoping) it may be a damaged relay....

Does anyone know which relay(s) are involved in the EPS circuit and if there is a simple way of checking these relays?

May 6th, 2019, 00:40	#33
supafly Junior Member Last Online: Aug 8th, 2019 23:34 Join Date: May 2012 Location: Birmingham	Now with error codes Seven months later... I invested in a laptop, new battery, hard drive, win 7 pro, and a vida dice set up. Finally got around to getting it all set up and went out to the car today to see if I could use it to help in this age long quest... The car seems to run well apart from no power steering. When I was trying to fix it at the start, I remember hearing what sounded like a relay clicking very fast multiple times before the power steering initially came on permanently. Now the power steering isn't switching on at all. In VIDA diagnostics there is no pump speed, it is at 0 rpm. After clearing old codes what is left are the following: - CEM-3A00 ECM, Software Faulty signal (I believe due to ecu remap to remove dpf faults) ECM-0380 Glow plug relay Faulty signal ECM-0406 EGR Position sensor Signal too high (I did an EGR block a while ago - related?) ECM-C301 Control module, faulty software check sum ECM (I believe same root cause as CEM fault above EPS-0050 Memory error ROM Internal fault EPS-0053 Memory error ROM Internal fault and some PHM and ADM (Phone and additive tank codes) I'm beginning to think that it is due to a relay failure somewhere in the front of the car but am not sure unless someone knows what the EPS codes are pointing to... I have found the following (but it doesn't really help me) Definition:Memory Fault In ROM. Internal FaultDescription:The electrical power steering module (EPS) monitors the internal memory function of the control module. The diagnostic trouble code (DTC) is stored if the electrical power steering module (EPS) registers that reading from or storing data to the internal EEPROM for the control module is not functioning correctly. The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on. The electrical power steering module (EPS) monitors the internal memory function of the control module. The diagnostic trouble code (DTC) is stored in the electrical power steering module (EPS) if the electrical power steering module (EPS) detects that the control module EEPROM is not programmed with vehicle profile software. The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on. I'm stuck again now, I have trouble believing that the PS pump has died. As I heard 'a relay' clicking loads when I first attempted to repair this, I'm thinking (hoping) it may be a damaged relay.... Does anyone know which relay(s) are involved in the EPS circuit and if there is a simple way of checking these relays? Last edited by supafly; May 6th, 2019 at 00:42.