ETM Problems - 1999 Volvo V70 T5 Manual - UK
 

Hi All,

I have been battling my problematic ETM (I think) for a while now, and I could really do with some advice. Below I have tried to list out as much as I can about the problems I am facing and what steps I have taken to resolve them. I have a couple more tests to do (listed below) when I get back to my parents where the car is being stored. Can anyone help me make an informed decision on what to do next?

Symptoms:

Pre-rebuild (ECU Testing)
- Intermittent ETS lamp and slight stumble just before illumination
- ECM-91A7
- NO limp home mode
- ECM-261A Long Term Fuel Trim, Bank 1 - Upper Limit (very intermittent - more common on LPG)

Post-rebuild (ECU Testing)
- Hunting for idle after codes cleared - settles sometimes (as it learns?)
- Surging while driving all the time
- Intermittent ETS light
- ECM-91B7
- NO limp home mode
- ECM-261A Long Term Fuel Trim, Bank 1 - Upper Limit (very intermittent)

ETM Details:

White Label Magneti Marelli

Part Numbers (From Label)

• 1103DJR79
• 99W310101
• 9186793
• 65CFM2
• AH.0002030.J

Part Numbers (Software)

• 09458345 A (ETM - ECU Diagnostic Software Number)
• 0009497924 B (ETM - Software Part Number)
• 229,000 Miles
• No sweep test available (older software)

Diagnostic Steps Taken:

• Checked for MAF codes - None
• Checked for misfire codes - None
• Sent ETM to ECU Testing for rebuild
  - Inbound Test - No Faults
  - Rebuilt anyway (Sacer unit - not sure what else)
  - Outbound Test - No Faults
• Full Battery Test (Halfords) - Battery OK
• Voltage Testing
  - Pin 6 to positive battery terminal - same as battery
  - Pin 5 to negative battery terminal - no resistance (good ground?)
• Cleaned Ground Connection and Refitted
• Removed and Cleaned ETM and Lubricated Shaft
• Cleaned ETM Connectors with Electrical Contact Cleaner
• Replaced Throttle Pedal with Used (EBay)
• Removed Fuse 2 (ETM Fuse) with ignition on, engine off and re-installed - Clicks once, whines, clicks again. All within 10 seconds.
• Held throttle in FIXED POSITION against a block and created the attached graph.

Note - see throttle desired position fluctuating despite pedal being in one position
Note - both throttle position potentiometers seem relatively close to each other to me?

Diagnostic Steps Remaining:

Replace Engine Management Relay
Run wire between fuse and ETM plug
Check voltage across pins 5+6
Check voltage from fuse #2 to negative battery terminal

Options Remaining:

1. Return rebuilt unit for refund - still broken
2. Return rebuilt unit for refund and Pay Volvo dealer for diagnostics + new ETM + fitting + software (~£500 GBP)
3. Pay Volvo to install upgraded software on rebuilt unit
4. Return rebuilt unit for refund, pay for XeMODeX pre-programmed replacement ($829 USD or £635.91 GBP)
5. Wait for my Volvo friend to break his early 1999 V70 T5 Automatic (mine is a manual) for me to test his used ETM and Throttle Pedal - no idea when that’ll be.