Hippo
Lord Hippo
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- 53,106
MY15 SD4 uk spec.
Drove home ok with no problem. Stop and start the engine twice to open gates and garage doors. On the second start 'restricted performance' appeared on the dash. Checked the diagnostic and no error codes. Looked at the dpf and it was on 22. Doesn't need regeneration to empty it until 24, but even at that figure it will continue to drive. Took it for a drive to perform a dpf regeneration and it didn't. FL was low on power all the way because the turbo's not running. Limited to 2k5 revs. Fault codes appeared half way through the trip as below. This is the first time this fault has appeared. Fault seems permanent.
P0046-19 (AF) turbo boost control solenoid - circuit range/performance - general electrical failure - circuit current above threshold.
P0047-11 (AC) turbo boost control solenoid - circuit low - general electrical failure - circuit short to ground.
P259E-73 (EC) turbo A boost control position at low limit - mechanical failure - actuator is stuck closed.
Lots of different views and similar codes from others who have had the same problem. Normally actuator or turbo needs replaced.
Took it home to investigate. Tried cleaning the actuator 5 way connection. Fault still present. Took the connector off and measured the wiring harness resistance to battery negative 0v terminal results as below:
Yellow 1749ohm
Gray 0.2ohm
Yellow blue 10k51ohm
Blue 4meg ohm
White 4meg ohm
Looking at the circuit in the big FL2 maintenance manual on page 3119 shows all 5 wires going directly to the ECM Engine Control Module. Can anyone confirm from their own measurements if the gray wire should be connected directly to 0v or not?
I don't know if this wire is a 0v signal return path or if the actuator uses it's metal case connection for the 0v return. If so then this is my fault.
Further investigation: actuator arm will move if you push it. Springs back by itself. Followed the wiring harness taking all connectors oft other items one at a time, to the top rear of the engine. Only one I can't see to disconnect. Made no difference to the measurement on the gray wire. Took the 3 connectors oft the Engine Control Module which sits to the rear of the engine, under the wipers, and the gray wire short to 0v disappears. Through process of elimination I worked out the left and right connectors need to be fitted for the short to appear. Still looking at this but can't find any resistance values other owners have put online for the actuator vane 5 wire connection.
Edit: answer yes, it's a wired 0v singal in the harness.
Drove home ok with no problem. Stop and start the engine twice to open gates and garage doors. On the second start 'restricted performance' appeared on the dash. Checked the diagnostic and no error codes. Looked at the dpf and it was on 22. Doesn't need regeneration to empty it until 24, but even at that figure it will continue to drive. Took it for a drive to perform a dpf regeneration and it didn't. FL was low on power all the way because the turbo's not running. Limited to 2k5 revs. Fault codes appeared half way through the trip as below. This is the first time this fault has appeared. Fault seems permanent.
P0046-19 (AF) turbo boost control solenoid - circuit range/performance - general electrical failure - circuit current above threshold.
P0047-11 (AC) turbo boost control solenoid - circuit low - general electrical failure - circuit short to ground.
P259E-73 (EC) turbo A boost control position at low limit - mechanical failure - actuator is stuck closed.
Lots of different views and similar codes from others who have had the same problem. Normally actuator or turbo needs replaced.
Took it home to investigate. Tried cleaning the actuator 5 way connection. Fault still present. Took the connector off and measured the wiring harness resistance to battery negative 0v terminal results as below:
Yellow 1749ohm
Gray 0.2ohm
Yellow blue 10k51ohm
Blue 4meg ohm
White 4meg ohm
Looking at the circuit in the big FL2 maintenance manual on page 3119 shows all 5 wires going directly to the ECM Engine Control Module. Can anyone confirm from their own measurements if the gray wire should be connected directly to 0v or not?
I don't know if this wire is a 0v signal return path or if the actuator uses it's metal case connection for the 0v return. If so then this is my fault.
Further investigation: actuator arm will move if you push it. Springs back by itself. Followed the wiring harness taking all connectors oft other items one at a time, to the top rear of the engine. Only one I can't see to disconnect. Made no difference to the measurement on the gray wire. Took the 3 connectors oft the Engine Control Module which sits to the rear of the engine, under the wipers, and the gray wire short to 0v disappears. Through process of elimination I worked out the left and right connectors need to be fitted for the short to appear. Still looking at this but can't find any resistance values other owners have put online for the actuator vane 5 wire connection.
Edit: answer yes, it's a wired 0v singal in the harness.
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