Holset HE341Ve Service Manual - Fault Finding Chart
HE341Ve Service Manual
Troubleshooting and Diagnosis
3:2
Fault Finding Chart
- Variable Geometry
Intermittent Low Power
Engine does not run Smoothly
Low Power at Low Engine Speed
T
urbocharger Noisy
Poor Acceleration
Engine Lacks Power
Engine Overheats
Intermittent Engine Braking
Reduced Braking
Coolant Leak
Oil Leak
Engine will not Start
Note
Normal motor operation is almost silent, hence a check of actuator rod movement is
required to confirm lack of motor activity.
Actuator rod not moving
Refer to ECM diagnostics for possible fault code data. To avoid feedback error to ECM
always disconnect and reconnect actuator motor and position sensor in correct sequence.
Disconnect motor before position sensor. Reconnect position sensor before motor. Check
actuator wiring for bad connections. Check motor and sensor pin resistances with
multimeter. Repair pin or wire damage by renewing connectors and leads. If no damage,
remove 4-bolt actuator coverplate to expose actuator rod end. Apply key-on calibration to
activate VG actuation sequence. If actuator rod travel is within range specified by service
manual, replace position sensor. If still no rod movement, remove actuator assembly and
reapply key-on calibration using equipment electrical supply. If rod does not move or if
endplay exceeds range specified by service manual under light load replace actuator. If
rod moves normally through specified travel, check ECM and, locking pliers (mole or vice
grips), ensure check cross shaft lever moves under light to medium force. If cross shaft
offers excessive or no resistance to movement replace turbocharger. If cross shaft motion
is acceptable and rod of reassembled actuator does not move, recheck ECM.
DC motor not driving
Refer to ECM diagnostics for possible fault code data. To avoid feedback error to ECM
always disconnect and reconnect actuator motor and position sensor in correct sequence.
Disconnect motor before position sensor. Reconnect position sensor before motor. Check
actuator wiring for bad connections. Check motor pin resistance with multimeter. Repair
pin or wire damage by renewing connectors and leads. Remove 4-bolt actuator coverplate
to expose actuator rod end. If actuator rod travel is within range specified by service
manual, recheck ECM. If no rod movement, replace actuator. Refer to
‘actuator rod not
moving’ for further fault finding.
Actuator motor or gears noisy
If actuator operates with excessive motor or gear noise, replace actuator.
Position sensor fault indication
Refer to ECM diagnostics for possible fault code data. To avoid feedback error to ECM
always disconnect and reconnect actuator motor and position sensor in correct sequence.
Disconnect motor before position sensor. Reconnect position sensor before motor. Ensure
sensor wiring for bad connections. Check sensor pin resistance with multimeter. Repair
pin or wire damage by renewing connectors and leads. If fault persists replace position
sensor. If new sensor still not working check ECM. Where position sensor malfunction
continues to affect engine operation, ECM will fully open VG nozzle to enable limp home
facility.
Position sensor nozzle open voltage outside range
Refer to ECM diagnostics for possible fault code data. To avoid feedback error to ECM
always disconnect and reconnect actuator motor and position sensor in correct sequence.
Disconnect motor before position sensor. Reconnect position sensor before motor. Check
sensor wiring for bad connections. Check sensor pin resistance with multimeter. Repair
pin or wire damage by renewing connectors and leads. Remove 4-bolt actuator coverplate
to expose actuator rod end. Check cross shaft is not fouling on actuator body screws.
Remove actuator and apply light axial load to rod to check endplay. If greater than
specified in service manual replace actuator. Refer to
‘position sensor voltage span
outside range’ for further fault finding. Where position sensor malfunction continues to
affect engine operation, ECM will fully open VG nozzle to enable limp home facility
Position sensor nozzle closed voltage outside range
Refer to ECM diagnostics for possible fault code data. To avoid feedback error to ECM
always disconnect and reconnect actuator motor and position sensor in correct sequence.
Disconnect motor before position sensor. Reconnect position sensor before motor. Check
sensor wiring for bad connections. Check sensor pin resistance with multimeter. Repair
pin or wire damage by renewing connectors and leads. Remove 4-bolt actuator coverplate
to expose actuator rod end. Check cross shaft is not fouling on actuator body screws.
Remove actuator and apply light axial load to rod to check endplay. If greater than
specified in service manual replace actuator. Refer to
‘position sensor voltage span
outside range’ for further fault finding. Where position sensor malfunction continues to
affect engine operation, ECM will fully open VG nozzle to enable limp home facility.
Position sensor voltage span outside range
Refer to ECM diagnostics for possible fault code data. To avoid feedback error to ECM
always disconnect and reconnect actuator motor and position sensor in correct sequence.
Disconnect motor before position sensor. Reconnect position sensor before motor. Check
sensor wiring for bad connections. Check sensor pin resistance with multimeter. Repair
pin or wire damage by renewing connectors and leads. Remove 4-bolt actuator coverplate
to expose actuator rod end. Ensure stroke of assembled actuator is within range specified
by service manual. If in range, check position sensor and ECM. If outside range, remove
actuator. Using light to medium load and locking pliers, check linear travel of cross shaft
pin is within same range specified for assembled actuator. If pin motion is
not in range replace turbocharger. If pin motion is in range, recheck stroke of actuator rod.
If less than specified by service manual, replace actuator. If turbocharger stroke and
actuator stroke are both in range, then check ECM. Where position sensor malfunction
continues to affect engine operation, ECM will fully open VG nozzle to enable limp home
facility.