Holset HE341Ve Service Manual - Fault Finding Chart
HE341Ve Service Manual
Troubleshooting and Diagnosis
3:3
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
Variable geometry nozzle movement slow or inconsistent
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. Repair pin or wire damage by renewing connectors
and leads. If no damage, remove 4-bolt actuator coverplate to expose actuator rod end.
Apply separate voltage to motor using service test equipment. Fully retract rod end using
voltage toggle switch. Drive actuator through full cycle using toggle switch and measure
cycle time. If time is within specification, replace position sensor. If nozzle movement
remains slow or inconsistent, remove actuator assembly and, locking pliers, ensure cross
shaft lever moves under light to medium force. If cross shaft offers excessive resistance
to movement replace turbocharger. If cross shaft motion is acceptable, reapply separate
voltage to motor. If rod shows signs of stiction, replace actuator. If rod of new assembled
actuator still suspect, recheck ECM. Where position sensor malfunction continues to
affect engine operation, ECM will fully open VG nozzle to enable limp home facility.
VG mechanism intermittent jamming
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. Repair pin or wire damage by renewing connectors
and leads. If no damage, remove 4-bolt actuator coverplate to expose actuator rod end.
Apply separate voltage to motor using service test equipment. If actuator travels within
range specified by service manual, fully retract rod end using voltage toggle switch. Drive
actuator through full cycle using toggle switch and measure cycle time. If time is within
specification, replace position sensor. If actuator movement remains slow or inconsistent,
remove actuator assembly and, using locking pliers, ensure cross shaft lever moves
under light to medium force. If cross shaft offers excessive resistance to movement
replace turbocharger. If cross shaft motion is acceptable, reapply separate voltage to
motor of replacement actuator using service tool. If rod of new assembled actuator still
slow or inconsistent, then, recheck ECM. Where position sensor malfunction continues to
affect engine operation, ECM will fully open VG nozzle to enable limp home facility.
Pivot block seized on cross shaft pin
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. If
actuator rod travel restricted, ensure pivot block moves freely on cross shaft pin. If no
axial or rotary movement or if force required to move block, then replace turbocharger.
No speed signal
Refer to ECM diagnostics for possible fault code data. Check sensor connections. If pin
resistance measurement is incorrect replace sensor. Where sensor may have been
overheated check ECM diagnostic fault codes and if necessary replace sensor.
Intermittent or noisy speed signal
Refer to ECM diagnostics for possible fault code data. Check sensor with multimeter. If
either resistance measurement is incorrect replace sensor. Where sensor may have been
overheated check ECM diagnostic fault codes and if necessary replace sensor.
No boost pressure signal (P2)
If the ECM diagnoses a boost pressure signal error refer to engine manual.
No air inlet temperature signal (T2)
If the ECM diagnoses an air inlet temperature signal error refer to engine manual.
Engine will not Start