G420E/G424E Tier LP Engine Advanced Diagnostics 50
Table a. MI-04 Diagnostic Fault Codes (Flash Codes)
DFC Probable Fault Action Corrective Action, First Check
26 ETCSticking
Throttle plate sticking inside the
throttle body or the ETC driver signal
is open
Engine Shutdown
Check for debris or obstructions
inside the throttle body
Perform the Throttle test using the
Service Tool and re-check for fault
Check throttle-plate shaft for bearing
wear
Check the ETC driver wiring for an
open circuit
ETC+ PIN 1 to SECM PIN 22
ETC-PIN 4 to SECM PIN 24
Check the ETC internal motor drive
by disconnecting the throttle
connector and measuring the motor
drive resistance at the throttle
TPS PIN 1 (+DRIVER) to PIN 4 (-
DRIVER) ~3.0
Ω
+/-30%
27 PredictedTPSDifference
Measured TPS1 is different than
SECM Calculated throttle position
Engine Shutdown Check for manifold leaks between the
throttle and the engine
Note: Fault Code 27 is predicted
TPS. This fault means that the throttle
and our calculated prediction for
throttle do not agree. This code often
comes up as suspected during
transient manuevers. It is not system
trouble. If the fault really sets, then
the engine will shut down.
28 ETCSpringTestFailed
Upon initial key-up the internal
throttle return spring has become
weak
Power Limit Perform throttle spring test by cycling
the ignition key and re-check for fault
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