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
Check throttle-plate shaft for
bearing wear
z Check the ETC driver wiring for
an open circuit
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
29 ETCDriverFault
Throttle driver over-current or
driver signals shorted
Disable Throttle Check ETC driver wiring for a
shorted circuit
ETC+ PIN1 to SECM PIN 22
ETC- PIN 4 to SECM PIN 24
Perform Throttle test and with the
Service Tool and re-check for fault
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) ~3.0Ω +/-30%
33 MapSensorInputLow
MAP signal disconnected, open
circuit or sensor malfunction
(Expected faults when TMAP
connector is unplugged
CODES: 33 & 38)
Disable Throttle
Check TMAP connector and MAP
signal wiring for an open circuit
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