Operation Section
-107-
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
z
Check throttle-plate shaft for
bearing wear
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
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
34 MapSensorInputHigh
TMAP sensor failure or shorted
circuit
Disable Throttle
Check TMAP connector and MAP
signal wiring for a shorted circuit
37 IATSensorInputLow
TMAP sensor failure or shorted
circuit
Stored Fault Code
(MIL Only)
Check TMAP connector and IAT
signal wiring for a shorted circuit
38 IATSensorInputHigh
IAT signal disconnected, open circuit
or sensor malfunction
Stored Fault Code
(MIL Only)
Check TMAP connector and IAT
signal wiring for an open circuit
