Operation Section Table a. MI-04 Diagnostic Fault Codes (Flash Codes) 83 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