Operation Section Table 2. Diagnostic Fault Codes (Flash Codes) cont’d. (*) Fault actions shown are default values specified by the OEM. 72 DFC PROBABLE FAULT FAULT ACTION * CORRECTIVE ACTION FIRST CHECK 437 EST7 Short _ EST7 output shorted high or low, EST7 signal shorted to ground or power or defective spark module None N/A 438 EST8 Short _ EST8 output shorted high or low, EST8 signal shorted to ground or power or defective spark module None N/A 461 (26) ETC Sticking _ Electronic Throttle Control is sticking. This can occur if the throttle plate (butterfly valve) inside the throttle bore is sticking.
The plate sticking can be due to some type of obstruction, a loose throttle plate, or worn components shaft bearings. NOTE: The throttle assembly is not a serviceable item and can only be repaired by replacing the DV-EV throttle assembly.
(1) TurnOnMil (2) EngineShutdown (3) CutThrottle 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 SECM Pin A17 to ETC + Pin 1 SECM Pin A18 to ETC - Pin 4 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) ~3.0-4.0Ω 471 ETC Open Fault _ _ Electronic Throttle Control Driver has failed, normally set if either of the ETC driver signals have opened or become disconnected, electronic throttle or SECM is defective.
None Check the ETC driver wiring for an open circuit SECM Pin A17 to ETC + Pin 1 SECM Pin A18 to ETC - Pin 4 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) ~3.0-4.0Ω 481 (28) ETCSpringTest Electronic Throttle Control Spring Return Test has failed. The SECM will perform a safety test of the throttle return spring following engine shutdown. If this spring has become weak the throttle will fail the test and set the fault. NOTE: The throttle assembly is not a serviceable item and can only be repaired by replacing the DV-EV throttle assembly.
(1) TurnOnMil (2) EngineShutdown Perform throttle spring test by cycling the ignition key and re-check for fault