Operation Section Table 2. Diagnostic Fault Codes (Flash Codes) cont’d. (*) Fault actions shown are default values specified by the OEM. 71 DFC PROBABLE FAULT FAULT ACTION * CORRECTIVE ACTION FIRST CHECK 432 EST2 Short _ EST2 output shorted high or low, EST2 signal shorted to ground or power or defective spark module TurnOnMil Check coil driver wiring and connector for shorts SECM Pin A10 (EST2) to ignition module Pin D (4-pin connector) Verify GND on ignition module Pin A (of both connectors) Verify +12 Vdc on ignition module Pin B (of both connectors) Refer to application manual for specific engine details.
433 EST3 Short _ EST3 output shorted high or low, EST3 signal shorted to ground or power or defective spark module TurnOnMil Check coil driver wiring and connector for shorts SECM Pin A3 (EST3) to ignition module Pin D (4-pin connector) Verify GND on ignition module Pin A (of both connectors) Verify +12 Vdc on ignition module Pin B (of both connectors) Refer to application manual for specific engine details.
434 EST4 Short _ EST4 output shorted high or low, EST4 signal shorted to ground or power or defective spark module TurnOnMil Check coil driver wiring and connector for shorts SECM Pin A6 (EST4) to ignition module Pin D (4-pin connector) Verify GND on ignition module Pin A (of both connectors) Verify +12 Vdc on ignition module Pin B (of both connectors) Refer to application manual for specific engine details. 435 EST5 Short _ EST5 output shorted high or low, EST5 signal shorted to ground or power or defective spark module None N/A 436 EST6 Short _ EST6 output shorted high or low, EST6 signal shorted to ground or power or defective spark module None N/A