Troubleshooting Blink Code Method for Retrieving Diagnostic Trouble Codes (All Except Early VP44 Pump Engines) NOTE: If engine has an electronic instrument panel with diagnostic gauge, refer to “Instrument Panel Method for Retrieving Diagnostic Trouble Codes” later in this section. On OEM applications that have a Fault Lamp, the ECU has the ability to display DTCs using blinking sequence of the fault lamp. To retrieve DTCs from the ECU using the “blink code” method: NOTE: The ECU blinks the codes in 2-digit codes only. See LISTING OF DIAGNOSTIC TROUBLE CODES (DTCS) later in this Group. 1. Turn the ignition switch 2. Press down Override Shutdown Switch (if equipped) for a few seconds. 3.
The Fault Lamp will begin to flash a code number. For example, flash three times...short pause...flash two times...long pause. This example is code 32. 4. The ECU begins the flashing sequence by flashing a code 32, this indicates the start of blinking active codes. If there are any active DTCs, the ECU will flash it’s 2–digit number. If there is more than one active DTC, the ECU will flash each code in numerical order. If there are no active DTCs, the Fault Lamp will flash a code 88. 5. Following the active codes, the Fault Lamp will flash a code 33. This indicates the start of blinking stored codes. If there are any stored DTCs, the Fault Lamp will flash its 2–digit number.
If there is more than one stored DTC, the ECU will flash each code in numerical order. If there are no stored DTCs, the Fault Lamp will flash a code 88. 6. Once complete, this sequence will repeat. 7. When complete, turn ignition Continued on next page OURGP12,00001EB –19–11MAR03–1/2 45-18 021604 PN=212