Series 40E Troubleshooting – Section 10.10 Sti Button — Flash Codes

Figure 1. Diagnostic Form

The following procedure will lead you through the Self Test Input (STI) to read faults. See Figure
“Diagnostic Form”

. ‪

Section 10.10.1
Purpose

The purpose of the STI is to read faults detected by the ECM if the Electronic Service Tool (EST) is not available, or the EST cannot receive STI data due to communications or component failures.‪

Depressing the STI switch while turning the ignition switch to the ON position, will signal the ECM to perform an Output Circuit Check self test. If any faults are detected, the ECM will flash the Warn Engine light to indicate which faults have been detected.‪

Section 10.10.2
Test Procedure

Depress and hold the STI switch. Turn the ignition switch to the ON position. Do not start the engine. The ECM will begin to perform the self test to check the output circuits.‪

When the test is completed, the ECM will flash the red Oil/Water light and amber Warn Engine light to signal the fault codes.‪

Note: Fault codes can be accessed at any time by depressing and holding the STI switch while turning the ignition switch to the ON position. Do not start the engine.

To read the fault codes, it will be necessary to count the number of times the Engine Warn light flashes. The following sequence of events occurs each time the STI switch is depressed to obtain the fault codes.‪

1. The Oil/Water light will flash one time to indicate the beginning of active fault codes.
2. The Warn Engine light will flash repeatedly signaling the active fault codes.Note: All fault codes are three digits and code 111 indicates no faults have been detected.
3. Count the number of flashes in sequence. At the end of each digit of the code, there will be a short pause. Three flashes and a pause would indicate the number 3. Therefore, two flashes, a pause, three flashes and a pause, and two flashes and a pause would indicate the code 232. If there is more than one fault code, the Oil Water light will flash once indicating the beginning of another active fault code.

After all the active codes have been flashed, the Oil/Water light will flash twice to indicate the beginning of inactive codes. Count the number of flashes from the Warn Engine light. If there is more than one inactive code, the Oil/Water light will flash once in between each fault code.‪

After all codes have been sent, the Oil/Water light will flash three times indicating END OF MESSAGE.‪

To repeat transmission of fault codes, depress the Engine Diagnostics switch to signal the ECM to send all stored fault codes again.‪

If fault codes are set, refer to the Electronic Diagnostic Form; refer to “10.1 Introduction”

, and fault code diagnostics.‪

Section 10.10.3
Possible Causes

The possible cause of the hard start/no start diagnostics is an electronic component or circuitry failure.‪

Section 10.10.4
Tools Required

None.‪