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Check Engine Light
A cab mounted "Check Engine" light is included with the 3176 engine. The "Check Engine" light indicates an engine fault condition or a 3176 system fault.If the check engine lamp is on during normal engine operation, the 3176 has detected a system fault. If the Check Engine light comes on and stays on after initial start-up, the 3176 has detected a system fault. Use the Check Engine light in the cab or service tools to identify the diagnostic code. Check Engine Light - The "Check Engine" light will be ON and will blink every five seconds whenever a diagnostic fault is detected by the ECM. The light should also be ON whenever the START switch is turned on, but the engine is not running. This condition will test whether the light is operating correctly.Self-Diagnostics
The 3176 Truck Engine has a limited ability to diagnose itself. When the System detects a problem, a Diagnostic Code is generated which activates the Diagnostic Lamp. In most cases the code will be stored in permanent memory in the ECM.Diagnostic Codes that represent current faults are called ACTIVE and indicate that a problem exists. These active diagnostic codes should be investigated first.Diagnostic Codes stores in memory are called LOGGED. The problem may have been temporary or repaired since the time it was LOGGED. These codes may not mean something needs to be repaired, but may be helpful indicators when INTERMITTENT problems exist, which could be used to troubleshoot and analyze potential problems. In addition, some logged diagnostic codes record events and performance history, rather than failures.Diagnostic Codes-Interpretation
When the vehicle is equipped with Cruise Control (CC)
1. Turn ignition key ON (engine does not need to be started to view codes).2. The Diagnostic Lamp will illuminate for five seconds, blink off, turn on again for five seconds, then off for five seconds. The lamp will then begin to flash the first number of the two-digit code (count the flashes). The lamp will blink off for two seconds, then begin to flash the second number of the two-digit code in the same manner as the first. If more than one code is present, they will follow the first code after a few seconds and be displayed in the same manner.3. Active diagnostic codes may be displayed at any time by using the Cruise Control (CC) Switches. The engine can be running or the ignition key ON. Turn the Cruise Control ON/OFF switch to OFF and move the SET/RESUME switch to RESUME position. The Check Engine Light will flash to indicate a 2-digit fault code and the switch may be released from the RESUME position.When the vehicle is NOT equipped with Cruise Control (CC):
Some trucks are equipped with a Check Engine Light Switch to check diagnostic codes. The Check Engine Light can be used to communicate the specific 3176 system diagnostic fault. The Check Engine light will flash to indicate the 2-digit diagnostic fault code. This can be done by connecting a push button momentary switch