System Operation Description: This procedure tests whether proper voltage is being supplied to the Engine Control Module (ECM). The ECM receives electrical power (battery voltage)…

System Operation Description: “Idle Shutdown Timer” The “Idle Shutdown Timer” is intended to improve fuel economy by limiting idling time. The “Idle Shutdown Timer” is…

System Operation Description: Use this procedure under the following situation: The circuit for the fan override switch is suspected of incorrect operation. Note: This procedure…

System Operation Description: The troubleshooting procedures for the diagnostic codes of each temperature sensor are identical. The temperature sensors are sensors that have two terminals.…

System Operation Description: Use this procedure under the following situation: • There is an active diagnostic code or an easily repeated diagnostic code that is…

System Operation Description: Use this procedure under the following situation: The Engine Shutdown Output Circuit is suspected of incorrect operation. The following background information is…

System Operation Description: Use this procedure under the following situation: The engine running output circuit is suspected of incorrect operation. The following background information is…

System Operation Description: The troubleshooting procedures for the diagnostic codes of each pressure sensor are identical. The Engine Control Module (ECM) sends a 5 Volt…

System Operation Description: During normal operation, coolant is sent to the air intake system in order to cool the intake air. A jacket water aftercooler…

System Operation Description: Most electrical problems are caused by poor connections. The following procedure will assist in detecting problems due to connectors. If a problem…