3100 HEUI DIESEL TRUCK ENGINE Caterpillar

Troubleshooting With A Diagnostic Code

Usage:

PB-10: Inspecting Electrical Connectors

System Operation

When to Use This Procedure

Use the following steps to help determine if the connector is the cause of the problem. If a problem is found in the electrical connector, repair the connector and verify that the problem has been fixed.

Background

Many of the Operational Procedures and Diagnostic Code Procedures in this troubleshooting guide will direct you to check a specific electrical connector. The 3100 HEUI Truck Engines use a variety of Deutsch and Packard connectors.

Intermittent electrical problems are often caused by poor connections. Always check for an Active Diagnostic Code before breaking any connections and check again immediately after reconnecting the connector to see if the problem disappears. Simply disconnecting and then reconnecting connectors can sometimes solve the problem. If this occurs, likely causes are loose pins, improperly crimped pins or corrosion. Follow this procedure to thoroughly inspect the connectors to determine if connectors are the cause of the problem.

3100 HEUI Connectors

Functional Test

PB-11: ECM Battery Circuits Test

System Operation

Schematic - 3126

Schematic - 3116

ECM Pin Locations

Diagnostic Codes

Functional Test

PB-12: Throttle Position Sensor Circuit Test

System Operation

Schematic: +8V Pedal Mounted Throttle Position Sensor

Schematic: +12V Pedal Mounted Throttle Position Sensor for PTO

ECM Pin Locations

Diagnostic Codes

Functional Test

PB-13: Check Engine/Service Engine Soon, or Fast Idle Enabled Lamp Test

System Operation

Schematic: 3116

Schematic: 3126

ECM Pin Locations

Functional Test

PB-14: Vehicle Speed Circuit Test

System Operation

Schematic 1- Single Coil Speed Sensor with ECM Driving Speedometer (Recommended)

Schematic 2- Single Coil Sensor for ECM, Second Single Coil Sensor for Speedometer

Schematic 3- Dual Coil Vehicle Speed Sensor

Schematic 4- Electronic Control Providing Vehicle Speed to Engine ECM

Schematic 5- GM Vehicle Speed Connection Diagram

ECM Pin Locations

Diagnostic Codes

Functional Test

Vehicle Speed Calibration And Adjustment

PB-15: Cruise Control, Fast Idle Enable and Kickout Switches Circuit Test

System Operation

Electronic Service Tool Cruise Control "Kickout" Status Screen Table

Electronic Service Tool Idle/PTO "Kickout" Status Screen Table

Electronic Service Tool Fast Idle "Kickout" Status Screen Table

Schematic - 3116

Schematic - 3126

ECM Pin Locations

Diagnostic Codes

Functional Test

PB-16: Multi-Function Input Switch Circuit Test

System Operation

Electronic Service Tool Idle/PTO Kickout Status Screen Table

Schematic 1- PTO Configuration Cab Switches

Schematic 2- PTO Configuration Remote Switches

Schematic 3- PTO Configuration Remote Throttle

Schematic 4- PTO Configuration Cab Switches with Torque Limiting and Disabling Brake/Clutch Kickout of PTO Set Speed

Schematic 5- PTO Configuration Remote Switches with Torque Limiting and Disabling Brake/Clutch Kickout of PTO Set Speed

ECM Pin Locations

Functional Test

PB-17: Service Brake #2 Switch Circuit Test

System Operation

Schematic - 3126

Schematic - 3116

ECM Pin Locations

Diagnostic Codes

Functional Test

PB-18: Exhaust Brake And Transmission Interface Circuits Test

System Operation

Schematic

ECM Pin Locations

Functional Test

PB-19: Idle Shutdown Timer Test

System Operation

When to Use This Procedure

Use this procedure to determine if the Idle Shutdown feature is operating correctly.

Background

The Idle Shutdown Timer is intended to improve fuel economy by limiting idling time.

The Customer Parameter Idle Shutdown may be programmed for any period from 3 to 60 minutes. The timer is activated when the vehicle speed is zero, the engine is not in Cold Mode or dedicated to PTO Mode, and the engine is not under load, regardless of the parking brake position. Ninety seconds before the programmed time is complete, the Check Engine/Service Engine Soon lamp will begin to flash rapidly. During the 90 second perriod, if the drive moves the clutch pedal or service brake pedal, a timer override may occur until the timer is reset. An event Code 71-00 Override of Idle Shutdown Timer (01) will be logged when the driver overrides the timer using the clutch or brake during the 90 second period.

If the parameter Allow Idle Shutdown Override is programmed to NO, the Timer can not be overridden using the brake or clutch during the final 90 second idle shutdown period. YES is the Caterpillar Factory programmed default for the Allow Idle Shutdown Override parameter (allowing override is the default).

If the timer is activated and allowed to shut down the engine, then an Event Code 71-01 Idle Shutdown Timed Out (47) will be set. Code 71-01 records the event and does not indicate an electrical/electronic system malfunction.

Disable the Timer by programming Idle Shutdown Time to zero (Caterpillar Factory Default).

The ECM will shut down the engine but not the vehicle electrical system when the Idle Shutdown Time expires.

The Idle Shutdown Feature can be temporarily disabled using an Electronic Service Tool through the System Troubleshooting Settings screen to help troubleshoot other problems and avoid nuisance engine shutdowns when troubleshooting other systems.

NOTE: If a 84-08 Vehicle Speed Signal Out Of Range (36) Diagnostic Code is Active, the Idle Shutdown Timer will not operate.