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.
Diagnostic Codes
Functional Test
PB-20: Tachometer Circuit Test
System Operation
Schematic - 3116
Schematic - 3126
ECM Pin Locations
Functional Test
PB-21: ATA (SAE J1587/1708) Data Link Circuit Test
System Operation
Schematic - 3126
Schematic - 3116
ECM Pin Locations
Functional Test
PC-30: ECM Memory Test
System Operation
Diagnostic Codes
Functional Test
PC-31: Engine Speed/Timing Circuit Test
System Operation
Schematic
ECM Pin Locations
Diagnostic Codes
Functional Test
PC-32: Engine Speed/Timing Calibration
System Operation
Diagnostic Codes
Functional Test
PC-33: Injector Solenoids Circuit Test
System Operation
Schematic
ECM Pin Locations
Diagnostic Codes
Functional Test
PC-34: +5V Sensor Voltage Supply Circuit Test
System Operation
Schematic
ECM Pin Locations
Diagnostic Codes
Functional Test
PC-35: Engine Sensor Open or Short Circuit Test
System Operation
Schematic
ECM Pin Locations
Diagnostic Codes
Functional Test
PC-36: Injection Actuation Pressure Sensor Test
System Operation
Schematic
Diagnostic Codes
Functional Test
PC-37: Injection Actuation Pressure Control Valve Circuit Test
System Operation
Schematic
ECM Pin Locations
Diagnostic Codes
Functional Test
PC-38: Injection Actuation Pressure System Test
System Operation
Diagnostic Codes
Functional Test
PC-39: Inlet Air Heater Circuit Test
System Operation
Schematic
ECM Pin Locations
Diagnostic Codes
Inlet Air Heater Operation Chart (Personality Modules before JUN97)
Inlet Air Heater Operation Chart (JUN97 and later Personality Modules)
Functional Test
PC-40: Event Codes Test
System Operation
Diagnostic Codes
Functional Test