1996/01/23 Caterpillar

False Logging Of Engine Retarder Diagnostic Codes{1900,1901,1119}

Usage:

3176B (9CK),
3406E (5EK) Truck Engines

Some 3176B and 3406E Truck Engines that are NOT equipped with an engine retarder have active or logged retarder solenoid diagnostic codes (121-05, 121-06, 122-05, and 122-06). These diagnostic codes have no effect on the vehicles' performance, but the vehicles are brought in for service because the diagnostic lamp is on. Frequently, when troubleshooting this problem, the service technician disconnects all wires from the electronic control module (ECM) that relate to the engine retarder solenoids and dash switches. However, the problem may remain, and the technician replaces the ECM. This is NOT necessary.

To fix this problem, FLASH the ECM with NOV95 software. Then, program the newly added customer specified parameter "Engine Retarder Minimum Vehicle Speed" to 127 mph. This will prevent the ECM from attempting to turn on the engine retarder and logging a diagnostic code on vehicles that are not equipped with an engine retarder. For vehicles that ARE equipped with an engine retarder, use the troubleshooting procedure given in the Electronic Troubleshooting Guide, SENR5582.

Caterpillar Information System:

1996/01/23 Corrupted Fleet Trip Data{1900}

1996/01/23 Remanufactured Product Update{7754}

1996/01/23 Governor Spring Guide Press Depth{1287,1284}

1996/01/23 New Air Fuel Ratio Control (FARC) Air Line Routing For 3306 Truck Engines In Kenworth Trucks{1278}

1996/01/23 Tamper Resistant Plugs And Tamper Resistant Bolts Used To Prevent Changes To Air Fuel Ratio Control (AFRC) Setting{1278,1287}

1996/01/23 New Valve Cover Gasket{1107}

1996/01/23 Caterpillar Electronic Technician (CAT ET){0700}

1996/01/23 Mixing Caterpillar Long Life Coolant/Antifreeze (LLCA) With Conventional Cat Diesel Engine Antifreeze/Coolant And/Or Other Commercially Available Diesel Engine Antifreeze/Coolants Is Not Recommended{1395}

1995/12/15 Flashing 3176B And 3406E Personality Modules With NOV95 Software {1901}

1995/12/15 Software Update May Be Required When Changing Fuel Injectors {1900,1902,1290}

1995/12/15 New Stronger Elbow Used In Turbocharger Oil Lines Groups {1307}

1995/12/15 Engine Replacement {1000}

1996/01/23 Basic Electronic Troubleshooting Guide Is Now Available{1900}

1996/02/26 New Engine Information Plates Require More Information{1000}

1996/02/26 Fuel Injector Sleeve Replacement Tooling{0703,1125}

1996/02/26 Lubricant Used On Cylinder Head Bolts Changed{1100}

1996/02/26 New Engine Cylinder Head Injector Sleeve Used In Both Mechanical Unit Injection (MUI) And Hydraulic Electronic Unit Injection (HEUI) Engines{1125}

1996/02/26 New Material Used In O-Rings And Optional New Block Side Cover Replacement{1201}

1996/02/26 Modification For 9U-7256 Guide Assembly (Camshaft){1210,0701,0702,0703}

1996/02/26 New Oil Pan Resists Cracking{1302}

1996/02/26 Troubleshooting Information For Horton Diesltemp© Fan Clutches{1359}

1996/02/26 Engine Coolant Loss And/Or Overheating Can Be Caused By Incorrect Shunt Line Connection{1380}

1996/02/26 New Speed/Timing Sensor {1912}

1996/03/27 Possible Sources of High Crankcase Blowby From Breather Tube{1317}