Usage:
Challenger 75C (4KK),
Challenger 75D (5AR),
Challenger 85C (9TK),
Challenger 85D (4GR) Agricultural Tractors
- SUPPLEMENT: 01/27/97
Service Magazine; December 30, 1996; Page 3;;; "Description Of August 1996 (AUG96) Personality Module Changes For 3176B (43Z), 3176C (7ZR), And 3196 (6AR) Engines".
In Chart A, the number at the intersection of the FLASH File No. column and the Challenger 85D row (125-1443.02) is not correct. The correct FLASH File No. for the Challenger 85D is 126-1443.
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Reference: Service Magazine; March 4, 1996; Page 5; "Flash Programming Capability is Required".
The following is a list of new features and changes for the latest personality module releases for the 3176B (43Z), 3176C (7ZR), And 3196 (6AR) Engines in the above agricultural tractors. The personality modules can be identified by release date JUL96 for "C" Series Agricultural Tractors or AUG96 for "D" Series Agricultural Tractors using a Caterpillar Service Tool. To service an engine with 1996 software, the service tool should also have current software. Electronic Technician (ET) should have JERD 2142 or JERD 2129 Version 1.5 software. Electronic Control Analyzer And Programmer (ECAP) should have Service Program Module (SPM) NEXG451 8, Version 1.2. New electronic troubleshooting guides are also available. Use "3176B Electronic Trouble Shooting (43Z768-Up)", SENR6452-01 for Challenger "C" Series Agricultural Tractors. Use "3176C And 3196 Engines For 75D And 85D Agricultural Tractors", RENR1240 for Challenger "D" Series Agricultural Tractors.
The AUG96 software is factory installed on all Challenger "D" Series Agricultural Tractors. The JUL96 software is a maintenance update for Challenger 75C (4KK500 - Up) and Challenger 85C (9TK) Agricultural Tractors. There are no "C" Series Agricultural Tractors with factory installed JUL96 software. When updating engine software, make sure to explain the new features and changes to the customer.
The 1996 service personality modules and FLASH files are listed in Chart A. Current information about FLASH files can also be obtained using the Caterpillar FIND system (Search Document Types: FLASH; Keyword: Challenger). The Service Replacement Part Number in Chart A is the part number of the pre-flashed memory chip that can be changed in the ECM. This allows service locations that are not FLASH capable to update software on some "C" Series Agricultural Tractors. See the Reference Article for more information when FLASH programming requirements were implemented. No service replacement part numbers are available for "D" Series Agricultural Tractors because the memory chips in their Electronic Control Modules (ECMs) can NOT be removed. "D" Series Agricultural Tractors are FLASH updateable only. The interlock or personality module code and is used by the ECM to identify a particular family of engine software files.
Features
1. The engine will no longer enter a low power protection (derate) mode when diagnostic code 108-03 or 108-04 (flash code 26) "Atmospheric Pressure Sensor Open or Short Circuit" code is active ("C" and "D" Series Agricultural Tractors).
2. Fuel pressure monitoring has been added ("D" Series Agricultural Tractors only).
3. Multi-Torque (Triple Hp) operation has been added (85D Agricultural Tractors only).
There have been no new customer parameter additions.
Diagnostic And Service Improvements
1. The electronic service tool feature that allows a service technician to override the automatic multi-torque (dual Hp) on Challenger 85C Agricultural Tractors was expanded for use on the multi-torque (triple Hp) Challenger 85D Agricultural Tractors. This allows manual selection of the low, middle, or high horsepower rating. The rating selection remains active until the service technician turns the override off or the engine is shut down and restarted. This allows the service technician to go to other service tool screens or even disconnect the service tool and go for a test drive. Multi-torque override allows engine dynamometer testing at low, middle, or high horsepower ratings and reduces time to troubleshoot electronic system problems. This feature is called "Override Parameters" and can be found in the "Interactive Diagnostics" section of the service tool.
2. An electronic service tool can display whether the 3196 engine in Challenger 85D Agricultural Tractors is operating in the low, middle, or high horsepower mode. This can be done by viewing the "Multi-Trq Mode" status parameter.
3. An altitude derate status parameter called "Alt Derate" has been added. If the engine detects operation at altitude and power is being limited "Active" will be displayed. The altitude derate is a gradual reduction in power that starts to take effect between 2286 m (7,500 ft) and 3657 m (12,000 ft) depending on Challenger model. "Not Active" will be displayed if the engine is NOT being operated at altitude.
4. For "D" Series Agricultural Tractors, several new diagnostic codes have been added. See Chart B.
5. For both "C" and "D" Series Agricultural Tractors, some diagnostic codes have been REMOVED. See Chart C.
6. The fuel pressure status parameter is no longer displayed on "C" Series Agricultural Tractors (4KK500-Up and 9TK1-Up) with 3176B engines as these engines do not have fuel pressure sensors.
Electronic System Improvements
1. The diagnostic (fault) code strategy for Challenger 85C transmission pressure sensors has been improved. This will reduce false logging of the diagnostic code 35-11 (flash code 91) which can cause the engine to be locked into Low HP mode.
2. Diagnostic code 190-02 (flash code 34), "Loss of Engine RPM Signal", is no longer active when the engine is not running. With the engine OFF, "55" will be flashed if no other diagnostic codes are present.
3. The correct altitude derate information is now provided to the data link. This information is used in the display status screens of the service tool.
4. Logged events such as Engine Overspeed Warning can now be cleared from the service tool display.