What is P2638 - Torque Management Feedback Performance
07-30-2003, 03:37 PM
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What is P2638 - Torque Management Feedback Performance
I saw this and I don't know what it is. Do I need to get this done ?
:-*
Date: July 4, 2003
THE MDS2 MUST BE OPERATING WITH CIS CD2137 OR HIGHER, AVAILABLE JULY 21, 2003.
Models: 2003 (DR) Ram Truck
NOTE. THIS BULLETIN APPLIES TO ALL RAM TRUCKS EQUIPPED WITH THE 5.9L CUMMINS 24-VALVE DIESEL ENGINE (SALES CODE ETC OR ETH) BUILT ON OR BEFORE JULY 25, 2003 (MDH 0725XX).
Overview:
This bulletin involves selectively erasing and reprogramming the Cummins CM845 Engine Control Module (ECM) with new software.
Symptom/Condition:
The vehicle may exhibit:
No throttle response if the engine is started with the Accelerator Pedal Position Sensor (APPS) in an off-idle position (pedal depressed) and the transmission is shifted into drive or reverse while the APPS remains in an off-idle position (pedal depressed), causing the engine to remain at idle,
Lack of power while towing or hauling a heavy load with the transmission in overdrive - vehicles equipped with 47RE transmission.
Technician may find the following DTC:
P2638 - Torque Management Feedback Performance - vehicles equipped with 48RE Transmissions.
This engine software includes a change to Sentry Key Immobilizer (SKIM) functionality and the APPS auto zero algorithm.
Diagnosis:
Using a Scan Tool (DRBIII) with the appropriate Diagnostic Procedures Manual, verify all engine systems are functioning as designed. If DTCs are present other than those listed above, record them on the repair order and repair as necessary before proceeding further with this bulletin.
If the vehicle exhibits any of the Symptom/Conditions, perform the Repair Procedure.
:-*
Date: July 4, 2003
THE MDS2 MUST BE OPERATING WITH CIS CD2137 OR HIGHER, AVAILABLE JULY 21, 2003.
Models: 2003 (DR) Ram Truck
NOTE. THIS BULLETIN APPLIES TO ALL RAM TRUCKS EQUIPPED WITH THE 5.9L CUMMINS 24-VALVE DIESEL ENGINE (SALES CODE ETC OR ETH) BUILT ON OR BEFORE JULY 25, 2003 (MDH 0725XX).
Overview:
This bulletin involves selectively erasing and reprogramming the Cummins CM845 Engine Control Module (ECM) with new software.
Symptom/Condition:
The vehicle may exhibit:
No throttle response if the engine is started with the Accelerator Pedal Position Sensor (APPS) in an off-idle position (pedal depressed) and the transmission is shifted into drive or reverse while the APPS remains in an off-idle position (pedal depressed), causing the engine to remain at idle,
Lack of power while towing or hauling a heavy load with the transmission in overdrive - vehicles equipped with 47RE transmission.
Technician may find the following DTC:
P2638 - Torque Management Feedback Performance - vehicles equipped with 48RE Transmissions.
This engine software includes a change to Sentry Key Immobilizer (SKIM) functionality and the APPS auto zero algorithm.
Diagnosis:
Using a Scan Tool (DRBIII) with the appropriate Diagnostic Procedures Manual, verify all engine systems are functioning as designed. If DTCs are present other than those listed above, record them on the repair order and repair as necessary before proceeding further with this bulletin.
If the vehicle exhibits any of the Symptom/Conditions, perform the Repair Procedure.
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