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Home >> Dodge or Ram Truck >> 2001 >> Dakota Quad Cab 4WD V8-5.9L VIN Z LDC >> Repair and Diagnosis >> Transmission and Drivetrain >> Transmission Control Systems >> Description and Operation >> Diagnostic Trouble Codes >> DTC Descriptions

DTC Descriptions

DIAGNOSTIC TROUBLE CODE (DTC) DESCRIPTIONS








Name of DTC: P0700(11) Internal Controller
When monitored: Whenever the key is in the Run or Run/Start position.
Set condition: This DTC is set whenever Transmission Control Module (TCM) senses an internal error.
Theory of operation: The TCM is constantly monitoring it's internal processor. If an internal problem is detected, this DTC will be set. This DTC can also be set by a bad ground to the TCM and/or Trans Control Relay. In fact, this DTC is rarely set due to a TCM error, it is usually set by a poor ground.
Transmission Effects: The MIL will illuminate and the transmission system will default to the Immediate Shutdown routine.
Possible causes:
^ TCM ground circuit. (check main ground attachment to engine block)
^ Relay ground circuit. (check main ground attachment to engine block)

Name of DTC: P-1792(12) - Battery was Disconnected (Info Only)
When monitored: Whenever the key is in the Run or Run/Start position.
Set condition: This DTC is set whenever Transmission Control Module (TCM) is disconnected from battery power B+ or ground. It will also be set during the DRBIII(R) Quick Battery Disconnect procedure.
Theory of operation: A battery backed RAM (Random Access Memory) is used to maintain some learned values. When the battery B+ is disconnected, the memory is lost. When the B+ is restored, this memory loss is detected by the TCM. The DTC is set and the learned values are initialized to known constants or previously learned values from EEPROM (Electronic Erasable Programmable Read Only Memory). This results in the reinitialization of some parameters.
Transmission Effects: Loss of DTC data. The Transmission system will default to the Immediate shutdown routine if power is lost while operating the vehicle. Normal operation is resumed if the power is restored during the same key start.
Possible causes:
^ Battery voltage removed from TCM (Fused B+)
^ TCM disconnected
^ Dead Battery
^ Low battery voltage during cranking
^ Quick Battery Disconnect by DRBIII(R) or MDS2
^ Bad TCM ground circuit.

Name of DTC: P-1767(14) - Relay Always On
When monitored: When ignition key is turned from "off" position to "run" position and/or ignition key is turned from "crank" position to "run" position.
Set condition: This DTC is set if the Transmission Control Module (TCM) senses greater than 3 volts at the Trans Control Relay Output terminal(s) Of the TCM prior to the TCM energizing the relay.
Theory of operation: The transmission control relay is used to supply power to the solenoids and pressure switches when the transmission is in normal operating mode. The relay output is fed back to the TCM through pins 16, 17, and 36. It is referred to as "Transmission Control Relay Output". This circuit does not supply power to the TCM, it is only a sense circuit. When the relay is off, no power is supplied to the solenoids and pressure switches, and the transmission is in "limp-in" or "default" mode.
Transmission Effects: The MIL will illuminate and the transmission system will default to the Immediate Shutdown routine.
Possible causes:
^ Transmission Control Relay contacts stuck together
^ Short to voltage in Transmission Control Relay output circuit(s)
^ Short to voltage in Transmission Relay Control circuit
^ Short to voltage on any pressure switch sense circuit
^ Short to voltage on any solenoid control circuit
^ TCM connector problems
^ TCM

Name of DTC: P-1768(15) - Relay Output Always Off
When monitored: Continuously
Set condition: This DTC is set when less than 3 volts are present at the transmission control relay output (pins 16,17 and 36) circuits at the Transmission Control Module (TCM) when the TCM is energizing the relay.
Theory of operation: The Transmission Control Relay is used to supply power to the solenoids and pressure switches when the transmission is in normal operating mode. The relay output is fed back to the TCM through pins 16, 17, and 36. It is referred to as "Transmission Control Relay Output". This circuit does not supply power to the TCM, it is only a sense circuit. When the relay is off, no power is supplied to the solenoids and pressure switches, and the transmission is in "limp-in" or "default" mode.
After a controller reset (ignition key turned to the "run" position or after cranking engine), the controller energizes the relay. Prior to this the TCM verifies that the contacts are open by checking for no voltage at the switched battery terminals. After the relay is energized, the TCM monitors the terminals to verify that the voltage is greater than 3 volts.
Transmission Effects: The MIL will illuminate and the transmission system will default to the Immediate Shutdown routine.
Possible causes:
^ Relay (intermittent relay function caused by oxidized or contaminated relay contacts)
^ Short to ground or open circuit in the transmission control relay output circuit(s)
^ TCM connector problem
^ Relay connector problem
^ Relay Ground circuit
^ TCM Ground circuit(s)
^ TCM

Name of DTC: P-0725(18) - Engine Speed Sensor Circuit
When monitored: Continuously with engine running.
Set condition: This DTC is set when the engine speed sensed by the Transmission Control Module (TCM) is less than 390 RPM or greater than 8000 RPM for more that 2.0 seconds.
Theory of operation: The TCM uses the crank sensor signal to calculate engine RPM. The TCM uses the RPM data broadcast over the communication bus to determine if the engine is running. The TCM continuously verifies that its calculated engine speed is within range while the engine is running.
Transmission Effects: The MIL will illuminate and the transmission system will default to the Logical Shutdown routine.
Possible causes:
^ Open or short in engine speed sensor circuit. (Crank sensor signal)
^ TCM connector problems (Crank sensor signal or sensor ground terminals) Open or short in sensor ground circuit
^ TCM
^ PCM

Name of DTC: P-1716(19) - Bus Communication with Engine Module
When monitored: Continuously with key on.
Set condition: If no bus messages are received from the Powertrain Control Module (PCM) for 10 seconds.
Theory of operation: The TCM communicates with the PCM using the communication bus. It relies on certain information to function properly.
The TCM continuously monitors the bus to check for messages broadcast from the PCM.
Transmission Effects: Delayed 3-4 shifts. No EMCC and early 3-4 shifts for a few minutes after engine is started. Generally poor shift quality.
Possible causes:
^ Open or shorted bus circuit(s)
^ TCM
^ PCM

Name of DTC: P-0705(28) - Check Shifter Signal
When Monitored: Continuously with the key on.
Set Condition: 3 occurrences in one ignition start of an invalid PRNDL DTC that lasts for more than 0.1 second.
Theory of Operation: The TRS T1, TRS T2, TRS T3, TRS T41, and TRS T42 sense circuits communicate the shift lever position to the TCM. Each circuit is terminated at the transmission with a switch. Each switch can be either open or closed, depending on the shift lever position. The TCM can decode this information and determine the shift lever position. Each shift lever position has it own unique combination of closed and open switches.
This is called a PRNDL DTC. There are 5 switches, therefore: there are many possible combinations of open and closed switches (DTC'S). There are 12 valid DTC'S, two for neutral, one for each other gear position (5), and five temporary DTC's. The remainder of the DTC's should never occur, these are called invalid DTC's.

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