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# CANBUS Inputs
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The TCM CAN bus inputs used by the NAG 1 electronic control system are:
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* ABS Wheel Speed Sensors (two-wheel drive uses rear sensors, four-wheel drive
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uses front and rear sensors)
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* Engine Coolant Temperature
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* Engine Static Torque
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* Driver Input Requested Torque
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* Pedal Position
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* Demanded Engine Torque (Electronic Stability Program [ESP])
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* Engine RPM
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* Brake Light Switch
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* Cruise Control Off Signal
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* Limp-In Mode Message (from PCM on Grand Cherokee and Sprinter)
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* Acknowledge Transmission Torque Request
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* Cluster Ambient Air Temperature
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* Shift Lever Position (from SLA)
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* Winter/Standard Switch (Crossfire)
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* FCM Inputs to TCM
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* — Axle Ratio
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* — Transfer Case
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* — Dynamic Tire Circumference
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* — Model Year
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* — Country Code
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* — Body Style
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* — Odometer
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* — Brake Light Switch
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* — Kickdown Signal
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* — Ignition Switch Status (Key In, Ignition Off Active, Ignition Run, Ignition
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* Start Active)
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The SLA (Shift Lever Assembly) processes the following information:
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* Stop lamp speed control signal (service brake)
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* Shift lever position (internal to module)
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* Request ID
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* Brake pedal depressed
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* Vehicle speed signal from ABS/ESP controller
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* Ignition switch status
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* Odometer
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* VIN message information
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* Network configuration
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* Vehicle information
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The SLA outputs the following signals:
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* SLA Status
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* Response ID
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The following are the output signals the TCM transmits over the CAN bus.
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* Current/Actual/Target Gear (TCM to CAB/PCM)
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* Maximum Engine Torque
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* Minimum/Maximum Transmission Torque
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* Requested Engine Torque
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* Calculated Output Shaft Speed
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* Allow Transmission Torque Request
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* Torque Converter Status (Open, Closed, Slipping, Open Slipping [5%], Closed
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Slipping [95%])
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* Kickdown
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* Transmission Overtemp (to PCM)
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* Transmission in Limp-In Mode (to PCM)
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* OK to Crank (to PCM)
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* Garage Shift Torque Demand
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* Output Shaft Torque (CAB/EPS Option Only)
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* PRNDL Display Request (to FCM and FCM to Cluster, Sprinter is Shifter to
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* Cluster)
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* Transmission Fluid Temperature
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* PRNDL Status (Signal Not Available)
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* Freeze Frame DTC
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* Number of DTCs Stored (Set)
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* MIL On For This DTC
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* Freeze Frame Priority (Value 1–15)
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* MIL Fault Occurred This Trip
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* Store Freeze Frame Now
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* Delete Freeze Frame Now
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# Fault Results
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The TCM continuously checks for electrical problems, mechanical problems and
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some hydraulic problems. When a problem is sensed, the TCM stores a Diagnostic
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Trouble Code (DTC). Some of these codes cause the transmission to go into “Limp-In”
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or “Default” mode.
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The NAG 1 transmission defaults in the current gear position if a DTC is detected.
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Then after a key cycle or if the transmission is placed in Park, the transmission goes
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into Limp-In Mode, which is mechanical second gear. Some DTCs allow the
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transmission to resume normal operation (recover) if the detected problem goes away.
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A Permanent Limp-In DTC recovers when the key is cycled; but if the same DTC is
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detected for three key cycles, the system does not recover and the DTC must be
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cleared from the TCM with a scan tool.
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# Fault Codes
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FAULT
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CODE
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J2012
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DTC
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A580
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DTC
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DESCRIPTION OF
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FAULT
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LIMP-IN
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SET
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MIL
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LIT
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TYPE OF
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FAILURE
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2 P0753 2100 1–2/4–5 Shift Solenoid Yes (P) Yes C, E, S
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3 P0758 2102 2–3 Shift Solenoid Yes (P) Yes C, E, S
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4 P0763 2104 3–4 Shift Solenoid Yes (P) Yes C, E, S
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5 P0743 2106 TCC Solenoid Circuit Yes (P) Yes C, E, S
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6 P0748 2107 Modulating Pressure
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Solenoid Circuit
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Yes (P) Yes C, E, S
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7 P0778 2108 Shift Pressure Solenoid
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Circuit
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Yes (P) Yes C, E, S
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10 P0657 2602 Solenoid Supply Voltage Yes (P) Yes C, E, S
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11 P0642 2603 Sensor Supply Voltage
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Low
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Yes (P) Yes C, E, S
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78 P0643 Sensor Supply Voltage
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High
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Yes (P) Yes C, E, S
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12 P0717 2200 N2 Input Speed Sensor
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Circuit
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Yes (T) Yes C, E, S
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13 P2767 2203 N3 Input Speed Sensor
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Circuit
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Yes (T) Yes C, E, S
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14 P2784 220A Input Sensors Mismatch Yes (T) Yes C, E, S, T
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15 P1704 220B N2 Sensor Overspeed Yes (N) Yes C, T
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99 P1705 N3 Sensor Overspeed Yes (N) Yes C, T
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19 P0563 2601 System Overvoltage Yes (T) Yes C, E
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20 P0712 2220 Transmission Oil Temp.
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Sensor Shorted
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No No C, E, S
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21 P0562 2600 System Undervoltage Yes (T) Yes C, E
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22 U140C 2400 CAN Right Rear Wheel
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Speed Signal Not Valid
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No No C, E, S
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23 U140B 2401 CAN Left Rear Wheel
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Speed Signal Not Valid
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No No C, E, S
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24 U140A 2402 CAN Right Front Wheel
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Speed Signal Not Valid
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No No C, E, S
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25 U1409 2403 CAN Left Front Wheel
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Speed Signal Not Valid
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No No C, E, S
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P0501 Vehicle Speed Sensor
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Performance/Rationality
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Yes (T) Yes C, E, S
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26 U1400 2405 CAN Engine TPS Message
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Not Valid
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No No C, E, S
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27 U1404 2406 CAN Static Engine Torque
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Message Not Valid
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No No C, E
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28 U1401 240A CAN Engine Speed
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Message Not Valid
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No No C, E, S
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29 U1405 2408 CAN Minimum Engine
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Torque Message Not Valid
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No No C, E
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30 U0141 2314 Lost Communication with
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Central Gateway
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No No C, E
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31 U1406 2409 CAN Maximum Engine
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Torque Message Not Valid
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No No C, E
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32 U1407 2407 CAN Engine Torque
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Demand Message Not
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Valid
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No No C, E
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33 U1408 2404 CAN ABS Brake Light
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Switch Message Not Valid
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No No C, E
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34 U0103 2313 Lost Communication with
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Electric Gearshift Module
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Yes (T) Yes C, E
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35 U0155 2315 Lost Communication with
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Instrument Panel
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No No C, E
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36 U110B 2312 CAN Engine Coolant
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Message Missing
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No No C, E
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37 U0002 2300 Bus-Off CAN Controller 1 Yes (T) Yes C, E
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38 U0121 2310 ABS CAN Messages
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Missing
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Yes (T) Yes C, E
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39 U0100 2311 Engine CAN Messages
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Missing
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No Yes C, E
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40 U0164 2316 Lost Communication with
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A/C Control Module
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No No C, E
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41 U0114 2317 Lost Communication with
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CAN Transfer Case
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Yes (T) Yes C, E
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42 U0404 240C CAN Gearshift Position
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Message Not Valid
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Yes (T) Yes C, E
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43 U1402 240B CAN Engine Coolant
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Temperature Message Not
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Valid
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No No C, E, S
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44 U0414 240D CAN Transfer Case
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Message Not Valid
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Yes (T) Yes C, E
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48 P0602 2010 Internal Controller
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Variant Not Coded
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Yes (P) Yes C
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49 P0219 2501 Engine Overspeed Yes (N) Yes C, T
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50 P0730 2500 Improper Gear Ratio Yes (N) Yes C, E, T
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51 P0731 2502 Transmission Slipping in
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First Gear
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Yes (C) Yes C, T
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100 P0732 Transmission Slipping in
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Second Gear
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Yes (C) Yes C, T
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101 P0733 Transmission Slipping in
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Third Gear
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Yes (C) Yes C, T
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102 P0734 Transmission Slipping in
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Fourth Gear
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Yes (C) Yes C, T
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103 P0735 Transmission Slipping in
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Fifth Gear
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Yes (C) Yes C, T
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52 P0742 2510 TCC Stuck On
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(Mechanical)
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No No C, E, S, T
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53 P2783 2511 TCC Overtemp No No T
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54 P2638 2520 Torque Reduction
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Acknowledge Not Correct
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No No C
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55 P1731 2503 Incorrect Gear Engaged Yes (T) Yes C, E, S
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56 P1629* 2013 Solenoid
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Supply/Watchdog
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Yes (P) Yes C
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57 P1631* 2004 Internal Controller Clock
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Failure
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Yes (P) Yes C
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58 P1632* 2000 Internal Controller Test
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Internal Watchdog Failure
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Yes (P) Yes C
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59 P1633* 2002 Internal Controller Test
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External Watchdog
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Failure
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Yes (P) Yes C
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60 P1634* 2001 Internal Controller
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Internal Watchdog
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Occurred
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No Yes C
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61 P1636* 2003 Internal Controller
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External Watchdog
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Occurred
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No Yes C
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62 P0604 2005 Internal Controller RAM
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Failure
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Yes (P) Yes C
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63 P0605 2008 Internal Controller ROM
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Failure
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Yes (P) Yes C
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65 P1637 200A Internal Controller
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EEROM Failure
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No No C
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66 P1638* 2006 Internal Controller CAN 1
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RAM Failure
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Yes (P) Yes C
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67 P1639* 2007 Internal Controller CAN 2
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RAM Failure
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Yes (P) Yes C
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P0613 Internal Controller Failure Yes (P) Yes C
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71 P0752 2101 1–2/4–5 Solenoid Circuit Yes (P) Yes C, E, S
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72 P0757 2103 2–3 Solenoid Circuit Yes (P) Yes C, E, S
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73 P0762 2105 3–4 Solenoid Circuit Yes (P) Yes C, E, S
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74 P0710 2221 Temperature Sensor P/N
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Switch Circuit
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No No C, E, S
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75 P0714 2222 Temp. Sensor Erratic No No C, E, S
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80 U1508 2333 Electric Gearshift Module
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Incorrect Message Length
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Yes (T) Yes C, E
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81 U0415 2330 ABS Controller Incorrect
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Message Length
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Yes (T) Yes C, E
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82 U0401 2331 Engine Controller
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Incorrect Message Length
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No Yes C, E
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83 U1507 2335 Engine Coolant
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Temperature Incorrect
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Message Length
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No No C, E
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84 U0431 2334 Central Gateway Incorrect
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Message Length
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No No C, E
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85 U0423 2332 Instrument Panel
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Incorrect Message Length
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No No C, E
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86 U0424 2336 A/C Controller Incorrect
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Message Length
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No No C, E
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87 U1506 2337 Transfer Case Controller
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Incorrect Message Length
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Yes (T) Yes C, E
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111 U140F CAN Engine Variant
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Message Not Valid or
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Missing
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Yes (P) Yes C, E
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112 U1410 CAN FCM Variant
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Message Not Valid or
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Missing
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Yes (P) Yes C, E
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These faults also set
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code P0613
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(P) = Permanent Limp-In
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(T) = Temporary Limp-In
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(C) = Controlled Limp-In
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(N) = Loss of Drive
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C = Controller
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E = Electrical
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S = Sensor/Actuator
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T = Transmission
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#NORMAL TRANSMISSION OPERATION (SHIFT PATTERNS)
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Normal operation of the transmission is when all upshifts and downshifts occur when
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expected. The shifts should be timely and without harshness. The transmission
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should be able to attain all forward and reverse gear ranges. The initial engagement
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of Drive 1st and/or reverse should be prompt, without delay and smooth. There
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should be no chatter during torque converter clutch operation.
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The following charts provide illustration in graph form of approximately when
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transmission automatic shifting should occur based on % accelerator pedal position
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and transmission calculated output shaft speed (rpm).
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The charts include:
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* 1–2, 2–3, 3–4, 4–5 upshift patterns
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* 5–4, 4–3, 3–2, 2–1 downshift patterns
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* Steady state gear ranges with Open-to-Slipping (O-S) and Slipping-to-Open
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(S-O) torque converter clutch operation patterns
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* Fuel economy patterns
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* Manual gear upshift patterns using Autostick
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