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NAG1 722.6

CANBUS Inputs

The TCM CAN bus inputs used by the NAG 1 electronic control system are:

  • ABS Wheel Speed Sensors (two-wheel drive uses rear sensors, four-wheel drive uses front and rear sensors)
  • Engine Coolant Temperature
  • Engine Static Torque
  • Driver Input Requested Torque
  • Pedal Position
  • Demanded Engine Torque (Electronic Stability Program [ESP])
  • Engine RPM
  • Brake Light Switch
  • Cruise Control Off Signal
  • Limp-In Mode Message (from PCM on Grand Cherokee and Sprinter)
  • Acknowledge Transmission Torque Request
  • Cluster Ambient Air Temperature
  • Shift Lever Position (from SLA)
  • Winter/Standard Switch (Crossfire)
  • FCM Inputs to TCM
  • — Axle Ratio
  • — Transfer Case
  • — Dynamic Tire Circumference
  • — Model Year
  • — Country Code
  • — Body Style
  • — Odometer
  • — Brake Light Switch
  • — Kickdown Signal
  • — Ignition Switch Status (Key In, Ignition Off Active, Ignition Run, Ignition
  • Start Active)

The SLA (Shift Lever Assembly) processes the following information:

  • Stop lamp speed control signal (service brake)
  • Shift lever position (internal to module)
  • Request ID
  • Brake pedal depressed
  • Vehicle speed signal from ABS/ESP controller
  • Ignition switch status
  • Odometer
  • VIN message information
  • Network configuration
  • Vehicle information The SLA outputs the following signals:
  • SLA Status
  • Response ID

The following are the output signals the TCM transmits over the CAN bus.

  • Current/Actual/Target Gear (TCM to CAB/PCM)
  • Maximum Engine Torque
  • Minimum/Maximum Transmission Torque
  • Requested Engine Torque
  • Calculated Output Shaft Speed
  • Allow Transmission Torque Request
  • Torque Converter Status (Open, Closed, Slipping, Open Slipping [5%], Closed Slipping [95%])
  • Kickdown
  • Transmission Overtemp (to PCM)
  • Transmission in Limp-In Mode (to PCM)
  • OK to Crank (to PCM)
  • Garage Shift Torque Demand
  • Output Shaft Torque (CAB/EPS Option Only)
  • PRNDL Display Request (to FCM and FCM to Cluster, Sprinter is Shifter to
  • Cluster)
  • Transmission Fluid Temperature
  • PRNDL Status (Signal Not Available)
  • Freeze Frame DTC
  • Number of DTCs Stored (Set)
  • MIL On For This DTC
  • Freeze Frame Priority (Value 1–15)
  • MIL Fault Occurred This Trip
  • Store Freeze Frame Now
  • Delete Freeze Frame Now

Fault Results

The TCM continuously checks for electrical problems, mechanical problems and some hydraulic problems. When a problem is sensed, the TCM stores a Diagnostic Trouble Code (DTC). Some of these codes cause the transmission to go into “Limp-In” or “Default” mode. The NAG 1 transmission defaults in the current gear position if a DTC is detected. Then after a key cycle or if the transmission is placed in Park, the transmission goes into Limp-In Mode, which is mechanical second gear. Some DTCs allow the transmission to resume normal operation (recover) if the detected problem goes away. A Permanent Limp-In DTC recovers when the key is cycled; but if the same DTC is detected for three key cycles, the system does not recover and the DTC must be cleared from the TCM with a scan tool.

Fault Codes

FAULT CODE J2012 DTC A580 DTC DESCRIPTION OF FAULT LIMP-IN SET MIL LIT TYPE OF FAILURE
2 P0753 2100 1–2/4–5 Shift Solenoid Yes (P) Yes C, E, S
3 P0758 2102 2–3 Shift Solenoid Yes (P) Yes C, E, S
4 P0763 2104 3–4 Shift Solenoid Yes (P) Yes C, E, S
5 P0743 2106 TCC Solenoid Circuit Yes (P) Yes C, E, S
6 P0748 2107 Modulating Pressure Solenoid Circuit Yes (P) Yes C, E, S
7 P0778 2108 Shift Pressure Solenoid Circuit Yes (P) Yes C, E, S
10 P0657 2602 Solenoid Supply Voltage Yes (P) Yes C, E, S
11 P0642 2603 Sensor Supply Voltage Low Yes (P) Yes C, E, S
78 P0643 Sensor Supply Voltage High Yes (P) Yes C, E, S
12 P0717 2200 N2 Input Speed Sensor Circuit Yes (T) Yes C, E, S
13 P2767 2203 N3 Input Speed Sensor Circuit Yes (T) Yes C, E, S
14 P2784 220A Input Sensors Mismatch Yes (T) Yes C, E, S, T
15 P1704 220B N2 Sensor Overspeed Yes (N) Yes C, T
99 P1705 --- N3 Sensor Overspeed Yes (N) Yes C, T
19 P0563 2601 System Overvoltage Yes (T) Yes C, E
20 P0712 2220 Transmission Oil Temp. Sensor Shorted No No C, E, S
21 P0562 2600 System Undervoltage Yes (T) Yes C, E
22 U140C 2400 CAN Right Rear Wheel Speed Signal Not Valid No No C, E, S
23 U140B 2401 CAN Left Rear Wheel Speed Signal Not Valid No No C, E, S
24 U140A 2402 CAN Right Front Wheel Speed Signal Not Valid No No C, E, S
25 U1409 2403 CAN Left Front Wheel Speed Signal Not Valid No No C, E, S
--- P0501 --- Vehicle Speed Sensor Performance/Rationality Yes (T) Yes C, E, S
26 U1400 2405 CAN Engine TPS Message Not Valid No No C, E, S
27 U1404 2406 CAN Static Engine Torque Message Not Valid No No C, E
28 U1401 240A CAN Engine Speed Message Not Valid No No C, E, S
29 U1405 2408 CAN Minimum Engine Torque Message Not Valid No No C, E
30 U0141 2314 Lost Communication with Central Gateway No No C, E
31 U1406 2409 CAN Maximum Engine Torque Message Not Valid No No C, E
32 U1407 2407 CAN Engine Torque Demand Message Not Valid No No C, E
33 U1408 2404 CAN ABS Brake Light Switch Message Not Valid No No C, E
34 U0103 2313 Lost Communication with Electric Gearshift Module Yes (T) Yes C, E
35 U0155 2315 Lost Communication with Instrument Panel No No C, E
36 U110B 2312 CAN Engine Coolant Message Missing No No
37 U0002 2300 Bus-Off CAN Controller 1 Yes (T) Yes C, E
38 U0121 2310 ABS CAN Messages Missing Yes (T) Yes C, E
39 U0100 2311 Engine CAN Messages Missing No Yes C, E
40 U0164 2316 Lost Communication with A/C Control Module No No C, E
41 U0114 2317 Lost Communication with CAN Transfer Case Yes (T) Yes C, E
42 U0404 240C CAN Gearshift Position Message Not Valid Yes (T) Yes C, E
43 U1402 240B CAN Engine Coolant Temperature Message Not Valid No No C, E, S
44 U0414 240D CAN Transfer Case Message Not Valid Yes (T) Yes C, E
48 P0602 2010 Internal Controller Variant Not Coded Yes (P) Yes C
49 P0219 2501 Engine Overspeed Yes (N) Yes C, T
50 P0730 2500 Improper Gear Ratio Yes (N) Yes C, E, T
51 P0731 2502 Transmission Slipping in First Gear Yes (C) Yes C, T
100 P0732 --- Transmission Slipping in Second Gear Yes (C) Yes C, T
101 P0733 --- Transmission Slipping in Third Gear Yes (C) Yes C, T
102 P0734 --- Transmission Slipping in Fourth Gear Yes (C) Yes C, T
103 P0735 --- Transmission Slipping in Fifth Gear Yes (C) Yes C, T
52 P0742 2510 TCC Stuck On (Mechanical) No No C, E, S, T
53 P2783 2511 TCC Overtemp No No T
54 P2638 2520 Torque Reduction Acknowledge Not Correct No No C
55 P1731 2503 Incorrect Gear Engaged Yes (T) Yes C, E, S
56 P1629* 2013 Solenoid Supply/Watchdog Yes (P) Yes C
57 P1631* 2004 Internal Controller Clock Failure Yes (P) Yes C
58 P1632* 2000 Internal Controller Test Internal Watchdog Failure Yes (P) Yes C
59 P1633* 2002 Internal Controller Test External Watchdog Failure Yes (P) Yes C
60 P1634* 2001 Internal Controller Internal Watchdog Occurred No Yes C
61 P1636* 2003 Internal Controller External Watchdog Occurred No Yes C
62 P0604 2005 Internal Controller RAM Failure Yes (P) Yes C
63 P0605 2008 Internal Controller ROM Failure Yes (P) Yes C
65 P1637 200A Internal Controller EEROM Failure No No C
66 P1638/* 2006 Internal Controller CAN 1 RAM Failure Yes (P) Yes C
67 P1639/* 2007 Internal Controller CAN 2 RAM Failure Yes (P) Yes C
--- P0613 --- Internal Controller Failure Yes (P) Yes C
71 P0752 2101 1–2/4–5 Solenoid Circuit Yes (P) Yes C, E, S
72 P0757 2103 2–3 Solenoid Circuit Yes (P) Yes C, E, S
73 P0762 2105 3–4 Solenoid Circuit Yes (P) Yes C, E, S
74 P0710 2221 Temperature Sensor P/N Switch Circuit No No C, E, S
75 P0714 2222 Temp. Sensor Erratic No No C, E, S
80 U1508 2333 Electric Gearshift Module Incorrect Message Length Yes (T) Yes C, E
81 U0415 2330 ABS Controller Incorrect Message Length Yes (T) Yes C, E
82 U0401 2331 Engine Controller Incorrect Message Length No Yes C, E
83 U1507 2335 Engine Coolant Temperature Incorrect Message Length No No C, E
84 U0431 2334 Central Gateway Incorrect Message Length No No C, E
85 U0423 2332 Instrument Panel Incorrect Message Length No No C, E
86 U0424 2336 A/C Controller Incorrect Message Length No No C, E
87 U1506 2337 Transfer Case Controller Incorrect Message Length Yes (T) Yes C, E
111 U140F --- CAN Engine Variant Message Not Valid or Missing Yes (P) Yes C, E
112 U1410 --- CAN FCM Variant Message Not Valid or Missing Yes (P) Yes C, E

These faults also set code P0613 (P) = Permanent Limp-In (T) = Temporary Limp-In (C) = Controlled Limp-In (N) = Loss of Drive C = Controller E = Electrical S = Sensor/Actuator T = Transmission

NORMAL TRANSMISSION OPERATION (SHIFT PATTERNS)

Normal operation of the transmission is when all upshifts and downshifts occur when expected. The shifts should be timely and without harshness. The transmission should be able to attain all forward and reverse gear ranges. The initial engagement of Drive 1st and/or reverse should be prompt, without delay and smooth. There should be no chatter during torque converter clutch operation. The following charts provide illustration in graph form of approximately when transmission automatic shifting should occur based on % accelerator pedal position and transmission calculated output shaft speed (rpm). The charts include:

  • 1–2, 2–3, 3–4, 4–5 upshift patterns
  • 5–4, 4–3, 3–2, 2–1 downshift patterns
  • Steady state gear ranges with Open-to-Slipping (O-S) and Slipping-to-Open (S-O) torque converter clutch operation patterns
  • Fuel economy patterns
  • Manual gear upshift patterns using Autostick