207 lines
10 KiB
Markdown
207 lines
10 KiB
Markdown
# NAG1 722.6
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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 CODE|J2012 DTC|A580 DTC|DESCRIPTION OF FAULT|LIMP-IN SET|MIL LIT|TYPE OF 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 Solenoid Circuit |Yes (P)| Yes |C, E, S|
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|7| P0778 |2108 |Shift Pressure Solenoid Circuit| 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 Low Yes (P) |Yes| C, E, S |
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|78 |P0643| Sensor Supply Voltage High |Yes (P)| Yes |C, E, S |
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|12| P0717 |2200 |N2 Input Speed Sensor Circuit |Yes (T)| Yes| C, E, S |
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|13| P2767 |2203 |N3 Input Speed Sensor Circuit |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. Sensor Shorted |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 Speed Signal Not Valid |No| No| C, E, S |
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|23| U140B| 2401| CAN Left Rear Wheel Speed Signal Not Valid |No| No| C, E, S|
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|24 |U140A| 2402 |CAN Right Front Wheel Speed Signal Not Valid |No| No| C, E, S |
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|25 |U1409 |2403| CAN Left Front Wheel Speed Signal Not Valid |No| No |C, E, S |
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|---| P0501 |---|Vehicle Speed Sensor Performance/Rationality |Yes (T)| Yes| C, E, S |
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|26| U1400| 2405| CAN Engine TPS Message Not Valid |No| No| C, E, S |
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|27 |U1404 |2406 |CAN Static Engine Torque Message Not Valid |No| No| C, E |
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|28 |U1401| 240A| CAN Engine Speed Message Not Valid |No| No| C, E, S |
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|29 |U1405| 2408| CAN Minimum Engine Torque Message Not Valid |No| No| C, E |
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|30| U0141 |2314 |Lost Communication with Central Gateway |No| No| C, E |
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|31| U1406| 2409| CAN Maximum Engine Torque Message Not Valid |No| No |C, E |
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|32 |U1407 |2407 |CAN Engine Torque Demand Message Not Valid |No |No| C, E |
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|33 |U1408| 2404| CAN ABS Brake Light Switch Message Not Valid |No| No |C, E|
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|34| U0103| 2313| Lost Communication with Electric Gearshift Module |Yes (T) |Yes |C, E |
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|35 |U0155| 2315| Lost Communication with Instrument Panel |No |No| C, E |
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|36| U110B |2312 |CAN| Engine Coolant Message Missing |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 Missing |Yes (T)| Yes| C, E |
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|39 |U0100 |2311 |Engine CAN Messages Missing |No| Yes| C, E |
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|40 |U0164| 2316| Lost Communication with A/C Control Module |No| No| C, E|
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|41 |U0114| 2317| Lost Communication with CAN Transfer Case |Yes (T)| Yes| C, E|
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|42| U0404 |240C| CAN Gearshift Position Message Not Valid |Yes (T) |Yes| C, E |
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|43| U1402 |240B| CAN Engine Coolant Temperature Message Not Valid |No| No| C, E, S |
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|44| U0414 |240D| CAN Transfer Case Message Not Valid |Yes (T) |Yes| C, E |
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|48| P0602 |2010| Internal Controller Variant Not Coded |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 First Gear| Yes (C)| Yes |C, T |
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|100 |P0732|---| Transmission Slipping in Second Gear |Yes (C)| Yes| C, T |
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|101| P0733|---| Transmission Slipping in Third Gear |Yes (C) |Yes |C, T |
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|102 |P0734 |---|Transmission Slipping in Fourth Gear |Yes (C)| Yes| C, T |
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|103 |P0735|---| Transmission Slipping in Fifth Gear |Yes (C)| Yes| C, T|
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|52| P0742| 2510| TCC Stuck On (Mechanical) |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 Acknowledge Not Correct| 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 Supply/Watchdog |Yes (P)| Yes| C|
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|57| P1631* |2004 |Internal Controller Clock Failure |Yes (P)| Yes| C|
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|58 |P1632* |2000 |Internal Controller Test Internal Watchdog Failure| Yes (P)| Yes C |
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|59 |P1633*| 2002 |Internal Controller Test External Watchdog Failure| Yes (P)| Yes |C |
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|60| P1634*| 2001 Internal Controller Internal Watchdog Occurred| No| Yes| C |
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|61| P1636*| 2003 |Internal Controller External Watchdog Occurred |No| Yes| C |
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|62 |P0604 |2005| Internal Controller RAM Failure |Yes (P)| Yes |C |
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|63 |P0605 |2008 |Internal Controller ROM Failure |Yes (P)| Yes| C |
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|65 |P1637| 200A| Internal Controller EEROM Failure |No| No| C|
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|66 |P1638/*| 2006| Internal Controller CAN 1 RAM Failure |Yes (P)| Yes| C |
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|67 |P1639/* |2007 |Internal Controller CAN 2 RAM Failure |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 Switch Circuit |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 Incorrect Message Length |Yes (T)| Yes| C, E
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|81| U0415| 2330| ABS Controller Incorrect Message Length |Yes (T) |Yes |C, E |
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|82 |U0401| 2331 |Engine Controller Incorrect Message Length |No| Yes| C, E |
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|83| U1507| 2335 |Engine Coolant Temperature Incorrect Message Length |No| No| C, E |
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|84 |U0431| 2334 |Central Gateway Incorrect Message Length |No |No |C, E |
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|85 |U0423 |2332| Instrument Panel Incorrect Message Length |No| No| C, E |
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|86 |U0424| 2336 |A/C Controller Incorrect Message Length |No| No |C, E |
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|87| U1506 |2337 |Transfer Case Controller Incorrect Message Length |Yes (T) |Yes |C, E |
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|111 |U140F|---| CAN Engine Variant Message Not Valid or Missing| Yes (P)| Yes C, E |
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|112| U1410 |---|CAN FCM Variant Message Not Valid or Missing |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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