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Home >> Dodge or Ram Truck >> 2002 >> Grand Caravan FWD V6-3.8L VIN L >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Description and Operation >> Diagnostic Trouble Codes >> DTC Descriptions >> Part 3 of 3 >> Part 3B

Part 3B


Code P0734(54) - Excludes geartrain failures which should be obvious upon disassembly
- If code P0944(35) is also set, follow diagnostic procedure for code P0944(35) first
- Failed or slipping OD clutch - may also set code P0733(53)
- OD and Reverse inner and outer lip seal leakage (usually hard code)
- Sticky OD accumulator seals (intermittent)
- Worn reaction shaft support seal rings (hard code at heavy throttle)
- Broken OD/UD tapered snap ring - (hard code at heavy throttle)
- Failed or slipping 2-4 clutch - may also set code P0732(52)
- 2/4 seal leakage (intermittent)
- Sticky accumulator seals (intermittent)

Codes P0715(56) and P0720(57)
- Failed input or output speed sensor (intermittent or hard code)
- Shorted or open wiring between TCM and speed sensor(s) (intermittent)
- Connector problems at 60 TCM connector and/or speed sensor connector

Code P1794(58)
- Open or shorted speed sensor ground (speed sensor ground is different from chassis ground)
- Open or shorted Temperature Sensor wiring to TRS
- TRS - will also set code P1799(74)
- TCM

NAME OF CODE: P0951(70) - AutoStick Sensor Circuit (If equipped)

When Monitored: Whenever the engine is running.

Set condition:
1. The transmission shift lever is not in AutoStick and either the upshift or downshift switches are closed.
2. Upshift and downshift switches are closed at the same time.

Theory of Operation: In the AutoStick Mode (manual shift mode), upshifts and downshifts are actuated manually. Shift requests are detected by monitoring the MUXED or the upshift and downshift switches. The Transmission Control Module (TCM) monitors the above set conditions. A set condition will be tolerated for up to 15 seconds before setting a code.

Transmission Effects: The OD position shift schedule is substituted while operating in the AutoStick gear selector position. No Limp-in mode occurs.

Possible Causes:
- Wiring or connector problems
- AutoStick switch failure
- TCM

NAME OF CODE: P1797(71) - Manual Shift Overheat

When Monitored: Whenever the engine is running.

Set condition:
1. If the engine temperature exceeds 124 °C (225 °F) while operating in AutoStick mode.
2. If the transmission temperature exceeds 135 °C (275 °F) while in AutoStick mode

Theory of Operation: Transmission and engine temperatures are monitored during vehicle operation. If conditions occur causing the engine or transmission to overheat, the AutoStick mode will be canceled, and a code will be set.

Transmission Effects: The 3 position shift schedule that is used in non-AutoStick applications is substituted while operating in the AutoStick gear selector position. No Limpin mode occurs.

Possible Causes:
- Engine overheat - refer to service manual for diagnosis and repair
- Transmission Overheat
- Restricted transmission cooling system
- Transmission fluid overfilled
- Radiator fan not functioning properly
- Extended driving in low gear

NOTE: Strenuous driving conditions may cause the vehicle to overheat. If the driver operates in or initiates autostick with an overheated vehicle, the code will be set.

NAME OF CODE: P0897(73) - Worn Out/Burnt Transaxle Fluid

When Monitored: At every Fully Electronically Modulated Converter Clutch (FEMCC) to Partial Electronically Modulated Converter Clutch (PEMCC) transition miles when A/C compressor clutch is being cycled.

Set Condition: The code will be set if vehicle shudder is detected 20 times when the A/C clutch is cycled.

Theory of Operation: While in 3rd or 4th FEMCC and just before the A/C clutch engages, the Powertrain Control Module (PCM) requests the Transmission Control Module (TCM) to momentarily establish PEMCC operation. If vehicle shudder is detected during the FEMCC to PEMCC transition, a counter is incremented. If the count reaches 20, the trouble code is set. The driver may then notice harsh bumps when the A/C clutch is being cycled, but vehicle shudder will be eliminated. After 35 OBDII (EURO STAGE III OBD) warm-up starts or if the code is cleared, PEMCC will be reactivated to see if shudder is still present. If one shudder event occurs, the code will be reset. Clearing the code and running battery disconnect with the DRBIII is the only way to reset the shudder counter from 20 back to zero.

Transmission Effects: This code does not cause the transmission to go into Limp-in mode. However, once the code is set, FEMCC to PEMCC operation before the A/C clutch engagement will be disabled for 35 OBDII (EURO STAGE III OBD) warm up starts.

Possible Causes:
- Degraded transmission fluid
- Wheels severely out of alignment
- Internal torque converter problem

NAME OF CODE: P1799(74) - Calculated Oil Temperature in Use

When Monitored: Whenever the Engine is running.

Set Condition: The code is set if any of the following conditions exist for three consecutive key starts:

- The Temperature Sensor voltage is out of range (below 0.07 volts or greater than 4.94 volts)
- If the TCM senses continuous erratic Temperature Sensor voltage.
- The Temperature Sensor temperature stays below 27 °C (80 °F) for an extended period of time.

Theory of Operation: The TCM uses a Temperature Sensor to monitor the transmission sump temperature. This temperature is used to determine which shift schedule the TCM is to use. (See Transmission Operation and Shift Scheduling at Various Sump Temperatures in this diagnostic manual) If the Temperature Sensor circuit fails to operate properly the TCM will use the calculated oil temperature routine found in prior model year TCM. If this occurs for three consecutive key starts, the code will be set. The TCM will then test the Temperature Sensor circuit after ever 35 OBDII (EURO STAGE III OBD) warm-up starts. If the Temperature Sensor circuit is OK, the Temperature Sensor data is used in place of the Calculated Oil temperature data.

Transmission Effects: If the Transmission Temperature Sensor indicates a temperature below -18 ° C (0 °F) or above 115 °C (240 °F) at start up, The TCM compares the calculated oil temperature to the indicated Temperature Sensor oil temperature. If the calculated oil temperature differs significantly from the Temperature Sensor value, the calculated oil temperature will be used for that key start.

Possible Causes:
- Wiring or Connector problems in the transmission temperature sensor signal circuit.
- TRS
- TCM

NAME OF CODE: P0218(75) - High Temperature Operation Activated.

When Monitored: Whenever the engine is running.

Set Condition: Immediately once the Overheat Shift Schedule is activated.

Theory of Operation: If the transmission oil temperature rises above 115 °C (240 °F), the overheat shift schedule is activated refer to Transmission Operation as a function of Transmission Oil Temperature and the code is set. The DTC is an information code only and is being set to aid the technician in determining root cause of a customer driveability issue. The code is also intended to alert the technician to determine if a cooling system malfunction has occurred or if an additional transmission air to oil cooler should be added to the vehicle if the customer regularly drives in a manner that overheats the transmission. Extended operation above 115 °C (240 °F) will reduce the durability of the transmission and should be avoided. Correcting the cooling system malfunction or installing an additional transmission oil cooler will improve transmission durability especially for customers who operate in city/construction stop and go traffic, tow trailers regularly, drive aggressively in low gear or drive regularly in mountainous areas.

Transmission Effects: Information only code. Overheat shift schedule was activated, no Limp-in condition occurs. 2nd gear partial EMCC above 40 km/h (25 mph), 3rd gear EMCC from 45-69 km/h (28-43 mph), delayed 3-4 upshift at 69 km/h (43 mph), early 4-3 coastdown at 66 km/h (41 mph), EMCC operation under all conditions above 40 km/h (25 mph) except at closed throttle or 1st gear.

Possible Causes:
- Transmission Overfilled with Oil
- Engine cooling fan failure
- Engine thermostat stuck closed
- Radiator corroded or packed with dirt
- Transmission Oil Cooler Plugged
- Customer driving pattern requires additional transmission cooling

NAME OF CODE: P0884(76) - Power-Up at Speed

When Monitored: When TCM (transmission control module) initially powers-up.

Set Condition: If the TCM powers up while in the "Drive" position and. the vehicle is going above 32 km/h (20 mph), the code is set.

Theory of Operation: If a vehicle loses power to the TCM, the vehicle will go to the 2nd gear mode since there is no power available to control the transmission solenoids. However if power is restored, the TCM will power-up and normal operation will be restored. This DTC identifies that power to the TCM was restored when the gear selector was in a "Drive" position while the vehicle was moving at speeds above 32 km/h (20 mph). If someone shifts to Neutral and cycles the ignition key and quickly shifts to "Drive" while moving before the TCM COMES Out of its START ROUTINE, the DTC can be set. Therefore it is critical that this DTC diagnosis repair procedure should only be used if the vehicle is experiencing intermittent 2nd gear operation and subsequently a return to normal operation during normal driving.

Transmission Effects: No Limp-in condition. The DTC is for information only when trying to diagnosis intermittent 2nd gear operation and subsequently a return to normal operation.

Possible Causes:
- No Problem if Vehicle is started in "neutral" at speeds above 32 Km/H (20 mph) and shifted quickly to "Drive" before TCM comes out of the START ROUTINE.

FOR INTERMITTENT 2ND GEAR OPERATION AND THEN A SUBSEQUENT RETURN TO NORMAL OPERATION WITHOUT CYCLING THE IGNITION KEY

- Intermittent Direct Battery connection be tween TCM (60-way pin 56) and battery.
- Intermittent Fused Ignition Switch Output between TCM (60-way pin 11) and ignition switch.
- Intermittent Ground to TCM (60 way pins 53 and 57).

NAME OF CODE: P1687(77) - No Communication with MIC

When Monitored: Continuously with key on.

Set Condition: If no PCI bus messages are received from the Mechanical Instrument Cluster (MIC) for 25 seconds.

Theory of Operation: The TCM communicates with the MIC using the PCI bus. It relies on certain information to function properly. The TCM continuously monitors the PCI bus to check for messages broadcast from the PCM.

Transmission Effects: Possible improper TCM AutoStick configuration.

Possible Causes:
- Open or shorted PCI bus circuit from MIC
- MIC
- TCM (If other communications codes are stored in the TCM only)

NAME OF CODE: P1652(78) - Serial Communication Link Malfunction

When Monitored: Continuously with key on.

Set Condition: If no PCI bus messages are received by the Transmission Control Module (TCM) for 10 seconds.

Theory of Operation: The TCM communicates with the other modules in the vehicle using the PCI bus. It relies on certain information to function properly. The TCM continuously monitors the PCI bus to check for messages broadcast from the certain modules.

Transmission Effects: Possible improper TCM AutoStick configuration and delayed 3-4 shifts. No EMCC and early 3-4 shifts for a few minutes after engine is started.

Possible Causes:
- Open or shorted PCI bus circuit from BCM
6 TCM

NAME OF CODE: P0562(79) Low Battery Voltage

When Monitored: Continuously with engine running and Transmission Relay energized.

Set Condition: If the voltage sensed at the Transmission Control Relay Output circuit (pins 16 and 17 at TCM) for 15 seconds.

Theory of Operation: The Transmission system requires sufficient battery voltage in order to energize the transmission solenoids. The TCM continuously monitors the voltage available to the solenoids.

Transmission Effects: At speeds above 72 km/h (45 mph) the transmission system will default to neutral. Below 72 km/h (45 mph) the transmission system will default to limp-in mode and the MIL will illuminate after 5 minutes of substituted operation. Manual gear selection of Park, Reverse, Neutral and Second will be available.

Possible Causes:
- Charging system problem
- Poor/High resistance connection between TCM and Battery/Alternator
- TCM pin 16 and 17 high resistance or poor connection
- TCM ground pins 53 and 57 high resistance or poor connection
- High resistance in Transmission Control Relay contacts
- TCM
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