Diagnosis and check of automatic transmission 4.0L (Discovery 3)

Review

This section is intended to provide mechanics with methods for diagnosing problems with transmission components instead of replacing the entire assembly.

However, there are a number of situations where replacing the assembly is the only practical solution, and this section will cover the diagnostics required to collect the information required for a transmission replacement to be eligible under the Pre-Approval Warranty Program (WPAP), where applicable, as well as disclosure of DTCs (DTC), stored by the control module.

Basic transmission checks should be done first (liquid condition and level, etc.), and for this it is necessary to use an approved diagnostic system or other equipment with the ability to record data for temperature control, etc.

Information about the operation of the gearbox can be found in the relevant section of the workshop manual.

Inspection and verification

1. Make sure the customer's complaint is valid.

2. Visually inspect for obvious mechanical and electrical problems.

Mechanical factors	Electrical Factors
Fluid condition Liquid level Brake fluid leaks Working fluid heat exchanger External linkages Gear selector	Fuses Wiring harnesses electrical connector (s) transmission control module (TCM) Engine control module (ECM) CAN electrical circuits (Control Area Network)

3. If an obvious cause of a problem you identified or described by a customer is found, resolve it before proceeding to the next steps (if possible).

4. Use an approved diagnostic system or scan tool (tester), to retrieve all DTCs before accessing the DTC Index (DTC).


Since DTCs are stored in more than one module, a complete vehicle data readout is recommended.

Clear all DTCs after troubleshooting.

Preview

1. Ask the owner/driver about the problem in as much detail as possible to facilitate diagnosis. The time spent doing this will reduce the need to perform an extensive road test and the possibility of possible diagnostic misses.

The information required for WPAP is still useful as an aid in performing diagnostics, even when the system is not in operation.

Required information for WPAP (if applicable)

• Nature of the fault (loss of transmission, slippage, intense vibration, shift quality, noise, etc.)
• The frequency with which the malfunction occurs
• Conditions under which the malfunction occurs, including temperature (coolant and external), gear selected, driving speed, engine speed and any specific conditions
• Check for and correct for non-transmission DTCs before proceeding with transmission diagnosis.

2. Write down detailed information about the car, including:

• Service Information
• Transmission serial number
• Gearbox software option

3. Visually inspect the transmission for transmission fluid leaks, damage, etc.

4. Check the condition of the transmission fluid.

NOTE: The condition of the transmission fluid is a good indication of the internal condition of the transmission. If the fluid shows signs of overheating and/or is contaminated, this usually indicates that internal damage to the transmission is such that the best course of action is to replace the unit. Compare the fluid drained from the transmission for color and smell with fresh fluid.

5. Check the transmission fluid level. Refer to the relevant section in the workshop manual.

NOTE: This is important to the operation of the transmission and the procedure must be followed exactly to avoid inaccuracies in the diagnosis, resulting in a possible warranty claim.

6. Check idle speed and throttle sensor using an approved diagnostic system or scan tool.

7. Check up adjustment of a cable of the selector of a choice of transfers. Refer to the relevant section in the workshop manual.

8. Check transmission range sensor adjustment.

A comprehensive transmission range sensor adjustment procedure is available using the approved diagnostic system.

If any problems are found and then corrected in the above sequence, clear all DTCs and verify that the vehicle is operating correctly.

If a fault is found that indicates the need to replace the transmission, a warranty pre-approval program should be requested prior to work (if applicable).

DTC index

NOTE: Universal Scan Tools cannot read the listed codes or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7 digit code to identify the problem (the last 2 digits give additional information read by the diagnostic system approved by the manufacturer).

DTC	Description	Possible reasons	Action
P012100	Throttle/Accelerator Position Sensor A Circuit Range/Performance Problems	Throttle position sensor wiring high resistance Throttle Position Sensor Signal Circuits (throttle position 1 or throttle position 2): short circuit to battery + Throttle Position Sensor Malfunction Operating Range/Kickdown Performance Issues with Partial Accelerator Pedal Depression	Check for DTCs related to the pedal position sensor. Configure the module using an approved diagnostic system.
P021900	Engine overspeed condition	Uncharacteristic engine speed	Check for DTCs related to engine management.
P050000	Vehicle speed sensor A	Vehicle speed signal not registered	Check for ABS DTCs Check the CAN circuits. Refer to the electrical manual.
P050100	Vehicle Speed Sensor A Range/Performance Problems	Operating Range/Performance Issues	Check for DTCs related to the input/output sensor. Check the CAN circuits. Refer to the electrical manual.
P056100	Unstable voltage in the system	Supply voltage out of operating range with engine running	Check battery and charging system. Refer to the relevant section in the workshop manual.
P056200	Low voltage in the system	Very low supply voltage to TCM	Check the condition and charge of the battery. Check TCM power circuits. Refer to the electrical manual.
P056300	High voltage in the system	The supply voltage is too high with the engine running and there was no start from an external battery and the gearbox was not working in emergency mode	Check battery and charging system. Refer to the relevant section in the workshop manual. Check if the vehicle has been started from an external battery using the connecting wires.
P060100	Internal control module memory checksum error	Checksum error	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P060300	Persistent Memory Error (KAM) internal control module	Persistent Memory Error (KAM)	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P060500	Read Only Memory Error (ROM) internal control module	Read Only Memory Error (ROM)	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P061300	TCM processor	CPU	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P062F00	EEPROM error of the internal control module	eeprom error	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P064200	Low reference voltage in sensor circuit A	Reference voltage circuit short circuit to ground Reference voltage circuit high resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P064300	High reference voltage in sensor circuit A	Reference voltage circuit short circuit to battery	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P065700	Break in the electrical circuit of the supply voltage A of the actuator	Supply voltage circuit: high resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P065800	Low voltage in the electrical circuit of the supply voltage A of the actuator	Supply voltage circuit short circuit to ground	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P065900	High voltage in the electric circuit of the supply voltage A of the actuator	Supply voltage circuit short circuit to battery	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P066800	PCM / ECM / TCM Internal Temperature Sensor Circuit A Low Voltage	Temperature sensor circuit high resistance Temperature sensor circuit short circuit to ground	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P066900	PCM / ECM / TCM Internal Temperature Sensor Circuit A High Voltage	Temperature sensor circuit short circuit to battery	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P070500	Transmission range sensor A circuit (input signal PRNDl)	Uncharacteristic signal	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P071000	Transmission Fluid Temperature Sensor A Circuit	Temperature rise too low	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P071100	Transmission Fluid Temperature Sensor A Circuit Range/Performance Problems	Sensor circuits short to each other	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P071200	Transmission fluid temperature sensor A circuit low	Sensor circuit high resistance Sensor Circuit Short to Ground	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P071300	High voltage in the electrical circuit of the transmission fluid temperature sensor A	Sensor Circuit Short to Battery	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P071600	Turbine Speed/Input Shaft Speed Sensor A Circuit Range/Performance Problems	Sensor circuit high resistance Sensor Circuit Short to Ground	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P071700	No signal in the electrical circuit of the sensor A turbine speed / input shaft	Sensor Circuit Short to Battery	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P072000	Output Speed Sensor Circuit	Sensor Circuit Short to Battery Sensor circuit high resistance Sensor Circuit Short to Ground	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P072122	Output Speed Sensor Electrical Range/Performance Problems	Range/Performance Issues Signal Amplitude	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P072127	Output Speed Sensor Electrical Range/Performance Problems	Operating Range/Performance Issues Rate of change of signal above threshold	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P072164	Output Speed Sensor Electrical Range/Performance Problems	Operating Range/Performance Issues Lack of signal plausibility	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P072900	Incorrect gear ratio 6	Wrong gear ratio Slip too high between input and output speeds	Check for DTCs related to the speed sensor Check the sensor circuits. Refer to the electrical manual.
P073000	Wrong gear ratio	Slip too high between input and output speeds	Check for DTCs related to the speed sensor Check the sensor circuits. Refer to the electrical manual.
P073100	Wrong gear ratio 1	Wrong gear ratio Slip too high between input and output speeds	Check for DTCs related to the speed sensor Check the sensor circuits. Refer to the electrical manual.
P073200	Incorrect gear ratio 2	Wrong gear ratio Slip too high between input and output speeds	Check for DTCs related to the speed sensor Check the sensor circuits. Refer to the electrical manual.
P073300	Wrong gear ratio 3	Wrong gear ratio Slip too high between input and output speeds	Check for DTCs related to the speed sensor Check the sensor circuits. Refer to the electrical manual.
P073400	Incorrect gear ratio 4	Wrong gear ratio Slip too high between input and output speeds	Check for DTCs related to the speed sensor Check the sensor circuits. Refer to the electrical manual.
P073500	Wrong gear ratio 5	Wrong gear ratio Slip too high between input and output speeds	Check for DTCs related to the speed sensor Check the sensor circuits. Refer to the electrical manual.
P073600	Incorrect reverse gear ratio	Wrong gear ratio Slip too high between input and output speeds	Check for DTCs related to the speed sensor Check the sensor circuits. Refer to the electrical manual.
P074000	Torque Converter Clutch Solenoid Valve Circuit Open	Solenoid valve circuit high resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P074100	Performance Issues/Stuck Off Torque Converter Clutch Solenoid Circuit	Solenoid Valve Circuit Stuck Off	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P074800	Electrical fault in pressure control solenoid valve A	Too high/low current in the solenoid valve	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P075113	Problems with the characteristics/ jamming in the off state of the electromagnetic gearshift valve A	Performance issues Jamming in the off state Solenoid valve circuit high resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P075114	Problems with the characteristics/ jamming in the off state of the electromagnetic gearshift valve A	Performance issues Jamming in the off state Solenoid valve circuit high resistance Solenoid valve circuit short circuit to ground	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P075200	Jamming in the switched-on state of the electromagnetic gearshift valve A	Jamming in the on state	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P075300	Shift Solenoid A Electrical Malfunction	Solenoid valve circuit short to battery	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P077800	Electrical fault in pressure control solenoid valve B	Too high current in the solenoid valve	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P078000	Shift Malfunction	Ratio between input and output speeds too high during gear changes Clutch does not open or close	Check fluid level and condition. Check for relevant DTCs.
P078123	Switch 1-2	Ratio between input and output shaft speeds too high during gear changes Clutch does not open	Check fluid level and condition. Check for relevant DTCs.
P078162	Switch 1-2	Ratio between input and output speeds too high during gear changes Clutch does not open or close	Check fluid level and condition. Check for relevant DTCs.
P078164	Switch 1-2	Ratio between input and output speeds too high during gear changes Clutch does not open or close	Check fluid level and condition. Check for relevant DTCs.
P078262	Switch 2-3	Ratio between input and output speeds too high during gear changes Clutch does not open or close	Check fluid level and condition. Check for relevant DTCs.
P078264	Switch 2-3	Ratio between input and output speeds too high during gear changes Clutch does not open or close	Check fluid level and condition. Check for relevant DTCs.
P078323	Switch 3-4	Ratio between input and output shaft speeds too high during gear changes Clutch does not open	Check fluid level and condition. Check for relevant DTCs.
P078362	Switch 3-4	Ratio between input and output speeds too high during gear changes Clutch does not open or close	Check fluid level and condition. Check for relevant DTCs.
P078364	Switch 3-4	Ratio between input and output speeds too high during gear changes Clutch does not open or close	Check fluid level and condition. Check for relevant DTCs.
P078423	Switching 4-5	Ratio between input and output shaft speeds too high during gear changes Clutch does not open	Check fluid level and condition. Check for relevant DTCs.
P078462	Switching 4-5	Ratio between input and output speeds too high during gear changes Clutch does not open or close	Check fluid level and condition. Check for relevant DTCs.
P078464	Switching 4-5	Ratio between input and output speeds too high during gear changes Clutch does not open or close	Check fluid level and condition. Check for relevant DTCs.
P079800	Electrical failure of pressure control solenoid valve C	Too high current in the solenoid valve	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P081C00	Park Position Input Circuit	Parking position lock signal failure	Check the gear selector input circuits. Refer to the electrical manual.
P082600	Upshift and downshift electrical circuit	Invalid signal	Check upshift and downshift electrical circuits. Refer to the electrical manual.
P082923	Switching 5-6	Ratio between input and output shaft speeds too high during gear changes Clutch does not open	Check fluid level and condition. Check for relevant DTCs.
P082962	Switching 5-6	Ratio between input and output speeds too high during gear changes Clutch does not open or close	Check fluid level and condition. Check for relevant DTCs.
P082964	Switching 5-6	Ratio between input and output speeds too high during gear changes Clutch does not open or close	Check fluid level and condition. Check for relevant DTCs.
P085000	Park/Neutral Position Sensor-Switch Input Circuit	Starter Interlock Signal Failure	Check starter interlock electrical circuits. Refer to the electrical manual.
P089700	Deterioration of the transmission fluid	Temperature too high for too long a period of time	Change fluid.
P092800	Open circuit A of the electromagnet / gearshift lock actuator	Solenoid valve circuit high resistance	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P092900	Solenoid/Shift Lock Actuator Operating Range/Performance Circuit A Problems	Solenoid valve circuit short circuit to ground Solenoid valve circuit high resistance	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P093000	Low voltage in the electric circuit A of the solenoid / shift lock actuator	Solenoid valve circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P093100	High voltage in the electric circuit A of the solenoid / shift lock actuator	Solenoid valve circuit short to battery	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P093800	Hydraulic Fluid Temperature Sensor Operating Range/Performance Issues	Operating Range/Performance Problems No signal characteristic	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P096013	Break in the electrical control circuit of the pressure control solenoid valve A	Control Circuit High Resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system.
P096014	Break in the electrical control circuit of the pressure control solenoid valve A	Control Circuit High Resistance Control circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P096200	Pressure Control Solenoid A Control Circuit Low Voltage	Control circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P096300	High voltage in the control circuit of the pressure control solenoid valve A	Control circuit short circuit to battery	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P096413	Break in the electrical control circuit of the pressure control solenoid valve B	Control Circuit High Resistance	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P096414	Break in the electrical control circuit of the pressure control solenoid valve B	Control Circuit High Resistance Control circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P096600	Pressure Control Solenoid Valve Control Circuit Low Voltage B	Control circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P096700	High voltage in the control circuit of the pressure control solenoid valve B	Control circuit short circuit to battery	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P096813	Rupture of an electric chain of management of the electromagnetic valve of management of pressure With	Control Circuit High Resistance	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P096814	Rupture of an electric chain of management of the electromagnetic valve of management of pressure With	Control Circuit High Resistance Control circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P097000	Low voltage in the control circuit of the pressure control solenoid valve C	Control circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P097100	High voltage in the control circuit of the pressure control solenoid valve C	Control circuit short circuit to battery	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P178300	Transmission overheating condition	Valve block module shutdown detected in last drive cycle	Check fluid level and condition. Check for relevant DTCs.
P271600	Pressure control solenoid valve D electrical fault	Too high current in the solenoid valve	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P271813	Open circuit in pressure control solenoid valve D	Control Circuit High Resistance	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P271814	Open circuit in pressure control solenoid valve D	Control Circuit High Resistance Control circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P272000	Pressure Control Solenoid Control D Circuit Low Voltage	Control circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P272100	Pressure control solenoid D control circuit high voltage	Control circuit short circuit to battery	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P272500	Electrical malfunction of the pressure control solenoid valve E	Too high current in the solenoid valve	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P272713	Break in the electrical control circuit of the pressure control solenoid valve E	Control Circuit High Resistance	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P272714	Break in the electrical control circuit of the pressure control solenoid valve E	Control Circuit High Resistance Control circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P272900	Pressure Control Solenoid E Control Circuit Low Voltage	Control circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P273000	High voltage in the control circuit of the pressure control solenoid valve E	Control circuit short circuit to battery	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P275900	Torque Converter Clutch Pressure Control Solenoid Electrical Malfunction	Pressure control solenoid valve failure	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P276100	Break in the electrical circuit for controlling the torque converter clutch pressure control solenoid valve	Pressure control solenoid valve circuit high resistance	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P276200	Torque Converter Clutch Pressure Control Solenoid Control Circuit Range/Performance Problems	Pressure control solenoid valve circuit current too low	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P276300	Torque Converter Clutch Pressure Control Solenoid Control Circuit High Voltage	Pressure control solenoid valve circuit short to voltage	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
P276400	Torque Converter Clutch Pressure Control Solenoid Control Circuit Low Voltage	Pressure control solenoid valve circuit short circuit to ground	Check the electrical circuits of the solenoid valve. Refer to the electrical manual.
U000188	High speed CAN data bus	Bus disabled	The module generating this code has disabled CAN communication. Check for other bus disable codes. Check module and circuits. Refer to the electrical manual. If a module is suspected, refer to the warranty policy and procedures manual.
U010087	Lost communication with ECM/PCM "A"	No message	Check ECM and electrical circuits. Refer to the electrical manual.
U010287	Lost Communication With Transfer Case Control Module	No message	Check the transfer case control module and circuits. Refer to the electrical manual.
U010487	Lost Communication With Cruise Control Module	No message	Check cruise control module and circuits. Refer to the electrical manual.
U012287	Lost Communication with Vehicle Dynamics Control Module	No message	Check the ABS module and circuits. Refer to the electrical manual.
U012687	Lost Communication With Steering Angle Sensor Module	No message	Check the steering wheel angle sensor and circuits. Refer to the electrical manual.
U012887	Lost Communication With Parking Brake Control Module	No message	Check parking brake control module and circuits. Refer to the electrical manual.
U013887	Lost Communication with Terrain Response System Control Module	No message	Check the terrain response control module and circuits. Refer to the electrical manual.
U015587	Lost Communication with Instrument Cluster Control Module (IPC)	No message	Check instrument panel and electrical circuits. Refer to the electrical manual.
U030055	Internal control module software incompatibility	Module configuration not configured	Configure the module using an approved diagnostic system.
U040186	Invalid data received from ECM/PCM A	Invalid signal	Check the engine speed on the instrument panel. Check for DTCs in the ECM.
U041686	Invalid data received from vehicle dynamics control module	Invalid signal	Check for ABS DTCs
U30004A	control module	Wrong element installed Mismatch between configuration data and read configuration	Configure the module using an approved diagnostic system.