Home/Land Rover/Discovery/Land Rover Discovery L318 (2002-2004)/Repair manual/Automatic Transmission Diagnosis - with Codes/SUMMARY

Contents

Wiring diagrams Section: Automatic Transmission Diagnosis - with Codes

APPLICATION

IDENTIFICATION

GENERAL

Torque Converter Housing

Intermediate Plate

Automatic Transmission Housing

Valve Block

Rear Extension Housing

Automatic Transmission Power Flows

ELECTRONIC AUTOMATIC TRANSMISSION ELECTRONIC CONTROL UNIT

GEAR POSITION SWITCH

GEAR RATIOS

GEAR SELECTOR CABLE

GEAR SELECTOR LEVER ASSEMBLY

LOCK-UP SOLENOID VALVE (MV3) & SHIFT CONTROL SOLENOID VALVES (MV1 & MV2)

PRESSURE REGULATOR SOLENOID VALVE

TRANSMISSION FLUID COOLER

DIAGNOSTICS

Controller Area Network

On Board Diagnostic System

COMPENSATION FOR REDUCED ENGINE TORQUE

GEAR SELECTOR LEVER INTERLOCK

HIGH/LOW RANGE

KICKDOWN

MODE SELECT

Sport Mode

Manual Mode

SHIFT CONTROL

TORQUE CONVERTER LOCK-UP

TOWING/STEEP GRADIENTS

COMPONENT LOCATIONS

TROUBLE SHOOTING

PRELIMINARY INSPECTION

SYMPTOM DIAGNOSIS

Abrupt Or Jerky Gear Changes

Harsh Gear Changes, Poor Gear Selection, Gear Slip Or Loss Of Drive Or Intermittent Failure Of Park Lock Function

Large Amount Of Friction Material In Pan Or On Filter Screen

Loss Of Drive Or Slipping Transmission

Transmission Fluid Leaking Out Of Dipstick Tube

Transmission Shifting Erratically

Transmission Slipping On Acceleration, Erratic Upshifts, Vehicle Jerking While Accelerating Or Engine Revs (Flares) On Upshift

TORQUE CONVERTER ROAD TEST

HYDRAULIC PRESSURE TESTS

STALL SPEED TEST

CLUTCH & SERVO AIR CHECKS

TEST PROCEDURE

POWER OR COMMUNICATION LOST TO ELECTRONIC AUTOMATIC TRANSMISSION ELECTRONIC CONTROL UNIT

RETRIEVING DIAGNOSTIC TROUBLE CODES

SYSTEM MONITORS

End Of Line Programming Monitoring

Gear Ratio Functional Check Monitoring

Pressure Regulator Solenoid Monitoring

Shift Solenoids Monitoring

System Interface Monitoring

Torque Converter Clutch Solenoid Monitoring

Transmission Control Module Monitoring

DIAGNOSTIC TROUBLE CODE DEFINITIONS

CLEARING DIAGNOSTIC TROUBLE CODES

SUMMARY

FAULT CODE 01: TRANSMISSION RELAY CONTROL (RELAY STICKS, SHORT CIRCUIT)/SOLENOID VALVES POWER SUPPLY RELAY STICKING OPEN OR SHORT CIRCUIT

FAULT CODE 02: TRANSMISSION RELAY CONTROL (RELAY STICKS, OPEN CIRCUIT)/SOLENOID VALVES POWER SUPPLY RELAY STICKING CLOSED OR OPEN CIRCUIT

FAULT CODE 03: EEPROM COMMUNICATION FAULT/ECU FAULT, EEPROM COMMUNICATION

FAULT CODE 04: EEPROM CHECKSUM FAULT/ECU EEPROM CHECKSUM

FAULT CODE 05: TORQUE CONVERTER LOCK-UP CLUTCH MONITORING/TORQUE CONVERTER LOCK-UP CLUTCH FAULT

FAULT CODE 06: WATCHDOG CHECK, ECU FAULT

FAULT CODE 08: SOLENOID VALVE 1 CHECK (SHORT CIRCUIT TO VOLTAGE)/SHIFT SOLENOID (MV1) SHORT CIRCUIT

FAULT CODE 09: SOLENOID VALVE 2 CHECK (SHORT CIRCUIT TO VOLTAGE)/SHIFT SOLENOID (MV2) SHORT CIRCUIT

FAULT CODE 10: PRESSURE REGULATOR CHECK (SHORT CIRCUIT TO VOLTAGE)/PRESSURE REGULATING SOLENOID (MV4) SHORT CIRCUIT

FAULT CODE 11: CAN MESSAGE MD-REIB INVALID (FFH)/CAN MESSAGE: ENGINE FRICTION INVALID

FAULT CODE 12: MES LINE 1 FAULT/BECM TO MESSAGE CENTER CIRCUIT FAULT

FAULT CODE 13: MES LINE 2 FAULT/BECM TO MESSAGE CENTER CIRCUIT FAULT

FAULT CODE 14: GEAR POSITION SWITCH MONITORING (PERMANENT)/GEAR POSITION SWITCH INCORRECT OUTPUTS

FAULT CODE 15: CAN LEVEL MONITORING

FAULT CODE 16: CAN BUS MONITORING/CAN BUS FAULT

FAULT CODE 17: CAN TIME-OUT MONITORING

FAULT CODE 18: CAN MESSAGE WFPDK (THROTTLE ANGLE) IN INVALID (FFH)/CAN MESSAGE: THROTTLE POSITION INVALID

FAULT CODE 19: CAN MESSAGE T-MOT INVALID (FFH)/CAN MESSAGE: ENGINE TEMPERATURE INVALID

FAULT CODE 20: CAN MESSAGE V3 (ROAD SPEED) INVALID (FFH)/CAN MESSAGE: ROAD SPEED INVALID

FAULT CODE 21: DOWNSHIFT SAFETY MONITORING/DOWNSHIFT SAFETY MONITOR PREVENTED DOWNSHIFT WHICH WOULD HAVE CAUSED ENGINE OVERSPEED

FAULT CODE 22: STALL SPEED MONITORING/TORQUE CONVERTER SLIPPING

FAULT CODE 23: GEAR POSITION SWITCH DURING CRANKING/GEAR POSITION SWITCH INCORRECT OUTPUTS

FAULT CODE 24: BATTERY SUPPLY CHECK/BATTERY SUPPLY BELOW 9 VOLTS WHILE ENGINE IS RUNNING

FAULT CODE 25: SOLENOID VALVE FOR TC (SHORT CIRCUIT TO GROUND, OR OPEN CIRCUIT)/TORQUE CONVERTER LOCK-UP SOLENOID (MV3) OPEN CIRCUIT

FAULT CODE 26: SOLENOID VALVE 1 (LINE SHORT CIRCUIT GROUND, OR OPEN CIRCUIT)/SHIFT SOLENOID (MV1) OPEN CIRCUIT

FAULT CODE 27: SOLENOID VALVE 2 (LINE SHORT CIRCUIT GROUND, OR OPEN CIRCUIT)/SHIFT SOLENOID (MV2) OPEN CIRCUIT

FAULT CODE 28: PRESSURE REGULATOR (LINE SHORT CIRCUIT TO GROUND, OR OPEN CIRCUIT)/PRESSURE REGULATING SOLENOID (MV4) OPEN CIRCUIT

FAULT CODE 29: GEAR RATIO MONITORING, 1ST GEAR/RATIO MONITORING IMPLAUSIBLE 1ST GEAR RATIO

FAULT CODE 30: GEAR RATIO MONITORING, 2ND GEAR/RATIO MONITORING IMPLAUSIBLE 2ND GEAR RATIO

FAULT CODE 31: GEAR RATIO MONITORING, 3RD GEAR/RATIO MONITORING IMPLAUSIBLE 3RD GEAR RATIO

FAULT CODE 32: GEAR RATIO MONITORING, 4TH GEAR/RATIO MONITORING IMPLAUSIBLE 4TH GEAR RATIO

FAULT CODE 33: CAN MESSAGE MD-IND INVALID, INDICATED BY F-TL-MES/CAN MESSAGE: ENGINE TORQUE INVALID

FAULT CODE 34: CAN MESSAGE MD-IND INVALID (FFH)/CAN MESSAGE: ENGINE TORQUE INVALID

FAULT CODE 35: CAN MESSAGE N-MOT INVALID, INDICATED BY F-N-MOT/CAN MESSAGE: ENGINE SPEED INVALID

FAULT CODE 37: CAN MESSAGE T-ANS INVALID (FFH)/CAN MESSAGE: ENGINE AIR INTAKE TEMPERATURE INVALID

FAULT CODE 38: CAN MESSAGE FHOEHE INVALID (FFH)/CAN MESSAGE: ALTITUDE SHIFT CONTROL INVALID

FAULT CODE 39: RANGE SWITCH PLAUSIBILITY ERROR/TRANSMISSION HIGH/LOW RANGE IMPLAUSIBLE INPUT

All sections

SUMMARY Land Rover Discovery L318

Automatic Transmission Diagnosis - with Codes

SUMMARY

If no hard DTCs are present, and driveability symptoms or intermittent DTCs exist, attempt diagnosis by symptom, or by testing individual components related to system fault. See TROUBLE SHOOTING .

Note. Always clear DTCs once repairs are complete. See CLEARING DIAGNOSTIC TROUBLE CODES . Road test vehicle and retrieve DTCs to determine if complaint or DTC is repaired.