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Automatic Transmission: Diagnosis Ford Focus I рестайлинг

Automatic Trans 43 illustrations ~5423 words

Diagnostic Strategy

Troubleshooting an electronically-controlled automatic transaxle is simplified by using the proven method of diagnosis. One of the most important things to remember is that there is a definite procedure to follow.

Note. Do not take any short cuts or assume that critical checks or adjustments have already been made.

Follow the procedures as written to avoid missing critical components or steps.

To correctly diagnose a concern, use the following information

  1. «INTRODUCTION - CNG, FLEX-FUEL & GASOLINE»(ref-225317) .
  2. TSBs.
  3. «SYSTEM WIRING DIAGRAMS»(ref-163988) .

This informtion provides the necessary information when diagnosing transaxle concerns.

Use the DIAGNOSTIC FLOW CHART as a guide and follow the steps as indicated.

Preliminary Inspection

  1. Know and understand the customers concern.
  2. Verify the concern by operating the vehicle.
  3. Check the fluid levels and condition.
  4. Check for non-factory add-on items.
  5. Check shift linkages for correct adjustment.
  6. Check TSBs regarding the concern.

Diagnostics

  1. Carry out on-board diagnostic procedures key on engine off (KOEO) and key on engine running (KOER).
  2. Record all diagnostic trouble codes (DTCs).
  3. Repair all non-transaxle codes first.
  4. Repair all transaxle codes second.
  5. Erase all continuous codes and attempt to repeat them.
  6. Repair all continuous codes.
  7. If only pass codes are obtained, proceed to the Diagnosis by Symptom Index for further information and diagnosis.

Follow the diagnostic sequence to diagnose and repair the concern the first time.

Diagnostic Flow Chart

TestResultAction
Know and understand the customer concerns. Check the fluid level and condition. Verify the concern by operating the vehicle. Check for non-factory installed items and verify correct installation. Check the shift linkage adjustments. Check TSBs messages for vehicle concerns. Carry out quick test both KOER and KOEO. Record all codes. 1) Did you record any Diagnostic Trouble Codes?YesRepair all hard Diagnostic Trouble Codes. Follow the pinpoint tests. Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE first, then this article.
NoRefer to DIAGNOSIS BY SYMPTOM , then GO to Step 5.
2) Are any continuous test memory codes present?YesClear codes and carry out drive cycle test.
NoGO to Step 4.
3) Did the continuous test memory codes reappear?YesRepair all continuous test memory codes. Follow the pinpoint tests. Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE then this article, then GO to Step 4.
NoGO to Step 4.
4) Is the concern repaired?YesCarry out the final quick test to verify that no Diagnostic Trouble Codes are present. Clear memory codes. Return vehicle to customer.
NoRefer to DIAGNOSIS BY SYMPTOM .
5) Are there any electrical concerns?YesInstall the diagnostic tool and carry out output state control test, then GO to Step 6.
NoRefer to the hydraulic and mechanical routine to diagnose and repair the concern, then GO to Step 7.
6) Was the transaxle concern corrected when the diagnostic tool was installed?YesRefer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE , intermittent fault diagnosis and use the diagnostic tool to diagnose cause of concern in the processor, vehicle harness or external inputs (sensors or switches).
NoRefer to the hydraulic and mechanical routine to diagnose the concern, then GO to Step 7.
7) Is the concern repaired?YesCarry out the final quick test to verify that no diagnostic trouble codes are present. Clear memory codes. Return the vehicle to the customer.
NoNo additional information available. Repeat test as necessary.

DIAGNOSTIC FLOW

The following items must be checked prior to beginning the diagnostic procedures

Road Testing Vehicle

Note. Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.

The Shift Point Road Test and Torque Converter Clutch Operation Test provide diagnostic information on transaxle shift controls and torque converter operation.

Shift Point Road Test

This test verifies that the shift control system is operating correctly.

  1. Bring engine and transaxle up to normal operating temperature.
  2. Operate the vehicle with the selector lever in the D position (overdrive switch ON).
  3. Apply minimum throttle and observe the speeds at which upshift occurs and torque converter engages. Refer to the «SHIFT SPEEDS CHART»(ref-207762-S12825032862005120200000) for the appropriate final drive ratio.
  4. Stop the vehicle. Select the D position (overdrive switch OFF). Repeat Step 3. The transaxle will make all upshifts, except third to fourth, and torque converter clutch apply should occur above 80 km/h (50 mph).
  5. Press the accelerator pedal to the floor, wide open throttle (WOT). The transaxle should shift from third to second, or third to first, depending on vehicle speed, and torque converter clutch should release.
  6. With vehicle speed above 48 km/h (30 mph), move the transaxle range selector lever from D position to first position and release the accelerator pedal. The transaxle should immediately downshift to second gear. When vehicle speed drops below 32 km/h (20 mph), the transaxle should downshift into first gear.
  7. If transaxle fails to upshift/downshift or torque converter clutch does not apply/release, refer to «DIAGNOSIS BY SYMPTOM»(ref-207762-S42303105312005120200000) for possible causes.

Visual Inspection

This inspection will identify modifications or additions to the vehicle operating system that may affect diagnosis. Inspect the vehicle for non-Ford factory add-on devices such as

  1. Electronic add-on items: air conditioning generator (alternator) engine turbo cellular telephone cruise control cb radio linear booster backup alarm signal computer
  2. Vehicle modification

These items, if not installed correctly, will affect the powertrain control module (PCM), or transaxle function. Pay particular attention to add-on wiring splices in the PCM harness or transaxle wiring harness, abnormal tire size, or axle ratio changes.

  1. leaks; refer to «LEAKAGE INSPECTION»(ref-207762-S01915985562005120200000) .
  2. correct linkage adjustments; refer to «TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS»(ref-207764) .

Carry Out On-Board Diagnostics (KOEO, KOER)

After a road test, with the vehicle warm and before disconnecting any connectors, carry out the Quick Test using diagnostic tool. Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE for diagnosis and testing of the powertrain control system.

Scheme 14

Scheme 14: Special Tool(s)
Scheme 14: Special Tool(s)

Diagnosing an electronically controlled automatic transaxle is simplified using the following procedures. It is important to remember that there is a definite procedure to follow. Do not take short cuts or assume that critical checks or adjustments have already been made. Follow the procedures as written to avoid missing critical components or steps. By following the diagnostic sequence, the technician will be able to diagnose and repair the concern the first time.

On-Board Diagnostics with Diagnostic Tool

Note. For detailed instruction and other diagnostic methods using the diagnostic tool, refer to the tester and INTRODUCTION - CNG, FLEX-FUEL & GASOLINE .

These quick tests should be used to diagnose the powertrain control module and should be carried out in order.

  1. Quick Test 1.0 - Visual Inspection
  2. Quick Test 2.0 - Set Up
  3. Quick Test 3.0 - Key ON, Engine OFF
  4. Quick Test 4.0 - Continuous Memory
  5. Quick Test 5.0 - Key ON, Engine RUN
  6. Special Test Mode Wiggle Test Mode Output Test Mode
  7. PCM Reset Mode
  8. Clearing DTCs
  9. OBD II Drive Cycle
  10. Other Diagnostic Tool Features

For further information on other diagnostic testing features using the diagnostic tool, refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE . Other diagnostic methods include the following

  1. Parameter Identification (PID) Access Mode
  2. Freeze Frame Data Access Mode
  3. Oxygen Sensor Monitor Mode

Transaxle Drive Cycle Test

Note. Always drive the vehicle in a safe manner according to driving conditions and obey all traffic laws.

Note. The Transaxle Drive Cycle Test must be followed exactly. Transaxle failure must occur 4 times consecutively for shift error DTC code to be set, and 5 times consecutively for continuous torque converter clutch code to set.

Note. When carrying out the Transaxle Drive Cycle Test, refer to Solenoid Operational Charts for correct solenoid operation. Refer to SPECIFICATIONS .

After carrying out the Quick Test, use the Transaxle Drive Cycle Test for checking continuous codes.

  1. Record and then erase Quick Test codes.
  2. Warm engine to normal operating temperature.
  3. Make sure transaxle fluid level is correct.
  4. With transaxle in O/D position, moderately accelerate from stop to 80 km/h (50 mph). This allows the transaxle to shift into 4th gear. Hold speed and throttle open steady for a minimum of 15 seconds.
  5. With transaxle in 4th gear and maintaining steady speed and throttle opening, lightly apply and release brake to operate stop lamps. Then hold speed and throttle steady for a minimum of 5 seconds.
  6. Brake to a stop and remain stopped for a minimum of 20 seconds.
  7. Repeat Steps 4 through 6 at least 5 times.
  8. Carry out Quick Test and record continuous DTCs.

After On-Board Diagnostics

Note. The vehicle wiring harness, powertrain control module and non-transaxle sensors may affect transaxle operations. Repair these concerns first.

After the on-board diagnostic procedures are completed, repair all DTCs.

Begin with non-transaxle related DTCs, then repair any transaxle related DTCs. Refer to DIAGNOSTIC TROUBLE CODE CHARTS for information on condition and symptoms. This chart will be helpful in referring to the correct manual(s) and aids in diagnosing internal transaxle concerns and external non-transaxle inputs. The pinpoint tests are used in diagnosing transaxle electrical concerns. Make sure that the vehicle wiring harness and the PCM are diagnosed as well. INTRODUCTION - CNG, FLEX-FUEL & GASOLINE will aid in diagnosing non-transaxle electronic components.

Diagnostic Trouble Code Charts

Five Digit DTCComponentDescriptionConditionSymptomAction
P0705TR SensorTR Circuit FailureTR circuits, indicating an invalid pattern in TR_D. Condition caused by a short to ground or an open in P/N, D, R, 2 or 1 circuits. Open in the taillamp ground circuit. This DTC can be set by an incorrectly adjusted TR sensor.Increase in control pressure (harsh shifts). Defaults to D for an invalid position. MIL on.Inspect the taillamp ground circuit. Go to PINPOINT TEST .
P0712TFT157°C (315°F) Indicated TFT Sensor Circuit GroundedVoltage drop across TFT sensor too low for scale set for temperature 157°C (315°F).Possible firm shift feel.Go to PINPOINT TEST B .
P0713TFT40 °C (-40 °F) Indicated TFT Sensor Circuit OpenVoltage drop across TFT sensor too high for scale set temperature -40°C (-40 °F).Possible firm shift feel.Go to PINPOINT TEST B .
P0715TSSInsufficient Input From Turbine Shaft Speed SensorPCM detected a loss of TSS signal during operation.Harsh shifts, no torque converter clutch activation, and harsh engagement.Go to PINPOINT TEST E .
P0717TSSTurbine Shaft Speed Sensor Signal IntermittentPCM detected a loss of TSS signal during operation.Harsh shifts, no torque converter clutch activation, and harsh engagement.Go to PINPOINT TEST E .
P0718TSSTSS Sensor Signal ErraticPCM has detected an erratic TSS signal.Harsh shifts, no torque converter clutch activation, and harsh engagement.Go to PINPOINT TEST E .
P0720OSSInsufficient Input From OSS SensorPCM detected a loss of OSS signal during operation.Harsh shift, possible abnormal shift schedule.Go to PINPOINT TEST E .
P0721OSSOSS Sensor Signal NoisyPCM has detected an erratic OSS signal.Harsh shift, abnormal shift schedule.Go to PINPOINT TEST E .
P0722OSSOSS Sensor Signal IntermittentPCM has detected an intermittent OSS signal.Harsh shift, abnormal shift schedule.Go to PINPOINT TEST E .
P0731SSA, SSB, SSC or1st Gear ErrorNo 1st gear.Incorrect gear selection depending on failure or mode and manual lever position. Shift errors may also be due to other internal transmission concerns (stuck valves, damaged friction material). Engine RPM could be higher or lower than expected.Refer to Solenoid On/Off Charts. Go to PINPOINT TEST A .
P0732SSA, SSB, SSC or Internal Parts2nd Gear ErrorNo 2nd gear.Incorrect gear selection depending on failure or mode and manual lever position. Shift errors may also be due to other internal transmission concerns (stuck valves, damaged friction material). Engine RPM could be higher or lower than expected.Refer to Solenoid On/Off Charts. go to PINPOINT TEST A .
P0733SSA, SSB, SSC or Internal Parts3rd Gear ErrorNo 3rd gear.Incorrect gear selection depending on failure or mode and manual lever position. Shift errors may also be due to other internal transmission concerns (stuck valves, damaged friction material). Engine RPM could be higher or lower than expected.Refer to Solenoid On/Off Charts. Go to PINPOINT TEST A .
P0734SSA, SSB, SSC or Internal Parts4th Gear ErrorNo 4th gear.Incorrect gear selection depending on failure or mode and manual lever position. Shift errors may also be due to other internal transmission concerns (stuck valves, damaged friction material). Engine RPM could be higher or lower than expected.Refer to Solenoid On/Off Charts. Go to PINPOINT TEST A .
P0741TCCTCC Slippage DetectedThe PCM picked up an excessive amount of TCC slippage during normal vehicle operation.TCC slippage/erratic or no torque converter clutch operation.Refer to DIAGNOSIS BY SYMPTOM .
P0750SSASSA Solenoid Circuit FailureSSA circuit failed to provide voltage drop across solenoid. Circuit open or shorted or PCM driver failure during on-board diagnostic.No reverse gear (short) or no 4th gear (open). MIL on.Go to PINPOINT TEST A .
P0751SSASSA Functional Failure (Stuck Off)Mechanical or hydraulic failure of the shift solenoid.Not all gears present, MIL on.Refer to DIAGNOSIS BY SYMPTOM .
P0752SSASSA Functional Failure (Stuck On)Mechanical or hydraulic failure of the shift solenoid.Not all gears present, MIL on.Refer to DIAGNOSIS BY SYMPTOM .
P0753SSASSA Solenoid Circuit FailureSSA circuit failed to provide voltage drop across solenoid. Circuit open or shorted or PCM driver failure during on-board diagnostic.No reverse gear (short) or no 4th gear (open). MIL off.Go to PINPOINT TEST A .
P0755SSBSSB Solenoid Circuit FailureSSB circuit fails to provide voltage drop across solenoid. Circuit open or shorted or PCM driver failure during on-board diagnostic.Not all gears present. No converter clutch apply in 3rd and 4th gears.Go to PINPOINT TEST A .
P0756SSBSSB Functional Failure (Stuck OFF)Mechanical or hydraulic failure of the shift solenoid. Not all gears present.No converter clutch apply in 3rd and 4th gears.Refer to DIAGNOSIS BY SYMPTOM .
P0757SSBSSB Functional Failure (Stuck ON)Mechanical or hydraulic failure of the shift solenoid. Not all gears present.No converter clutch apply in 3rd and 4th gears.Refer to DIAGNOSIS BY SYMPTOM .
P0758SSBSSB Solenoid Circuit FailureSSB circuit fails to provide voltage drop across solenoid. Circuit open or shorted or PCM driver failure during on-board diagnostic.Not all gears present. No converter clutch apply in 3rd and 4th gears. MIL off.Go to PINPOINT TEST A .
P0760SSCSSC Solenoid Circuit FailureSSC circuit fails to provide voltage drop across solenoid. Circuit open or shorted or PCM driver failure during on-board diagnostic.Not all gears present.Go to PINPOINT TEST A .
P0761SSCSSC Functional Failure (Stuck OFF)Mechanical or hydraulic failure of the shift solenoid.Not all gears present.Go to PINPOINT TEST A .
P0762SSCSSC Functional Failure (Stuck ON)Mechanical or hydraulic failure of the shift solenoid.Not all gears present.Go to PINPOINT TEST A .
P0763SSCSSC Solenoid Circuit FailureSSC circuit fails to provide voltage drop across solenoid. Circuit open or shorted or PCM driver failure during on-board diagnostic.Not all gears present. MIL off.Go to PINPOINT TEST A .
P0765SSDSSD Solenoid Circuit FailureSSD circuit fails to provide voltage drop across solenoid. Circuit open, shorted or PCM driver circuit failure during on-board diagnostics.Not all gears present. MIL on.Go to PINPOINT TEST A .
P0766SSDSSD Functional Failure (Stuck OFF)Mechanical or hydraulic failure of the shift solenoid.Not all gears present.Go to PINPOINT TEST A .
P0767SSDSSD Functional Failure (Stuck ON)Mechanical or hydraulic failure of the shift solenoid.Not all gears present.Go to PINPOINT TEST A .
P0768SSDSSD Solenoid Circuit FailureSSD circuit fails to provide voltage drop across solenoid. Circuit open, shorted or PCM driver circuit failure during on-board diagnostics.Not all gears present. MIL off.Go to PINPOINT TEST A .
P0770SSESSE Solenoid Circuit FailureSSE circuit failed to provide voltage drop across solenoid. Circuit open. Shorted or PCM driver circuit failed during on-board diagnostics.Not all gears present. MIL on.Go to PINPOINT TEST A .
P0771SSESSE Functional Failure (Stuck OFF)Mechanical or hydraulic failure of the shift solenoid.Not all gears present.Go to PINPOINT TEST A .
P0772SSESSE Functional Failure (Stuck ON)Mechanical or hydraulic failure of the shift solenoid.Not all gears present.Go to PINPOINT TEST A .
P0773SSESSE Solenoid Circuit FailureSSE circuit failed to provide voltage drop across solenoid. Circuit open. Shorted or PCM driver circuit failed during on-board diagnostics.Not all gears present. MIL off.Go to PINPOINT TEST A .
P0960EPCEPC Solenoid Circuit OpenVoltage through EPC solenoid is checked. Error is noted if tolerance is exceeded.Open circuit-causes maximum EPC pressure, harsh engagements and shifts.Go to PINPOINT TEST D .
P0962EPCEPC Solenoid Circuit Failure, Shorted Circuit to GroundVoltage through EPC solenoid is checked. An error will be noted if tolerance is exceeded.Short circuit causes maximum EPC pressure, harsh engagement and shifts.Go to PINPOINT TEST D .
P0963EPCEPC Solenoid Circuit Failure, Shorted Circuit to PowerVoltage through EPC solenoid is checked. An error will be noted if tolerance is exceeded.Short circuit causes maximum EPC pressure, harsh engagement and shifts.Go to PINPOINT TEST D .
P0972SSASSA Functional Failure (Stuck OFF)Mechanical or hydraulic failure of the shift solenoid.Not all gears present, MIL off.Refer to DIAGNOSIS BY SYMPTOM .
P0975SSBSSB Functional Failure (Stuck OFF)Mechanical or hydraulic failure of the shift solenoid.Not all gears present. No converter clutch apply in 3rd and 4th gears. MIL off.Refer to DIAGNOSIS BY SYMPTOM
P0978SSCSSC Functional Failure (Stuck OFF)Mechanical or hydraulic failure of the shift solenoid.Not all gears present. MIL off.Go to PINPOINT TEST A .
P0981SSDSSD Functional Failure (Stuck OFF)Mechanical or hydraulic failure of the shift solenoid.Not all gears present. MIL off.Go to PINPOINT TEST A .
P0984SSESSE Functional Failure (Stuck OFF)Mechanical or hydraulic failure of the shift solenoid.Not all gears present. MIL off.Go to PINPOINT TEST A .
P1700Undetermined FailureTransmission failed to NEUTRAL.Transmission functional failure.When this code is shown in conjunction with other codes, repair the other codes first, then retest. If this code reappears, refer to DIAGNOSIS BY SYMPTOM .
P1702TR SensorTR Circuit FailureTR circuits indicating an invalid pattern in TR_D. Condition caused by a short to ground or an open in P/N, D, R, 2 or 1 circuit. Open in the taillamp ground circuit. This DTC can be set by an incorrectly adjusted TR sensor.Increase in control pressure (harsh shifts). Defaults to D for an invalid position. MIL off.Inspect the taillamp ground circuit.
P1705TR SensorTR Not in PARK or NEUTRAL During KOEO/ KOERKOEO/KOER not run in PARK or NEUTRAL; or TR circuit failure.Harsh shifts or engagements.Go to PINPOINT TEST C Rerun KOEO/KOER in PARK or NEUTRAL.
P1710TFTStuck in MidrangePCM never detects a change in fluid temperature.Occasional hard shifts.Go to PINPOINT TEST B .
P1711TFTTFT Out of On-Board Diagnostic RangeTransmission not at operating temperature during on-board diagnostic.DTC set-vehicle cold or overheated.Warm or cool vehicle to normal operating temperature. Go to PINPOINT TEST B .
P1713TFTNo Change in TFT - Low RangePCM has detected no TFT change at low range during operation.Incorrect TCC engagement schedule, harsh engagement, harsh shifts.Go to PINPOINT TEST B .
P1718TFTNo Change in TFT -High RangePCM has detected no TFT change at high range during operation.Incorrect TCC engagement schedule, harsh engagement, harsh shifts.Go to PINPOINT .
P1780TCSTCS Input Incorrect for Selected PositionTCS voltage incorrect.No overdrive cancel when lever is moved.Rerun on-board diagnostic and cycle switch. For additional information, refer to TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS .
P1783TFTTransmission Overtemp Condition IndicatedTransmission fluid temperature exceeded 135°C (275°F).Increase in control pressure.Go to PINPOINT TEST B .

DIAGNOSTIC TROUBLE CODE

Scheme 15

Scheme 15: Transaxle Solenoid Location
Scheme 15: Transaxle Solenoid Location

Scheme 16

Scheme 16: Transaxle Internal Harness Connectors
Scheme 16: Transaxle Internal Harness Connectors

Scheme 17

Scheme 17: Transaxle Vehicle Harness Connector
Scheme 17: Transaxle Vehicle Harness Connector

Scheme 18

Scheme 18: Transmission Range (TR) Sensor Vehicle Harness Connector
Scheme 18: Transmission Range (TR) Sensor Vehicle Harness Connector

Scheme 19

Scheme 19: Output Shaft Speed Sensor (OSS) Vehicle Harness Connector
Scheme 19: Output Shaft Speed Sensor (OSS) Vehicle Harness Connector

Scheme 20

Scheme 20: Turbine Shaft Speed (TSS) Sensor Vehicle Harness Connector
Scheme 20: Turbine Shaft Speed (TSS) Sensor Vehicle Harness Connector

Transmission Range (TR) Sensor Diagnosis Chart

Selector PositionTR Sensor Pins Component SideExpected Value
PARK1 and 2, 3 and 4Less than 5 ohms
REVERSE3 and 5Less than 5 ohms
NEUTRAL1 and 2, 3 and 6Less than 5 ohms
DRIVE3 and 7Less than 5 ohms
23 and 8Less than 5 ohms
13 and 9Less than 5 ohms

TRANSMISSION RANGE (TR) SENSOR DIAGNOSIS CHART

Scheme 21

Scheme 21: Special Tool(s)
Scheme 21: Special Tool(s)

Any time an electrical connector or solenoid body is disconnected, inspect the connector for terminal condition, corrosion and contamination. Also inspect the connector seal for damage. Clean, repair or install new as necessary.

Shift Solenoid Pre-Diagnosis

Use the shift solenoid operation chart when carrying out Pinpoint Test A. For additional information, refer to SPECIFICATION .

PINPOINT TEST B: TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR

Note. Refer to the TRANSAXLE VEHICLE HARNESS CONNECTOR illustration preceding these pinpoint tests.

Note. Refer to the TRANSAXLE INTERNAL HARNESS CONNECTORS illustration preceding these pinpoint tests.

B1 ELECTRONIC DIAGNOSTIC SET UP

  1. Key in OFF position.
  2. Shift selector lever to position P.
  3. Check to make sure the transaxle harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
  4. Connect the diagnostic tool.
  5. Key in ON position.
  6. Select Diagnostic Data Link.
  7. Select PCM.
  8. Select PID/Data Monitor and Record.
  9. Enter the following diagnostic mode on the diagnostic tool: PIDs; TFT, TFTV.
  10. Does the vehicle enter PID/Data Monitor and Record?

Yes

REMAIN in PID/Data Control. GO to B2.

No

REPEAT procedure to enter PID. If vehicle did not enter PID, REFER to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE for diagnosis of PCM.

B2 WARM-UP/COOL-DOWN CYCLE VERIFICATION

  1. While monitoring the TFT PIDs, carry out the following test: If transaxle is cold, run transaxle to warm it up. If transaxle is warm, allow transaxle to cool down.
  2. Do the TFT PIDs increase as the transaxle is warmed up or decrease as the transaxle is cooled or does the TFT or TFTV drop in and out of range?

Yes

If the TFT PIDs increase as the transaxle is warmed or decrease as the transaxle is cooled, CLEAR all DTCs. Road test to verify if concern is still present. If concern is still present, REFER to DIAGNOSIS BY SYMPTOM to diagnose transaxle overheating. If the TFT drops in and out of range, INSPECT for intermittent concern in the internal/external harness, sensor or connector.

No

GO to B3.

B3 CHECK POWERTRAIN CONTROL MODULE AND VEHICLE HARNESS FOR POWER

Scheme 22

Scheme 22
Scheme 22
  1. Disconnect: Transaxle Vehicle Harness Connector.
  2. Visually inspect all wires and connectors for damage.
  3. Measure the voltage between transaxle vehicle harness connector pin 5, harness side and ground; and between transaxle vehicle harness connector pin 4, harness side and ground.
  4. Is any voltage present?

Yes

GO to B4.

No

GO to B5.

B4 CHECK VEHICLE HARNESS FOR SHORT TO POWER

Scheme 23

Scheme 23
Scheme 23
  1. Disconnect: PCM Connector.
  2. Measure the voltage between transaxle vehicle harness connector pin 5, harness side and ground; and between transaxle vehicle harness connector pin 4, harness side and ground.
  3. Is any voltage present?

Yes

REPAIR the circuit. TEST the system for normal operation.

No

INSTALL a new PCM. TEST the system for normal operation.

B5 CHECK POWERTRAIN CONTROL MODULE AND VEHICLE HARNESS FOR GROUND

Scheme 24

Scheme 24
Scheme 24
  1. Connect: PCM Connector.
  2. Measure the resistance between transaxle vehicle harness connector pin 5, harness side and ground; and between transaxle vehicle harness connector pin 4, harness side and ground.
  3. Is the resistance greater than 10,000 ohms?

Yes

GO to B7.

No

GO to B6.

B6 CHECK VEHICLE HARNESS FOR SHORT TO GROUND

Scheme 25

Scheme 25
Scheme 25
  1. Disconnect: PCM Connector.
  2. Measure the resistance between transaxle vehicle harness connector pin 5, harness side and ground; and between transaxle vehicle harness connector pin 4, harness side and ground.
  3. Is the resistance greater than 10,000 ohms?

Yes

INSTALL a new PCM. TEST the system for normal operation.

No

REPAIR the circuit. TEST the system for normal operation.

B7 CHECK VEHICLE HARNESS FOR OPEN

Scheme 26

Scheme 26
Scheme 26

Scheme 27

Scheme 27
Scheme 27

Scheme 28

Scheme 28
Scheme 28

Scheme 29

Scheme 29
Scheme 29
  1. Install breakout box.
  2. Vehicles equipped with 2.0L engine, measure the resistance between transaxle vehicle harness connector pin 5, harness side and EEC-V 104-pin breakout box pin 37, harness side; and between transaxle vehicle harness connector pin 4, harness side and EEC-V 104-pin breakout box pin 91, harness side.
  3. Vehicles equipped with 2.3L engine, measure the resistance between transaxle vehicle harness connector pin 5, harness side and EEC-V 225-pin breakout box pin 29, harness side; and between transaxle vehicle harness connector pin 4, harness side and EEC-V 225-pin breakout box pin 41, harness side.
  4. Is the resistance less than 5 ohms?

Yes

GO to B8.

No

REPAIR the circuit. TEST the system for normal operation.

B8 CHECK THE TRANSAXLE INTERNAL HARNESS FOR SHORT TO GROUND

Scheme 30

Scheme 30
Scheme 30
  1. Measure the resistance between transaxle vehicle harness connector pin 5 (component side, transaxle internal harness), and ground; and between transaxle vehicle harness connector pin 4 (component side, transaxle internal harness), and ground.
  2. Is the resistance greater than 10,000 ohms?

Yes

GO to B9.

No

INSTALL a new transaxle internal harness. TEST the system for normal operation.

B9 CHECK THE TRANSAXLE INTERNAL HARNESS FOR AN OPEN

Scheme 31

Scheme 31
Scheme 31

Scheme 32

Scheme 32
Scheme 32
  1. Measure the resistance between transaxle vehicle harness connector pin 5 (component side, transaxle internal harness), and transmission fluid temperature sensor internal harness connector pin 5; and between transaxle vehicle harness connector pin 4 (component side, transaxle internal harness), and transmission fluid temperature sensor internal harness connector pin 4.
  2. Is the resistance less than 5 ohms?

Yes

GO to B10.

No

INSTALL a new transaxle internal harness. TEST the system for normal operation.

B10 CHECK RESISTANCE OF TFT SENSOR

  1. Measure the resistance between transaxle vehicle harness connector pin 5 (component side, transaxle internal harness), and transaxle vehicle harness connector pin 4 (component side, transaxle internal harness). Record the resistance. Resistance should be approximately in the following ranges: 20°C (-4°F) - 236-317 Kohms 0°C (32°F) -83.2-107 Kohms 20°C (68°F) -33.5-41.2 Kohms 40°C (104°F) -14.6-17.6 Kohms 60°C (140°F) -7.08-8.01 Kohms 80°C (176°F) -3.61-4.06 Kohms 100°C (212°F) -1.96-2.20 Kohms 120°C (248°F) -1.13-1.25 Kohms 130°C (266°F) -0.87-0.96 Kohms
  2. Is the resistance in the range?

Yes

REFER to DIAGNOSIS BY SYMPTOM to diagnose an overheating concern.

No

INSTALL a new TFT sensor. TEST the system for normal operation.

PINPOINT TEST C: TRANSMISSION RANGE (TR) SENSOR

Note. Refer to the TRANSMISSION RANGE (TR) SENSOR VEHICLE HARNESS CONNECTOR illustration preceding these pinpoint tests.

Note. Refer to the TRANSMISSION RANGE (TR) SENSOR DIAGNOSIS CHART preceding these pinpoint tests.

Note. DTC code P0705 may also be set from an open ground in the taillamp circuit. Check and repair taillamp circuit as necessary.

C1 VERIFY TR SENSOR ALIGNMENT

  1. Verify TR sensor alignment.
  2. Is the TR sensor correctly aligned?

Yes

GO to C2.

No

ADJUST the TR sensor. TEST the system for normal operation.

C2 VERIFY SHIFT CABLE/LINKAGE ADJUSTMENT

  1. Verify that the shift cable/linkage is correctly adjusted. REFER to «TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS»(ref-207764) .
  2. Is the shift cable/linkage correctly adjusted?

Yes

GO to C3.

No

ADJUST the shift cable/linkage REFER to TRANSAXLE/TRANSMISSION EXTERNAL CONTROLS . Test the system for normal operation.

C3 CHECK TR SENSOR POWER SUPPLY START CIRCUIT

Scheme 33

Scheme 33
Scheme 33
  1. Disconnect: TR Sensor Connector.
  2. Disconnect: Ignition Coil.
  3. Key in START position.
  4. Measure the voltage between TR sensor connector pin 6, harness side and ground.
  5. Is the voltage approximately 12 volts?

Yes

GO to C4.

No

REPAIR start circuit 50 BB14(GY/RD). TEST the system for normal operation.

C4 CHECK POWER SUPPLY TRANSAXLE CIRCUIT

Scheme 34

Scheme 34
Scheme 34
  1. Connect: Ignition Coil.
  2. Key in ON position.
  3. Measure the voltage between TR sensor connector pin 1, harness side and ground.
  4. Is the voltage greater than 10 volts?

Yes

GO to C6.

No

GO to C5.

C5 CHECK VEHICLE HARNESS FOR SHORT TO GROUND

Scheme 35

Scheme 35
Scheme 35
  1. Key in OFF position.
  2. Disconnect: PCM Connector.
  3. Measure the resistance between TR sensor connector pin 1, harness side and ground.
  4. Is the resistance greater than 10,000 ohms?

Yes

GO to C6.

No

REPAIR circuit. TEST the system for normal operation.

C6 CHECK VEHICLE HARNESS FOR AN OPEN CIRCUIT

Scheme 36

Scheme 36
Scheme 36
  1. Key in OFF position.
  2. Disconnect: PCM Connector.
  3. Install EEC-V 104-pin breakout box.
  4. Vehicles equipped with 2.0L engine, measure the resistance between TR sensor pin 1, harness side and EEC-V 104-pin breakout box pin 71, harness side.
  5. Vehicles equipped with 2.3L engine, measure the resistance between TR sensor pin 1, harness side and vehicle power, harness side.
  6. Is the resistance less than 5 ohms?

Yes

GO to C7.

No

REPAIR the circuit. TEST the system for normal operation

C7 CHECK TR SENSOR CIRCUITRY FOR SHORT TO POWER

Scheme 37

Scheme 37
Scheme 37
  1. Connect: PCM Connector.
  2. Select PARK.
  3. Key in ON position.
  4. Measure the voltage between TR sensor connector pins 2, 3, 4, 5, 7, and 8 harness side and ground.
  5. Is any voltage present?

Yes

GO to C8.

No

GO to C1.

C8 CHECK PCM FOR SHORT TO POWER

Scheme 38

Scheme 38
Scheme 38
  1. Key in OFF position.
  2. Disconnect: PCM Connector.
  3. Key in ON position.
  4. Measure the voltage between TR sensor connector pins 2, 3, 4, 5, 7, and 8 harness side and ground.
  5. Is any voltage present?

Yes

REPAIR the circuit in question. TEST the system for normal operation.

No

INSTALL a new PCM. TEST the system for normal operation.

C9 CHECK VEHICLE HARNESS FOR SHORT TO GROUND

Scheme 39

Scheme 39
Scheme 39
  1. Key in OFF position.
  2. Disconnect: PCM Connector.
  3. Disconnect: Fuse F2.40 (10A).
  4. Measure the resistance between TR sensor connector pins 2, 3, 4, 5, 7, and 8 harness side and ground.
  5. Is the resistance greater than 10,000 ohms?

Yes

INSTALL a new PCM. TEST the system for normal operation.

No

REPAIR the circuit in question. TEST the system for normal operation.

C10 CHECK TR SENSOR CIRCUITRY FOR SHORT TO GROUND

Scheme 40

Scheme 40
Scheme 40
  1. Key in OFF position.
  2. Connect: PCM Connector.
  3. Disconnect: Fuse F2.40 (10A).
  4. Measure the resistance between TR sensor connector pins 2, 3, 4, 5, 7, and 8 harness side and ground.
  5. Is the resistance greater than 10,000 ohms?

Yes

GO to C11.

No

GO to C9.

C11 CHECK THE TR SENSOR RESISTANCE

  1. Connect: Fuse F2.40 (10A).
  2. Measure the resistance between TR sensor connector pins, component side, as follows: PARK position, TR sensor pins 6 and 5, 8 and 9 less than 5 ohms REVERSE position, TR sensor pins 1 and 4 less than 5 ohms NEUTRAL position, TR sensor pins 1 and 8 less than 5 ohms DRIVE position, TR sensor pins 1 and 2 less than 5 ohms 2 position, TR sensor pins 1 and 7 less than 5 ohms 1 position, TR sensor pins 1 and 3 less than 5 ohms
  3. Are the resistances within the expected values?

Yes

INSTALL a new PCM. TEST the system for normal operation.

No

INSTALL a new TR sensor. TEST the system for normal operation.

PINPOINT TEST D: ELECTRONIC PRESSURE CONTROL SOLENOID (PCA)

Note. Refer to the TRANSAXLE VEHICLE HARNESS CONNECTOR illustration preceding these pinpoint tests.

Note. Read and record all DTCs. All TR sensor and OSS DTCs must be repaired before entering Output State Control (OSC).

D1 ELECTRONIC DIAGNOSTICS SET UP

  1. Key in OFF position.
  2. Shift selector lever to position "P"
  3. Check to make sure the transaxle harness connector is fully seated, terminals are fully engaged in the connector and in good condition before proceeding.
  4. Install 300 psi pressure gauge into line tap.
  5. Connect the diagnostic tool.
  6. Key in START position.
  7. Start and run the engine.
  8. Enter the following diagnostic mode on the diagnostic tool: Diagnostic Data Link.
  9. Enter the following diagnostic mode on the diagnostic tool: PCM.
  10. Enter the following diagnostic mode on the diagnostic tool: Active Command Modes.
  11. Enter the following diagnostic mode on the diagnostic tool: Output State Control (OSC).
  12. Enter the following diagnostic mode on the diagnostic tool: Trans - Bench Mode.
  13. Does the vehicle enter the Trans-Bench Mode?

Yes

REMAIN in Trans-Bench Mode. GO to D2.

No

REPEAT procedure to ENTER Trans-Bench Mode. If vehicle did not enter OSC, REFER to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE for diagnosis of PCM.

D2 SOLENOID FUNCTIONAL TEST

  1. Monitor pressure gauge.
  2. Enter the following diagnostic mode on the diagnostic tool: Parameter; PCA.
  3. Select PCA
  4. Increase engine speed above 1,500 rpm.
  5. Select value: 50, 70, 90, 110, 130 or 150 psi.
  6. Press "SEND".
  7. Select another value "50-150 psi".
  8. Press "SEND".
  9. Enter the following diagnostic mode on the diagnostic tool: XXX.
  10. Press "SEND"
  11. Does the pressure reading match the commanded pressure?

Yes

CLEAR DTCs. TEST the system for normal operation.

No

GO to D3.

D3 CHECK VEHICLE HARNESS AND POWERTRAIN CONTROL MODULE FOR SHORT TO POWER

Scheme 41

Scheme 41
Scheme 41
  1. Key in OFF position.
  2. Disconnect: Transaxle Vehicle Harness Connector.
  3. Visually inspect all wires and connectors for damage.
  4. Key in ON position.
  5. Measure the voltage between transaxle vehicle harness connector pin 7, harness side and ground; and between transaxle vehicle harness connector pin 2, harness side and ground.
  6. Is any voltage present?

Yes

GO to D4.

No

GO to D5.

D4 CHECK VEHICLE HARNESS FOR SHORT TO POWER

Scheme 42

Scheme 42
Scheme 42
  1. Key in OFF position.
  2. Disconnect: PCM Connector.
  3. Key in ON position.
  4. Measure the voltage between transaxle vehicle harness connector pin 7, harness side and ground; and between transaxle vehicle harness connector pin 2, harness side and ground.
  5. Is any voltage present?

Yes

REPAIR the circuit. TEST the system for normal operation.

No

INSTALL a new PCM. TEST the system for normal operation.

D5 CHECK ELECTRICAL SIGNAL

Scheme 43

Scheme 43
Scheme 43
  1. Measure the voltage between transaxle vehicle harness connector pin 7, harness side and transaxle vehicle harness connector pin 2, harness side.
  2. Activate solenoids (ON and OFF) while monitoring the voltage reading.
  3. Enter the following diagnostic mode on the diagnostic tool: Trans-Bench Mode.
  4. Enter the following diagnostic mode on the diagnostic tool: Parameter; PCA. Select a value "50-150 psi". Press "SEND".
  5. Select another value "50-150 psi". Press "SEND".
  6. Enter the following diagnostic mode on the diagnostic tool: XXX. Press "SEND".
  7. Does the voltage change?

Yes

GO to D6.

No

CHECK for open or short circuit in harness or PCM.

D6 CHECK THE TRANSAXLE INTERNAL HARNESS FOR SHORT TO GROUND

Scheme 44

Scheme 44
Scheme 44
  1. Key in OFF position.
  2. Disconnect: PCA Solenoid Electrical Connector.
  3. Measure the resistance between transaxle vehicle harness connector pin 2 (component side, transaxle internal harness), and ground; and between transaxle vehicle harness connector pin 7 (component side, transaxle internal harness), and ground.
  4. Is the resistance greater than 10,000 ohms?

Yes

GO to D7.

No

INSTALL a new transaxle internal harness. TEST the system for normal operation.

D7 CHECK THE TRANSAXLE INTERNAL HARNESS FOR AN OPEN

Scheme 45

Scheme 45
Scheme 45

Scheme 46

Scheme 46
Scheme 46
  1. Measure the resistance between transaxle vehicle harness connector pin 2 (component side, transaxle internal harness), and transaxle internal harness connector pin 2; and between transaxle vehicle harness connector pin 7 (component side, transaxle internal harness), and transaxle internal harness connector pin 7.
  2. Is the resistance less than 5 ohms?

Yes

GO to D8.

No

INSTALL a new transaxle internal harness. TEST the system for normal operation.

D8 CHECK SOLENOID RESISTANCE AT SOLENOID

  1. Key in OFF position.
  2. Measure and record the resistance between PCA solenoid pins.
  3. Is the resistance between 2.4 and 7.3 ohms?

Yes

GO to D9.

No

INSTALL a new PCA solenoid. TEST the system for normal operation.

D9 CHECK SOLENOID FOR SHORT TO GROUND

  1. Measure and record the resistance between the PCA solenoid and the solenoid body.
  2. Is the resistance greater than 10,000 ohms?

Yes

REFER to DIAGNOSIS BY SYMPTOM for diagnosis of pressure concerns. TEST the system for normal operation.

No

INSTALL a new PCA solenoid. TEST the system for normal operation.

PINPOINT TEST E: TURBINE SHAFT SPEED (TSS) SENSOR AND OUTPUT SHAFT SPEED (OSS) SENSOR

Note. Refer to the TURBINE SHAFT SPEED (TSS) SENSOR and output shaft speed (OSS) sensor connector illustrations preceding these pinpoint tests.

E1 ELECTRONIC DIAGNOSTICS SET UP

  1. Check to make sure the transaxle harness connectors are fully seated, terminals are fully engaged in connector and in good condition before proceeding.
  2. Connect the diagnostic tool.
  3. Key in ON position.
  4. Enter the following diagnostic mode on the diagnostic tool: Diagnostic Data Link.
  5. Enter the following diagnostic mode on the diagnostic tool: PCM.
  6. Select Trans Priority.
  7. Select PID/Data Monitor and Record.
  8. Select the following PIDs: TSS or OSS.
  9. Does vehicle enter PID/Data Monitor and Record?

Yes

REMAIN in PID/Data. GO to E2.

No

REPEAT procedure to ENTER PID. If vehicle did not enter PID, REFER to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE for diagnosis of PCM.

E2 DRIVE CYCLE TEST

  1. While monitoring the appropriate sensor PID, drive the vehicle so that the transaxle upshifts and downshifts through all gears.
  2. Does the TSS or OSS Speed PID increase and decrease with engine and vehicle speed?

Yes

Go to E3.

No

If the TSS or OSS Speed PID does not increase and decrease with engine and vehicle speed, INSPECT for open or short in vehicle harness, sensor, a PCM concern, or internal hardware concern. GO to E4.

E3 DRIVE CYCLE TEST ERRATIC

  1. While monitoring the appropriate sensor PID, drive the vehicle so that the transaxle upshifts and downshifts through all gears.
  2. Is the TSS or OSS Speed PID signal erratic (drop to zero or near zero and return to normal operation)?

Yes

If the sensor signal is erratic, INSPECT for intermittent concern in the harness, sensor, or connector.

GO to E4.

No

CLEAR all DTCs. Rerun OBD.

E4 CHECK POWERTRAIN CONTROL MODULE AND HARNESS FOR POWER

Scheme 47

Scheme 47
Scheme 47
  1. Key in OFF position.
  2. Disconnect: TSS Sensor Connector.
  3. Disconnect: OSS Sensor Connector.
  4. Key in ON position.
  5. For TSS, measure the voltage between TSS sensor connector pin 1, harness side and ground; and between TSS sensor connector pin 2, harness side and ground.
  6. For OSS, measure the voltage between OSS connector pin 1, harness side and ground; and between OSS connector pin 2, harness side and ground.
  7. Is there any voltage?

Yes

GO to E5.

No GO to E6.

E5 CHECK HARNESS FOR SHORT TO POWER

Scheme 48

Scheme 48
Scheme 48
  1. Key in OFF position.
  2. Disconnect: PCM Connector.
  3. Key in ON position.
  4. For TSS, measure the voltage between TSS sensor connector pin 1, harness side and ground; and between TSS sensor connector pin 2, harness side and ground.
  5. For OSS, measure the voltage between OSS connector pin 1, harness side and ground; and between OSS connector pin 2, harness side and ground.
  6. Is there any voltage?

Yes

REPAIR the circuit in question. TEST the system for normal operation.

No

INSTALL a new PCM. TEST the system for normal operation.

E6 CHECK POWERTRAIN CONTROL MODULE AND HARNESS FOR GROUND

Scheme 49

Scheme 49
Scheme 49
  1. Key in OFF position.
  2. Connect: PCM C415.
  3. For TSS, measure the resistance between TSS sensor connector pin 1, harness side and ground; and between TSS sensor connector pin 2, harness side and ground.
  4. For OSS, measure the resistance between OSS connector pin 1, harness side and ground; and between OSS connector pin 2, harness side and ground.
  5. Is the resistance greater than 10,000 ohms?

Yes

GO to E8.

No

GO to E7.

E7 CHECK HARNESS FOR SHORT TO GROUND

Scheme 50

Scheme 50
Scheme 50
  1. Key in OFF position.
  2. Disconnect: PCM Connector.
  3. For TSS, measure the resistance between TSS sensor connector pin 1, harness side and ground; and between TSS sensor connector pin 2, harness side and ground.
  4. For OSS, measure the resistance between OSS connector pin 1, harness side and ground; and between OSS connector pin 2, harness side and ground.
  5. Is the resistance greater than 10,000 ohms?

Yes

INSTALL a new PCM. TEST the system for normal operation.

No

REPAIR the circuit in question. TEST the system for normal operation.

E8 CHECK RESISTANCE OF TSS SENSOR OR OSS.

Scheme 51

Scheme 51
Scheme 51
  1. For TSS sensor, measure the resistance between TSS
  2. sensor connector pin 1, component side and TSS sensor connector pin 2, component side.
  3. For OSS, measure the resistance between OSS connector pin 1, component side and OSS connector pin 2, component side.
  4. Record the resistance. Resistance should be as follows: OSS 675-775 ohms at -20 °C (-4°F) OSS 800- 920 ohms at 21 °C (70°F) OSS 1210-1390 ohms at 160°C (302 °F) TSS 273-333 ohms at -20 °C (-4°F) TSS 330-390 ohms at 21 °C (70°F) TSS 487-601 ohms at 160 °C (302 °F)
  5. Is the resistance within specification for the appropriate sensor?

Yes

GO to E9.

No

INSTALL a new sensor. TEST the system for normal operation.

E9 CHECK SENSORS FOR SHORT TO GROUND

Scheme 52

Scheme 52
Scheme 52
  1. For TSS sensor, measure the resistance between TSS sensor connector pin 1, component side and ground.
  2. For OSS, measure the resistance between OSS connector pin 1, component side and ground.
  3. Is the resistance greater than 10,000 ohms?

Yes

INSTALL a new TSS sensor or OSS. TEST the system for normal operation.

No

REFER to DIAGNOSIS BY SYMPTOM , for diagnosis of shift or torque converter concerns.

Scheme 53

Scheme 53: Special Tool(s)
Scheme 53: Special Tool(s)

The special tests are designed to aid the technician in diagnosing the hydraulic and mechanical portion of the transaxle.

Line Pressure Test

CAUTIONCarry out the Line Pressure Test prior to carrying out the Stall Speed Test. If line pressure is low at stall, do not carry out the Stall Speed Test or further transaxle damage will occur. Do not maintain wide open throttle in any gear range for more than five seconds.

Note. Certain sensor failures may cause high PC, FMEM (Failure Mode Effect Management) actions. Make sure that self test and electrical repairs have been carried out, or test results may be incorrect.

This test verifies that the line pressure is within specifications.

Scheme 54

Scheme 54
Scheme 54
  1. Connect pressure gauge to the line pressure tap.
  2. Start engine and check line pressures. Refer to the «LINE PRESSURE CHART»(ref-207762-S28133328492005120200000) to determine if line pressure is within specifications.
  3. If line pressure is not within specification, refer to «LINE PRESSURE DIAGNOSIS CHART»(ref-207762-S32744178682005120200000) for line pressure concern causes.

Line Pressure Diagnosis Chart

Test ResultsPossible Source
Low pressure in all rangesWorn pump.
Low pressure in all rangesFluid leaking from pump, main control valve body or transaxle case.
Low pressure in all rangesPressure control solenoid inoperative.
Low pressure in all rangesSolenoid regulating valve sticking.
Low pressure in D, 2, 1 onlyFluid leaking from forward clutch hydraulic circuit.
Low pressure in 2Fluid leaking from intermediate/overdrive band hydraulic circuit.
Low pressure in 1, R onlyFluid leaking from low/reverse clutch hydraulic circuit.
Low in R onlyFluid leaking from reverse clutch hydraulic circuit.
High pressure in all rangesPressure control solenoid inoperative or open wire harness.
High pressure in all rangesPressure regulator valve sticking.
High pressure in all rangesPCM inoperative.

LINE PRESSURE DIAGNOSIS

Stall Speed Test

This test checks operation of the following items

  1. torque converter clutch
  2. forward clutch
  3. low one way clutch assembly
  4. engine performance
WARNINGApply the parking brake firmly while carrying out each stall test.
CAUTIONAlways carry out the Line Pressure Test procedures prior to carrying out the Stall Speed Test. If line pressure is low at stall, do not carry out the Stall Speed Test or further transaxle damage will occur.

Note. The Stall Speed Test should be carried out with the engine and transaxle at normal operating temperatures.

  1. Connect tachometer to the engine.
  2. Press accelerator pedal to floor (WOT) in each range. Record RPM reached in each range. Stall speeds should be as follows: STALL SPEED CHART Engine RPM 2.0L SPI 2,330-2,800 2.0L Zetec-E 2,300-2,500 2.3L PZEV 2,100-2,600
  3. If stall speeds were too high, refer to the following «STALL SPEED DIAGNOSIS CHART»(ref-207762-S35954848452005120200000) . If stall speeds were too low, first check the engine idle speed. If engine idle is OK, remove torque converter and check the torque converter one way clutch for slippage.

Stall Speed Diagnosis Chart

Transaxle Range Selector Lever PositionPossible Cause
Above specification in D, 2, and 1Forward clutch slipping.
Above specification in 2Intermediate/overdrive band slipping.
Above specification in 1 and RLow/reverse clutch slipping.
Above specification in RReverse clutch slipping.
Above specification in RCarry out road test to determine whether problem is in low/reverse clutch.
Above specification in RLow/reverse clutch is defective.

STALL SPEED DIAGNOSIS

Leakage Inspection

Special Tool(s)

Scheme 55

Scheme 55: Leakage Inspection
Scheme 55: Leakage Inspection
CAUTIONDo not try to stop the fluid leak by increasing the torque beyond specifications. This may cause damage to the case threads.

Check the fluid filler tube at the transaxle case. If leakage is found here, install a new plug.

Check fluid tubes and fittings between the transaxle and the cooler for looseness, wear or damage. If leakage cannot be stopped by tightening a fluid tube nut, install new parts.

If the leak continues, install a new cooler line fitting and tighten to specification. The same procedure should be followed for fluid leaks between the cooler and the cooler line fittings. For additional information, refer to TRANSAXLE/TRANSMISSION COOLING .

The cooler can be further checked for leaks. For additional information, refer to TRANSAXLE/TRANSMISSION COOLING .

If leakage is found at the transaxle range selector lever, install a new seal.

If leakage is found at the transaxle harness connector, install a new O-ring.

The transaxle has the following parts to prevent external fluid leakage

  1. sealer
  2. lip-type seals
  3. O-ring seals
  4. seal rings
  5. seal grommets
  6. thread sealant
  7. pan fluid

Scheme 56

Scheme 56: External Sealing
Scheme 56: External Sealing

Leak Check Test

  1. Original factory fill fluid is dyed red to aid in determining if leakage is from the engine or transaxle. The red color should assist in pinpointing the leak.
  2. Clean off any fluid from the top and bottom of the torque converter housing, of the case, and the rear face of the engine and oil pan. Clean the torque converter area by washing with a suitable nonflammable solvent and blow dry with compressed air.
  3. Wash out the torque converter housing, and the front of the flexplate. The torque converter housing may be washed out using cleaning solvent and a squirt-type oil can. Blow all washed areas dry with compressed air.
  4. Start and run the engine until the transaxle reaches its normal operating temperature. Observe the back of the cylinder block and the top of the torque converter housing for evidence of fluid leakage. Raise the vehicle on a hoist; refer to «JACKING & HOISTING»(ref-162603-S22452453972004060700000) and run the engine at fast idle, then at engine idle, occasionally shifting to the D and R positions to increase pressure within the transaxle. Observe the front of the flexplate, back of the cylinder block (in as far as possible), and inside the torque converter housing and front of the case. Run the engine until fluid leakage is evident and the probable source of leakage can be determined.

Leak Check Test With Black Light

Fluid soluble aniline or fluorescent dyes premixed at the rate of 2.5ml (1/2 teaspoon) of dye powder to 0.24L (1/2 pint) of automatic transaxle fluid have proven helpful in locating the source of fluid leakage. Such dyes may be used to determine whether an engine fluid or transaxle fluid leak is present. An ultraviolet light must be used to detect the fluorescent dye solution.

Transaxle Fluid Cooler Flow Test

For additional information, refer to TRANSAXLE/TRANSMISSION COOLING .

Diagnosis By Symptom Chart Directions

  1. Using the Symptom Index, select the Concern/Symptom that best describes the condition.
  2. Refer to the routine indicated in the «DIAGNOSIS BY SYMPTOM INDEX»(ref-207762-S11604443212005120200000) .
  3. Always begin diagnosis of a symptom with: Preliminary inspections. Verifications of condition. Checking the fluid levels.
  4. Begin with the Electrical Routine, if indicated. Follow the reference or action statements. Always carry out the on-board diagnostic tests as necessary. Never skip steps. If the concern is still present after electrical diagnosis, then proceed to the Hydraulic/Mechanical Routine listed.
  5. The Hydraulic/Mechanical Routines list possible hydraulic or mechanical components that could cause the concern. These components are listed in the removal sequence and by most probable cause. All components listed must be inspected to make sure of correct repair.

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