Automatic Transmission (Diagnostics), 2.5L: Other Saab 9-2X I

PROCEDURE

Note. This section is specified for H4SO engine (model).

CHECK AT OIL TEMP WARNING LIGHT

Turn the ignition switch to ON.

Does the AT OIL TEMP warning light illuminate?

YES. Go to CHECK INDICATION OF DTC .

NO. Go to CHECK AT OIL TEMP WARNING LIGHT .

Turn the ignition switch to OFF.

Repair the AT OIL TEMP warning light circuit or power supply and ground line circuit.

Turn the ignition switch to ON.

Is the AT OIL TEMP warning light illuminate?

YES. Go to CHECK INDICATION OF DTC .

NO. Go to PERFORM THE GENERAL DIAGNOSTICS .

BATTERY

Measure the battery voltage and specific gravity of electrolyte.

Standard voltage: 12 V or more

Specific gravity: Above 1.260

TRANSMISSION GROUND

Make sure that the ground terminal bolt is tightened securely.

Scheme 586

1. Chassis side Tightening torque: 13 Nm (1.3 kgf-m, 9.4 ft-lb)

ATF LEVEL

Make sure that ATF level is within the specification.

Scheme 587

1. Level gauge
2. "HOT" side
3. Upper level
4. Lower level
5. "COLD" side

FRONT DIFFERENTIAL OIL LEVEL

Make sure that front differential oil level is within the specification.

Scheme 588

1. Upper level
2. Lower level

GENERAL TOOL

GENERAL TOOL

CAUTION

1. Supplemental Restraint System "Airbag" The airbag system wiring harness is routed near the TCM. IMPORTANT: All airbag system wiring harness and connectors are colored yellow. Do not use an electrical test equipment on these circuit. Be careful not to damage the airbag system wiring harness when performing diagnostics and servicing the TCM.
2. Measurement

When measuring the voltage and resistance of ECM, TCM or each sensor, use a tapered pin with diameter of less than 0.64 mm (0.025 in) in order to avoid poor contact. Do not insert the pin more than 0.65 mm (0.026 in).

Scheme 589

Scheme 590

Scheme 591

Scheme 592

Scheme 593

1. Engine control module (ECM)
2. AT OIL TEMP warning light (AT warning light)
3. Transmission control module (TCM)
4. Data link connector

Scheme 594

Scheme 595

Scheme 596

Scheme 597

Scheme 598

Scheme 599

Scheme 600

1. Throttle position sensor
2. Front vehicle speed sensor
3. Inhibitor switch
4. Rear vehicle speed sensor
5. Torque converter turbine speed sensor
6. ATF temperature sensor

Scheme 601

1. Line pressure linear solenoid
2. High clutch duty solenoid
3. 2-4 brake duty solenoid
4. Low & reverse duty solenoid
5. Low clutch duty solenoid
6. Transfer duty solenoid
7. Lock-up duty solenoid

Scheme 602

CONNECTOR TERMINALS REFERENCE

READ CURRENT DATA

On the << Main Menu >> display screen, select the {Each System Check}.

On the << System Selection Menu >> display screen, select the {Transmission Control System}.

Select the {OK} after the information of transmission type is displayed.

On the << Transmission Diagnosis >> display screen, select the {Current Data Display & Save}.

On the << Transmission Diagnosis >> display screen, select the {Data Display}.

Using the scroll key, move the display screen up or down until desired data is shown.

1. A list of the support data is shown in the following table.

VOLTAGE REFERENCE

Note. For detailed operation procedure, refer to the VEHICLE DIAGNOSTIC INTERFACE OPERATION MANUAL.

CLEAR MEMORY MODE

On the << Main Menu >> display screen, select the {2. Each System Check}.

On the << System Selection Menu >> display screen, select the {Transmission Control System}.

Select the {OK} after the information of transmission type is displayed.

On the << Transmission Diagnosis >> display screen, select the {Clear Memory}.

When the "Done" is shown on display screen, turn the Vehicle Diagnostic Interface and ignition switch to OFF.

Note. For detailed operation procedure, refer to the VEHICLE DIAGNOSTIC INTERFACE OPERATION MANUAL. When {Clear Memory 2} is selected and executed, DTC and learned control memory is cleared. If Clear Memory 2 is performed, execute the learning control.

FACILITATION OF LEARNING CONTROL

Shift the select lever to "P" range, and apply parking brake.

Lift-up the vehicle.

Connect the Vehicle Diagnostic Interface to data link connector, and then turn the ignition switch to ON.

Perform the {Clear Memory 2} using Vehicle Diagnostic Interface.

Using Vehicle Diagnostic Interface, check that the DTC is not output.

Warm-up the engine until the ATF temperature which is displayed on the Vehicle Diagnostic Interface is within 60 - 90°C (140 - 194°F).

Shift the select lever to "R" range.

Turn all switches including headlight, air conditioner, seat heater, rear defogger and etc. to OFF.

Turn the ignition switch to OFF.

Depress the brake pedal fully until the facilitation of learning control is completed when the "Communication Failed!" is displayed on Vehicle Diagnostic Interface.

Turn the ignition switch to ON.

Read the current data to check that the Vehicle Diagnostic Interface is returned to normal operation.

Shift the select lever to "P" range, and then wait for more than 3 seconds.

Shift the select lever to "R" range, and then wait for more than 3 seconds.

Shift the select lever to "N" range, and then wait for more than 3 seconds.

Shift the select lever to "D" range, and then wait for more than 3 seconds.

Shift the select lever to "N" range, and then wait for more than 3 seconds.

Slowly depress the accelerator pedal fully.

Slowly release the accelerator pedal fully.

Start the engine, and idle it.

Shift the select lever to "D" range.

Start the facilitation of learning control. At this time, the AT OIL TEMP warning light in combination meter blinks at 2 Hz. When the AT OIL TEMP warning light does not blink, turn the ignition switch to OFF and repeat the procedures from step 4). When the AT OIL TEMP warning light which blinking at 2 Hz changes to blink at 0.5 Hz, facilitation of learning control is completed.

Note. When blinking of AT OIL TEMP warning light changes from 2 Hz to 4 Hz during facilitation of learning control, repeat the procedure from step 4).

Shift the select lever to "N" range, and then turn the ignition switch to OFF.

Shift the select lever to the "P" range, and then complete the facilitation of learning control.

CHECK FUSE (No. 13)

Remove the fuse (No. 13).

Is the fuse (No. 13) blown out?

YES

Replace the fuse (No. 13). If replaced fuse (No. 13) is blown out easily, repair short circuit in harness between fuse (No. 13) and combination meter.

NO. Go to CHECK HARNESS CONNECTOR BETWEEN COMBINATION METER AND IGNITION SWITCH .

CHECK COMBINATION METER

Measure the resistance between combination meter connector and chassis ground.

Connector & terminal

(i10) No. 5 (+) - Chassis ground ( - )

Is the resistance less than 1 MO?

YES. Go to CHECK INPUT SIGNAL FOR TCM .

NO

Repair the ground short circuit in harness between TCM and combination meter.

CHECK INPUT SIGNAL FOR TCM

Connect the connector to combination meter.

Turn the ignition switch to ON (engine OFF).

Measure the voltage between TCM connector and chassis ground.

Connector & terminal

(B56) No. 13 (+) - Chassis ground (- )

Is the voltage less than 9 V?

YES

Replace the TCM.

NO

Replace the combination meter.

COMMUNICATION FOR INITIALIZING IMPOSSIBLE

DIAGNOSIS

1. Faulty harness connector

TROUBLE SYMPTOM

1. Vehicle Diagnostic Interface communication failure

WIRING DIAGRAM

Scheme 603

CHECK OUTPUT SIGNAL FOR TCM

Turn the ignition switch to ON.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B40) No. 10 (+) - Chassis ground (- )

Is the voltage more than 1 V?

YES

Repair the harness and connector between each control module and data link connector.

NO. Go to CHECK HARNESS/CONNECTOR BETWEEN TCM AND DATA LINK CONNECTOR .

CHECK POOR CONTACT IN CONNECTORS

There is poor contact. Is there poor contact in control module and data link connector?

YES

Repair the poor contact.

NO. Go to CHECK IGNITION POWER SUPPLY CIRCUIT .

CHECK IGNITION POWER SUPPLY CIRCUIT

Turn the ignition switch to ON (engine OFF).

Measure the ignition power supply voltage between TCM connector and chassis ground.

Connector & terminal

(B55) No. 27 (+) - Chassis ground (- )

(B55) No. 28 (+) - Chassis ground (- )

(B55) No. 29 (+) - Chassis ground (- )

Is the voltage 10 - 13 V?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION .

NO. Go to CHECK FUSE (No. 11) .

CHECK FUSE (No. 11)

Remove the fuse (No. 11).

Is the fuse (No. 11) blown out?

YES

Replace the fuse (No. 11). If replaced fuse (No. 11) has blown out easily, repair short circuit in harness between fuse (No. 11) and TCM.

NO

Repair the open circuit in harness between fuse (No. 11) and TCM, or fuse (No. 11) and battery, and poor contact in coupling connector.

Is there poor contact in TCM power supply, ground line and data link connector?

YES

Repair the connector.

NO

Replace the TCM.

CHECK "P" RANGE SWITCH

When the "P" range is selected, does LED light up?

YES. Go to CHECK INDICATOR LIGHT .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN INHIBITOR SWITCH AND CHASSIS GROUND .

CHECK INDICATOR LIGHT

Does the combination meter "P" range indicator illuminate?

YES. Go to CHECK "P" RANGE SWITCH .

NO. Go to CHECK "P" RANGE INDICATOR LIGHT BULB .

When the "R" range is selected, does "P" range LED light up?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

NO. Go to CHECK "R" RANGE SWITCH .

CHECK "R" RANGE SWITCH

When the "R" range is selected, does LED light up?

YES. Go to CHECK INDICATOR LIGHT .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

Does the combination meter "R" range indicator illuminate?

YES. Go to CHECK "R" RANGE SWITCH .

NO. Go to CHECK "R" RANGE INDICATOR LIGHT BULB .

When the "N" range is selected, does "R" range LED light up?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

NO. Go to CHECK "N" RANGE SWITCH .

CHECK "N" RANGE SWITCH

When the "N" range is selected, does LED light up?

YES. Go to CHECK INDICATOR LIGHT .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

Does the combination meter "N" range indicator illuminate?

YES. Go to CHECK "N" RANGE SWITCH .

NO. Go to CHECK "N" RANGE INDICATOR LIGHT BULB .

When the "D" range is selected, does "N" range LED light up?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

NO. Go to CHECK "D" RANGE SWITCH .

CHECK "D" RANGE SWITCH

When the "D" range is selected, does LED light up?

YES. Go to CHECK INDICATOR LIGHT .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

Does the combination meter "D" range indicator illuminate?

YES. Go to CHECK "D" RANGE SWITCH .

NO. Go to CHECK "D" RANGE INDICATOR LIGHT BULB .

When the "3" range is selected, does "D" range LED light up?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

NO. Go to CHECK "3" RANGE SWITCH .

CHECK "3" RANGE SWITCH

When the "3" range is selected, does LED light up?

YES. Go to CHECK INDICATOR LIGHT .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

Does the combination meter "3" range indicator illuminate?

YES. Go to CHECK "3" RANGE SWITCH .

NO. Go to CHECK "3" RANGE INDICATOR LIGHT BULB .

When the "2" range is selected, does "3" range LED light up?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

NO. Go to CHECK "2" RANGE SWITCH .

CHECK "2" RANGE SWITCH

When the "2" range is selected, does LED light up?

YES. Go to CHECK INDICATOR LIGHT .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

Does the combination meter "2" range indicator illuminate?

YES. Go to CHECK "2" RANGE SWITCH .

NO. Go to CHECK "2" RANGE INDICATOR LIGHT BULB .

When the "1" range is selected, does "2" range LED light up?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

NO. Go to CHECK "1" RANGE SWITCH .

CHECK "1" RANGE SWITCH

When the "1" range is selected, does LED light up?

YES. Go to CHECK INDICATOR LIGHT .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

Does the combination meter "1" range indicator illuminate?

YES. Go to CHECK "1" RANGE SWITCH .

NO. Go to CHECK "1" RANGE INDICATOR LIGHT BULB .

When the "2" range is selected, does "1" range LED light up?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND INHIBITOR SWITCH .

NO

Replace the TCM.

Turn the ignition switch to OFF.

Connect the connector to TCM and inhibitor switch.

Turn the ignition switch to ON.

Move the select lever to "P" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 5 (+) - Chassis ground (- )

Is the voltage less than 1 V?

YES. Go to CHECK INPUT SIGNAL FOR TCM .

NO. Go to CHECK POOR CONTACT .

Move the select lever except for "P" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 5 (+) - Chassis ground (- )

Is the voltage more than 8 V?

YES. Go to CHECK POOR CONTACT .

NO

Replace the TCM.

CHECK "P" RANGE INDICATOR LIGHT BULB

Turn the ignition switch to OFF.

Remove the combination meter.

Is the "P" range indicator light OK?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER .

NO

Replace the combination meter.

Turn the ignition switch to OFF.

Connect the connector to TCM and inhibitor switch.

Turn the ignition switch to ON.

Move the select lever to "R" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 14 (+) - Chassis ground (- )

Is the voltage less than 1 V?

YES. Go to CHECK INPUT SIGNAL FOR TCM .

NO. Go to CHECK POOR CONTACT .

Move the select lever except for "R" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 14 (+) - Chassis ground (- )

Is the voltage more than 8 V?

YES. Go to CHECK POOR CONTACT .

NO

Replace the TCM.

CHECK "R" RANGE INDICATOR LIGHT BULB

Turn the ignition switch to OFF.

Remove the combination meter.

Is "R" range indicator light OK?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER .

NO

Replace the combination meter.

Turn the ignition switch to OFF.

Connect the connector to TCM and inhibitor switch.

Turn the ignition switch to ON.

Move the select lever to "N" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 22 (+) - Chassis ground (- )

Is the voltage less than 1 V?

YES. Go to CHECK INPUT SIGNAL FOR TCM .

NO. Go to CHECK POOR CONTACT .

Move the select lever to except for "N" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 22 (+) - Chassis ground (- )

Is the voltage more than 8 V?

YES. Go to CHECK POOR CONTACT .

NO

Replace the TCM.

CHECK "N" RANGE INDICATOR LIGHT BULB

Turn the ignition switch to OFF.

Remove the combination meter.

Is the "N" range indicator light OK?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER .

NO

Replace the combination meter.

Turn the ignition switch to OFF.

Connect the connector to TCM and inhibitor switch.

Turn the ignition switch to ON.

Move the select lever to "D" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 4 (+) - Chassis ground (- )

Is the voltage less than 1 V?

YES. Go to CHECK INPUT SIGNAL FOR TCM .

NO. Go to CHECK POOR CONTACT .

Move the select lever except for "D" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B55) No. 4 (+) - Chassis ground (- )

Is the voltage more than 8 V?

YES. Go to CHECK POOR CONTACT .

NO

Replace the TCM.

CHECK "D" RANGE INDICATOR LIGHT BULB

Turn the ignition switch to OFF.

Remove the combination meter.

Is the "D" range indicator light OK?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER .

NO

Replace the combination meter.

Turn the ignition switch to OFF.

Connect the connector to TCM and inhibitor switch.

Turn the ignition switch to ON.

Move the select lever to "3" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B54) No. 15 (+) - Chassis ground (- )

Is the voltage less than 1 V?

YES. Go to CHECK INPUT SIGNAL FOR TCM .

NO. Go to CHECK POOR CONTACT .

Move the select lever except for "3" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B54) No. 15 (+) - Chassis ground (- )

Is the voltage more than 8 V?

YES. Go to CHECK POOR CONTACT .

NO

Replace the TCM.

CHECK "3" RANGE INDICATOR LIGHT BULB

Turn the ignition switch to OFF.

Remove the combination meter.

Is the "3" range indicator light OK?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER .

NO

Replace the combination meter.

Turn the ignition switch to OFF.

Connect the connector to TCM and inhibitor switch.

Turn the ignition switch to ON.

Move the select lever to "2" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B54) No. 4 (+) - Chassis ground (- )

Is the voltage less than 1 V?

YES. Go to CHECK INPUT SIGNAL FOR TCM .

NO. Go to CHECK POOR CONTACT .

Move the select lever except for "2" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B54) No. 4 (+) - Chassis ground (- )

Is the voltage more than 8 V?

YES. Go to CHECK POOR CONTACT .

NO

Replace the TCM.

CHECK "2" RANGE INDICATOR LIGHT BULB

Turn the ignition switch to OFF.

Remove the combination meter.

Is the "2" range indicator light OK?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER .

NO

Replace the combination meter.

Turn the ignition switch to OFF.

Connect the connector to TCM and inhibitor switch.

Turn the ignition switch to ON.

Move the select lever to "1" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B54) No. 10 (+) - Chassis ground (- )

Is the voltage less than 1 V?

YES. Go to CHECK INPUT SIGNAL FOR TCM .

NO. Go to CHECK POOR CONTACT .

Move the select lever except for "1" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B54) No. 10 (+) - Chassis ground (- )

Is the voltage more than 8 V?

YES. Go to CHECK POOR CONTACT .

NO

Replace the TCM.

CHECK "1" RANGE INDICATOR LIGHT BULB

Turn the ignition switch to OFF.

Remove the combination meter.

Is the "1" range indicator light OK?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER .

NO

Replace the combination meter.

CHECK POOR CONTACT

Is there poor contact in inhibitor switch circuit?

YES

Repair the poor contact.

NO. Go to CHECK INHIBITOR SWITCH .

CHECK INHIBITOR SWITCH

Is the inhibitor switch in proper position?

YES

Replace the TCM.

NO

Adjust the inhibitor switch and select cable. and

CHECK ATF TEMPERATURE SENSOR

Turn the ignition switch to OFF.

Connect the connectors to transmission and TCM.

Turn the ignition switch to ON and start engine.

Warm-up the transmission until ATF temperature reaches to 80°C (176°F).

Note. If ambient temperature is below 0 °C (32°F), drive the vehicle until ATF reaches its operating temperature.

Disconnect the connector from transmission.

Measure the resistance between transmission connector terminals.

Connector & terminal

(T4) No. 11 - No. 15

Is the resistance 300 - 800 O?

YES. Go to CHECK ATF TEMPERATURE SENSOR .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND ATF TEMPERATURE SENSOR .

Measure the resistance between transmission connector terminals.

Connector & terminal

(T4) No. 11 - No. 15

Does the resistance value increase when ATF temperature decreases?

YES. Go to CHECK INPUT SIGNAL FOR TCM USING VEHICLE DIAGNOSTIC INTERFACE .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND ATF TEMPERATURE SENSOR .

Is there poor contact in ATF temperature sensor circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

Measure the resistance between transmission connector terminals.

Connector & terminal

(T4) No. 11 - No. 15

Is the resistance more than 500 O?

YES

Even if the AT OIL TEMP warning light is blinking, the circuit has returned to normal condition at this time. A temporary short circuit of connector or harness may be the cause. Repair the harness or connector.

NO. Go to CHECK TRANSMISSION HARNESS. .

Measure the resistance between control valve connector terminals

Terminal

No. 1 - No. 3

Is the resistance more than 500 O?

YES

Even if the AT OIL TEMP warning light is blinking, the circuit has returned to normal condition at this time. A temporary short circuit of connector or harness may be the cause. Repair the harness or connector.

NO

Replace the control valve body.

Is there poor contact in torque converter turbine speed sensor circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

CHECK TCM INPUT SIGNAL

Depress the brake pedal.

Measure the voltage of harness between TCM and stop light switch.

Connector & terminal

(B55) No. 20 (+) - Chassis ground (- )

Is the voltage more than 10 V?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM BRAKE LIGHT SWITCH .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TCM BRAKE LIGHT SWITCH .

Turn the ignition switch to OFF.

Disconnect the connector from TCM and stop light switch.

Measure the resistance between TCM and stop light switch.

Connector & terminal

(B55) No. 20 - (B65) No. 3

Is the resistance less than 1 O?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM BRAKE LIGHT SWITCH .

NO

Repair the open harness between TCM and stop light switch.

CHECK FRONT VEHICLE SPEED SENSOR

Measure the resistance between transmission connector receptacle's terminals.

Connector & terminal

(T4) No. 14 - No. 18

Is the resistance 450 - 650 O?

YES. Go to CHECK INPUT SIGNAL FOR TCM USING VEHICLE DIAGNOSTIC INTERFACE. .

NO

Replace the front vehicle speed sensor.

Is there poor contact in front vehicle speed sensor circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

Disconnect the harness connector from TCM.

Measure the voltage of harness between TCM and stop light switch.

Connector & terminal

(B55) No. 20 (+) - Chassis ground (- )

Is the voltage more than 10 V?

YES. Go to CHECK STOP LIGHT SWITCH .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND STOP LIGHT SWITCH .

CHECK STOP LIGHT SWITCH

Turn the ignition switch OFF.

Disconnect the connector from stop light switch.

Measure the resistance between stop light switch connector.

Connector & terminal

No. 2 - No. 3

Is the resistance more than 1 MO?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND STOP LIGHT SWITCH .

NO

Replace the stop light switch.

Is there poor contact in engine speed signal circuit?

YES

Repair the poor contact.

NO. Go to CONFIRM DTC P0725 .

CHECK THROTTLE POSITION SENSOR

Connect the Vehicle Diagnostic Interface to data link connector.

Turn the ignition switch to ON.

Read the value of accelerator pedal position sensor.

Does the value of accelerator pedal position sensor change from 0% to 100% smoothly when throttle position sensor was operated from fully closing to fully opening?

YES. Go to FRONT VEHICLE SPEED SENSOR .

NO

Check throttle position sensor.

FRONT VEHICLE SPEED SENSOR

Lift-up the vehicle and place rigid racks.

Start the engine.

Move the select lever "D" range and slowly increase vehicle speed.

Note. The speed difference between front and rear wheels may light ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system.

Does the vehicle speed displayed by Vehicle Diagnostic Interface almost correspond with vehicle speed indicated by combination meter?

YES. Go to CHECK TORQUE CONVERTER TURBINE SPEED SENSOR .

NO

Check the front vehicle speed sensor.

CHECK LOCK UP DUTY SOLENOID CIRCUIT

Check according as DTC P0743 procedure.

Is there a malfunction?

YES

Repair or replace the lock up duty solenoid circuit.

NO. Go to CHECK INHIBITOR SWITCH CIRCUIT .

CHECK INHIBITOR SWITCH CIRCUIT

Check according as DTC P0705 procedure.

Is there malfunction?

YES

Repair or replace the inhibitor switch circuit.

NO. Go to CHECK BRAKE LIGHT SWITCH CIRCUIT .

CHECK BRAKE LIGHT SWITCH CIRCUIT

Check according as DTC P0719 and DTC P0724 procedure.

Is there malfunction?

YES

Repair or replace the stop light switch circuit.

NO. Go to CHECK ATF TEMPERATURE SENSOR CIRCUIT .

CHECK ATF TEMPERATURE SENSOR CIRCUIT

Check according to DTC P0712 and DTC P0713 procedure.

Is there malfunction?

YES

Repair or replace the ATF temperature circuit.

NO. Go to CHECK THROTTLE POSITION SENSOR .

Connect the Vehicle Diagnostic Interface to data link connector.

Turn the ignition switch to ON.

Read the value of accelerator pedal position sensor.

Does the value of accelerator pedal position sensor change from 0% to 100% smoothly when throttle position sensor was operated from fully closing to fully opening?

YES. Go to CHECK TORQUE CONVERTER TURBINE SPEED SENSOR .

NO

Check the throttle position sensor circuit.

CHECK ENGINE SPEED SIGNAL

Idle the engine.

Does the engine revolution displayed by Vehicle Diagnostic Interface almost correspond with engine revolution indicated by tachometer?

YES

There is malfunction in TCM, TCM connector poor contact, or transmission assembly mechanical malfunction.

NO

Check the engine speed signal circuit.

CHECK LOCK-UP DUTY SOLENOID

Measure the resistance between transmission connector receptacle's terminals.

Connector & terminal

(T4) No. 12 - No. 20

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN LOCK-UP DUTY SOLENOID AND TRANSMISSION .

NO. Go to CHECK LOCK-UP DUTY SOLENOID (IN TRANSMISSION) .

CHECK LOCK-UP DUTY SOLENOID (IN TRANSMISSION)

Disconnect the transmission connector.

Drain the ATF.

Remove the oil pan and disconnect connector from lock-up duty solenoid.

Measure the resistance between lock-up duty solenoid and transmission ground.

Connector & terminal

(AT12) No. 4 - Transmission ground

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN LOCK-UP DUTY SOLENOID AND TRANSMISSION .

NO

Replace the control valve body.

CHECK LINE PRESSURE LINEAR SOLENOID

Measure the resistance between transmission connector receptacle's terminals.

Connector & terminal

(T4) No. 1 - No. 2

Is the resistance 4 - 8 O?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND LINE PRESSURE LINEAR SOLENOID .

NO. Go to CHECK LINE PRESSURE LINEAR SOLENOID (IN TRANSMISSION) .

CHECK LINE PRESSURE LINEAR SOLENOID (IN TRANSMISSION)

Remove the transmission connector from bracket.

Drain the ATF.

Remove the oil pan, and disconnect connector from line pressure linear solenoid.

Measure the resistance between line pressure linear solenoid connector and transmission ground.

Connector & terminal

(AT11) No. 2 - No. 4

Is the resistance 4 - 8 O?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND LINE PRESSURE LINEAR SOLENOID .

NO

Replace the control valve body.

CHECK LOW CLUTCH DUTY

Measure the resistance between transmission connector terminals.

Connector & terminal

(T4) No. 4 - No. 20

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK OUTPUT SIGNAL FROM TCM USING VEHICLE DIAGNOSTIC INTERFACE .

NO. Go to CHECK LOW CLUTCH DUTY SOLENOID (IN TRANSMISSION) .

Is there poor contact in low clutch duty solenoid circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

CHECK LOW CLUTCH DUTY SOLENOID (IN TRANSMISSION)

Remove the transmission connector from bracket.

Drain the ATF.

Remove the oil pan, and disconnect connector from low clutch duty solenoid.

Measure the resistance between low clutch duty solenoid connector and transmission ground.

Connector & terminal

(AT12) No. 2 - Transmission ground

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND LOW CLUTCH DUTY SOLENOID .

NO

Replace the control valve body.

CHECK 2-4 BRAKE DUTY SOLENOID

Measure the resistance between transmission connector terminals.

Connector & terminal

(T4) No. 3 - No. 20

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK OUTPUT SIGNAL FROM TCM USING VEHICLE DIAGNOSTIC INTERFACE .

NO. Go to CHECK 2-4 BRAKE DUTY SOLENOID (IN TRANSMISSION) .

Is there poor contact in 2-4 brake duty solenoid circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

CHECK 2-4 BRAKE DUTY SOLENOID (IN TRANSMISSION)

Remove the transmission connector from bracket.

Drain the ATF.

Remove the oil pan, and disconnect connector from 2-4 brake duty solenoid.

Measure the resistance between 2-4 brake duty solenoid connector and transmission ground.

Connector & terminal

(AT12) No. 6 - Transmission ground

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN 2-4 BRAKE DUTY SOLENOID AND TRANSMISSION .

NO

Replace the control valve body.

CHECK HIGH CLUTCH DUTY SOLENOID

Measure the resistance between transmission connector receptacle's terminals.

Connector & terminal

(T4) No. 7 - No. 20

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK OUTPUT SIGNAL FROM TCM USING VEHICLE DIAGNOSTIC INTERFACE .

NO. Go to CHECK HIGH CLUTCH DUTY SOLENOID (IN TRANSMISSION) .

Is there poor contact in high clutch duty circuit?

YES

Repair poor contact.

NO

Replace the TCM.

CHECK HIGH CLUTCH DUTY SOLENOID (IN TRANSMISSION)

Remove the transmission connector from bracket.

Drain the ATF.

Remove the oil pan and disconnect connector from high clutch duty solenoid.

Measure the resistance between high clutch duty solenoid connector and transmission ground.

Connector & terminal

(AT12) No. 3 - Transmission ground

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN HIGH CLUTCH DUTY SOLENOID AND TRANSMISSION .

NO

Replace the control valve body.

CHECK LOW & REVERSE BRAKE DUTY SOLENOID

Measure the resistance between transmission connector receptacle's terminals.

Connector & terminal

(T4) No. 6 - No. 20

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK OUTPUT SIGNAL FROM TCM USING VEHICLE DIAGNOSTIC INTERFACE .

NO. Go to CHECK LOW & REVERSE BRAKE DUTY SOLENOID (IN TRANSMISSION) .

Is there poor contact in low & reverse duty solenoid circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

CHECK LOW & REVERSE BRAKE DUTY SOLENOID (IN TRANSMISSION)

Remove the transmission connector from bracket.

Drain the ATF.

Remove the oil pan, and disconnect connector from low & reverse duty solenoid.

Measure the resistance between low & reverse duty solenoid connector and transmission ground.

Connector & terminal

(AT12) No. 1 - Transmission ground

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TRANSMISSION AND LOW & REVERSE DUTY SOLENOID .

NO

Replace the low & reverse brake duty solenoid.

CHECK SHIFT LOCK SOLENOID

Measure the resistance between shift lock solenoid.

Connector & terminal

(B117) No. 5 - No. 4

Is the resistance 20 - 40 O?

YES. Go to CHECK TCM OUTPUT SIGNAL .

NO

Replace the shift lock solenoid.

CHECK TCM OUTPUT SIGNAL

Connect all connectors.

Turn the ignition switch to ON.

Move the select lever to "D" range.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B56) No. 18 (+) - Chassis ground (- )

Is the voltage more than 10.5 V?

YES. Go to CHECK OUTPUT SIGNAL FROM TCM .

NO. Go to CHECK POOR CONTACT .

CHECK OUTPUT SIGNAL FROM TCM

Lift-up the vehicle and place rigid racks.

Note. Raise all wheels off ground.

Start the engine.

Move the select lever "D" range and slowly increase vehicle speed to 20 km/h (12 MPH).

Note. The speed difference between front and rear wheels may light ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system.

Measure the voltage between TCM and chassis ground.

Connector & terminal

(B56) No. 18 (+) - Chassis ground (- )

Is the voltage less than 1 V?

YES

Even if the POWER indicator blinks, the circuit has returned to a normal condition at this time. A temporary poor contact of the connector or harness may be cause. Repair the harness or connector in reverse inhibitor control circuit.

NO. Go to CHECK POOR CONTACT .

Is there poor contact in the reverse inhibitor control circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

Turn the ignition switch to OFF.

Disconnect the connector from rear vehicle speed sensor.

Turn the ignition switch to ON.

Measure the ignition power supply between rear vehicle speed sensor connector and transmission ground.

Connector & terminal

(AT10) No. 3 (+) - Transmission ground (- )

Is the voltage more than 10 V?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND TRANSMISSION .

NO

Check harness between rear vehicle speed sensor and battery for open circuit, short or poor contact. Repair the harness if required.

PREPARE OSCILLOSCOPE

Do you have an oscilloscope?

YES. Go to CHECK INPUT SIGNAL FOR TCM .

NO. Go to CHECK INPUT SIGNAL FOR TCM .

Connect the connectors to TCM and transmission.

Lift-up the vehicle and place rigid racks.

Note. Raise all wheels off ground.

Start the engine and set vehicle in 20 km/h (12 MPH) condition.

Note. The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system.

Measure the AC voltage between TCM connector terminals.

Connector & terminal

(B55) No. 24 (+) - No. 23 (- )

Is the voltage more than 2 V?

YES. Go to CHECK POOR CONTACT .

NO

Replace the rear vehicle speed sensor.

CHECK INPUT SIGNAL FOR TCM USING OSCILLOSCOPE

Connect the connectors to TCM and transmission.

Lift-up the vehicle and place rigid racks.

Note. Raise all wheels off ground.

Set the oscilloscope to TCM connector terminals.

Connector & terminal

Positive probe; (B55) No. 24

Earth lead; (B55) No. 23

Start the engine and set vehicle in 20 km/h (12 MPH) condition.

Note. The speed difference between front and rear wheels may light the ABS warning light, but this indicates no malfunction. When AT control diagnosis is finished, perform the ABS memory clearance procedure of on-board diagnostics system.

Measure the signal voltage indicated on oscilloscope.

Is the pulse voltage approx. 5 V?

YES. Go to CHECK POOR CONTACT .

NO

Replace the rear vehicle speed sensor.

Is there poor contact in rear vehicle speed sensor circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

CHECK TRANSFER DUTY SOLENOID

Measure the resistance between transmission connector and transmission terminals.

Connector & terminal

(T4) No. 8 - No. 20

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TRANSFER DUTY SOLENOID AND TRANSMISSION .

NO. Go to CHECK TRANSFER DUTY SOLENOID (IN TRANSMISSION) .

CHECK TRANSFER DUTY SOLENOID (IN TRANSMISSION)

Lift-up the vehicle and place rigid racks.

Note. Raise all wheels off ground.

Drain the automatic transmission fluid.

Remove the extension case and disconnect connector from transfer duty solenoid.

Measure the resistance between transfer duty solenoid connector and transmission ground.

Connector & terminal

(AT12) No. 5 - Transmission ground

Is the resistance 2.0 - 6.0 O?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TRANSFER DUTY SOLENOID AND TRANSMISSION .

NO

Replace the control valve body.

CHECK ENGINE GROUND TERMINALS

Have engine ground terminals been tightened?

YES. Go to CHECK GROUND CIRCUIT OF ECM .

NO

Tighten the engine ground terminals.

CHECK GROUND CIRCUIT OF ECM

Turn the ignition switch to OFF.

Disconnect the connector from ECM.

Measure the resistance of harness between ECM and engine ground.

Connector & terminal

(B134) No. 7 - Engine ground

(B134) No. 6 - Engine ground

(B135) No. 1 - Engine ground

(B135) No. 4 - Engine ground

(B135) No. 12 - Engine ground

(B137) No. 1 - Engine ground

(B137) No. 2 - Engine ground

(B137) No. 3 - Engine ground

(B137) No. 7 - Engine ground

Is the resistance less than 5 O?

YES. Go to CHECK ACCELERATOR PEDAL POSITION SENSOR .

NO

Repair the open circuit in harness between ECM connector and engine grounding terminal.

CHECK ACCELERATOR PEDAL POSITION SENSOR

Disconnect the connector from accelerator pedal position sensor.

Measure the resistance between accelerator pedal position sensor connector receptacle's terminals.

Connector & terminal

No. 1 - No. 6

Is the resistance 0.5 - 4.5 kO?

YES. Go to CHECK ACCELERATOR PEDAL POSITION SENSOR .

NO

Replace the accelerator pedal position sensor.

Measure the resistance between accelerator pedal position sensor connector receptacle's terminals.

Connector & terminal

No. 2 - No. 6

Is the resistance 0.5 - 4.5 kO?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND ACCELERATOR PEDAL POSITION SENSOR .

NO

Replace the accelerator pedal position sensor.

Is there poor contact in accelerator pedal position sensor circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

Have engine ground terminals been tightened securely?

YES. Go to CHECK GROUND CIRCUIT OF ECM .

NO

Tighten the engine ground terminals.

Turn the ignition switch to OFF.

Disconnect the connector from ECM.

Measure the resistance of harness between ECM and engine ground.

Connector & terminal

(B134) No. 7 - Engine ground

(B134) No. 6 - Engine ground

(B135) No. 1 - Engine ground

(B135) No. 4 - Engine ground

(B135) No. 12 - Engine ground

(B137) No. 1 - Engine ground

(B137) No. 2 - Engine ground

(B137) No. 3 - Engine ground

(B137) No. 7 - Engine ground

Is the resistance less than 5 O?

YES. Go to CHECK ACCELERATOR PEDAL POSITION SENSOR .

NO

Repair the open circuit in harness between ECM connector and engine grounding terminal.

Disconnect the connector from accelerator pedal position sensor.

Measure the resistance between accelerator pedal position sensor connector receptacle's terminals.

Connector & terminal

No. 1 - No. 6

Is the resistance 0.5 - 4.5 kO?

YES. Go to CHECK ACCELERATOR PEDAL POSITION SENSOR .

NO

Replace the accelerator pedal position sensor.

Measure the resistance between accelerator pedal position sensor connector receptacle's terminals.

Connector & terminal

No. 6 - No. 2

Is the resistance 0.5 - 4.5 kO?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND ACCELERATOR PEDAL POSITION SENSOR .

NO

Replace the accelerator pedal position sensor.

Is there poor contact in accelerator pedal position sensor circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

Is there poor contact in throttle position sensor circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

CHECK SPARE FUSE

Is the spare fuse OK?

YES. Go to CHECK FWD SWITCH .

NO

Replace the fuse.

CHECK FWD SWITCH

Connect the Vehicle Diagnostic Interface to data link connector.

When the fuse is inserted to FWD switch, does the LED light up?

YES. Go to CHECK COMBINATION METER .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND FWD SWITCH .

Does the FWD indicator light illuminate?

YES

Go to INSPECTION FOR CRUISE CONTROL SWITCH .

NO. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER .

Turn the ignition switch to OFF.

Connect the connector to TCM.

Turn the ignition switch to ON.

Measure the signal voltage for TCM while installing the fuse to FWD switch connector.

Connector & terminal

(B56) No. 17 (+) - Chassis ground (- )

Is the voltage less than 1 V?

YES. Go to CHECK INPUT SIGNAL FOR TCM .

NO. Go to CHECK OUTPUT SIGNAL EMITTED FROM TCM .

Measure the signal voltage for TCM while removing the fuse from FWD switch connector.

Connector & terminal

(B56) No. 17 (+) - Chassis ground (- )

Is the voltage 6 - 9.1 V?

YES. Go to CHECK HARNESS CONNECTOR BETWEEN TCM AND COMBINATION METER .

NO

Replace the TCM.

CHECK OUTPUT SIGNAL EMITTED FROM TCM

Turn the ignition switch to OFF.

Connect the connector to TCM and combination meter.

Turn the ignition switch to ON.

Measure the signal voltage for TCM while installing the fuse to FWD switch connector.

Connector & terminal

(B56) No. 14 (+) - Chassis ground (- )

Is the voltage less than 1 V?

YES. Go to CHECK OUTPUT SIGNAL EMITTED FROM TCM .

NO. Go to CHECK POOR CONTACT .

Measure the signal voltage for TCM while removing the fuse from FWD switch connector.

Connector & terminal

(B56) No. 14 (+) - Chassis ground (- )

Is the voltage 6 - 9.1 V?

YES. Go to CHECK FUSE .

NO

Replace the TCM.

CHECK FUSE

Is the fuse OK?

YES. Go to CHECK POOR CONTACT .

NO

Replace the fuse.

Is there poor contact in FWD switch circuit?

YES

Repair the poor contact.

NO

Replace the TCM.

CHECK CRUISE CONTROL SWITCH

CHECK CRUISE CONTROL SWITCH.

When the cruise control is set, does LED light up?

YES

Go to step CHECK INHIBITOR SWITCH.

NO

Check the cruise control.