Automatic Transmission: Diagnosis Suzuki Forenza I

Cooler Flushing and Flow Test

After filling the transaxle with fluid, start the engine and run for 30 seconds. This will remove any residual moisture from the oil cooler. Disconnect the return line at the transaxle and observe the flow with the engine running. If the fluid flow is insufficient, check the fluid flow by disconnecting the feed line at the cooler. Observe the flow with the engine running.

1. If the flow from the cooler return line at the transaxle is insufficient, check the flow rate from the feed line to the cooler. Blockage exists in the transaxle or the cooler.
2. If the flow from the transaxle feed line to the cooler is insufficient, the transaxle is the cause of the fluid flow problem.
3. If the flow the transaxle feed line to the cooler is insufficient, but flow from the cooler return line to the transaxle is insufficient, inspect the cooler pipes and fittings. Then repeat the cooler flushing procedure. If the flow is still insufficient, replace the cooler.

Fluid Level Diagnosis Procedure

1. If the vehicle is at operating temperature allow the vehicle to cool down for two hours, but no greater than four hours. Or if the vehicle is at cool status, start the engine and allow the engine to idle for approximately 5 minutes (825 - 875 RPM), if possible, drive the vehicle for a few km (N - D, N - R, shift until two gear). This will allow the transaxle to be within the correct temperature range. Transaxle fluid level should be checked at temperature 20 - 45 °C (68 - 113 °F).
2. Switch off accessories, especially air conditioner, heater.
3. With the brake pedal pressed, move the gear shift control lever through the gear ranges, pausing a few seconds in each range. Return the gearshift lever to P (Park). Turn the engine OFF.
4. Park the vehicle on a hoist, inspection pit or similar raised level surface. The vehicle must be level to obtain a correct fluid level measurement.
5. Place a fluid container below the fluid filler plug.
6. Clean all dirt from around the fluid filler plug. Remove the fluid filler plug. Clean the filler plug and check that there is no damage to the "O" ring. If fluid drains through the filler hole the transaxle may have been overfilled. When the fluid stops draining the fluid level is correct. Install the fluid filler plug and tighten it to 45 N.m (34 lb-ft). If fluid does not drain through the filler hole, the transaxle fluid level may be low. Lower the vehicle, and start the vehicle in P (Park) with the parking brake and the brake applied. With the engine idling, move the gear shift lever through the gear ranges, pausing a few seconds in each range and adding the fluid until gear application is felt. Return the gear shift lever to P (Park). Turn the engine OFF and raise the vehicle. Check if the fluid level is aligned with the bottom of the filler hole. If not, add a small quantity of fluid to the correct level. Install the fluid filler plug and tighten it to 45 N.m (34 lb-ft).
7. When the fluid level checking procedure is completed, wipe any fluid around the filler plug with a rag or shop towel.

Fluid Leak Diagnosis and Repair

The cause of most external leaks can generally be Located and repaired with the transaxle in the vehicle.

Electrical/Garage Shift Test

This preliminary test should be performed before a hoist or road test to make sure electronic control inputs is connected and operating. If the inputs are not checked before operating the transaxle, a simple electrical condition could be misdiagnosed as a major transaxle condition.

A scan tool provides valuable information and must be used on the automatic transaxle for accurate diagnosis.

1. Move gear selector to P (Park) and set the parking brake.
2. Connect scan tool to Data Link Connector (DLC) terminal.
3. Start engine.
4. Turn the scan tool ON.
5. Verify that the appropriate signals are present. These signals may include: ENGINE SPEED VEHICLE SPEED THROTTLE POSITION TRANSAXLE GEAR STATE GEAR SHIFT LEVER POSITION TRANSAXLE FLUID TEMPERATURE CLOSED THROTTLE POSITION LEARN OPEN THROTTLE POSITION LEARN CLOSED ACCEL. PEDAL POSITION LEARN OPEN ACCEL. PEDAL POSITION LEARN A/C COMPRESSOR STATUS MODE SWITCH THROTTLE POSITION VOLTAGE GEAR SHIFT LEVER POSITION VOLTAGE TRANS. FLUID TEMPERATURE VOLTAGE A/C SWITCH MODE SWITCH VOLTAGE BATTERY VOLTAGE
6. Monitor the A/C COMPRESSOR STATUS signal while pushing the A/C switch. The A/C COMPRESSOR STATUS should come ON when the A/C switch is pressed, and turns OFF when the A/C switch is repushed.
7. Monitor the GEAR SHIFT LEVER POSITION signal and move the gear shift control lever through all the ranges. Verify that the GEAR SHIFT LEVER POSITION value matches the gear range indicated on the instrument panel or console. Gear selections should be immediate and not harsh.
8. Move gear shift control lever to neutral and monitor the THROTTLE POSITION signal while increasing and decreasing engine speed with the accelerator pedal. THROTTLE POSITION should increase with engine speed.

Road Test

1. Perform the road test using a scan tool.
2. This test should be performed when traffic and road conditions permit.
3. Observe all traffic regulations.

The TCM calculates upshift points based primarily on two inputs: throttle angle and vehicle speed. When the TCM wants a shift to occur, an electrical signal is sent to the shift solenoids which in turn moves the valves to perform the upshift.

The shift speed charts reference throttle angle instead of "min throttle" or "wide open throttle" to make shift speed measurement more uniform and accurate. A scan tool should be used to monitor throttle angle. Some scan tools have been programmed to record shift point information. Check the introduction manual to see if this test is available.

Inspect

1. Install a tachometer or scan tool.
2. Operate the vehicle unit proper operating temperature is reached.
3. Drive the vehicle at 80 - 88 km/h (50 - 55 mph) with light throttle (road load).
4. Maintaining throttle position, lightly touch the brake pedal and check for release of the TCC and a slight increase in engine speed (RPM).
5. Release the brake slowly accelerate and check for a reapply of the Lock up clutch and a slight decrease in engine speed (RPM).

Circuit Description

The Transaxle Control Module (TCM) is an electronic device which monitors inputs to control various transaxle functions including shift quality and transaxle sensors, switches and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.

Conditions for Setting the DTC

1. System voltage is less than 8.5 V.
2. Transaxle input voltage is too low.
3. Engine speed is greater than 500 RPM.
4. Immediately after the above condition occurs.

Action Taken When the DTC Sets

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

Conditions for Clearing the DTC

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

Diagnostic Aids

1. Inspect the poor wiring harness connection for TCM connectors and transaxle wiring connectors.
2. Inspect the improperly formed or damaged terminals.

Troubleshooting

TROUBLESHOOTING REFERENCE CHART

Scheme 9

The Transaxle Control Module (TCM) is an electronic device which monitors inputs to control various transaxle functions including shift quality and transaxle sensors, switches and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.

1. System voltage is greater than 16 V.
2. Transaxle input voltage is too high.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

Conditions for Clearing the MIL/DTC

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

TROUBLESHOOTING REFERENCE CHART

A normal function of the Transaxle Control Module (TCM) programming is to perform an internal check that verifies the integrity of the RAM memory allocations.

The DTC P0601 sets when the Random Access Memory (RAM) is not operating correctly when checked on initialization. An area of RAM is failed a read/write test.

1. The EEPROM checksum test is separated in two independent parts, the code checksum test and the calibration checksum test. For each area the checksum is calculated and compared with the corresponding checksum valve. If the valves are different, the fault will be set.
2. System voltage is too high or too low.
3. Transaxle input voltage is too high or too low.
4. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

1. When DTC P0601 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

Scheme 10

A normal function of the Transaxle Control Module (TCM) programming is to perform an internal check that verifies the integrity of the Keep Alive Memory (KAM) allocations.

The DTC P0603 sets when the KAM is not operating correctly when checked on initialization.

An area of KAM is failed a read/write test.

1. The checksum of the current regulator data will be tested. If the checksum is not OK, then the error bit will be set.
2. If writing to FLASH during power latch phase failed.
3. Each of the flash blocks has its own status which is located at the beginning of the each flash block and the status of the FLASH blocks do not fit together.
4. System voltage is too high or too low.
5. Transaxle input voltage is too high or too low.
6. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0603 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

A normal function of the Transaxle Control Module (TCM) programming is to perform an internal check that verifies the integrity of the RAM memory allocations.

The DTC P0604 sets when the Random Access Memory (RAM) is not operating correctly when checked on initialization. An area of RAM is failed a read/write test.

1. An area of RAM is failed a read/write test.
2. System voltage is too high or too low.
3. Transaxle input voltage is too high or too low.
4. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0604 sets, the replacement of TCM is recommended.

TROUBLESHOOTING REFERENCE CHART

In case that TCM reset has occurred by software (warm reset) not by ignition key ON, TCM increments software reset counter. If the counter exceeds the permissible maximum value for the software count then the fault will be detected.

1. System voltage is too high or too low.
2. Transaxle input voltage is too high or too low.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.
4. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

TROUBLESHOOTING REFERENCE CHART

Scheme 11

The brake switch is used to indicate brake pedal status to the Transaxle Control Module (TCM). The brake switch is a normally open switch. Applying the brake pedal closes the switch, supplying voltage to the TCM. Releasing the brake pedal interrupts voltage to the TCM.

Note. If the brake pedal was applied prior to or during the connection of the scan tool to the vehicle, P0703 will be disappeared. If the system is operating normally, the code will then be deleted once the brake pedal is applied with the scan tool connected.

This DTC is stored at start-up. If the TCM receives a brake switch signal after start-up, the DTC will be stored in memory.

1. Brake switch stuck to closed.
2. Brake switch wiring harness shortage to ground.
3. Brake switch wiring harness shortage to power.
4. Immediately after the above condition occurs.

1. No lamp control required but diagnostic information should be stored immediately when malfunction is detected.
2. TCM assume that the brake light always active.

Using a scan tool can clear history DTCs.

1. Inspect the poor wiring harness connection for TCM connectors and transaxle wiring connectors.
2. Inspect the improperly formed or damage terminals.

TROUBLESHOOTING REFERENCE CHART

Scheme 12

The Transaxle range switch is located on the selector shaft and informs the TCM of the current selector lever position P-R-N-D-3-2-1.

The selector lever position is transmitted to the TCM in encoded form along 4 lines. The encoding is such that malfunctions in the connecting lead are identified.

The TR switch is located on the selector shaft, which is connected to the selector lever via a pull cable. In addition, the TR switch controls the starter interlock, the reverse lights and the selector lever position indicator on the instrument panel.

1. TR switch stuck to closed.
2. TR switch wiring harness shortage to ground.
3. TR switch wiring harness shortage to power.
4. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0705 sets, the possible cause of TR switch.

TROUBLESHOOTING REFERENCE CHART

Scheme 13

The TFT sensor is a positive temperature coefficient thermistor (temperature sensitive resistor) that provides information to the TCM regarding transaxle fluid temperature. The temperature sensor is located in valve body. Calculated temperature is a factor used to determine the shift time and shift delay time.

The internal electrical resistance of the sensor varies in relation to the operating temperature of the transaxle fluid.

The TCM sends a 5 volt-reference signal to the temperature sensor and measures the voltage rise in the electrical circuit. A higher fluid temperature creates a higher resistance in the temperature sensor, thereby measuring a higher voltage signal.

The TCM measures this voltage as another input to help control line pressure, shift schedules and TCC apply. When transaxle fluid temperature reaches 120 °C (248 °F) the TCM enters "hot mode." Above this temperature the TCM modifies transaxle shift schedules and TCC apply in an attempt to reduce fluid temperature by reducing transaxle heat generation.

1. The calculated temperature is compared with the predetermined min. and max. value.
2. If the temperature is less than min. value or greater than max value then the current temperature is regarded as of range and the corresponding error but will be set.

1. The hold lamp will blink.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. TCM assumes the transaxle fluid temperature is 60 °C (140 °F).
4. No influence on driveability.

1. The blinking hold lamp will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0710 sets, the possible cause of fault could be Transaxle Temperature Sensor.

TROUBLESHOOTING REFERENCE CHART

The TFT sensor is a positive temperature coefficient thermistor (temperature sensitive resistor) that provides information to the TCM regarding transaxle fluid temperature. The temperature sensor is located in valve body. Calculated temperature is a factor used to determine the shift time and shift delay time.

The internal electrical resistance of the sensor varies in relation to the operating temperature of the transaxle fluid.

The TCM sends a 5 volt-reference signal to the temperature sensor and measures the voltage rise in the electrical circuit. A higher fluid temperature creates a higher resistance in the temperature sensor, thereby measuring a higher voltage signal.

The TCM measures this voltage as another input to help control line pressure, shift schedules and TCC apply. When transaxle fluid temperature reaches 120 °C (248 °F) the TCM enters "hot mode." Above this temperature the TCM modifies transaxle shift schedules and TCC apply in an attempt to reduce fluid temperature by reducing transaxle heat generation.

1. Temperature has not changed more than 4 °C (39.2 °F).
2. Engine speed is greater than 500 RPM.
3. System voltage is greater than 9 V.
4. No CAN error DTCs U0073, U0100 and U0101.
5. No vehicle speed error DTCs P0720, P0721, or P0722.
6. Vehicle speed is greater than 20 km/h (12 mph) for 500 sec. cumulative.
7. Temperature at start up is between -40 °C (-40 °F) and 25 °C (77 °F).
8. Engine coolant temperature has changed by more than 50 °C (122 °F) since start up.

1. The hold lamp will blink.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. TCM assume the transaxle fluid temperature is 60 °C (140 °F).
4. No influence on driveability.

1. The blinking hold lamp will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0711 sets, the possible cause of fault could be transaxle fluid temperature sensor.

TROUBLESHOOTING REFERENCE CHART

The TFT sensor is a positive temperature coefficient thermistor (temperature sensitive resistor) that provides information to the TCM regarding transaxle fluid temperature. The temperature sensor is located in valve body. Calculated temperature is a factor used to determine the shift time and shift delay time.

The internal electrical resistance of the sensor varies in relation to the operating temperature of the transaxle fluid.

The TCM sends a 5 volt-reference signal to the temperature sensor and measures the voltage rise in the electrical circuit. A higher fluid temperature creates a higher resistance in the temperature sensor, thereby measuring a higher voltage signal.

The TCM measures this voltage as another input to help control line pressure, shift schedules and TCC apply. When transaxle fluid temperature reaches 120 °C (248 °F) the TCM enters "hot mode." Above this temperature the TCM modifies transaxle shift schedules and TCC apply in an attempt to reduce fluid temperature by reducing transaxle heat generation.

TFT sensor output voltage is less than 0.05 V.

1. The hold lamp will blink.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. TCM assumes the transaxle fluid temperature is 60 °C (140 °F).
4. No influence on driveability.

1. The blinking hold lamp will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0712 sets, the possible cause of fault could be Transaxle Temperature Sensor.

TROUBLESHOOTING REFERENCE CHART

Scheme 14

The TFT sensor is a positive temperature coefficient thermistor (temperature sensitive resistor) that provides information to the TCM regarding transaxle fluid temperature. The temperature sensor is located in valve body. Calculated temperature is a factor used to determine the shift time and shift delay time.

The internal electrical resistance of the sensor varies in relation to the operating temperature of the transaxle fluid.

The TCM sends a 5 volt-reference signal to the temperature sensor and measures the voltage rise in the electrical circuit. A higher fluid temperature creates a higher resistance in the temperature sensor, thereby measuring a higher voltage signal.

The TCM measures this voltage as another input to help control line pressure, shift schedules and TCC apply. When transaxle fluid temperature reaches 120 °C (248 °F) the TCM enters "hot mode." Above this temperature the TCM modifies transaxle shift schedules and TCC apply in an attempt to reduce fluid temperature by reducing transaxle heat generation.

TFT sensor output voltage is less than 4.9 V.

1. The hold lamp will blink.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. TCM assumes the transaxle fluid temperature is 60 °C (140 °F).
4. No influence on driveability.

1. The blinking hold lamp will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0713 sets, the possible cause of fault could be Transaxle Temperature Sensor.

TROUBLESHOOTING REFERENCE CHART

Scheme 15

Information relative to transaxle input speed to the TCM. The TCM uses transaxle input speed information to control line pressure, TCC apply and release and transaxle shift patterns. This information is also uses to calculate the appropriate operating gear ratios and TCC slippage.

The input speed sensor mounts onto piston B that is inside of valve body.

An air gap of 1.8 - 2.2 mm (0.07 - 0.086 in.) is maintained between the sensor and the piston B.

The sensor consists of a permanent magnet surrounded by a coil of wire. As the piston B is driven by the turbine shaft, an AC signal is induced by the input speed sensor. Higher vehicle speeds induce a higher frequency and voltage measurement at the sensor.

Sensor resistance should measure between 825 - 835 ohms at 20 °C (68 °F). Sensor can measure from 1,000 - 8,000 Hz.

1. Input speed is more than 7,000 RPM.
2. System voltage is too high or too low.
3. TCM or ECM is defective.
4. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Position P, R and N also possible.
5. Open lock up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0715 sets, the possible cause of fault could be ISS (input speed sensor).

TROUBLESHOOTING REFERENCE CHART

Scheme 16

Information relative to transaxle input speed to the TCM. The TCM uses transaxle input speed information to control line pressure, TCC apply and release and transaxle shift patterns. This information is also uses to calculate the appropriate operating gear ratios and TCC slippage.

The input speed sensor mounts onto piston B that is inside of valve body.

An air gap of 1.8 - 2.2 mm (0.07 - 0.086 in.) is maintained between the sensor and the piston B.

The sensor consists of a permanent magnet surrounded by a coil of wire. As the piston B is driven by the turbine shaft, an AC signal is induced by the input speed sensor. Higher vehicle speeds induce a higher frequency and voltage measurement at the sensor.

Sensor resistance should measure between 825 - 835 ohms at 20 °C (68 °F). Sensor can measure from 1,000 - 8,000 Hz.

1. The increasing rate of the turbine speed is more than 25,000 RPM/sec.
2. The increasing rate of the turbine speed is less than -25,000 RPM/sec.
3. System voltage is greater than 8.5 V.
4. Engine is running.
5. No engine speed error DTCs P0727.
6. Gear position is D.
7. TCM or ECM is defective.
8. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control Position P, R and N also possible.
5. Open lock up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0716 sets, the possible cause of fault could be ISS (input speed sensor).

TROUBLESHOOTING REFERENCE CHART

Information relative to transaxle input speed to the TCM. The TCM uses transaxle input speed information to control line pressure, TCC apply and release and transaxle shift patterns. This information is also uses to calculate the appropriate operating gear ratios and TCC slippage.

The input speed sensor mounts onto piston B that is inside of valve body.

An air gap of 1.8 - 2.2 mm (0.07 - 0.086 in.) is maintained between the sensor and the piston B.

The sensor consists of a permanent magnet surrounded by a coil of wire. As the piston B is driven by the turbine shaft, an AC signal is induced by the input speed sensor. Higher vehicle speeds induce a higher frequency and voltage measurement at the sensor.

Sensor resistance should measure between 825 - 835 ohms at 20 °C (68 °F). Sensor can measure from 1,000 - 8,000 Hz.

1. Input speed is less than 100 RPM.
2. Engine speed is greater than 2,000 RPM.
3. Vehicle speed is greater than 30 km/h (18.6 mph).
4. No output speed sensor error DTC P0722.
5. No engine speed error DTC P0727.
6. No CAN error DTCs U0073, U0100, U0101.
7. System voltage is too high or too low.
8. Input Speed Sensor (ISS) circuit is shorted to ground.
9. ISS circuit is shorted to power.
10. ISS circuit is open.
11. CAN transmitting wiring harness shortage or open.
12. TCM or ECM is defective.
13. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control.
5. Open lock up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0717 sets, the possible cause of fault could be ISS (input speed sensor).

TROUBLESHOOTING REFERENCE CHART

Scheme 17

The vehicle A/T OSS is a magnetic inductive pickup that relays information relative to vehicle speed to the TCM.

Vehicle speed information is used by the TCM to control shift timing, line pressure, and TCC apply and release.

The output speed sensor mounts in the case at the speed sensor rotor, which is pressed onto the spur gear. An air gap of 0.1 - 1.3 mm (0.004 - 0.05 in.) is maintained between the sensor and the teeth on the spur gear teeth. The sensor consists of a permanent magnet surrounded by a coil of wire. As the differential rotates, an AC signal induces a higher frequency and voltage measurement at the sensor. Sensor resistance should measure 8 at 20 °C (68 °F). Sensor can measure from 20 - 8,000 Hz.

1. Output speed is greater than 9,762 RPM.
2. System voltage is too high or too low.
3. CAN transmitting wiring harness shortage or open.
4. TCM or ECM is defective.
5. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.
4. Open lock up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0720 sets, the possible cause of fault could be OSS (Output Speed Sensor).

TROUBLESHOOTING REFERENCE CHART

The vehicle A/T OSS is a magnetic inductive pickup that relays information relative to vehicle speed to the TCM.

Vehicle speed information is used by the TCM to control shift timing, line pressure, and TCC apply and release.

The output speed sensor mounts in the case at the speed sensor rotor, which is pressed onto the spur gear. An air gap of 0.1 - 1.3 mm (0.004 - 0.05 in.) is maintained between the sensor and the teeth on the spur gear teeth. The sensor consists of a permanent magnet surrounded by a coil of wire. As the differential rotates, an AC signal induces a higher frequency and voltage measurement at the sensor. Sensor resistance should measure infinityohms at 20 °C (68 °F). Sensor can measure from 20 - 8,000 Hz.

1. Transaxle speed is less than 8,160 RPM.
2. The increasing rate of output speed is more than 32,768 RPM/sec.
3. The increasing rate of output speed is less than -32,768 RPM/sec.
4. System voltage is greater than 8.5 V.
5. Engine is running.
6. No engine speed error DTCs P0727, P0725.
7. No park/neutral position switch error DTC P0705.
8. TCM or ECM is defective.
9. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.
4. Open lock up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0721 sets, the possible cause of fault could be OSS (Output Speed Sensor).

TROUBLESHOOTING REFERENCE CHART

The vehicle A/T OSS is a magnetic inductive pickup that relays information relative to vehicle speed to the TCM.

Vehicle speed information is used by the TCM to control shift timing, line pressure, and TCC apply and release.

The output speed sensor mounts in the case at the speed sensor rotor, which is pressed onto the spur gear. An air gap of 0.1 - 1.3 mm (0.004 - 0.05 in) is maintained between the sensor and the teeth on the spur gear teeth. The sensor consists of a permanent magnet surrounded by a coil of wire. As the differential rotates, an AC signal induces a higher frequency and voltage measurement at the sensor. Sensor resistance should measure infinityohms at 20 °C (68 °F). Sensor can measure from 20 - 8,000 Hz.

1. If the gear shift is not in progress and the selector lever position is "1", "2", "3", "D" or "Z3" and the transaxle output speed is less than the limit value of transaxle output speed for plausibility check of transaxle output speed and the turbine speed is greater than the limit value of turbine speed for plausibility check of transaxle output speed then the error bit will be set.
2. System voltage is greater than 7 V.
3. Engine is running.
4. No input speed error DTCs P0715, P0716 and P0717.
5. No transaxle range sensor error DTC P0705.
6. TCM or ECM is defective.
7. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Vehicle running remains actual gear.
4. Open lock up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0722 sets, the possible cause of fault could be OSS (Output Speed Sensor).

TROUBLESHOOTING REFERENCE CHART

Scheme 18

The Transaxle Control Module (TCM) is an electronic device which monitors inputs to control various transaxle functions including shift quality and transaxle sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.

DTCs P0725, P0726 and P0727 are related to the same circuit. These DTCs will not illuminate the MIL, however, the DTC will be stored in memory.

Information transmit between TCM and ECM through the CAN line. information is as follows

1. Engine Malfunction Signal.
2. Engine Speed.
3. Engine Output Torque Reduction Signal.
4. Engine Coolant Temperature.

1. The engine speed is greater than 7,000 RPM.
2. System voltage is too high or too low.
3. CAN transmitting wiring harness shorted or open.
4. TCM or ECM is defective.
5. Immediately after the above condition occurs.

1. No lamp control required but diagnostic information should be stored immediately when malfunction is detected.
2. Adopt Emergency/Substitute mode and constant 4th gear.
3. Open lock up clutch.

Using a scan tool can clear history DTCs.

1. Inspect the poor wiring harness connection for TCM connectors and transaxle wiring connectors.
2. Inspect the improperly formed or damaged terminals.

TROUBLESHOOTING REFERENCE CHART

The Transaxle Control Module (TCM) is an electronic device which monitors inputs to control various transaxle functions including shift quality and transaxle sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.

DTCs P0725, P0726 and P0727 are related to the same circuit. These DTCs will not illuminate the MIL, however, the DTC will be stored in memory.

Information transmit between TCM and ECM through the CAN line. information is as follows

1. Engine Malfunction Signal
2. Engine Speed
3. Engine Output Torque Reduction Signal
4. Engine Coolant Temperature

1. Gear position is D.
2. The engine speed is greater than 7,000 RPM.
3. System voltage is greater than 8.5 V.
4. Engine is running.
5. No engine speed error DTCs P0727, P0725.
6. CAN transmitting wiring harness shorted or open.
7. TCM or ECM is defective.
8. Immediately after the above condition occurs.

1. Hold lamp will blink.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.
4. Open lock up clutch.

1. The hold lamp will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

TROUBLESHOOTING REFERENCE CHART

The Transaxle Control Module (TCM) is an electronic device which monitors inputs to control various transaxle functions including shift quality and transaxle sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.

DTCs P0725, P0726 and P0727 are related to the same circuit. These DTCs will not illuminate the MIL, however, the DTC will be stored in memory.

Information transmit between TCM and ECM through the CAN line. information is as follows

1. Engine Malfunction Signal
2. Engine Speed
3. Engine Output Torque Reduction Signal
4. Engine Coolant Temperature

1. When turbine speed is more than 1,500 RPM, engine speed is less than 400 RPM.
2. System voltage is too high or too low.
3. CAN transmitting wiring harness shorted or open.
4. TCM or ECM is defective.
5. Immediately after the above condition occurs.

1. Hold lamp will blink.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.
4. Open lock up clutch.

1. The hold lamp will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

TROUBLESHOOTING REFERENCE CHART

The TCM uses transaxle input speed information and output speed sensor to control line pressure, TCC apply and release and transaxle shift patterns. This information is also uses to calculate the appropriate operating gear ratios and TCC slippage. Conditions for Setting the DTC.

1. Time since TCM reset is greater than 500 msec.
2. Time since shift end is greater than 500 msec.
3. Transaxle oil temperature is greater than -10 °C (14 °F).
4. System voltage is greater than 9 V.
5. No input speed error DTCs P0715, P0716 and P0717.
6. Output speed is greater than 256 RPM.
7. Input speed is greater than 400 RPM.
8. No gear shift active.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.
4. High line pressure.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

1. Check for intermittent input speed sensor or output speed sensor circuit problems.
2. Check for possible incorrect calibration.

TROUBLESHOOTING REFERENCE CHART

The TCM uses transaxle input speed information and output speed sensor to control line pressure, TCC apply and release and transaxle shift patterns. This information is also uses to calculate the appropriate operating gear ratios and TCC slippage. Conditions for Setting the DTC.

1. Time since TCM reset is greater than 500 msec.
2. Time since shift end is greater than 500 msec.
3. Transaxle oil temperature is greater than -10 °C (14 °F).
4. System voltage is greater than 9 V.
5. No input speed error DTCs P0715, P0716 or P0717.
6. Output speed is greater than 256 RPM.
7. Input speed is greater than 400 RPM.
8. No gear shift active.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 3rd gear.
4. High line pressure.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

1. Check for intermittent input speed sensor or output speed sensor circuit problems.
2. Check for possible incorrect calibration.

TROUBLESHOOTING REFERENCE CHART

The TCM uses transaxle input speed information and output speed sensor to control line pressure, TCC apply and release and transaxle shift patterns. This information is also uses to calculate the appropriate operating gear ratios and TCC slippage. Conditions for Setting the DTC.

1. Time since TCM reset is greater than 500 msec.
2. Time since shift end is greater than 500 msec.
3. Transaxle oil temperature is greater than -10 °C (14 °F).
4. System voltage is greater than 9 V.
5. No input speed error DTCs P0715, P0716 and P0717.
6. Output speed is greater than 256 RPM.
7. Input speed is greater than 400 RPM.
8. No gear shift active.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.
4. High line pressure.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

1. Check for intermittent input speed sensor or output speed sensor circuit problems.
2. Check for possible incorrect calibration.

TROUBLESHOOTING REFERENCE CHART

The TCM uses transaxle input speed information and output speed sensor to control line pressure, TCC apply and release and transaxle shift patterns. This information is also uses to calculate the appropriate operating gear ratios and TCC slippage. Conditions for Setting the DTC.

1. Time since TCM reset is greater than 500 msec.
2. Time since shift end is greater than 500 msec.
3. Transaxle oil temperature is greater than -10 °C (14 °F).
4. System voltage is greater than 9 V.
5. No input speed error DTCs P0715, P0716 and P0717.
6. Output speed is greater than 256 RPM.
7. Input speed is greater than 400 RPM.
8. No gear shift active.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. High line pressure.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

1. Check for intermittent input speed sensor or output speed sensor circuit problems.
2. Check for possible incorrect calibration.

TROUBLESHOOTING REFERENCE CHART

Shifting between individual gears takes place by means of overlapping clutch engagement and release. If two clutches are engaged or released at the same time during shifting, the transaxle or engine could be damaged.

To prevent this damage, TCM monitors the clutch pressure at the shifting point.

Once shifting begins, TCM begins the monitoring after the regular time and inspects the turbine revolution speed. If the revolution speed is not within the specified value, the fault occurs and TCM memorize it.

1. Vehicle shift solenoid fault does not occur.
2. Throttle is more than 10%.
3. Transaxle oil temperature is more than -10 °C (14 °F).
4. System voltage is more than 9 V.
5. No input speed error DTCs P0715, P0716 and P0717.
6. No engine speed error DTCs P0725, P0726 and P0727.
7. Engine speed is more than 1,200 RPM.
8. Input speed is more than 1,200 RPM.
9. Engine is running.
10. Selector lever is not in N (Neutral), P (Park) position.
11. TCC lock-up status is commanded ON.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Open lock-up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

1. Inspect the poor wiring harness connection for TCM connectors and transaxle wiring connectors.
2. Inspect the improperly formed or damaged terminals.

TROUBLESHOOTING REFERENCE CHART

Shifting between individual gears takes place by means of overlapping clutch engagement and release.

If two clutches are engaged or released at the same time during shifting, the transaxle or engine could be damaged.

To prevent this damage, TCM monitors the clutch pressure at the shifting point.

Once shifting begins, TCM begins the monitoring after the regular time and inspects the turbine revolution speed. If the revolution speed is not within the specified value, the fault occurs and TCM memorize it.

1. Vehicle shift solenoid fault does not occur.
2. Throttle is more than 10%.
3. Transaxle oil temperature is more than -10 °C (14 °F).
4. System voltage is more than 9 V.
5. No input speed error DTCs P0715, P0716 and P0717.
6. No engine speed error DTCs P0725, P0726 and P0727.
7. Engine speed is more than 1,200 RPM.
8. Input speed is more than 1,200 RPM and 3,500 RPM.
9. Engine is running.
10. Selector lever is not in N (Neutral), P (Park) position.
11. TCC lock-up status is commanded OFF.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Open lock-up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

1. Inspect the poor wiring harness connection for TCM connectors and transaxle wiring connectors.
2. Inspect the improperly formed or damaged terminals.

TROUBLESHOOTING REFERENCE CHART

The special feature of 4HP 16 Auto Transaxle is that it operates without freewheels. Shifting between individual gears takes place by means of overlapping clutch engagement and release.

The advantage of overlap shifting are as follows

1. The transaxle can be of more compact design and is lighter on account of the absence of freewheels and the lower number of shift elements.
2. Lower drag losses, i.e. higher efficiency.
3. Lower peak torque acting on the components and driveline.

However, overlap shifting necessitates high-performance hardware and software, and precision engine signals.

1. Transaxle oil temperature is greater than -10 °C (14 °F).
2. Selector lever is not N (Neutral), P (Park) position.
3. System voltage is greater than 9 V.
4. No input speed error DTCs P0715, P0716 and P0717.
5. Output speed is greater than 256 RPM.
6. Input speed is greater than 400 RPM.
7. 1 - 2 gear shift is active.
8. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 1st gear.
4. Open lock-up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0781 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

The special feature of 4HP 16 Auto Transaxle is that it operates without freewheels. Shifting between individual gears takes place by means of overlapping clutch engagement and release.

The advantage of overlap shifting are as follows

1. The transaxle can be of more compact design and is lighter on account of the absence of freewheels and the lower number of shift elements.
2. Lower drag losses, i.e. higher efficiency.
3. Lower peak torque acting on the components and driveline.

However, overlap shifting necessitates high-performance hardware and software, and precision engine signals.

1. Transaxle oil temperature is greater than -10 °C (14 °F).
2. Selector lever is not N (Neutral), P (Park) position.
3. System voltage is greater than 9 V.
4. No input speed error DTCs P0715, P0716 and P0717.
5. Output speed is greater than 256 RPM.
6. Input speed is greater than 400 RPM.
7. 2 - 3 gear shift is active.
8. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 2nd gear.
4. Open lock-up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0782 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

The special feature of 4HP 16 Auto Transaxle is that it operates without freewheels. Shifting between individual gears takes place by means of overlapping clutch engagement and release.

The advantage of overlap shifting are as follows

1. The transaxle can be of more compact design and is lighter on account of the absence of freewheels and the lower number of shift elements.
2. Lower drag losses, i.e. higher efficiency.
3. Lower peak torque acting on the components and driveline.

However, overlap shifting necessitates high-performance hardware and software, and precision engine signals.

1. Transaxle oil temperature is greater than -10 °C (14 °F).
2. Selector lever is not N (Neutral), P (Park) position.
3. System voltage is greater than 9 V.
4. No input speed error DTCs P0715, P0716 and P0717.
5. Output speed is greater than 256 RPM.
6. Input speed is greater than 400 RPM.
7. 3 - 4 gear shift is active.
8. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 3rd gear.
4. Open lock-up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P0783 sets, the possible cause of fault could be T/M.

TROUBLESHOOTING REFERENCE CHART

A normal function of the Transaxle Control Module (TCM) programming is to perform an internal check that verifies the integrity of the RAM memory allocations.

The DTC P1604 sets when the Random Access Memory (RAM) is not operating correctly when checked on initialization. An area of RAM is failed a read/write test.

1. An area of RAM is failed a read/write test.
2. System voltage is too high or too low.
3. Transaxle input voltage is too high or too low.
4. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.

A history DTC will clear after 40 consecutive warm up cycles without a fault.

Using a scan tool can clear history DTCs.

When DTC P1604 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

The external watchdog will be triggered. If the external watchdog does not run out after 30 ms then the fault will be detected.

1. System voltage is too high or too low.
2. Transaxle input voltage is too high or too low.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. History DTCs can be cleared by using a scan tool.

When DTC P1606 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

The Transaxle Control Module (TCM) is an electronic device which monitors inputs to control various transaxle functions including shift quality and transaxle sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.

Information is transmitted between the TCM and ECM through the CAN. Information is as follows

1. Engine Malfunction Signal
2. Engine Speed
3. Engine Output Torque Reduction Signal
4. Engine Coolant Temperature

1. System voltage is too high or too low.
2. TCM or ECM is defective.
3. Immediately after the above condition occurs.

1. No lamp control required but diagnostic information should be stored immediately when malfunction is detected.
2. Adjustable value, calculated over the substitute map engine torque. (throttle position, engine speed)

Using a scan tool can clear history DTCs.

1. Inspect the poor wiring harness connection for TCM connectors and transaxle wiring connectors.
2. Inspect the improperly formed or damaged terminals.

TROUBLESHOOTING REFERENCE CHART

The Transaxle Control Module (TCM) is an electronic device which monitors inputs to control various transaxle functions including shift quality and transaxle sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.

Information is transmitted between the TCM and ECM through the CAN. Information is as follows

1. Engine Malfunction Signal
2. Engine Speed
3. Engine Output Torque Reduction Signal
4. Engine Coolant Temperature

1. System voltage is too high or too low.
2. TCM or ECM is defective.
3. Immediately after the above condition occurs.

1. No lamp control required but diagnostic information should be stored immediately when malfunction is detected.
2. Adjustable value, calculated over the substitute map throttle position. (engine speed, engine torque)

Using a scan tool can clear history DTCs.

1. Inspect the poor wiring harness connection for TCM connectors and transaxle wiring connectors.
2. Inspect the improperly formed or damaged terminals.

TROUBLESHOOTING REFERENCE CHART

Scheme 19

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output voltage of the EDS 3 is less than 2 V.
2. No DTC P1840, P1841.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1839 sets, the possible cause of fault could be EDS3 valve.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output voltage of the EDS 3 (at ON) is 12 V.
2. No DTC P1839, P1841.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1840 sets, the possible cause of fault could be EDS3.

TROUBLESHOOTING REFERENCE CHART

Scheme 20

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output voltage of the EDS 3 is less than 10 mA.
2. No DTC P1839, P1840.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1841 sets, the possible cause of fault could be EDS3 valve.

TROUBLESHOOTING REFERENCE CHART

Scheme 21

The shift solenoids are two identical, normally open electronic exhaust valves that control upshifts and downshifts in all forward gear ranges. These shift solenoids work together in a combination of ON and OFF sequences to control the line pressure and shift mechanisms (clutches, brakes).

Solenoid 1 controls the high or low of the line pressure (flow to each clutch valve) by the operation type (ON/OFF), i.e. solenoid 1 is ON, line pressure will be low (87 - 116 psi [6 - 8 bar]), solenoid 1 is OFF, line pressure will be high (232 - 261 psi [16 - 18 bar]). Solenoid 2 controls the oil flow to clutch valve E or lock-up clutch valve by the ON/OFF signal.

The TCM monitors numerous inputs to determine the appropriate solenoid state combination and transaxle gear for the vehicle operating conditions.

1. Solenoid wiring shorted to ground.
2. No DTC P1851, P1852.
3. Immediately after the above condition occurs.

1. Hold lamp will blink.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.

1. The hold lamp will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1850 sets, the possible cause of fault could be solenoid 1.

TROUBLESHOOTING REFERENCE CHART

The shift solenoids are two identical, normally open electronic exhaust valves that control upshifts and downshifts in all forward gear ranges. These shift solenoids work together in a combination of ON and OFF sequences to control the line pressure and shift mechanisms (clutches, brakes).

Solenoid 1 controls the high or low of the line pressure (flow to each clutch valve) by the operation type (ON/OFF), i.e. solenoid 1 is ON, line pressure will be low (87 - 116 psi [6 - 8 bar]), solenoid 1 is OFF, line pressure will be high (232 - 261 psi [16 - 18 bar]). Solenoid 2 controls the oil flow to clutch valve E or lock-up clutch valve by the ON/OFF signal.

The TCM monitors numerous inputs to determine the appropriate solenoid state combination and transaxle gear for the vehicle operating conditions.

1. Solenoid wiring shorted to power.
2. No DTC P1850, P1852.
3. Immediately after the above condition occurs.

1. Hold lamp will blink. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.

1. The hold lamp will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1851 sets, the possible cause of fault could be solenoid 1.

TROUBLESHOOTING REFERENCE CHART

The shift solenoids are two identical, normally open electronic exhaust valves that control upshifts and downshifts in all forward gear ranges. These shift solenoids work together in a combination of ON and OFF sequences to control the line pressure and shift mechanisms (clutches, brakes).

Solenoid 1 controls the high or low of the line pressure (flow to each clutch valve) by the operation type (ON/OFF), i.e. solenoid 1 is ON, line pressure will be low (87 - 116 psi [6 - 8 bar]), solenoid 1 is OFF, line pressure will be high (232 - 261 psi [16 - 18 bar]). Solenoid 2 controls the oil flow to clutch valve E or lock-up clutch valve by the ON/OFF signal.

The TCM monitors numerous inputs to determine the appropriate solenoid state combination and transaxle gear for the vehicle operating conditions.

1. Solenoid wiring open.
2. No DTC P1850, P1851.
3. Immediately after the above condition occurs.

1. Hold lamp will blink.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.

1. The hold lamp will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1852 sets, the possible cause of fault could be solenoid 1.

TROUBLESHOOTING REFERENCE CHART

The shift solenoids are two identical, normally open electronic exhaust valves that control upshifts and downshifts in all forward gear ranges. These shift solenoids work together in a combination of ON and OFF sequences to control the line pressure and shift mechanisms (clutches, brakes).

Solenoid 2 controls the high or low of the line pressure (flow to each clutch valve) by the operation type (ON/OFF), i.e. solenoid 2 is ON, line pressure will be low (87 - 116 psi [6 - 8 bar]), solenoid 1 is OFF, line pressure will be high (232 - 261 psi [16 - 18 bar]). Solenoid 2 controls the oil flow to clutch valve E or lock-up clutch valve by the ON/OFF signal.

The TCM monitors numerous inputs to determine the appropriate solenoid state combination and transaxle gear for the vehicle operating conditions.

1. Solenoid wiring shorted to ground.
2. No DTC P1854, P1855.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1853 sets, the possible cause of fault could be solenoid 2.

TROUBLESHOOTING REFERENCE CHART

The shift solenoids are two identical, normally open electronic exhaust valves that control upshifts and downshifts in all forward gear ranges. These shift solenoids work together in a combination of ON and OFF sequences to control the line pressure and shift mechanisms (clutches, brakes).

Solenoid 2 controls the high or low of the line pressure (flow to each clutch valve) by the operation type (ON/OFF), i.e. solenoid 2 is ON, line pressure will be low (87 - 116 psi [6 - 8 bar]), solenoid 1 is OFF, line pressure will be high (232 - 261 psi [16 - 18 bar]). Solenoid 2 controls the oil flow to clutch valve E or lock-up clutch valve by the ON/OFF signal.

The TCM monitors numerous inputs to determine the appropriate solenoid state combination and transaxle gear for the vehicle operating conditions.

1. Solenoid wiring shorted to power.
2. No DTC P1853, P1855.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1854 sets, the possible cause of fault could be solenoid 2.

TROUBLESHOOTING REFERENCE CHART

The shift solenoids are two identical, normally open electronic exhaust valves that control upshifts and downshifts in all forward gear ranges. These shift solenoids work together in a combination of ON and OFF sequences to control the line pressure and shift mechanisms (clutches, brakes).

Solenoid 2 controls the high or low of the line pressure (flow to each clutch valve) by the operation type (ON/OFF), i.e. solenoid 2 is ON, line pressure will be low (87 - 116 psi [6 - 8 bar]), solenoid 1 is OFF, line pressure will be high (232 - 261 psi [16 - 18 bar]). Solenoid 2 controls the oil flow to clutch valve E or lock-up clutch valve by the ON/OFF signal.

The TCM monitors numerous inputs to determine the appropriate solenoid state combination and transaxle gear for the vehicle operating conditions.

1. Solenoid wiring open.
2. No DTC P1853, P1854.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1855 sets, the possible cause of fault could be solenoid 2.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output voltage of the EDS 4 is less than 2 V.
2. No DTC P1862, P1863.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1861 sets, the possible cause of fault could be EDS4 valve.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output voltage of the EDS 4 (at ON) is 12 V.
2. No DTC P1861, P1863.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1862 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output ampere of the EDS 4 is less than 10 mA.
2. No DTC P1861, P1862.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1863 sets, the possible cause of fault could be EDS4 valve.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output voltage of the EDS 5 is less than 2 V.
2. No DTC P1865, P1866.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1864 sets, the possible cause of fault could be EDS valve.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output voltage of the EDS 5 (at ON) is 12 V.
2. No DTC P1864, P1866.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1865 sets, the possible cause of fault could be EDS5.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output ampere of the EDS 5 is less than 10 mA.
2. No DTC P1864, P1865.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1866 sets, the possible cause of fault could be EDS valve.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output voltage of the EDS 6 is less than 2 V.
2. No DTC P1868, P1869.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1867 sets, the possible cause of fault could be EDS valve.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output voltage of the EDS 6 (at ON) is 12 V.
2. No DTC P1867, P1869.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1868 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. Output ampere of the EDS 6 is less than 10 mA.
2. No DTC P1867, P1868.
3. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.
4. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1869 sets, the possible cause of fault could be EDS valve.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. If the voltage applied to high side driver is higher than the threshold (6 V) with high side driver switch off status then a fault is detected.
2. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.
5. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1871 sets, the possible cause of fault could be EDS valve power supply line.

TROUBLESHOOTING REFERENCE CHART

The pressure control valves (EDS valves 3, 4, 5 and 6) are precision electronic pressure regulators that control the operation of the clutches, brakes and lock-up clutch.

The valve reduces the system pressure with which the downstream solenoid valves and electrical pressure regulating valves are supplied. It is possible to use smaller solenoid valves as a result. The EDS require a constant input pressure.

1. No DTC P1873.
2. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.
4. Power supply cut OFF to the EDS valve.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1874 sets, the possible cause of fault could be solenoid valve power supply line.

TROUBLESHOOTING REFERENCE CHART

The special feature of 4HP 16 Automatic Transaxle is that it operates without freewheels. Shifting between individual gears takes place by means of overlapping clutch engagement and release.

The advantage of overlap shifting are as follows

1. The transaxle can be of more compact design and is lighter on account of the absence of freewheels and the lower number of shift elements.
2. Lower drag losses, i.e. higher efficiency.
3. Lower peak torque acting on the components and driveline.

However, overlap shifting necessitates high-performance hardware and software, and precision engine signals.

1. Transaxle oil temperature is greater than -10 °C (14 °F).
2. Selector lever is not in N (Neutral), P (Park) position.
3. System voltage is greater than 9 V.
4. No input speed error DTCs P0715, P0716 or P0717.
5. Output speed is greater than 256 RPM.
6. Input speed is greater than 400 RPM.
7. 2 - 1 gear shift is active.
8. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 3rd gear.
4. Open lock-up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1881 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

The special feature of 4HP 16 Automatic Transaxle is that it operates without freewheels. Shifting between individual gears takes place by means of overlapping clutch engagement and release.

The advantage of overlap shifting are as follows

1. The transaxle can be of more compact design and is lighter on account of the absence of freewheels and the lower number of shift elements.
2. Lower drag losses, i.e. higher efficiency.
3. Lower peak torque acting on the components and driveline.

However, overlap shifting necessitates high-performance hardware and software, and precision engine signals.

1. Transaxle oil temperature is greater than -10 °C (14 °F).
2. Selector lever is not in N (Neutral), P (Park) position.
3. System voltage is greater than 9 V.
4. No input speed error DTCs P0715, P0716 or P0717.
5. Output speed is greater than 256 RPM.
6. Input speed is greater than 400 RPM.
7. 3 - 2 gear shift is active.
8. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 3rd gear.
4. Open lock-up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1883 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

The special feature of 4HP 16 Automatic Transaxle is that it operates without freewheels. Shifting between individual gears takes place by means of overlapping clutch engagement and release.

The advantage of overlap shifting are as follows

1. The transaxle can be of more compact design and is lighter on account of the absence of freewheels and the lower number of shift elements.
2. Lower drag losses, i.e. higher efficiency.
3. Lower peak torque acting on the components and driveline.

However, overlap shifting necessitates high-performance hardware and software, and precision engine signals.

1. Transaxle oil temperature is greater than -10 °C (14 °F).
2. Selector lever is not in N (Neutral), P (Park) position.
3. System voltage is greater than 9 V.
4. No input speed error DTCs P0715, P0716 or P0717.
5. Output speed is greater than 256 RPM.
6. Input speed is greater than 400 RPM.
7. 4 - 3 gear shift is active.
8. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear.
4. Open lock-up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1884 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

The special feature of 4HP 16 Automatic Transaxle is that it operates without freewheels. Shifting between individual gears takes place by means of overlapping clutch engagement and release.

The advantage of overlap shifting are as follows

1. The transaxle can be of more compact design and is lighter on account of the absence of freewheels and the lower number of shift elements.
2. Lower drag losses, i.e. higher efficiency.
3. Lower peak torque acting on the components and driveline.

However, overlap shifting necessitates high-performance hardware and software, and precision engine signals.

1. Transaxle oil temperature is greater than -10 °C (14 °F).
2. Selector lever is not in N (Neutral), P (Park) position.
3. System voltage is greater than 9 V.
4. No input speed error DTCs P0715, P0716 or P0717.
5. Output speed is greater than 256 RPM.
6. Input speed is greater than 400 RPM.
7. 3 - 1 gear shift is active.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 3rd gear.
4. Open lock-up clutch.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycle.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

When DTC P1885 sets, the possible cause of fault could be TCM.

TROUBLESHOOTING REFERENCE CHART

The Transaxle Control Module (TCM) is an electronic device which monitors inputs to control various transaxle functions including shift quality and transaxle sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.

Information is transmitted between the TCM and ECM through the CAN. Information is as follows

1. Engine Malfunction Signal
2. Engine Speed
3. Engine Output Torque Reduction Signal
4. Engine Coolant Temperature

1. Turbine speed is greater than 500 RPM.
2. System voltage is too high or too low.
3. CAN transmitting wiring harness shortage or open.
4. TCM or ECM is defective.
5. Immediately after the above condition occurs.

1. The malfunction indicator lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

TROUBLESHOOTING REFERENCE CHART

The Transaxle Control Module (TCM) is an electronic device which monitors inputs to control various transaxle functions including shift quality and transaxle sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.

Information is transmitted between the TCM and ECM through the CAN. Information is as follows

1. Engine Malfunction Signal
2. Engine Speed
3. Engine Output Torque Reduction Signal
4. Engine Coolant Temperature

1. Turbine speed is greater than 500 RPM.
2. System voltage is too high or too low.
3. CAN transmitting wiring harness shortage or open.
4. TCM or ECM is defective.
5. Immediately after the above condition occurs.

1. The malfunction indicator lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

TROUBLESHOOTING REFERENCE CHART

The Transaxle Control Module (TCM) is an electronic device which monitors inputs to control various transaxle functions including shift quality and transaxle sensors, switches, and components to process for use within its control program. Based on this input information, the TCM controls various transaxle output functions and devices.

Information is transmitted between the TCM and ECM through the CAN. Information is as follows

1. Engine Malfunction Signal
2. Engine Speed
3. Engine Output Torque Reduction Signal
4. Engine Coolant Temperature

1. Turbine speed is greater than 500 RPM.
2. System voltage is too high or too low.
3. CAN transmitting wiring harness shortage or open.
4. TCM or ECM is defective.
5. Immediately after the above condition occurs.

1. The Malfunction Indicator Lamp (MIL) will illuminate.
2. The TCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records buffer.
3. Adopt Emergency/Substitute mode and constant 4th gear by hydraulic control.
4. After ignition OFF/ON: 3rd gear by hydraulic control. Possible P, R and N also possible.

1. The MIL will turn OFF when the malfunction has not occurred after three-ignition cycles.
2. A history DTC will clear after 40 consecutive warm up cycles without a fault.
3. Using a scan tool can clear history DTCs.

TROUBLESHOOTING REFERENCE CHART