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DTC 52

CODE NOS.36, 52, 52: TORQUE CONVERTER CLUTCH SOLENOID VALVE SYSTEM






CIRCUIT OPERATION
- A/T relay supplies the battery positive voltage to the torque converter clutch solenoid valve (terminal 10).
- The torque converter clutch solenoid valve closes when energized (on), and opens when de-energized (off). The PCM energizes or de-energizes the valve, based on input from the A/T fluid temperature sensor, vehicle speed sensor, throttle position sensor, input shaft speed sensor, output shaft speed sensor, and Park/Neutral position sensor.

DTC SET CONDITIONS
- If the resistance value for the torque converter clutch solenoid valve is greater than 3.50 at 100°C for more than 4 seconds or less than 2.6 Ohms at 100°C (212°F) for more than 4 seconds, it is judged that there is a short circuit or an open circuit in the torque converter clutch solenoid valve and diagnostic trouble code number "36" is output. If drive duty rate for the torque converter clutch solenoid valve is 100 percent for continuous period of four seconds or more, it is judged that there is an abnormality in the torque converter clutch system and diagnostic trouble code number "52" is output. When diagnostic trouble code number "36" is output, the transaxle is locked into 3rd gear as a fail-safe measure.
If the torque converter clutch remains engaged for a continuous period of ten seconds when the PCM is attempting to disengage the torque converter clutch, it is judged that the torque converter clutch is stuck on and diagnostic trouble code number "53" is output.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set:
- Malfunction of the torque converter clutch solenoid valve
- Damaged harness, connector
- Malfunction of the PCM

DIAGNOSIS
Required Special Tool: MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

STEP 1. Using Scan Tool MB991502, Check Actuator Test Item 6: Torque Converter Clutch Solenoid Valve.





1. Connect scan tool MB991502 to the data link connector.
2. Check the following item in the actuator test. Refer to Actuator Test Reference Table.
a. Item 6: Torque converter clutch solenoid valve
3. Check that the solenoid valve clicks.

NOTE: The engine must not be running for this test.

If operating sound can be heard, this malfunction may be intermittent. Refer to Diagnostic Strategies; General Electrical Troubleshooting.
If no operating sound can be heard, go to Step 2.

STEP 2. Check The Power Supply Circuit At The Solenoid Valve.
1. Disconnect harness connector B-38 and measure at the harness side.
2. Turn the ignition switch to "ON" position.





3. Measure the voltage between terminal 10 and ground.
- Voltage should be battery positive voltage.
If battery positive voltage, go to Step 3.
If not battery positive voltage, repair the connectors or the harness wires between the solenoid valve and the ignition switch.

STEP 3. Check The Torque Converter Clutch Solenoid Valve.
1. Disconnect harness connector B-38 and measure at the valve side.





2. Measure the resistance of the torque converter clutch solenoid valve.

Standard value:





If within the standard value, go to Step 4.
If not within the standard value, replace the torque converter clutch solenoid valve and solenoid valve harness. Refer to Valve Body under the transmission overhaul procedures. Recheck for DTCs.

STEP 4. Check Harness Connector B-38 At The Torque Converter Clutch Solenoid Valve For Damage.





If harness connector B-38 is damaged, repair or replace it. Refer to Diagnostic Strategies; General Electrical Troubleshooting. Recheck for DTCs.
If harness connector B-38 is in good condition, go to Step 5.

STEP 5. Measure The PCM Terminal Voltage.
Measure the voltage at terminal 107 of PCM connector C-42. Refer to PCM Terminal Voltage Reference Chart for Transaxle Operation.
If the voltage meets the specifications, go to Step 6.
If the voltage does not meet the specifications, repair the connectors or the harness wires between the solenoid valve and the PCM.

STEP 6. Check The Harness Connector C-42 At The PCM For Damage.





If harness connector C-42 is damaged, repair or replace it. Refer to Diagnostic Strategies; General Electrical Troubleshooting. Recheck for DTCs.
If harness connector C-42 is in good condition, replace the PCM On 2000 models, the immobilizer-ECU should be replaced together with it. Refer to Ignition Switch and Immobilizer System or go to Step 7

STEP 7. Using Scan Tool MB991502, Check Data List.
Required Special Tool: MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.





1. Connect scan tool MB991502 to the data link connector.
2. Road test according to the drive conditions specified below.
3. Check the following item in the data list.
a. Item 36: Torque converter clutch solenoid valve duty percent.
b. Item 52: Amount of torque converter clutch slippage





4. Check that the values shown above are displayed when each data list item is entered.
If the values shown above are displayed, replace the torque converter clutch solenoid valve. Refer to Valve Body under the transmission overhaul procedures.
If the values shown above are not displayed, replace the PCM. On 2000 models, the immobilizer-ECU should be replaced together with it. Refer to Ignition Switch and Immobilizer System.
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