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Home >> Mitsubishi >> 2001 >> Eclipse Spyder GT V6-3.0L SOHC >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Transmission Control System >> DTC 15

DTC 15





A/T Fluid Temperature Sensor System Circuit

CIRCUIT OPERATION
- The PCM (terminal 124) applies 5 volts to the A/T fluid temperature sensor output terminal (terminal 1).
- Ground terminal (terminal 2) is grounded to the PCM (terminal 57).
- The A/T fluid temperature sensor is an NTC (negative temperature coefficient) type of resistor. When the A/T fluid temperature rises, the resistance decreases. The A/T fluid temperature sensor output voltage rises when the resistance increases, and drops when the resistance decreases.

DTC SET CONDITIONS
If the A/T fluid temperature sensor output voltage is 4.5 volts or more after driving for 10 minutes or more (if the A/T fluid temperature does not increase), there is an open circuit in the A/T fluid temperature sensor and diagnostic trouble code number "15" is output.

TROUBLESHOOTING HINTS
(The most likely causes for this code to be set:)
- Malfunction of the A/T fluid temperature sensor circuit
- Damaged harness, connector
- Malfunction of the PCM

DIAGNOSIS


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





STEP 1. Using scan tool MB991502, check data list item 15: A/T Fluid Temperature Sensor.

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. Start the engine.
3. Set scan tool MB991502 to data reading mode for item 15: A/T Fluid Temperature Sensor. At cool condition: Almost equal to the ambient temperature (atmospheric temperature) At warm condition: 70 to 80°C (158 to 176°F)
4. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES: This malfunction is intermittent. Refer to How to Use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction.
NO: Go to Step 2.

STEP 2. Check the ground voltage at PCM connector C-54 <2.4L Engine> or C-55 <3.0L Engine> by backprobing.





1. Do not disconnect connector C-54 <2.0L Engine> or C-55 <3.0L Engine>.
2. Turn the ignition switch to "ON" position.





3. Measure the voltage between terminal 57 and ground by backprobing.
- Voltage should be 0.5 volt or less.
4. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the voltage normal?
YES: Go to Step 5.
NO: Go to Step 3.





STEP 3. Check connector C-54 <2.4L Engine> or C-55 <3.0L Engine> at PCM for damage.
Q: Is the connector in good condition?
YES: Go to Step 4.
NO: Repair or replace it. Refer to Harness Connector Inspection.





STEP 4. Using scan tool MB991502, check date list item 15: A/T Fluid Temperature Sensor.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB9911502.

1. Connect scan tool MB991502 to data link connector.
2. Start the engine.
3. Set scan tool MB991502 to the data reading mode for item 15: A/T Fluid Temperature Sensor.
- At cool condition: Almost equal to the ambient temperature (atmospheric temperature)
- At warm condition: 70 to 80°C (158 to 176°F)
4. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES: This malfunction is intermittent. Refer to How to Use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction.
NO: Replace the PCM.

STEP 8: Check the sensor output voltage at PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> by backprobing.





1. Do not disconnect connector C-61 <2.4L Engine> or C-63 <3.0L Engine>.
2. Turn the ignition switch to "ON" position.





3. Measure the voltage between terminal 124 and ground by backprobing.
- When A/T fluid temperature is 20°C (68°F), voltage should be between 3.8 and 4.0 volts.
- When A/T fluid temperature is 40°C (104°F), voltage should be between 3.2 and 3.4 volts.
- When A/T fluid temperature is 80°C (176°F), voltage should be between 1.7 and 1.9 volts.
4. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the voltage normal?
YES: Go to Step 6.
NO: Go to Step 7.





STEP 6. Check connector C-61 <2.4L Engine> or C-63 <3.0L Engine> at PCM for damage.
Q: Is the connector in good condition?
YES: Go to Step 4.
NO: Repair or replace it. Refer to Harness Connector Inspection.








STEP 7. Check connectors C-54 <2.4L Engine> or C-55 <3.0L Engine> and C-61 <2.4L Engine> or C-63 <3.0L Engine> at PCM and B-40 at A/T control solenoid valve assembly for damage.
Q: Are the harness connectors in good condition?
YES: Go to Step 8.
NO: Repair or replace it. Refer to Harness Connector Inspection.

STEP 8: Check the A/T fluid temperature sensor at A/T control solenoid valve assembly connector B-40.





1. Disconnect connector B-40 and measure at the sensor side.





2. Measure the resistance between terminal 1 and 2.
- When A/T fluid temperature is 0°C (32°F), resistance should be between 16.7 and 20.5 Ohms.
- When A/T fluid temperature is 20°C (68°F), resistance should be between 7.3 and 8.9 Ohms.
- When A/T fluid temperature is 40°C (104°F), resistance should be between 3.4 and 4.2 Ohms.
- When A/T fluid temperature is 80°C (176°F), resistance should be between 1.9 and 2.2 ohm.
- When A/T fluid temperature is 100°C (212°F), resistance should be between 0.57 and 0.69 Ohms.
Q: Is the resistance normal?
YES: Go to Step 9.
NO: Replace the A/T fluid temperature sensor.

STEP 9. Check the power supply voltage at A/T control solenoid valve assembly connector B-40.





1. Disconnect connector B-40 and measure at the harness side.
2. Turn the ignition switch to "ON" position.





3. Measure the voltage between terminal 1 and ground.
- Voltage should be between 4.5 and 4.9 volts.
4. Turn the ignition switch to "LOCK" (OFF) position.
Q: Is the voltage normal?
YES: Go to Step 10.
NO: Repair it because of harness open circuit between A/T control solenoid valve assembly connector B-40 terminal 1 and PCM connector C-61 <2.4L Engine> or C-63 <3.0L Engine> terminal 124.

STEP 10. Check the continuity at A/T control solenoid valve assembly connector B-40.





1. Disconnect connector B-40 and measure at the harness side.





2. Check for the continuity between terminal 2 and ground.
- Should be less than 2 Ohms.
Q: Is the continuity normal?
YES: Go to Step 11.
NO: Repair it because of harness open circuit or damage between A/T control solenoid valve assembly connector B-40 terminal 2 and PCM connector C-54 <2.4L Engine> or C-55 <3.0L Engine> terminal 57.








STEP 11. Check harness for damage between AM control solenoid valve assembly connector B-40 terminal 1 and PCM connector C-54 <2.4L Engine> or C-55 <3.0L Engine> terminal 124.
Q: Is the harness wire in good condition?
YES: Repair it because of harness damage between A/T control solenoid valve assembly connector B-40 terminal 2 and PCM connector C-64 <2.4L Engine> or C-65 <3.0L Engine> terminal 57.
NO: Repair it.


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