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DTC 15






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

DTC SET CONDITIONS
- If the transmission fluid temperature sensor output voltage is 2.6 volts or more even after driving for ten minutes or more (if the transmission fluid temperature does not increase), it is judged that there is an open circuit in the transmission fluid temperature sensor and diagnostic trouble code number "15" is output.
If the transmission fluid temperature sensor output detects the voltage which corresponds to 200°C (392°F) or more than one second, it is judged that there is an open circuit in the transmission fluid temperature sensor and diagnostic trouble code number "16" is output.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set:
- Malfunction of the transmission fluid temperature sensor circuit
- Damaged of the connector
- Malfunction of the PCM

DIAGNOSIS





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

CAUTION: To prevent damage to the scan tool MB991502, make sure the ignition switch is "OFF" before connecting or disconnecting the scan tool MB991502.

STEP 1. Using scan tool MB991502, check data list item 15: Transmission fluid temperature sensor.
- Drive the vehicle for 15 minutes or more so that the transmission fluid temperature becomes 70 to 90°C (158 to 194°F). The display should be 70 to 90°C."
If the transmission fluid temperature sensor is operating properly, it can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/inspection Service Points.
If the transmission fluid temperature sensor is not operating properly, go to Step 2.

STEP 2. Check the transmission fluid temperature sensor.





1. Disconnect harness connector B-02 and measure at the sensor side.
2. Measure the resistance between terminals 1 and 2.
Standard value:
16.7 - 20.5 k Ohms [at 0°C (32°F)]
0.57 - 0.69 k Ohms [at 100°C (212°F)]
If at the standard value, go to Step 3.
If outside the standard value, replace the transmission fluid temperature sensor. Recheck for DTCs.

STEP 3. Check the power supply circuit at the transmission fluid temperature sensor.





1. Disconnect harness connector B-02 and measure at harness side.
2. Turn the ignition switch "ON."
3. Measure the voltage between terminal 1 and ground.
- Voltage should be approximately 5 volts.
If 5 volts, go to Step 4.
If not 5 volts, go to Step 7.

STEP 4. Check the ground circuit at transmission fluid temperature sensor.





1. Disconnect harness connector B-02 and measure at harness side.
2. Turn the ignition switch "OFF."
3. Check for the continuity between terminal 2 and ground.
- There should be continuity (0 Ohms).
If continuity, go to Step 5.
If no continuity, go to Step 7.

STEP 5. Check the harness connector B-02 for damage.





If the harness connector B-02 is damaged, repair or replace it. Refer to Harness Connector Inspection. Recheck for DTCs.
If harness connector B-02 is in good condition, go to Step 6.

STEP 6. Check harness connectors C-90 and C-92 at the PCM for damage.





If harness connectors C-90 and C-92 are damaged, repair or replace it.
If harness connectors C-90 and C-92 are in good condition, go to Step 7.

STEP 7. Check the harness wire between PCM connectors C-90 and C-92 and harness connector B-02.





NOTE: After inspecting intermediate connector C-96 and joint connector C-71, inspect the wire. If intermediate connector C-96 and joint connector C-71 are damaged, repair or replace it. Refer to Harness Connector Inspection.

If any harness wire between PCM connectors C-90 and C-92 and harness connector B-02 is damaged, repair it. Refer to Harness Connector Inspection. Recheck for DTCs.
If the harness wire is in good condition, recheck for DTCs.
If the malfunction is not eliminated, replace the PCM.

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