DTC P0183: FUEL TANK TEMPERATURE SENSOR
Description
The Fuel Tank Temperature (FTT) sensor is used to detect the fuel temperature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the fuel temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
Possible Causes
DTC P0183 will set when an excessively high voltage from FTT sensor is sent to ECM. Possible causes are:
†FTT sensor circuit open or shorted.
†Defective FTT sensor.
DTC Confirmation Test (DTC P0183)
Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Wait at least 5 seconds. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE. If 1st trip DTC is not detected, system is okay at this time.
Diagnostic Procedure
1. Disconnect fuel pump assembly harness connector. Access cover is located under rear seat. Measure voltage between ground and fuel pump assembly harness connector terminal "T" (Pink/Blue wire). If voltage is about 5 volts, go to step 3. If voltage is not about 5 volts, go to next step.
2. Check the following:
†Check for poor connection at White, 16-pin connector M12 terminal No. 1 (Pink/Blue wire). Connector M12 is located under left side
of instrument panel.
†Check for poor connection at White, 24-pin connector F59 terminal No. 19 (Pink/Blue wire). Connector F59 is located near ECM.
†Check for open or short between fuel pump assembly and ECM.
Repair as necessary.
3. Turn ignition off. Check continuity between body ground and fuel pump assembly harness connector terminal "E" (Black wire). Continuity should exist. Also, check circuit for short to voltage. If problem is found, go to next step. If problem is not found, go to step 5.
4. Check the following:
†Check for poor connection at White, 16-pin connector M12 terminal No. 2 (Black wire). Connector M12 is located under left side of
instrument panel.
†Check for open or short between fuel pump assembly and body ground.
Repair as necessary.
5. Remove fuel pump assembly. Measure resistance between fuel pump assembly connector terminals "T" and "E", with FTT sensor submerged in heated water. Resistance should be within acceptable range shown in
illustration. If resistance is as specified, go to next step. If resistance is not as specified, replace FTT sensor.
6. No problem is indicated at this time. Problem may be intermittent.
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