Test Db: Engine Fuel Temperature Sensor: Testing
| Fault Code | KOEO | KOER | Continuous Memory | ||
|---|---|---|---|---|---|
| P0180 | DB2 | DB2 | DB8 | ||
| P0181 | DB1 | DB1 | |||
| P0182 1 | DB2 | DB2 | DB8 | ||
| P0183 | DB2 | DB2 | DB7 | ||
|
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- 1) KOEO & KOER DTC P0181: Check For KOER DTCs
This DTC indicates EFT sensor voltage fell below or exceeded a calibrated limit and amount of time during self-test. Check for following possible causes:- Open or Short Circuit In Wiring Harness
- Low Ambient Temperature Operation
- Faulty Harness Connector
- Faulty EFT Sensor
- Faulty PCM
Start engine and bring engine temperature to normal operating temperature. Perform KOER ON-DEMAND SELF-TEST . If DTC P0182 or P0183 is present with DTC P0181, go to next step. If only DTC P0181 is present, clear DTCs. Perform DRIVE CYCLES . Ensure OBD-II DRIVE CYCLE is performed to verify repair. Repeat QUICK TEST . If DTC P0181 is still present, go to next step.
- 2) KOEO & KOER DTC P0180, P0181, P0182 Or P0183: Simulate Opposite EFT Signal To PCM
These DTCs indicate EFT sensor voltage fell below or exceeded a calibrated limit and amount of time during self-test. Check for following possible causes:- Open Or Short Circuit In Wiring Harness
- Low Ambient Temperature Operation
- VREF Open Or Shorted (P0182)
- Open Or Short To PWR (P0183)
- Faulty Wiring Harness Connector
- Faulty EFT Sensor
- Faulty PCM
Turn ignition switch to OFF position. Disconnect EFT sensor connector. With scan tool connected, turn ignition switch to ON position. Using scan tool, access EFTA-V PID from PID/DATA MONITOR & RECORD menu. Record EFTA-V PID reading. Connect jumper wire between EFT and SIG RTN circuit terminals at EFT sensor harness connector. See Fig 1.
Record new EFTA-V PID reading. If EFTA-V PID value is more than 4.5 volts, or -40°F (-40°C) with sensor disconnected and less than .21 volt, or 275°F (135°C) with jumper wire connected, turn ignition switch to OFF position and replace EFT sensor. If EFTA-V PID value is not as specified, turn ignition switch to OFF position and proceed as follows:
- 3) Check VREF Voltage To FRP Sensor
Turn ignition switch to OFF position. Disconnect Fuel Rail Pressure (FRP) sensor connector. Turn ignition switch to ON position. Using a DVOM, measure voltage between VREF and SIG RTN circuits at FRP sensor harness connector. See Fig 2 or Fig 3 . If voltage is 4-6 volts, go to next step. If voltage is not 4-6 volts, go to TEST C, step 1). - 4) Check EFT Circuit For Short To SIG RTN In Harness
Turn ignition switch to OFF position. Ensure EFT sensor is disconnected. Disconnect PCM connector(s). Inspect connector for loose, damaged or corroded terminals. Repair as necessary. Using a DVOM, measure resistance between EFT and SIG RTN circuits at PCM harness connector. See PCM CONNECTOR IDENTIFICATION and Fig 1. If resistance is more than 10 k/ohms, replace PCM. If resistance is 10 k/ohms or less, repair short between circuits. - 5) Check EFT Signal For Short To VREF
Using a DVOM, measure resistance between EFT and VREF circuits at PCM harness connector (both VREF circuits on 150-pin PCM). See PCM CONNECTOR IDENTIFICATION and Fig 1. If resistance is more than 10 k/ohms, go to next step. If resistance is 10 k/ohms or less, repair short between circuits. - 6) Check EFT SIG & SIG RTN Circuits For Open In Harness
Using a DVOM, measure resistance of EFT and SIG RTN circuits between PCM harness connector and EFT sensor harness connector. See Fig 1. If both resistance measurements are less than 5 ohms, replace PCM. If either resistance measurement is 5 ohms or more, repair open in affected circuit. - 7) Continuous Memory DTC P0183: Intermittent Check
These DTCs indicate possible intermittent fault. Possible causes for these faults are:- Faulty Sensor Or Connector
- Faulty Wiring Harness
- Faulty PCM
Turn ignition switch to ON position. Using scan tool, access EFT-A PID from PID/DATA MONITOR & RECORD menu. While observing PID reading, tap on sensor and wiggle sensor connector to simulate road shock. If no change in PID temperature reading occurs, go to next step. If any change in PID temperature reading occurs, inspect connectors for loose, damaged or corroded terminals. Repair as necessary. If connectors are okay, replace EFT sensor.
- 8) Continuous Memory Only DTC P0180 & P0182: Check Sensor Wiring Harness
While observing EFT-A PID, wiggle and bend small sections of wiring harness working from sensor and going toward PCM. If no change in EFT-A PID temperature reading occurs, fault is not present at this time. If a large change in EFT-A PID temperature reading occurs, isolate fault and repair as necessary. Clear DTCs and repeat QUICK TEST .