DTC P0183. Chevrolet Chevrolet T-Series Medium Duty Truck F6/F7/F8 2003

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2003 🢒 Chevrolet T-Series Medium Duty Truck F6/F7/F8 🢒 DTC 🢒 DTC P0183

DTC P0183 Without RPO CTF

Circuit Description

The fuel temperature sensor (FTS) is a thermistor. The engine control module (ECM) supplies the FTS a reference voltage of 5 volts on the signal circuit and also provides a ground circuit to the sensor. When the FTS is cold, the resistance is high. The FTS signal voltage remains near the supplied voltage cold and decreases the signal voltage as the sensor warms. The control module monitors the FTS signal circuit in order to calculate the temperature of the fuel entering the engine. If the ECM detects an excessively high FTS voltage, a low temperature indication, this DTC will set.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The FTS temperature is less than -50°C (-58°F) for 2 seconds.

Action Taken When the DTC Sets

The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

Conditions for Clearing the MIL/DTC

•	The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.

•	A current DTC, Last Test Failed, clears when the diagnostic runs and passes.

•	Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

•	If a short to a separate 5-volt source occurs, this diagnostic trouble code (DTC) may set. If this is the problem, a continuity test to all other ECM circuits will be necessary in order to diagnose the specific circuit.

•	Before starting a cold engine, the FTS should be within a few degrees of the manifold air temperature (MAT) reading

•	Use the Temperature vs. Resistance table in order to test the FTS at various temperature levels and in order to evaluate the possibility of a skewed sensor.

•	If the condition is suspected of being intermittent, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

If DTC P0183 can only be repeated by duplicating the Failure Records, refer to the Temperature vs Resistance table. The table may be used to test the FTS at various temperatures to evaluate the possibility of a shifted sensor that may be shorted above or below a certain temperature. If this is the case, replace the FTS. If the FTS appears to be OK, the malfunction is intermittent. Refer to Diagnostic Aids.

Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.

The ECM in this vehicle uses an electrically erasable programmable read-only memory (EEPROM). If the PCM is replaced, the new ECM must be programmed.

Step

Action

Values

Yes

Schematic Reference: Engine Controls Schematics

Did you perform the Diagnostic System Check-Engine Controls?

Go to Step 2

Go to Diagnostic System Check - Engine Controls

Install a scan tool.
Turn ON the ignition, with the engine OFF.
Use the scan tool in order to observe the FTS temperature.

Does the FTS temperature measure less than the specified value?

-50°C (-58°F)

Go to Step 4

Go to Step 3

Observe the Freeze Frame/Failure Records data for this DTC.
Turn OFF the ignition for 30 seconds.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC or as closely as possible to the Freeze Frame/Failure Records conditions.

Does the DTC reset?

Go to Step 4

Go to Diagnostic Aids

Turn OFF the ignition.
Disconnect the FTS.
Connect a 3-amp fused jumper between the signal circuit of the FTS and the low reference circuit. Refer to Using Fused Jumper Wires in Wiring Systems.
Turn ON the ignition, with the engine OFF.
Use the scan tool in order to observe the FTS temperature.

Does the FTS temperature measure more than the specified value?

138°C (280°F)

Go to Step 8

Go to Step 5

Turn OFF the ignition.
Connect a 3-amp fused jumper between the signal circuit of the FTS and ground.
Turn ON the ignition, with the engine OFF.
Use the scan tool in order to observe the FTS temperature.

Does the FTS measure more than the specified value?

138°C (280°F)

Go to Step 7

Go to Step 6

Test the signal circuit of the FTS for the following conditions:

•	A short to voltage

•	A high resistance

•	An open circuit

Repair the circuit as necessary. Refer to Circuit Testing and refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 9

Test the reference low circuit of the FTS for a high resistance or an open.
Repair the circuit as necessary. Refer to Circuit Testing , and refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 9

Inspect for poor connections at the harness connector of the FTS.
Repair the connections as necessary. Refer to Circuit Testing and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 10

Inspect for poor connections at the harness connector of the ECM. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Repair the connections as necessary. Refer to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 11

Replace the FTS. Refer to Fuel Temperature Sensor Replacement .

Did you complete the replacement?

Go to Step 12

Replace the ECM. Refer to Engine Control Module Replacement/Restore Fuel Rate Data .

Did you complete the replacement?

Go to Step 12

Use the scan tool in order to clear the DTCs.
Turn OFF the ignition for 30 seconds.
Start the engine.
Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC run and pass?

Go to Step 13

Go to Step 2

With the scan tool, observe the stored information, Capture Info.

Does the scan tool display any DTCs that you have not diagnosed?

Go to Diagnostic Trouble Code (DTC) List

System OK