DTC P018B-P018D
Diagnostic Instructions
DTC Descriptors
DTC P018B: Fuel Pressure Sensor Performance
DTC P018C: Fuel Pressure Sensor Circuit Low
Voltage
DTC P018D: Fuel Pressure Sensor Circuit High
Voltage
Diagnostic Fault Information
Circuit
|
Short to Ground
|
Open/High Resistance
|
Short to Voltage
|
Signal Performance
|
5 V Reference
|
P018C, P0641
|
P018C
|
P018D, P0641
|
P06A6
|
Signal
|
P018C
|
P018C
|
P018D
|
P018B
|
Low Reference
|
-
|
P018D
|
-
|
P06A6
|
Circuit/System Description
The fuel pressure sensor is located on the fuel line. The fuel
pressure sensor monitors the fuel pressure in the fuel line. The
fuel pump control module monitors the voltage signal from the fuel
pressure sensor.
Conditions for Running the DTC
• |
DTC P018C, P018D, P0231, P0232, P023F, P064A,
P1255 or P06A6 are not active. |
• |
DTC P0641 has not failed this ignition
cycle. |
• |
Fuel pump control is enabled and the fuel pump
control state is normal. |
• |
The engine has been running for at least
5 seconds. |
Conditions for Setting the DTC
The fuel pump control module does not detect a change in the
fuel rail pressure of at least 30 kPa (4.4 psi) when the
fuel pump is operating at its minimum or maximum voltage limits for
over 5 seconds.
Action Taken When the DTC Sets
DTC P018B, P018C and P018D are Type A DTCs.
Conditions for Clearing the DTC
DTC P018B, P018C and P018D are Type A DTCs.
Diagnostic Aids
Using the Failure Records data may help locate an intermittent
condition. If you cannot duplicate the DTC, the information in the
Failure Records can help determine how many miles since the DTC
set. The Fail Counter and Pass Counter can help determine how many
ignition cycles that the diagnostic test reported a pass and/or a
fail.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Fuel System Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Note: Verify that the fuel tank
is not empty. Only perform this diagnostic if there is at least 2
gallons of fuel in the fuel tank. Clear the DTC, and start and run
the engine. Verify that the DTC P0118B resets before
proceeding with the circuit system testing. If the DTC does not
reset, refer to diagnostic aids.
- Ignition OFF, disconnect the harness connector at the
B47 fuel pressure sensor.
- Ignition OFF and all vehicle systems OFF. It may take
up to 2 minutes for all vehicle systems to power down. Test
for less than 10 Ω between the low reference circuit terminal
2 and ground.
⇒ |
If greater than the specified range, test the low
reference circuit for an open/high resistance. If the circuit tests
normal, replace the K27 fuel pump flow control module. |
- Ignition ON, test for 4.8-5.2 V between the
B47 fuel pressure sensor 5 V reference circuit
terminal 3 and ground.
⇒ |
If less than the specified range, test the
5 V reference circuit for a short to ground or an open/high
resistance. If the circuit tests normal, replace the K27 fuel
pump flow control module. |
⇒ |
If greater than the specified range, test the
5 V reference circuit for a short to voltage. If the circuit
tests normal, replace the K27 fuel pump flow control
module. |
- Verify the scan tool fuel pressure sensor voltage is
less than 1 V.
⇒ |
If greater than the specified range, test the
signal circuit terminal 1 for a short to voltage. If the
circuit tests normal, replace the K27 fuel pump flow control
module. |
- Install a 3 A fused jumper wire between the
signal circuit terminal 1 and the 5 V reference circuit
terminal 3. Verify the scan tool fuel pressure sensor voltage is
greater than 4.8 V.
⇒ |
If less than the specified range, test the signal
circuit for a short to ground or an open/high resistance. If the
circuit tests normal, replace the K27 fuel pump flow control
module. |
- If all circuits test normal, replace the B47 fuel
pressure sensor.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the repair.
Control Module References for fuel pump control module
replacement, programming and setup
|