PINPOINT TEST G531332p40 : FUEL RAIL PRESSURE (FRP) SENSOR CIRCUIT

Pinpoint Tests

PINPOINT TEST G531332p40 : FUEL RAIL PRESSURE (FRP) SENSOR CIRCUIT

G531332t175 : CHECK THE FRP SENSOR SUPPLY CIRCUIT VOLTAGE
1. Key off.
2. Disconnect the FRP sensor electrical connector, PI28.
3. Key on, engine off.
4. Measure the voltage between:

FRP sensor connector Battery
PI28, harness side
Pin 01 Negative terminal

- Is the voltage less than 4 volts?

-> YES
REPAIR the 5 volt supply circuit between the FRP sensor and the ECM. CLEAR the DTC and test the system for normal operation.

-> NO
GO to Pinpoint Test G531332t177.

G531332t177 : CHECK THE FRP SENSOR SIGNAL CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Key off.
2. Measure the resistance between:

FRP sensor connector Battery
PI28, harness side
Pin 03 Negative terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC and test the system for normal operation.

-> NO
GO to Pinpoint Test G531332t178.

G531332t178 : CHECK THE FRP SENSOR SIGNAL CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

FRP sensor connector Battery
PI28, harness side
Pin 03 Positive terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC and test the system for normal operation.

-> NO
GO to Pinpoint Test G531332t179.

G531332t179 : CHECK THE FRP SENSOR SIGNAL CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the ECM sensor electrical connector, PI300.
2. Measure the resistance between:

FRP sensor connector ECM connector PI300,
PI28, harness side harness side
Pin 03 Pin 71

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. CLEAR the DTC and test the system for normal operation.

-> NO
GO to Pinpoint Test G531332t180.

G531332t180 : CHECK THE FRP SENSOR GROUND CIRCUIT FOR HIGH RESISTANCE
1. Measure the resistance between:

FRP sensor connector ECM connector PI300,
PI28, harness side harness side
Pin 02 Pin 10

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. This circuit includes splice PIS49. CLEAR the DTC and test the system for normal operation.

-> NO
INSTALL a new FRP sensor. CLEAR the DTC and test the system for normal operation.