Test Procedure
- A1 VERIFY THE ENGINE STARTS
Does the engine start?
Yes No GO to A6. GO to A2 . - A2 CHECK THE VREF CIRCUIT FOR VOLTAGE
- Ignition OFF.
- MAP Sensor connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
(+) MAP Sensor Connector, Harness Side (-) VREF - Pin 3 Ground
Is the voltage between 4.5 - 5.5 V?
Yes No GO to A3 . GO to PINPOINT TEST B . - A3 CHECK FOR VREF VOLTAGE AT THE SENSOR
- Ignition OFF.
- MAP Sensor connector connected.
- FRP Sensor connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
(+) FRP Sensor Connector, Harness Side (-) VREF - Pin 1 Ground
Is the voltage between 4.5 - 5.5 V?
Yes No GO to A4 . GO to PINPOINT TEST B . - A4 CHECK THE RPM
- Ignition OFF.
- FRP Sensor connector connected.
- Access the PCM and monitor the RPM (RPM) PID.
- Crank the engine while monitoring the PID.
Is the RPM greater than 150 RPM?
Yes No GO to A5 . GO to PINPOINT TEST D . - A5 CHECK THE CMP SENSOR
- Access the PCM and monitor the CMP_F (MODE) PID.
- Crank the engine while monitoring the PID.
Is a concern present?
Yes No GO to PINPOINT TEST V . GO to A7. - A6 CHECK THE VPWR VOLTAGE NOTE: An open VPWR circuit concern is indicated by a VPWR PID value greater than 15 V while the engine is running.
- Ignition ON, engine running.
- Access the PCM and monitor the VPWR (VOLT) PID.
Is the voltage less than 15 V?
Yes No GO to A7 . REPAIR the open VPWR circuit.
Clear the PCM DTCs. REPEAT the self-test. - A7 CHECK THE FUEL
- Check for sufficient clean fuel. Refer to HOW TO USE THE DIAGNOSTIC PROCEDURES and carry out the Sufficient Clean Fuel Test.
Is a concern present?
Yes No REPAIR as necessary.
Clear the PCM DTCs. REPEAT the self-test.GO to A8 . - A8 CHECK THE LOW PRESSURE FUEL SYSTEM
- For vehicles with LP_FUEL_SW PID,
- Ignition ON, engine OFF.
- Access the PCM and monitor the LP_FUEL_SW (MODE) PID.
- Access the PCM and control the FPL_CMD (MODE) PID.
- Command the fuel pump ON.
- For all others,
- Ignition OFF.
- Disconnect the injection pump fuel supply tube from the fuel filter to fuel injection pump supply tube quick connect coupling.
- Install the Fuel Line Adapter 310-159 or equivalent and the DSL ENG Pressure Test Kit 014-00761 or equivalent to the fuel filter to fuel injection pump supply tube quick connect coupling at the fuel injection pump supply tube.
- Ignition ON, engine OFF.
- Access the PCM and control the FPL_CMD (MODE) PID.
- Command the FP ON.
Does the PID state change (vehicles with the LP_FUEL_SW PID) or is the low pressure fuel system pressure greater than 379 kPa (55 psi) (all others)?
Yes No GO to A9 . GO to PINPOINT TEST MA . - A9 CHECK THE FUEL PRESSURE
- Access the PCM and monitor the FRP_A (PRESS) PID.
- Crank the engine while monitoring the PID.
Is the pressure greater than 14000 kPa (2030.53 psi)?
Yes No GO to A10 . GO to PINPOINT TEST M . - A10 CARRY OUT A RELATIVE COMPRESSION TEST
- Carry out the Relative Compression test on the scan tool.
Is a concern present?
Yes No REFER to the service information , Engine, Diagnosis and Testing, Engine to DIAGNOSE a base engine concern. RETURN to SYMPTOM CHARTS for further direction.