John Deere 157.16 – ECU: Fuel Rail Pressure Signal Moderately High

The engine control system detects that the actual fuel rail pressure is moderately above the normal or desired pressure parameters.

• 5085E
• 5090E
• 5090EL
• 5100E
• 5065M
• 5075M
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 5090M
• 5115M
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 8R Series
• 9230-9630
• 624K
• 370E
• 410E
• 460E

1. 1

   Scan Tool Data Logging: Use John Deere Service Advisor to graph Actual vs. Desired Fuel Rail Pressure to confirm the high-pressure condition under load or at higher RPMs.

2. 2

   Return Line Restriction Check: Disconnect the fuel return line and measure the return flow at RPM to eliminate the possibility of a downstream restriction.

3. 3

   Cylinder Balance Test: Perform a cylinder performance/balance test to check for injector deviation (cylinders should ideally be within 2% of each other).

4. 4

   Wiring Load Test: Load test the wiring harnesses going to the Suction Control Valve (SCV) and the Fuel Rail Pressure (FRP) sensor.

5. 5

   Check the Suction Control Valve (SCV): Inspect for internal suction control pin wear that could cause it to hang up and over-pressurize the rail.

1. 1

   Change Fuel Filters

   Change the low-pressure fuel filters and re-test the machine.

2. 2

   Replace the Suction Control Valve (SCV)

   If the rail pressure hangs up during operation, replace the SCV.

3. 3

   Replace the Pressure Relief Valve (PRV)

   If the pressure relief valve is lifting prematurely or failing to vent excess pressure, replace the valve and its solenoid.

4. 4

   Replace the Fuel Rail Pressure Sensor

   If the wiring is good but the sensor is misreading at the higher end of the pressure spectrum, replace the sensor.

5. 5

   Test/Replace Injectors

   If the problem persists after addressing the SCV and PRV, pull the fuel injectors and send them to a specialized fuel injection shop to be tested for sticking.