Diagnosis and check 2.7L (Discovery 3)

Inspection and verification

CAUTION: DO NOT perform any fuel system repairs while the engine is running. The fuel pressure in the system can reach 1600 bar. Failure to follow this instruction may result in injury.

WARNING: Be sure to wear eye protection when working with or in the vicinity of any fuel related items. Failure to follow this instruction may result in injury.

CAUTION: This procedure is related to fuel handling. Always be aware of the possibility of fuel splashing and observe fuel safety precautions. Failure to follow this instruction may result in injury.

CAUTION: After repair work is completed, the fuel system must be visually inspected for leaks. This should be done after the engine has been running, but with the engine off. Failure to follow this instruction may result in injury.

WARNING: If swallowed, DO NOT induce vomiting. Seek immediate medical attention. Failure to follow this instruction may result in injury.

WARNING: If fuel gets in your eyes, rinse them with cold water or special eyewash solution and seek medical attention. Failure to follow this instruction may result in injury.

WARNING: Wash hands thoroughly after handling as prolonged contact may cause irritation. If irritation occurs, seek medical attention. Failure to follow this instruction may result in injury.

CAUTION: Before disconnecting any element of the fuel system, be sure to remove all dust and dirt around the elements to prevent dirt from entering the fuel system. Failure to follow this instruction may result in damage to the vehicle.

CAUTION: The fuel lines between the injectors and the fuel rail must be discarded after each use and new lines installed. Failure to follow this instruction may result in damage to the vehicle.

ATTENTION: Therefore, absolute cleanliness must be observed when working with these elements. Open holes or lines should always be plugged with appropriate plugs. Failure to follow this instruction may result in damage to the vehicle.

WARNING: As thoroughly as possible, clean and dedust the workshop area where the vehicle is being worked on. Areas where work is being done on clutches, brakes, or welding or machining is not suitable due to the risk of contamination of the fuel system. Failure to follow this instruction may result in damage to the vehicle.

WARNING: All protective clothing used must be clean and made of lint-free fabric. Failure to follow this instruction may result in damage to the vehicle.

WARNING: Make sure that the protective gloves used are new, made from latex and have not been dusted with talc. Failure to follow this instruction may result in damage to the vehicle.

WARNING: Use only clean, non-plated tools. Tools should be cleaned before working on the vehicle with a new brush that does not shed bristles and fresh cleaning agent. Failure to follow this instruction may result in damage to the vehicle.

CAUTION: Use a workbench with a steel top that should be covered with a clean, lint-free cloth. Failure to follow this instruction may result in damage to the vehicle.

1. Make sure the customer's complaint is valid.

2. Visually inspect for obvious mechanical and electrical problems.

Mechanical factors	Electrical Factors
Fuel level Fuel contamination Fuel supply line (s) Fuel return line (s) Fuel supply line (s) high pressure Fuel tank filler line leak (And) fuel Fuel tank Fuel filler cap Fuel filter Push Fittings fuel manifold High pressure fuel pump Exhaust gas recirculation system (EGR)	Charging and battery status Melting (e) fuse (And) Inertial fuel switch (IFS) Fuel Pump Module Relay fuel pump module electrical connector (s) Damaged or corroded wiring harness Fuel control valve (FVCV) Fuel pressure control valve (FPCV) Engine control module (ECM)

3. If an obvious cause of a problem you identified or described by a customer is found, resolve it before proceeding to the next steps (if possible).

4. Use an approved diagnostic system or scan tool (tester), to retrieve all DTCs before referring to the symptom table or DTC index (DTC).

Clear all DTCs after troubleshooting.

Symptom table

Symptom	Possible reasons	Action
Engine cranks but won't start	Inertial fuel switch (IFS) Low/contaminated fuel Fuel Pump Module Malfunction Low pressure in the fuel system Air leak Clogged fuel filter Plugged/contaminated fuel control valve (FVCV) Plugged/dirty fuel pressure valve (FPCV) High pressure fuel pump malfunction crankshaft position sensor (CKP) ECM malfunction	Check if the inertial switch is activated. Check fuel level/condition. Check fuel pump module operation, check fuel system low pressure circuit for leaks/damage. Check air intake system for leaks. Check fuel filter, check FVCV and FPCV. Check high pressure fuel pump. Check the CKP sensor. Refer to the relevant section in the workshop manual. If there is any doubt about the functionality of the module, refer to the Warranty Policy and Procedures Manual.
Difficulty starting	Glow plug system malfunction (very cold conditions) Low/contaminated fuel Fuel Pump Module Malfunction Low pressure in the fuel system Air leak Clogged fuel filter Plugged/contaminated fuel control valve (FVCV) Plugged/dirty fuel pressure valve (FPCV) EGR valve malfunction (EGR)	Check the electrical circuits of the glow plugs. Check fuel level/condition. Check fuel pump module operation, check fuel system low pressure circuit for leaks/damage. Check air intake system for leaks. Check fuel filter, check FVCV and FPCV. Check EGR valves. Refer to the relevant section in the workshop manual.
Uneven idle operation	Low/contaminated fuel Low pressure in the fuel system Air leak Clogged fuel filter Plugged/contaminated fuel control valve (FVCV) Plugged/dirty fuel pressure valve (FPCV) EGR valve malfunction (EGR)	Check fuel level/condition. Check the fuel system low pressure circuit for leaks/damage. Check air intake system for leaks. Check fuel filter, check FVCV and FPCV. Check EGR valves. Refer to the relevant section in the workshop manual.
Loss of power on acceleration	Air intake system malfunction Plugged catalytic converter Low fuel pressure EGR valve malfunction (EGR) Turbocharger failure	Check the air intake system. Check the exhaust system for leaks or blockages. If necessary, install new components and parts. Check the pressure in the fuel system. Check EGR valves. Check the condition of the turbocharger and the operation of the actuator. Refer to the relevant section in the workshop manual.
Engine stops/stops	Low/contaminated fuel Fuel Pump Module Malfunction Low pressure in the fuel system High pressure fuel leak Air leak Plugged/contaminated fuel control valve (FVCV) Plugged/dirty fuel pressure valve (FPCV) EGR valve malfunction (EGR)	Check fuel level/condition. Check fuel pump module operation, check fuel system for leaks/damage. Check air intake system for leaks. Check FVCV and FPCV. Check EGR valves.
Engine jerking	Low/contaminated fuel Low pressure in the fuel system High pressure fuel leak Air leak Plugged/contaminated fuel control valve (FVCV) Plugged/dirty fuel pressure valve (FPCV) High pressure fuel pump malfunction	Check fuel level/condition. Check the fuel system for leaks/damage. Check air intake system for leaks. Check FVCV and FPCV. Check high pressure fuel pump. Refer to the relevant section in the workshop manual.
Increased fuel consumption	Low pressure in the fuel system High pressure fuel leak Leak in fuel temperature sensor Plugged/contaminated fuel control valve (FVCV) Plugged/dirty fuel pressure valve (FPCV) Fuel injector malfunction EGR valve malfunction (EGR)	Check the fuel system for leaks/damage. Check FVCV and FPCV. Check for injector related DTCs. Check EGR valves. Refer to the relevant section in the workshop manual.

DTC index

NOTE: Universal Scan Tools cannot read the listed codes or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7 digit code to identify the problem (the last 2 digits give additional information read by the diagnostic system approved by the manufacturer).

NOTE: See Section 303-14 for a complete list of ECM DTCs "Electronic engine management system" in the workshop manual.

DTC	Description	Possible reasons	Action
P008700	Fuel rail/system pressure too low	Fuel rail pressure sensor (FRP) disconnected Signal circuit from FRP sensor to ECM - short circuit to ground FRP Sensor Power Circuit High Resistance FRP Sensor Malfunction Fuel line leak Reducing the capacity of the fuel line Fuel pump module circuit high resistance Fuel Pump Module Circuit Short to Ground Fuel Pump Module Malfunction Fuel control valve malfunction Pressure control valve failure	Refer to the electrical manual and check the fuel rail pressure sensor circuits. Fuel rail pressure sensor checks are described in the relevant section of the workshop manual. Check fuel system low pressure lines for leaks/damage. Check the pressure in the fuel system. Check the circuits and operation of the low pressure fuel pump module. Check fuel manifold and high pressure fuel line for leaks. Check for VCV and PCV DTCs and repair if necessary.
P008800	Fuel rail/system pressure too high	Wiring from fuel rail pressure sensor (FRP) to ECM (nutrition / perception): short circuit to each other Signal circuit between FRP sensor and ECM short circuit to voltage FRP Sensor Malfunction Fuel pressure valve malfunction (FPCV) Fuel pump module circuit short to voltage Fuel Pump Module Malfunction	Check the electrical circuits of the FRP sensor and the FPCV valve. Refer to the relevant section in the workshop manual. Check the electrical circuits of the fuel pump module. Refer to the electrical manual.
P062700	Fuel pump A control circuit open	Fuel Pump Module Relay Control Circuit Short to Battery Fuel Pump Module Relay Malfunction	Check fuel pump and electrical circuits. Refer to the electrical manual. Activate the relay and listen to "click". See the relevant section of the workshop manual. Repair/replace as needed. Clear DTCs and check for correct operation.
P062800	Fuel Pump A Control Circuit Low Voltage	Fuel pump module relay control circuit high resistance Fuel Pump Module Relay Control Circuit Short to Ground Fuel Pump Module Relay Malfunction	Refer to the electrical manual and check the fuel pump electrical circuits. Activate the relay and listen to "click". Repair/replace as needed. Clear DTCs and check for correct operation.
P062900	High voltage in the fuel pump A control circuit	Fuel pump module relay control circuit high resistance Fuel Pump Module Relay Malfunction	Refer to the electrical manual and check the fuel pump electrical circuits. Activate the relay and listen to "click". Repair/replace as needed. Clear DTCs and check for correct operation.
P226900	The presence of water in the fuel	The presence of water in the fuel Water in Fuel Sensor Circuit Short to Ground Malfunction of the gauge of presence of water in fuel	Drain the condensate from the fuel filter. Clear the DTCs and recheck. If the DTC resets, check the sensor circuit. Refer to the electrical manual. If no faults were found in the electrical circuits, install a new sensor.
P228800	Injector control pressure too high	Fuel pressure control valve minimum limit reached (FPCV) Nozzle control pressure too high FPCV Electrical Circuit Malfunction FPCV failure Fuel pump module circuit short to voltage Fuel Pump Module Malfunction High pressure fuel pump malfunction	Check the fuel pressure, see the relevant section of the workshop manual. Check the fuel pump module and FPCV circuits. Refer to the electrical manual. High pressure fuel pump and FPCV checks are described in the relevant section of the workshop manual.
P229000	Injector control pressure too low	Maximum limit of fuel pressure control valve reached (FPCV) Nozzle control pressure too low Fuel line leak Reducing the capacity of the fuel filter / fuel system FPCV Electrical Circuit Malfunction FPCV failure Fuel Pump Module Circuit Short to Ground Fuel Pump Module Malfunction High pressure fuel pump malfunction	Check the pressure in the fuel system. Check fuel lines for leaks/damage. Check for blockage/reduction in the fuel filter. Check the electrical circuits of the fuel pump module. Refer to the electrical manual. Check the FPCV electrical circuits. Check high pressure fuel pump. See the relevant section of the workshop manual.
P229200	Injector control pressure fluctuations	Fuel injector control pressure: erratic FPCV Electrical Circuit Malfunction FPCV failure Fuel pump module circuit high resistance, short circuit to ground, short circuit to power Fuel Pump Module Malfunction High pressure fuel pump malfunction	Check the fuel pressure, see the relevant section of the workshop manual. Check the fuel pump module and FPCV circuits. Refer to the electrical manual. High pressure fuel pump and FPCV checks are described in the relevant section of the workshop manual.