Checking the fuel system (Peugeot 406)

During the diagnostic process, when detecting faults, each system code corresponds to a specific element of the system.

Reading fault codes

Code	Malfunction
Injection system Motronic 5.1.1
11	No faults found
12	Installation of a malfunction
13	Intake air temperature sensor
14	Coolant temperature sensor
15	Fuel pump relay
21	Throttle Position Sensor - Free Contact
31	Free
32	Adjusting the mixture
33	Carbon Canister Solenoid Valve - Circuit Damage
34	Carbon Filter Solenoid Valve
35	Throttle Position Sensor
41	Engine speed and crankshaft position sensor
42	Nozzles
43	Knock sensor
44	Knock sensor - other
51	Lambda sensor
52	Regulation of mixture composition
53	Battery voltage
54	ECU relay
56	Immobilizer
71	Checking the injection of cylinder No.1
72	Checking the injection of cylinder No.2
73	Checking the injection of cylinder No.3
74	Checking the injection of cylinder No.4
Injection system Magneti Marelli 8P
11	No faults found
12	Troubleshooting
13	Intake air temperature sensor
14	Coolant temperature sensor
15	Fuel pump relay
21	Throttle Position Sensor
22	Idle speed control motor
27	Vehicle speed sensor
31	Lambda sensor
33	Intake Manifold Pressure Sensor
34	Carbon Filter Solenoid Valve
41	Engine speed and crankshaft position sensor
42	Injector
44	Knock sensor
45	Ignition coil
52	Lambda sensor
53	Battery voltage
54	ECU Block
57	Ignition coil

Examination

1. Check the reliability of the wire connections and the absence of corrosion.



2. Check the condition of the air filter and spark plugs. Check the compression pressure in the engine cylinders.

3. If a simple check fails to detect the cause of the fault, it may be recorded in the ECU system memory.

4. To determine the malfunction, special diagnostic equipment must be connected to the ECU system.