Fuel system check (Peugeot 406)

During the troubleshooting process, each system code corresponds to a specific element of the system.

Reading trouble codes

Code	Malfunction
Motronic 5.1.1 injection system
11	No faults found
12	Fault setting
13	intake air temperature sensor
14	coolant temperature sensor
15	Fuel pump relay
21	Throttle Potentiometer Position Sensor - Free Contact
31	Free
32	Mixture adjustment
33	Charcoal filter solenoid valve - circuit failure
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	Mixture control
53	Battery voltage
54	ECU relay
56	Immobilizer
71	Cylinder No. 1 Injection Check
72	Cylinder No. 2 Injection Check
73	No. 3 Cylinder Injection Check
74	No. 4 Cylinder Injection Check
Magneti Marelli 8P injection system
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
57	Ignition coil

Examination

1. Check that the wire connections are secure and that there is no corrosion.

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

3. If the simplest check fails to find the cause of the malfunction, it can be written to the memory of the ECU system.

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