Reading BX Injection Fault Codes

Bosch Motronic ML4.1

BX 16 Valve 87>92 (XU9J4 D6C engine)

11 end of fault code output
12 start of fault code output
14 coolant temp sensor
15 fuel pump circuit
21 throttle position switch (at idle)
22 Idle speed control
33 Airflow sensor (flap)
35 Throttle position switch (full load)
53 battery supply voltage to ECU
54 ECM failure
55 CO Adjuster (part of airflow sensor)

Bosch Motronic M1.3

BX GTi 90>, BX 16v 91>

54 ECM failure
15 Fuel pump circuit/relay
34 Cannister Purge valve solenoid
33 air flow sensor (flap)
52 Lambda sensor signal
42 Injectors
51 Lambda sensor signal
32 "
31 "
53 Battery voltage supply
41 Crank Sensor
13 Air temp sensor (in airflow meter)
21 Throttle position switch at idle
35 Throttle position switch at full load

Bosch Mono Jetronic A2.2

Monopoint injection fitted to BX 1.4i

11 end of fault code output
12 start of fault code output
13 Air Intake temp sensor
14 Coolant temp sensor
21 Idle switch- Throttle Control motor
31 Lambda sensor signal
32 " "
33 Throttle position sensor
41 No engine RPM signal (crank sensor)
51 Lambda sensor signal
52 " "
53 Battery supply voltage to ECM