2019 BMW 128i Convertible (E88) L6-3.0L (N51) A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts Page 123
Condition for fault identification
Test condition:
Terminal change and request for adaptation
Terminal condition: Terminal 15 ON
Voltage condition:
Voltage in onboard electrical system >= 10 V
Condition for fault memory entry
none
Action in service
1) Check engine-management fuses (5-fuse holder in
EBOX), 2) Check: The sum of throttle valve voltages must
equal 5 V,
3) Perform electrical check on wiring to throttle valve
sensors and throttle valve motor,
4) Visual inspection of plug-in contacts (at component,
wiring harness and DME),
5) Replace component
Fault effect and breakdown warning
Driver information
Warning light:
CC status report: Reduced engine performance!,
MIL ON
EMB + rpm limit 1300 rpm
Service instruction
none
2CFC - P1634 (DME)
2CFC - P1634
Information saved in
DME
Fault code
2CFC - P1634
Fault text
Throttle valve, start check
Fault description
Throttle Valve Adaptation Spring Test Failed (Bank 1)
Condition for fault identification
Test condition:
Switch terminals
Terminal condition: Terminal 15 ON
Voltage condition:
Voltage in onboard electrical system >= 10 V
Condition for fault memory entry
1 sec.
Action in service
1) Check engine-management fuses (5-fuse holder in EBox),
2) Perform electrical check on wiring to throttle valve
sensors and throttle valve motor,
3) Visual inspection of plug-in terminals (at components,
wiring harness and DME),
4) Replace component
Fault effect and breakdown warning
