627 – AL Wiring PWM_CM9
Cause
Corrective action
Disruption or short circuit in
wiring to servomotor of donor
flap M55.
1. Check engine wiring (→ Page 160).
2. Contact Service.
628 – AL Wiring PWM_CM10
Cause
Corrective action
Disruption or short circuit in
wiring to servomotor of EGR
shutoff flap M53.
1. Check engine wiring (→ Page 160).
2. Contact Service.
629 – AL EGR Shutoff Flap A Defect
Cause
Corrective action
The EGR shutoff flap (M53) is
faulty.
1. Check operation of EGR shutoff flap (→ Page 122).
2. Contact Service.
631 – AL Bypass Flap Defect
Cause
Corrective action
The bypass flap (M52) is faulty.
1. Check operation of bypass flap (→ Page 122).
2. Contact Service.
632 – AL Dispenser Flap Defect
Cause
Corrective action
The donor flap (M55) is faulty.
1. Check operation of donor flap (→ Page 122).
2. Contact Service.
633 – SD P-Ambient Air (HDT2800)
Cause
Corrective action
The air pressure sensor (B90)
supplies incorrect signal or no
signal.
1. Check engine wiring (→ Page 160).
2. Contact Service.
634 – SD T0-Ambient Air (HDT2800)
Cause
Corrective action
The temperature sensor (B90)
supplies incorrect signal or no
signal.
1. Check engine wiring (→ Page 160).
2. Contact Service.
635 – SD Air Humidity (HDT2800)
Cause
Corrective action
The humidity sensor (B90)
supplies incorrect signal or no
signal.
1. Check engine wiring (→ Page 160).
2. Contact Service.
62 | Troubleshooting | MS150096/03E 2015-04
TIM-ID: 0000029153 - 010
