Engine Controls System: 131501
131501 - P052BInformation saved in
DME
Fault code
131501 - P052B
Fault text
VANOS, inlet, cold start: not controllable
Fault description
The diagnostic function monitors adjustment of the intake-
side camshaft during the catalytic converter's warm-up
phase.
Condition for fault identification
Test condition:
The fault is recognized when the camshaft cannot be
adjusted to the specified position.
Potential problem source(s):
- Contaminated oil passage at VANOS solenoid valve
- Oil pressure too low
- Defective wires or plug terminals on VANOS solenoid
valve
- VANOS solenoid valve seized
- VANOS solenoid valve defective
Terminal condition: none
Voltage condition:
- Onboard electrical system voltage between 9 V and 16 V
Temperature condition:
- Engine cold start to ensure that catalyst heater is active.
Time condition:
- None
Other conditions:
- Engine ON
Condition for fault memory entry
The diagnostic fault code is logged when the fault remains present for longer than 1 min.
Action in service
- Check oil level, change engine oil and filter as indicated
- If faults related to the camshaft position sensor have been
logged, repair these first
- Check wiring harness between VANOS solenoid valve and
DME
- Perform system test
- Check camshaft and VANOS unit for freedom of
movement and mechanical damage
- Clean VANOS solenoid valve, replace as required
Fault effect and breakdown warning
Breakdown notice:
The engine reverts to its emergency limp-home program,
continued vehicle operation is possible, because power is
reduced the driver should refrain from passing maneuvers.
Possible apparent symptoms:
- Engine runs poorly
Driver information
Warning light:
MY10 ECE:
- ECE emissions warning lamp: on
- ECE electronic engine power reduction: off
- CC message: on
MY10 US:
- US emissions warning lamp: on
- US electronic engine power reduction: on
- CC message: on
Service instruction
None