Engine - MIL ON/DTC's P1340 and P1347 Stored in ECM
01 MIL on (DTC P1340 and P1347 stored in ECM)15 10 07
2012600/4
September 10, 2010
Supersedes Technical Service Bulletin Group 15 number 08-10 dated November 18, 2008 for reasons listed below.
AFFECTED VEHICLES
CONDITION
^ MIL on.
^ One or both of the following DTCs are stored in the data memory:
^ P1347 (17755 - Bank 2, Crankshaft-/Camshaft Pos. Sens. Signals Out of Sequence)
^ P1340 (17748 - Crankshaft-/Camshaft Pos. Sens. Signals Out of Sequence)
TECHNICAL BACKGROUND
The upper timing chain might have lengthened.
PRODUCTION SOLUTION
Several improvements have been introduced in the serial production.
SERVICE
If the DTCs listed above are stored in the data memory, the cause might be a lengthened upper timing chain. In order to find that out, the Measuring Value Blocks 208 and 209 need to be checked.
Vehicle requirements:
^ Ignition switched on.
^ VAS 5051/5052 switched on, connected to vehicle and must have sufficient power supply at all times during procedure.
^ Also refer to Required Parts and Tools.
1. Check Measuring Value Blocks 208 and 209.
a. Ensure the engine is running in idle and has past the catalyst warm up mode (increased idle speed).
b. Select Vehicle Self-Diagnosis >> 01 - Engine Electronics >> 08 - Read Measuring Value Block.
c. Switch off the air conditioning and all other electricity consumers.
d. Read Measuring Value Block (Display Group) 208 and 209.
e. Ensure that idle speed is not above 640/min in MVB 208/209 (Figure 1, black arrow).
The measuring value blocks 208 and 209 show the sequence of crankshaft and camshaft for the intake and exhaust camshaft (Figure 1, white arrow) in °KW.
With excessive chain lengthening, the idle values will be below -8.0°KW, or the displayed fields will be empty.
2. If idle value of 208/209 is above or equal to -8° (f.e. -8°...2°):
^ Check the camshaft position sensors and the RPM sensor for malfunction using Guided Fault Finding.
^ Do not perform any repairs on the timing chains.
If idle value of 208/209 is below -8° (f.e. -9°...11°), or if no values are shown:
^ Check the camshaft position sensors and the RPM sensor for malfunction using Guided Fault Finding.
^ If the camshaft position sensors do not show a malfunction, visually check the upper timing chains for excessive lengthening.
Visually check upper timing chains for excessive lengthening
1. Switch engine off.
2. Remove both camshaft position sensors.
3. Adjust cylinder #1 to the TDC position. Use the mark on the pulley.
4. With good upper timing chains, cylinder #1 in TDC and a correctly adjusted valve timing, the control edges of the camshaft adjusters are visible through the openings of the removed camshaft position sensors as shown in Figures 2 and 3.
5. If the control edges of the camshaft adjusters are visible through the holes when cyl. #1 is in TDC, do not replace the upper timing chains.
6. If the control edges of the camshaft adjusters are not visible through the opening when cylinder #1 is in the TDC position, the timing chain is excessively long and the valve timing moves toward retarded. Only turning the crankshaft will make the control edges visible through the camshaft position sensor holes.
In this case, replace the affected upper timing chains.
Warranty
VAS 5051 or VAS 5052 with Basis-CD A.08.01 and the Brand-CD A.08.47 (or later) is required.
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.