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Slow start, jerkiness and reduced driveability

Symptom: The engine does not start or takes a long time to start. Jerkiness and reduced drivability may also occur.

Slow start, jerkiness and reduced driveability

Fault symptom

The engine does not start or takes a long time to start. Jerkiness and reduced drivability may also occur.

Conditions

In many cases, DTC P0346 is shown, indicating implausible values from the crankshaft and camshaft position sensors. This is because the cam belt tensioner can be slack, resulting in the engine control module making incorrect calculations of the two sensor values.

Diagnostic procedure




1. Check the tension of the belt tensioner by pulling it back with a 10 mm Allen key. See Cam belt cover with belt, idler pulley and belt tensioner (in-vehicle)

2. If the belt tensioner does not spring back there is too little tension left. If so, change the belt tensioner.