Inspection & Adjustment
Nissan Sentra 2007-2012
- There are two different ways to connect a standard timing light. If equipped with a loop wire as shown, simply attach the pick-up clamp and check ignition timing at the crankshaft pulley.
If no loop wire is installed:
Remove No. 4 ignition coil
Check ignition timing at the crankshaft pulley. Timing should be 6°± 5°BTDC (in Neutral), but there is no adjustment.
Nissan Sentra 2007-2012
The ignition timing is not adjustable. If not within specifications, further diagnostic inspection is required. The following procedure is for viewing the ignition timing setting.
Visually check the air cleaner, intake hoses, ducts, Exhaust Gas Recirculation (EGR) valve operation and electrical connections prior to the adjustment of the ignition timing. Correct or repair any problem as required. Be sure to inspect the throttle valve and Throttle Position (TP) sensor for proper operation.
- Before servicing the vehicle, refer to the Precautions Section.
- Locate the timing marks on the crankshaft pulley and the front of the engine.
- Clean the timing marks.
The ignition timing specifications are as follows:
- Using chalk or white paint, color the mark on the crankshaft pulley and the mark on the scale, which will indicate the correct timing when aligned with the notch on the crankshaft pulley.
- Attach a tachometer to the engine.
Attach a timing light to the engine to number 1 cylinder ignition coil wire.
- Turn OFF all the electrical equipment and accessories.
- Check to be sure all of the wires clear the fan, then, start the engine and allow it to reach normal operating temperatures.
- Block the front wheels and set the parking brake. Shift the transmission into NEUTRAL .
Perform the following procedures:
- Race the engine at 2000 rpm for about 2 minutes under a no-load condition; be sure all of the accessories are turned OFF .
- Perform on board engine diagnostics and repair any fault code.
- Race the engine at 2000 rpm for about 2 minutes under a no-load condition.
- Turn the engine OFF and disconnect the TP sensor.
- Start and race the engine 2-3 times under no-load, then run the engine at idle speed.
Aim the timing light at the timing marks. If the marks on the pulley and the engine are aligned when the light flashes, the timing is correct. Turn the engine
and remove the tachometer and the timing light. If the marks are not in alignment, proceed with the following steps:
- Turn the engine OFF .
- Check the Camshaft Position (CMP) sensor (PHASE), Crankshaft Position (CKP) sensor (REF) and CKP sensor (POS). Replace if necessary.
- Check that all the timing chain and gears are correctly aligned.
If the ignition timing is still not correct, substitute a known good Electronic Control Module (ECM).
NOTEThe ECM may be the cause of the problem, but this is rarely the case.
- Turn the engine OFF and remove the tachometer and the timing light.