Nissan Altima 2007-2012 Service Manual: Compression pressure
On-Vehicle Service
CHECKING COMPRESSION PRESSURE
1. Run the engine until it reaches normal operating temperature.
2. Turn the ignition switch to OFF.
3. Release fuel pressure and leave the fuel pump electrically disconnected.
Refer to EC-1579, "Inspection".
4. Remove all six spark plugs.
Refer to EM-119, "Removal and Installation".
5. Attach a compression tester to No. 1 cylinder.
6. Depress accelerator pedal fully to keep the electric throttle control actuator butterfly-valve wide open to maximize air intake flow.
7. Crank the engine and record the highest gauge indication
8. Repeat the measurement on each cylinder (steps 5 - 7).
• Always use a fully-charged battery to obtain specified engine speed.
9. If compression in one or more cylinders is low: a. Pour a small amount of engine oil into cylinders through the spark plug holes.
b. Retest compression (steps 5 - 8).
• If adding oil helps raise compression pressure, then the piston rings may be worn or damaged. If so, replace piston rings after checking piston.
• If the pressure stays low, a valve may be sticking or is seating improperly. Inspect and repair the valve and/or valve seat. Refer to EM-229, "Camshaft". If the valve and/or valve seat is damaged excessively, replace as necessary.
• If compression stays low in two or more cylinders that are next to each other: - The cylinder head gasket may be leaking.
- Both cylinders may have valve component damage. Inspect and repair as necessary.
Camshaft valve clearance
Valve Clearance
CHECKING
• Perform inspection as follows after removal, installation or replacement
of camshaft or valve related parts, or if there is unusual
engine conditions regarding valve c ...
Other materials:
Child safety rear door
Child safety locks help prevent the rear doors
from being opened accidentally, especially when
small children are in the vehicle.
The child safety lock levers are located on the
edge of the rear doors.
When the lever is in the unlock position 2 , the
door can be opened from the outside o ...
Headlamp (xenon)
Description
The IPDM E/R (intelligent power distribution module engine room) controls the
headlamp low relay based on
inputs from the BCM over the CAN communication lines. When the headlamp low
relay is energized, power
flows through fuses 51 and 52, located in the IPDM E/R. Power then ...
P0340, P0345 CMP sensor (phase)
Description
The camshaft position sensor (PHASE) senses the protrusion of
camshaft (INT) to identify a particular cylinder. The camshaft position
sensor (PHASE) senses the piston position.
When the crankshaft position sensor (POS) system becomes inoperative,
the camshaft position sensor (PHAS ...