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:
Steering switch (coupe)
Description
When one of the steering wheel audio control switches is pushed, the
resistance in the steering switch circuit
changes depending on which button is pushed.
Diagnosis Procedure
WITH BLUETOOTH
1.CHECK HARNESS
1. Turn ignition switch OFF.
2. Disconnect Bluetooth control unit con ...
Power window lock switch
Description
Ground circuit of main power window and door lock/unlock switch shuts off if
power window lock switch of
main power window and door lock/unlock switch is operated. This inhibits all
operation, except for the main
switch.
Component Function Check
1. CHECK POWER WINDOW LOCK SIGNA ...
Self-diagnosis function
Diagnosis Description
SELF-DIAGNOSIS SYSTEM
The self-diagnosis system is built into the front air control to quickly
locate the cause of malfunctions.
SELF-DIAGNOSIS FUNCTION
The self-diagnosis system diagnoses sensors, door motors, blower motor, etc.
by system line. Refer to applicable
se ...