Compression Check: Testing and Inspection
COMPRESSIONINSPECT COMPRESSION
(a) Warm up and stop the engine.
HINT: A warmed up engine should have an engine coolant temperature of over 80°C (176°F) and an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized.
(b) Remove the V-bank cover.
(c) Remove the 5 clips and air cleaner inlet cover.
(d) Remove the 8 clips and 2 engine room side covers.
(e) Remove the 2 bolts and No. 1 air cleaner inlet.
(f) Remove the 4 nuts and 2 air cleaner assemblies.
(g) Disconnect the cable from the negative (-) battery terminal.
(h) Remove the battery and tray.
(i) Remove the 3 bolts and skid control ECU.
(j) Remove the bolt, 2 nuts and skid control ECU bracket.
(k) Disconnect the 8 ignition coil connectors.
(l) Disconnect the 2 injector connectors as shown in the illustration.
(m) Remove the 8 bolts and 8 ignition coils.
(n) Remove the 8 spark plugs.
(o) Disconnect the 4 injector connectors as shown in the illustration.
(p) Cylinder under the battery installation position: Inspect the compression pressure.
(1) Insert a compression gauge into the spark plug hole.
(2) Install the battery and tray.
(3) Connect the cable to the negative (-) battery terminal.
(4) Depress and hold the brake pedal, and turn the engine switch on (IG). Then check the compression pressure.
HINT: Always use a fully charged battery to obtain engine speed of 200 rpm or more.
NOTICE: The measurement must be done as quickly as possible.
Standard compression pressure: 1400 kPa (14.2 kgf/cm2, 203 psi) or more
Minimum pressure: 980 kPa (9.9 kgf/cm2, 142 psi)
(5) Turn the engine switch off.
(6) Disconnect the cable from the negative (-) battery terminal.
(7) Remove the battery and tray.
(8) Remove the compression gauge.
(q) Cylinder other than cylinder under the battery installation position:
Inspect the compression pressure.
(1) Insert a compression gauge into the spark plug hole.
(2) Install the battery and tray.
(3) Connect the cable to the negative (-) battery terminal.
(4) Depress and hold the brake pedal, and turn the engine switch on (IG). Then check the compression pressure.
HINT: Always use a fully charged battery to obtain engine speed of 200 rpm or more.
NOTICE: The measurement must be done as quickly as possible.
Standard compression pressure: 1400 kPa (14.2 kgf/cm2, 203 psi) or more
Minimum pressure: 980 kPa (9.9 kgf/cm2, 142 psi)
(5) Remove the compression gauge.
(6) Perform the inspection above for each cylinder.
(7) Check the pressure difference between each compression pressure.
Pressure difference: 100 kPa (1.0 kgf/cm2, 14.5 psi) or less
(8) If the cylinder compression is low in one or more cylinders, pour a small amount of engine oil into the cylinder with low compression through its spark plug hole. Then inspect the cylinder compression pressure again.
HINT:
^ If adding oil helps boost the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
^ If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket.
(9) Disconnect the cable from the negative (-) battery terminal.
(10) Remove the battery and tray.
(r) Connect the 4 injector driver connectors as shown in the illustration.
(s) Install the 8 spark plugs.
(t) Install the 8 ignition coils with the 8 bolts.
(u) Disconnect the 8 ignition coil connectors.
(v) Connect the 2 injector connectors as shown in the illustration.
(w) Install the skid control ECU bracket with the bolt and 2 nuts.
(x) Install the skid control ECU with the 3 bolts.
(y) Install the battery and tray.
(z) Connect the cable to the negative (-) battery terminal.
(aa) Install the 2 air cleaner assemblies with the 4 nuts.
(ab) Install the No. 1 air cleaner inlet with the 2 bolts.
(ac) Install the 2 engine room side covers with the 8 clips.
(ad) Install the air cleaner inlet cover with the 5 clips.
(ae) Install the V-bank cover.
(af) Perform initialization.
NOTICE: Certain systems need to be initialized after reconnecting the cable to the negative (-) battery terminal.
(ag) Clear the DTCs.