If using COP coil on plug system, I alway's find it better to replace all coils at the same time as they seem to breakdown in sequence. Try replacing CMP (camshaft position sensor) located on front engine below ignition coil. CKP (crankshaft position sensor) located front center of engine below right side of water pump
INTEGRATED ELECTRONIC IGNITION SYSTEM
NOTE:Ignition timing is controlled by the Powertrain Control Module (PCM) and is not adjustable. DO NOT attempt to check base timing as false readings will result.
Integrated Electronic Ignition (EI) system consists of a crankshaft position sensor, coil pack(s), wiring, and PCM. Coil On Plug (COP) integrated EI system uses a separate coil for each spark plug and each coil is mounted directly onto spark plug. COP integrated EI system eliminates need for spark plug wires but does require input from camshaft position sensor.
Coil Pack(s)
The Electronic Ignition (EI) system consists of a Crankshaft Position (CKP) sensor, coil pack(s), related wiring and PCM. The CKP sensor is used by the PCM to indicate crankshaft position and speed by sensing a missing tooth on a pulse wheel mounted on front of crankshaft. The coil pack receives the signal from the PCM to fire at a calculated spark target. Each coil within the pack fires 2 spark plugs at the same time.
The plugs are paired so one plug is fired on the compression stroke, and the other plug fires the mating cylinder, which is on the exhaust stroke. On the next cycle, firing is reversed. On 6-tower coil pack applications the matched cylinder pairs are: No. 1 and 5, No. 2 and 6, and No. 3 and 4. See Fig. 19 and Fig. 20.
On dual 4-tower coil pack applications (8 cylinder), the matched cylinder pairs are No. 1 and 6, No. 3 and 5, No. 4 and 7, and No. 2 and 8. See Fig. 21. On single 4-tower coil pack applications (4 cylinder), the matched cylinder pairs are No. 1 and 4, and No. 2 and 3. See Fig. 21.
The PCM acts as an electronic switch to ground in the coil primary circuit. When the switch is closed, positive battery voltage applied to the coil primary circuit builds a magnetic field around the primary coil. When the switch opens, power is interrupted and the primary field collapses inducing high voltage in the secondary coil winding and the spark plug is fired.
Coil On Plugs
The Electronic Ignition (EI) system consists of a Crankshaft Position (CKP) sensor, Camshaft Position (CMP) sensor, individual Coil On Plugs (COPs), related wiring and PCM. Individual COPs are mounted directly on the spark plugs. See Fig. 8. The CKP sensor is used by the PCM to indicate crankshaft position and speed by sensing a missing tooth on a pulse wheel mounted on front of crankshaft. The CMP sensor is used by the PCM to identify when piston No. 1 is at Top Dead Center (TDC) of compression stroke. This signal is used to synchronize firing of individual coils.
The individual coils receive their signal from the PCM to fire at a calculated spark target. Only one coil is fired at a time and only on the compression stroke. The PCM acts as an electronic switch to ground the individual coil primary circuit. When the switch is closed, battery voltage applied to the coil primary circuit builds a magnetic field around the primary coil. When the switch opens, power is interrupted and the primary field collapses, inducing high voltage in the secondary coil winding and the spark plug is fired.
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Wednesday, November 26th, 2008 AT 5:58 AM
