With the ignition switch
in the ON or START position, voltage is applied to the ignition coil. Each
ignition coil consists of two coils. High tension leads go to each
cylinder from the ignition coils. The ignition coils fire two spark plugs
on every power stroke (the cylinder under compression and the cylinder on
the exhaust stroke). The Engine Control Module (PCM) provides a switching
circuit to ground for energizing the primary ignition coils. The PCM uses
the crankshaft position sensor and camshaft position sensor signal to time
the energizing of the coil. When a primary ignition coil is energized and
de-energized, the secondary coil produces a high voltage spike to the
attached spark plugs.
Checking spark timing
under detecting condition, if the actual spark timing differs from the
commanded spark timing, PCM sets this DTC. MIL(Malfunction Indication
Lamp) turns on when the malfunction lasts till consecutive 2 driving
cycle.
Item
|
Detecting
Condition
|
Possible cause
|
DTC
Strategy
|
| •
|
Monitor the spark
timing | |
|
Enable
Conditions
|
| •
|
After engine overnight
soaking |
| •
|
Vehicle is not rapidly accelerating or
decelerating. |
| •
|
11V< Battery Voltage <
16V |
| •
|
NO DTC related to CKPS,Ignition coil,
and Misfire | |
Thresh old
value
|
| •
|
The actual spark timing > the
commanded spark timing + 15° or < the commanded spark
timing -15° | |
Diagnosis
Time
|
| •
|
Within 1 minute after
cold-starting | |
MIL On
Condition
|
|
| 1. |
Check DTC Status
| (1) |
Connect scantool to Data Link
Connector(DLC). |
| (3) |
Select "DTC" button, and then Press "DTC
Status" to check DTC's information from the DTCs
menu. |
| (4) |
Read "DTC Status"
parameter.
|
| (5) |
Is parameter displayed "Present
fault"?
|
|
▶ Go
to "Component Inspection" procedure.
|
|
|
▶
Fault is intermittent caused by PCM memory was not
cleared after repair. Erase DTC and drive the vehicle to
satisfy the enable codition then, go to " System
Inspection"
procedure.
|
| |
■ Check Ignition Coil
| 1. |
IG "OFF" and disconnect ignition coil
connector. |
| 2. |
Measure resistance between power and signal
terminals of ignition coil connector.(Measurement
"A") |
| 3. |
Measure resistance between power terminal of
ignition coil connector and out terminal of secondary ignition
coil.(Measurement "B")
Specification :
Resistance
|
Primary
Coil
|
Secondary
Coil
|
0.62Ω ± 10%
|
7.0kΩ ±
15%
|
|
| 4. |
Is the measured resistance within
specification?
|
|
▶
Substitute with a known - good PCM and check for proper
operation. If the problem is corrected, replace PCM and go to
"Verification of Vehicle Repair" procedure.
|
|
|
▶
Substitute with a known - good Ignition Coil and check for
proper operation. If the problem is corrected, replace
Ignition Coil and go to "Verification of Vehicle Repair"
procedure.
|
|
| Verification Of Vehicle
Repair |
After a repair, it is
essential to verify that the fault has been corrected.
| 1. |
Connect scantool and select "DTC"
button. |
| 2. |
Press "DTC Status" button and confirm that
"DTC Readiness Flag" indicates "Completed". If not, drive the
vehicle within conditions noted in the freeze frame data or enable
conditions |
| 3. |
Read "DTC Status"
parameter |
| 4. |
Is parameter displayed "History(Not Present)
fault"?
|
|
▶ System
performing to specification at this time. Clear the
DTC
|
|
|
▶ Go to the
applicable troubleshooting
procedure.
|
|
