P1361-P1376

Diagnostic Codes:
P1361/P1362, P1363/P1364, P1365/P1366
P1371/P1372, P1373/P1374, P1375/P1376

Monitoring Procedure
Two tests on the current monitor signal, when the coils are turned on during normal engine running, check for the lack of, or early, activation, which will imply that the coil was not fully charged when it was fired or that the coil charged too quickly. If either of these tests is not passed then a fault event is recorded and when the limit is reached a fault is registered. The ignition coil driver circuits have a current limiting system which will attempt to maintain ignition coil operation with all fault conditions present.

The strategy will report to the Diagnostic Status Manager (DSM) when an ignition coil fault is present and the DSM will then decide whether to store a fault code and illuminate the MIL lamp.

The six sparking plugs each have individual ignition coils attached which are fitted flush with the camshaft cover and concealed beneath a central cover plate.

Resistance = 0.75 ohm.

Fig. 1:

Interface Between ECM And Coil

Fig. 2:

Coil Characteristics

Ignition Coil No Activation
Ignition Coil Cylinder 1 - No Activation, P1361
Ignition Coil Cylinder 2 - No Activation, P1362
Ignition coil Cylinder 3 - No Activation, P1363
Ignition Coil Cylinder 4 - No Activation, P1364
Ignition Coil Cylinder 5 - No Activation, P1365
Ignition Coil Cylinder 6 - No Activation, P1366

Possible causes:
- Ignition coil open circuit, high resistance or inductance
- Ignition LT harness open circuit or high resistance
- Ignition LT harness short circuit to ground
- Crank sensor problems- "ringing" or radio frequency interference on line
- ECM fault - ignition coil driver
- ECM fault - ignition coil current sensing problem

Ignition Coil Early Activation
Ignition Coil Cylinder 1 - Early Activation, P1371
Ignition Coil Cylinder 2 - Early Activation, P1372
Ignition coil Cylinder 3 - Early Activation, P1373
Ignition Coil Cylinder 4 - Early Activation, P1374
Ignition Coil Cylinder 5 - Early Activation, P1375
Ignition Coil Cylinder 6 - Early Activation, P1376

Possible causes:
- Ignition coil short circuit, low internal resistance or inductance
- Ignition LT harness short circuit
- Ignition coil fault - inter winding short circuit on secondary
- ECM fault - ignition coil driver
- ECM fault - ignition coil current sensing problem