Town & Country V6-3.8L (2009)
Ignition Coil: Testing and Inspection
CHECKING THE IGNITION COIL OPERATION
For a complete wiring diagram refer to the Wiring Information. See: Diagrams/Electrical Diagrams
1. IGNITION COIL WIRING OR CONNECTORS
NOTE: Diagnose and repair any ignition coil, CMP sensor, or CKP sensor DTCs before proceeding with this test.
1. Turn the ignition off.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Ignition Coil for the cylinder being tested and the
PCM.
3. Look for any chafed, pierced, pinched, or partially broken wires.
4. Look for broken, bent, pushed out or corroded terminals.
NOTE: If the vehicle is not equipped with the coil on plug ignition system, check the resistance of the ignition wire(s) before checking the
cylinder with a spark tester. The resistance should be below 10k ohms.
Were any problems found?
Yes
-
Repair as necessary.
-
Perform the PCM Verification Test. See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated
Procedures/Verification Tests/PCM Verification Test.
No
-
Go To 2
2. IGNITION COIL OPERATION
NOTE: Inspect the ignition coil for damage, carbon tracking on the coil or a damaged spark plug insulator boot. If a problem is found,
replace the ignition coil.
NOTE: Some coils must have a spark tester installed on both sides of the coil during the following test. During the test, each side of the coil
should output a crisp blue spark that is able to jump the gap of the spark tester.
NOTE: On some engines, it may be necessary to remove the upper intake manifold to access the ignition coils. Once the ignition coil has been
removed, the intake must be installed in order to crank the engine. Move the ignition coil harness connector through the slots in the
upper intake and then connect the coil to the harness connector. Secure the upper intake to the lower intake.
1. Turn the ignition off.
2. If the vehicle is equipped with coil on plug ignition system, remove the ignition coil for the cylinder being tested.
3. Disconnect the fuel injector harness connector for the cylinder being tested.
4. For coil on plug ignition systems, install a spark tester(s) on the ignition coil, otherwise install the spark tester to the ignition wire.
5. While cranking the engine observe the spark coming from the spark tester.
NOTE: A crisp blue spark that jumps the gap of the spark tester should be generated.
Is good spark present?
Yes
-
Go To 7
No
-
Go To 3
3. MAIN/ASD RELAY OUTPUT CIRCUIT OPEN OR HIGH RESISTANCE
1. Turn the ignition off.
2. Disconnect the Ignition Coil harness connector.
3. Turn the ignition on.
