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Home >> Jeep >> 2005 >> Wrangler X, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 488 (Powertrain Diagnostic Procedures - Gas) >> Diagnostic Information And Procedures >> DRIVEABILITY - NGC - Diagnostic Tests >> P2302-Ignition Coil No. 1 Secondary Circuit- Insufficient Ionization (3.7L); P2305-Ignition Coil No. 2 Secondary Circuit- Insufficient Ionization (3.7L); P2308-Ignition Coil No. 3 Secondary Circuit- Insufficient Ionization (3.7L); P2311-Ignition Coil No. 4 Secondary Circuit- Insufficient Ionization (3.7L); P2314-Ignition Coil No. 5 Secondary Circuit- Insufficient Ionization (3.7L); P2317-Ignition Coil No. 6 Secondary Circuit- Insufficient Ionization (3.7L) >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
P2302-IGNITION COIL NO. 1 SECONDARY CIRCUIT- INSUFFICIENT IONIZATION (3.7L) DIAGNOSTIC TEST REFERENCE

TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIII®, read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
Yes --> Go To 2
No --> Refer to the INTERMITTENT CONDITION SYMPTOM .
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 ENGINE - 3.7L POWER TECH V6
2 Turn the ignition off.
Disconnect the coil on plug harness connector.
Ignition on, engine not running.
With the DRBIII®, actuate the ASD Relay.
Using a 12-volt test light connected to ground, probe the (A142) ASD Relay Output circuit at the Coil on plug harness connector.
Does the test light illuminate brightly when the Relay is actuating?
Yes --> Go To 3
No --> Go To 8
CAUTION: Stop All Actuations
 ENGINE - 3.7L POWER TECH V6
3 Turn the ignition off.
NOTE: The following resistance measurement should be taken at 70-80 degrees F.

Measure the primary resistance of the Coil on plug.
Is the resistance between 0.6 and 0.9 of an ohm?
Yes --> Go To 4
No --> Replace the coil on plug.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 ENGINE - 3.7L POWER TECH V6
4 Using a 12-volt test light connected to a 12-volt source, probe the Ignition Coil Driver circuit.
Crank the engine for 5 seconds while observing the test light.
What is the condition of the test light while cranking the engine?
Brightly blinking.
Replace the Ignition Coil.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
ON constantly.
Go To 5
OFF constantly.
Go To 6		 ENGINE - 3.7L POWER TECH V6
5 Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between the Coil Control circuit and ground in the Coil on plug harness connector.
Is the resistance below 5.0 ohms?
Yes --> Repair the short to ground in the Coil Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 7		 ENGINE - 3.7L POWER TECH V6
6 Turn the ignition off.
Disconnect the C2 PCM harness connector.
CAUTION: DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

Measure the resistance of the Coil Control circuit from the Coil on plug connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes --> Go To 7
No --> Repair the open in the Coil Control circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 ENGINE - 3.7L POWER TECH V6
7
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.If there are no possible causes remaining, review repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 ENGINE - 3.7L POWER TECH V6
8 Turn the ignition off.
Remove the ASD Relay from the PDC.
Measure the resistance of the (A142) ASD Relay Output circuit between the Relay Output terminal of the PDC and the Coil on Plug harness connector.
Is the resistance below 5.0 ohms?
Yes --> Go To 9
No --> Repair the open in the (A142) ASD Relay Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 ENGINE - 3.7L POWER TECH V6
9
NOTE: Repeat the following test for both capacitors
NOTE: The Capacitors are attached to the side of each valve cover.
Turn the ignition off.Disconnect the Capacitor harness connector.Install a good INJ/COIL fuse.With the DRBIII®, actuate the ASD Relay.
NOTE: If the above test result is an open fuse for both capacitor tests, the problem is a short to ground in the (A142) ASD Relay Output circuit. Repair the short to ground in the (A142) ASD Relay Output circuit and refer to POWERTRAIN VERIFICATION TEST VER - 5 
Is the INJ/COIL fuse OK for both capacitor tests?Yes --> Replace the Capacitor(s)Perform POWERTRAIN VERIFICATION TEST VER - 5 .No --> Repair the short to ground in the (A142) ASD Relay Output circuit.Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 ENGINE - 3.7L POWER TECH V6
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