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Home >> Jeep >> 2005 >> Wrangler X, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Powertrain Diagnostic Procedures >> Diagnostic Information And Procedures >> DRIVEABILITY - NGC - Diagnostic Tests >> P2302-Ignition Coil No. 1 Secondary Circuit-Insufficient Ionization; P2305-Ignition Coil No. 2 Secondary Circuit-Insufficient Ionization; P2308-Ignition Coil No. 3 Secondary Circuit-Insufficient Ionization >> Diagnostic Procedure

Diagnostic Procedure

DIAGNOSTIC PROCEDURE - IGNITION COIL NO. 2 SECONDARY CIRCUIT-INSUFFICIENT IONIZATION

TEST ACTION APPLICABILITY
1 Check for any related TSBs.
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  (Diagnostic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
2 Turn the ignition off.
Disconnect the coil rail harness connector.
Ignition on, engine not running.
With the DRBIII®, actuate the ASD Relay.
Using a 12-volt test light connected to ground, check the (K334) ASD Relay Output circuit at the coil rail harness connector.
Does the test light illuminate brightly?
Yes --> Go To 3
No --> Repair the excessive resistance or short to ground in the (K334 ASD Relay Output circuit. Inspect the related fuse and repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
Stop All Actuations 		 All
3 Turn the ignition off.
Disconnect the coil rail harness connector.
NOTE: The following resistance measurement should be taken at 70-80 degrees F.
NOTE: The resistance of the 2.4L Primary Ignition Coil is 0.53 to 0.63 of an ohm and the resistance of a 4.0L Primary Coil Rail is 0.51 to 0.61 of an ohm at 70°F (21.1°C).

Measure the resistance of the Primary Coil Rail.
Is the resistance value within the noted specification for the coil being tested?
Yes --> Go To 4
No --> Replace the coil rail.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
4 Turn the ignition off.
Disconnect the Ignition Coil Rail harness connector.
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.
Does the test light blink/flicker?
Brightly blinking or flickering.
Replace the Ignition Coil Rail.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
ON constantly.
Go To 5
OFF constantly.
Go To 6		 All
5 Turn the ignition off.
Disconnect the C2 PCM harness connector.
Measure the resistance between the Ignition Coil Driver circuit and ground.
Is the resistance below 100 ohms?
Yes --> Repair the short to ground in the Ignition Coil Driver circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No -->
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Replace and program the Powertrain Control Module in accordance with the Service Information.

Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
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 Ignition Coil Driver circuit from the Coil Rail harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Yes -->
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Replace and program the Powertrain Control Module in accordance with the Service Information.

Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Repair the open in the Ignition Coil Driver circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
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