JB - Test
JB: Secondary Ignition
JB: Introduction JB - Introduction
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JB1 VISUAL INSPECTION OF THE IGNITION SYSTEM
- Visually inspect the engine compartment to make sure all the coils are properly and securely connected.
- Examine all the wiring harnesses and connectors for damaged, burned, or overheated insulation, and loose or broken conditions.
- Make sure the vehicle battery is in good condition and all accessories are turned off.
Is a concern indicated?
YES
REPAIR as necessary.
CLEAR the DTCs. REPEAT the self-test.
NO
GO to JB2.
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JB2 DIAGNOSTIC TROUBLE CODE (DTC) P0301 THROUGH P0304: MISFIRE ON CYLINDERS 1 THROUGH 4
Are any of the above listed DTCs present?
YES
GO to JB3.
NO
GO to JB4.
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JB3 CHECK FOR SPARK AT CYLINDER(S) INDICATED BY THE DTC(S)
- Key in OFF position.
- Disconnect the ignition coil(s) from the spark plug(s).
- Connect air gap spark tester 303-D037 (D81P-6666-A) or equivalent to a coil.
- Crank the engine using the engine cranking diagnostic mode. Refer to Diagnostic Modes Diagnostic Modes.
- Observe the spark tester while cranking the engine.
Is a bluish-white spark present?
YES
GO to JB5.
NO
INSPECT the coil boot on the missing cylinder. INSTALL a new coil as necessary. INSPECT the spark plug on the missing cylinder. MEASURE the resistance of the spark plug. INSTALL a new spark plug if the resistance is lower than 2,000 ohms or higher than 20,000 ohms.
GO to Pinpoint Test JF JF - Introduction.
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JB4 CHECK FOR SPARK AT ALL CYLINDERS
- Key in OFF position.
- Disconnect the ignition coil(s) from the spark plug(s).
- Connect the air gap spark tester 303-D037 (D81P-6666-A) or its equivalent to the suspect coil.
- Crank the engine using the engine cranking diagnostic mode. Refer to Diagnostic Modes Diagnostic Modes.
- Observe the spark tester at each cylinder while cranking the engine.
Is a bluish-white spark consistent between all cylinders?
YES
GO to JB5.
NO
INSPECT the coil boot on the missing cylinder. INSTALL a new coil as necessary. INSPECT the spark plug on the missing cylinder. MEASURE the resistance of the spark plug. INSTALL a new spark plug if the resistance is lower than 2,000 ohms or higher than 20,000 ohms.
RECORD cylinder(s) with inconsistent spark.
GO to Pinpoint Test JF JF - Introduction.
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JB5 CHECK THE SPARK PLUGS
- Key in OFF position.
- Remove and inspect the plugs for damage, wear, carbon deposits, and proper plug gap.
Are the plugs OK?
YES
GO to JB6.
NO
ADJUST the gap or INSTALL a new spark plug as necessary.
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JB6 CHECK THE SPARK PLUG RESISTANCE
- Measure the spark plug resistance.
Is the resistance between 2,000 and 20,000 ohms?
YES
GO to JB7.
NO
INSTALL a new spark plug.
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JB7 TEST DIRECTION
Were you directed to this pinpoint test from Symptom Charts?
YES
RETURN to Symptom Charts Symptom Related Diagnostic Procedures for further direction.
NO
GO to JB8.
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JB8 TEST DIRECTION
Were you directed to this pinpoint test from Pinpoint Test Step A6?
YES
GO to A8 A - Test.
NO
The concern is intermittent.
GO to JB9.
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JB9 TEST DIRECTION
Were you directed to this pinpoint test from Pinpoint Test Step HD6?
YES
GO to HD7 HD - Test.
NO
The concern is intermittent.
GO to Pinpoint Test Z Z - Introduction.