On Board Diagnostics II PCED

1999 PCED On Board Diagnostics II

SECTION 5: Pinpoint Tests

JB: Secondary Ignition

JB1 VISUAL INSPECTION OF IGNITION SYSTEM

Visually inspect the engine compartment to make sure all coils and spark plug wires are properly and securely connected.
Examine all wiring harnesses and connectors for damaged, burned or overheated insulation and loose or broken conditions.
Be certain the battery is fully charged.
All accessories must be off during diagnosis.

Is a problem indicated?

Yes	No
REPAIR as necessary. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycle).	For coil pack application using engine analyzer: GO to JB2 . For coil pack applications not using engine analyzer: GO to JB20 . For coil on plug applications: GO to JB15 .

JB2 CONNECT ENGINE ANALYZER

Obtain Rotunda Series 100 Engine Analyzer 010-01060 or equivalent to diagnose concerns in the secondary side of the ignition system.

Note: In order for the diagnostic procedures to provide accurate results, it is essential that the calibration of the engine analyzer be maintained. Refer to the equipment manual for the procedure to calibrate the engine analyzer. If the equipment manual is not available, an estimate of the calibration can be made by connecting the Spark Tester D81P-6666-A or equivalent to a properly operating ignition system and measuring the firing voltage of the spark tester only. The spark tester firing voltage should be approximately 28KV.

Is the engine analyzer connected?

Yes	No
GO to JB3 .	REPEAT JB2 .

JB3 CHECK FOR IGNITION PATTERN

Observe pattern on scope while cranking engine.

Is the pattern flat which indicates no spark on all cylinders?

Yes	No
IGN START/RUN circuit concern. KEY OFF. CHECK condition of related fuses/fuse links. If OK, REPAIR open circuit. If fuse/fuse link is damaged, CHECK IGN START/RUN circuit for short to ground. REPAIR as necessary. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycles).	GO to JB4 .

JB4 CHECK FOR NORMAL IGNITION PATTERN

Note: Spark plugs are fired up to four strikes per firing. Multi-strike operating mode is dependent on the PCM calibration and is limited to less than 2000 rpm. Above 2000 rpm, spark plugs are fired once per firing.

Key on, engine running.
Check spark plug firing voltage average and evenness of patterns.

Are the patterns even and is the average value of spark plug firing voltage 20KV or less with evenness of spark plug firing voltage 8KV or less?

Yes	No
If you were directed to this Pinpoint Test from Section 3, RETURN to Section 3 . If you were directed to this Pinpoint Test from Pinpoint Test Step HD5 , RETURN to Pinpoint Test Step HD6 . If you were directed to this Pinpoint Test from Pinpoint Test Step A6 , RETURN to Pinpoint Test Step A7 . All others GO to Pinpoint Test Step Z1 .	GO to JB5 .

JB5 CHECK FOR TWO MISSING SPARK PATTERNS ON THE SAME COIL

Observe pattern on scope.

Is the spark pattern missing from two cylinders on the same coil?

Yes	No
INSPECT spark plug wires and spark plugs for missing cylinders. MEASURE resistance of spark plug wires. REPLACE if greater than 7,000 ohms per 30.5 cm (1 foot). Measure resistance of spark plugs. REPLACE if lower than 2000 or higher than 2000 ohms. If spark plug wires and spark plugs are OK, GO to Pinpoint Test Step JE1 .	GO to JB6 .

JB6 CHECK FOR ONE MISSING SPARK PATTERN

Observe pattern on scope.

Is spark pattern missing from one cylinder?

Yes	No
INSPECT spark plug wire and spark plug for missing cylinder. MEASURE resistance of spark plug wire. REPLACE if greater than 7,000 ohms per 30.5 cm (1 foot). MEASURE resistance of spark plug. REPLACE if lower than 2000 or higher than 20000 ohms. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycles).	GO to JB7 .

JB7 CHECK FOR HIGH SPARK PLUG FIRING VOLTAGE

Check the spark plug firing voltage average and evenness.

Is the average value of spark plug firing voltage greater than 20KV with evenness of spark plug voltage 8KV or less?

Yes	No
Conditions affect all cylinders. INSPECT spark plug wires and spark plugs. MEASURE resistance of spark plug wires. REPLACE if greater than 7,000 ohms per 30.5 cm (1 foot). CHECK spark plug gaps. MEASURE resistance of spark plugs. REPLACE if lower than 2000 or higher than 20000 ohms. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycles).	GO to JB8 .

JB8 CHECK FOR LOW SPARK PLUG FIRING VOLTAGE

Check the spark plug firing voltage average and evenness.

Is there consistently low spark plug firing voltage or sloping spark line on one or more cylinders?

Yes	No
INSPECT spark plug wire and spark plugs. MEASURE resistance of spark plug wires. REPLACE if greater than 7,000 ohms per 30.5 cm (1 foot). MEASURE resistance of spark plugs. REPLACE if lower than 2000 or higher than 20000 ohms. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycles).	GO to JB9 .

JB9 CHECK FOR EVENESS BETWEEN CYLINDERS

Check the spark plug firing voltage average and evenness.

Is the evenness of spark plug firing voltage greater than 8KV?

Yes	No
Inspect spark plug wires and spark plugs. MEASURE resistance of spark plug wires. REPLACE if greater than 7,000 ohms per 30.5 cm (1 foot). CHECK for damaged spark plugs or narrow spark plug gaps. MEASURE resistance of spark plugs. REPLACE if lower than 2000 or higher than 20000 ohms. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycles).	GO to Pinpoint Test Step Z1 .

JB15 DTC P0301 THROUGH P0310: MISFIRE ON CYLINDERS 1 THROUGH 10

Are any of the above listed DTCs present?

Yes	No
GO to JB16 .	GO to JB17 .

JB16 CHECK FOR SPARK AT CYLINDER(S) INDICATED BY DTC(S)

Disable inertia switch.
Disconnect ignition coil(s) from spark plug(s).
Connect a Spark Tester 303-D037 (D81P-6666-A) or equivalent to a coil.
Check for spark while cranking engine.

Is the bluish-white spark present?

Yes	No
KEY OFF. GO to JB18 .	KEY OFF. INSPECT spark plugs for missing cylinders. MEASURE resistance of spark plugs. REPLACE if lower than 2000 or higher than 20000 ohms. GO to Pinpoint Test Step JF1 .

JB17 CHECK FOR SPARK AT ALL CYLINDERS

Disable inertia switch.
Using a Spark Tester 303-D037 (D81P-6666-A) or equivalent, check for spark at each cylinder while cranking engine.

Is the bluish-white spark consistent between all cylinders?

Yes	No
KEY OFF. GO to JB18 .	KEY OFF. INSPECT spark plugs for missing cylinders. MEASURE resistance of spark plugs. REPLACE if lower than 2000 or higher than 20000 ohms. Record cylinders with inconsistent spark and GO to Pinpoint Test Step JF1 .

JB18 CHECK SPARK PLUGS

Remove and check plugs for damage, wear, carbon deposits and proper plug gap.

Are plugs OK?

Yes	No
GO to JB19 .	REPAIR plugs. ADJUST gap or REPLACE as necessary. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycles).

JB19 CHECK SPARK PLUG RESISTANCE

Measure spark plug resistance.

Is resistance between 2000 and 20000 ohms?

Yes	No
If you were directed to this Pinpoint Test from Section 3, RETURN to Section 3 . If you were directed to this Pinpoint Test from Pinpoint Test Step HD5 , RETURN to Pinpoint Test Step HD6 . If you were directed to this Pinpoint Test from Pinpoint Test Step A6 , RETURN to Pinpoint Test Step A7 . All others GO to Pinpoint Test Step Z1 .	REPLACE spark plugs. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycles).

JB20 DTC P0301 THROUGH DTC P0310: MISFIRE ON CYLINDERS 1 THROUGH 10

Are any of the above listed DTCs present?

Yes	No
GO to JB21 .	GO to JB22 .

JB21 CHECK FOR SPARK AT CYLINDER(S) INDICATED BY DTC(S)

Disable inertia switch.
Disconnect spark plug wire(s) from spark plug(s).
Connect a Spark Tester 303-D037 (D81P-6666-A) or equivalent to a spark plug wire.
Check for spark while cranking engine.

Is the bluish-white spark present?

Yes	No
KEY OFF. GO to JB23 .	KEY OFF. INSPECT spark plug wires. MEASURE resistance of spark plug wires. REPLACE if greater than 7,000 ohms per 30.5 cm (1 foot). COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycles). If spark plug wires are OK, GO to Pinpoint Test JE1 .

JB22 CHECK FOR SPARK AT ALL CYLINDERS

Disable inertia switch.
Using a Spark Tester 303-D037 (D81P-6666-A) or equivalent, check for spark at each cylinder while cranking engine.

Is the bluish-white spark consistent between all cylinders?

Yes	No
KEY OFF. GO to JB23 .	KEY OFF. INSPECT spark plug wires. MEASURE resistance of spark plug wires. REPLACE if greater than 7,000 ohms per 30.5 cm (1 foot). COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycles). If spark plug wires are OK, GO to Pinpoint Test JE1 .

JB23 CHECK SPARK PLUGS

Remove and check plugs for damage, wear, carbon deposits and proper plug gap.

Are plugs OK?

Yes	No
GO to JB24 .	REPAIR plugs. ADJUST gap or REPLACE as necessary. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycles).

JB24 CHECK SPARK PLUG RESISTANCE

Measure spark plug resistance.

Is resistance between 2000 and 20000 ohms?

Yes	No
If you were directed to this Pinpoint Test from Section 3, RETURN to Section 3 . If you were directed to this Pinpoint Test from Pinpoint Test Step HD5 , RETURN to Pinpoint Test Step HD6 . If you were directed to this Pinpoint Test from Pinpoint Test Step A6 , RETURN to Pinpoint Test Step A7 . All others GO to Pinpoint Test Step Z1 .	REPLACE spark plugs. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2 , Drive Cycles).