On Board Diagnostics II PCED

1999 PCED On Board Diagnostics II

SECTION 5: Pinpoint Tests

JF: Integrated Ignition Coil On Plug Coil 1 Through 10 Failure

JF1 DETERMINE WHICH COIL IS NOT FIRING

Note: Electronic ignition engine timing is entirely controlled by the PCM. Electronic ignition timing is NOT adjustable. Do not attempt to check base timing. You will receive false readings.

Determine which coil is not firing using information from Pinpoint Test JB or DTC and the table at the beginning of this pinpoint test.
Record cylinder, coil and PCM pin number from the table.

Have the cylinder number, coil driver and PCM pin number been recorded?

Yes	No
GO to JF2 .	To obtain required information, REPEAT JF1 .

JF2 DTC P0351, P0356, P0357: CRANKSHAFT POSITION SENSOR FAILURE

Are any of the above listed DTCs present?

Yes	No
GO to JF3 .	GO to JF4 .

JF3 CHECK RESISTANCE OF CRANKSHAFT POSITION SENSOR

Measure resistance of crankshaft position sensor.

Is resistance between 290 and 390 ohms?

Yes	No
GO to JF4 .	REPLACE crankshaft position sensor. COMPLETE Misfire Monitor Repair Verification Drive Cycle (Refer to Section 2 , Drive Cycles).

JF4 CHECK FUNCTIONALITY OF SUSPECT COIL DRIVER (CD) CIRCUIT

Disconnect suspect coil (determined from the table).
Connect incandescent test lamp between IGN START/RUN and suspect CD circuit (determined from the table) at the coil on plug harness connector.
Disable fuel pump by disconnecting inertia fuel shutoff switch.
Observe incandescent test lamp while cranking engine.

Is the test lamp blinking consistently?

Yes	No
KEY OFF. GO to JF5 .	KEY OFF. GO to JF6 .

JF5 CHECK FUNCTIONALITY OF SUSPECT COIL

Remove suspect coil (determined from the table) from spark plug.
Connect an air gap spark tester 303-D037 (D81P-6666-A) or equivalent to a suspect coil.
Reconnect suspect coil harness connector.
Observe spark tester while cranking engine.

Is the spark present?

Yes	No
KEY OFF. INSPECT spark plug, REPLACE if necessary. GO to Pinpoint Test Step Z1 .	KEY OFF. REPLACE coil. INSPECT spark plug, REPLACE if necessary. COMPLETE Misfire Monitor Repair Verification Drive Cycle (Refer to Section 2 , Drive Cycles).

JF6 CHECK IGN START/RUN VOLTAGE TO SUSPECT COIL

Key on, engine off.
Measure voltage between IGN START/RUN circuit at the coil on plug harness connector and ground.

Is voltage greater than 10.0 volts?

Yes	No
KEY OFF. GO to JF7 .	KEY OFF. LS6 and LS8 : GO to Pinpoint Test Step B5 . All others : IGN START/RUN circuit fault. 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).

JF7 CHECK SUSPECT CD CIRCUIT FOR OPEN IN HARNESS

Disconnect PCM.
Measure resistance of suspect CD circuit between PCM harness connector pin (determined from the table) and coil on plug harness connector.

Is resistance less than 5 ohms?

Yes	No
GO to JF8 .	REPAIR open circuit. COMPLETE Misfire Monitor Repair Verification Drive Cycle (Refer to Section 2 , Drive Cycles).

JF8 CHECK SUSPECT CD CIRCUIT FOR SHORT TO VPWR IN HARNESS

Key on, engine off.
Measure voltage between suspect CD circuit at the PCM harness connector (determined from the table) and ground.

Is voltage less than 1.0 volt?

Yes	No
KEY OFF. GO to JF9 .	KEY OFF. REPAIR short circuit. COMPLETE Misfire Monitor Repair Verification Drive Cycle (Refer to Section 2 , Drive Cycles).

JF9 CHECK SUSPECT CD CIRCUIT FOR SHORT TO GROUND IN HARNESS

Disconnect scan tool.
Measure resistance between suspect CD circuit at the PCM harness connector (determined from the table) and ground.

Is resistance greater than 10,000 ohms?

Yes	No
GO to JF10 .	REPAIR short circuit. If symptom or DTC is still present, GO to JF11 to check for damaged coil, otherwise COMPLETE Misfire Monitor Repair Verification Drive Cycle (Refer to Section 2 , Drive Cycles).

JF10 PERFORM INTERMITTENT TEST ON SUSPECT CD CIRCUIT HARNESS

Connect digital multimeter between suspect CD circuit at the PCM harness connector (determined from the table) and CD circuit at coil on plug harness connector.
Wiggle and bend CD harness from PCM harness connector to coil on plug harness connector.

Did resistance fluctuate during wiggle test?

Yes	No
REPAIR intermittent fault in harness. COMPLETE Misfire Monitor Repair Verification Drive Cycle (Refer to Section 2 , Drive Cycles).	REPLACE PCM. (Refer to Section 2 , Flash EEPROM.) If symptom or DTC is still present, GO to JF11 to check for damaged coil, otherwise COMPLETE Misfire Monitor Repair Verification Drive Cycle (Refer to Section 2 , Drive Cycles).

JF11 CHECK SUSPECT COIL FOR DAMAGE

Remove suspect coil (determined from the table) from spark plug.
Connect an air gap spark tester 303-D037 (D81P-6666-A) or equivalent to a suspect coil.
Disable fuel pump by disconnecting inertia fuel shutoff switch.
Observe spark tester while cranking engine.

Is the spark present?

Yes	No
KEY OFF. INSPECT spark plug, REPLACE if necessary. GO to Pinpoint Test Step Z1 .	KEY OFF. REPLACE coil. INSPECT spark plug, REPLACE if necessary. COMPLETE Misfire Monitor Repair Verification Drive Cycle (Refer to Section 2 , Drive Cycles).