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Symptom:
P-0351 IGNITION COIL #1 PRIMARY CIRCUIT
When Monitored and Set Condition:
P-0351 IGNITION COIL #1 PRIMARY CIRCUIT
When Monitored: With battery voltage greater than 8 volts during engine cranking or
greater than 12 volts with engine running, and none of the coils in dwell when checked.
Set Condition: Peak current is not achieved with 2.5ms of dwell. It takes 3 seconds during
cranking or up to 6 seconds while running to set.
POSSIBLE CAUSES
ASD OUTPUT CIRCUIT OPEN
IGNITION COIL #1 CONNECTOR TERMINAL OBSERVABLE DEF
IGNITION COIL #1 DRIVER CIRCUIT OPEN
IGNITION COIL #1 DRIVER CIRCUIT SHORTED TO GROUND
IGNITION COIL CIRCUIT WIRING HARNESS INTER DEFECT
IGNITION COIL CIRCUIT WIRING HARNESS OBS DEFECT
IGNITION COIL #1 RESISTANCE ABOVE 2.0 OHMS
PCM DEFECTIVE (IGN COIL #1)
TEST ACTION APPLICABILITY
1 Ignition On, Engine Not Running
With the DRB, read codes.
Is the Global Good Trip displayed and equal to 0?All
Ye s®Go To 2
No®Go To 8
2 Ignition Off
Disconnect the Ignition Coil Connector.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
With the DRB, actuate Ignition Coil #1.
With a Voltmeter, measure the ASD Output Circuit.
Is the voltage above 10.0 volts?All
No®Repair the open ASD Output Circuit.
Perform Powertrain Verification Test VER-5A.
Ye s®Go To 3
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Symptom:
P-0352 IGNITION COIL #2 PRIMARY CIRCUIT
When Monitored and Set Condition:
P-0352 IGNITION COIL #2 PRIMARY CIRCUIT
When Monitored: With battery voltage greater than 8 volts during engine cranking or
greater than 12 volts with engine running, and none of the coils in dwell when checked.
Set Condition: Peak current is not achieved with 2.5ms of dwell. It takes 3 seconds during
cranking or up to 6 seconds while running to set.
POSSIBLE CAUSES
AUTO SHUTDOWN OUTPUT CIRCUIT OPEN
IGNITION COIL #2 CONNECTOR TERMINAL OBSERVABLE DEF
IGNITION COIL #2 DRIVER CIRCUIT OPEN
IGNITION COIL #2 DRIVER CIRCUIT SHORTED TO GROUND
IGNITION COIL CIRCUIT WIRING HARNESS INTER DEFECT
IGNITION COIL CIRCUIT WIRING HARNESS OBS DEFECT
IGNITION COIL #2 DEFECTIVE
PCM DEFECTIVE (IGN COIL #2)
TEST ACTION APPLICABILITY
1 Ignition On, Engine Not Running
With the DRB, read codes.
Is the Global Good Trip displayed and equal to 0?All
Ye s®Go To 2
No®Go To 8
2 Ignition Off
Disconnect the Ignition Coil Connector.
Note: Check connectors - Clean/repair as necessary.
Ignition on, engine not running.
With the DRB, actuate Ignition Coil #2.
With a Voltmeter, measure the ASD Output Circuit.
Is the voltage above 10.0 volts?All
Ye s®Go To 3
No®Repair the open ASD Output Circuit.
Perform Powertrain Verification Test VER-2A.
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Symptom:
P-0353 IGNITION COIL #3 PRIMARY CIRCUIT
When Monitored and Set Condition:
P-0353 IGNITION COIL #3 PRIMARY CIRCUIT
When Monitored: With battery voltage greater than 8 volts during engine cranking or
greater than 12 volts with engine running, and none of the coils in dwell when checked.
Set Condition: Peak current is not achieved with 2.5ms of dwell. It takes 3 seconds during
cranking or up to 6 seconds while running to set.
POSSIBLE CAUSES
ASD OUTPUT CIRCUIT OPEN
IGNITION COIL CONNECTOR #3 TERMINAL OBSERVABLE DEF
IGNITION COIL #3 DRIVER CIRCUIT OPEN
IGNITION COIL #3 DRIVER CIRCUIT SHORTED TO GROUND
IGNITION COIL CIRCUIT WIRING HARNESS INTER DEFECT
IGNITION COIL CIRCUIT WIRING HARNESS OBS DEFECT
IGNITION COIL #3 RESISTANCE NOT ABOVE 2.0 OHMS
PCM DEFECTIVE (IGN COIL #3)
TEST ACTION APPLICABILITY
1 Ignition On, Engine Not Running
With the DRB, read codes.
Is the Global Good Trip displayed and equal to 0?Engine Ð 3.3L V6
and/or 3.8L V6
and/or Engine Ð
3.3L V6 FFV
Ye s®Go To 2
No®Go To 8
2 Ignition Off
Disconnect the Ignition Coil Connector.
Note: Check connectors - Clean/repair as necessary.
Key on.
With the DRB, actuate Ignition Coil #3.
With a Voltmeter, probe the ASD Output Circuit.
Is the voltage above 10.0 volts?Engine Ð 3.3L V6
and/or 3.8L V6
and/or Engine Ð
3.3L V6 FFV
Ye s®Go To 3
No®Repair the open ASD Output Circuit.
Perform Powertrain Verification Test VER-2A.
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Symptom:
P-0403 EGR SOLENOID CIRCUIT
When Monitored and Set Condition:
P-0403 EGR SOLENOID CIRCUIT
When Monitored: With the ignition key on and engine running and battery voltage > 10
volts.
Set Condition: The EGR solenoid control circuit is not in the expected state when
requested to operate by the PCM.
POSSIBLE CAUSES
EGR SOLENOID DEFECTIVE
FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
EGR SOLENOID CIRCUIT WIRING HARNESS INTER DEFECT
EGR SOLENOID CIRCUIT WIRING HARNESS OBSERVABLE DEF
EGR SOLENOID CONTROL CIRCUIT OPEN
EGR SOLENOID CONTROL CIRCUIT SHORT TO GROUND
PCM DEFECTIVE (EGR SOL CKT)
TEST ACTION APPLICABILITY
1 Ignition On, Engine Not Running
With the DRB, read the codes.
Is the Global Good Trip displayed and equal to 0?All
Ye s®Go To 2
No®Go To 7
2 Ignition Off
Disconnect the EGR Solenoid Connector.
Note: Check connectors - Clean/repair as necessary.
Turn ignition on with engine not running.
Using the DRB, actuate the EGR Solenoid.
Using a Voltmeter, probe the Fused Ignition Switch Output Circuit at the EGR
Solenoid Connector.
Is the voltage above 10.0 volts?All
Ye s®Go To 3
No®Repair the open Fused Ignition Switch Output Circuit.
Perform Powertrain Verification Test VER-2A.
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Symptom:
P-0420 1/1 CATALYTIC CONVERTER EFFICIENCY
When Monitored and Set Condition:
P-0420 1/1 CATALYTIC CONVERTER EFFICIENCY
When Monitored: After engine warm up to 63 degrees C (147 degrees F), 180 seconds of
open throttle operation, at a speed greater than 30 Km/h (20 mph), with the engine at
1200-1700 rpm and MAP vacuum between 15.0 and 21.0 inches of mercury (Hg).
Set Condition: As catalyst efficiency deteriorates, the switch rate of the downstream O2
sensor approaches that of the upstream O2 sensor. If at any point during the test the
switch ratio reaches a predetermined value a counter is incremented by one.
POSSIBLE CAUSES
EXHAUST LEAK
ENGINE MECHANICAL PROBLEM
CATALYTIC CONVERTER DEFECTIVE
UPSTREAM O2 SENSOR OLDER THAN DOWNSTREAM O2 SENSOR
CATALYST EFFICIENCY FAILURE DOES NOT REOCCUR
TEST ACTION APPLICABILITY
1 With the DRB, read the DTCs.
Is the GLOBAL GOOD TRIPS counter displayed and equal to zero?All
Ye s®Go To 3
No®Go To 2
2 At this time the Catalyst Efficiency Failure does not exist or is an intermittent
problem.
With the DRB, read the FREEZE FRAME DATA.
With this screen, attempt to duplicate the condition that has set this fault.
While using FREEZE FRAME DATA pay particular attention to the fault setting
conditions, such as speed, temp, load, and map vacuum.
Does the Catalyst Efficiency Failure Reoccur?All
Ye s®Go To 3
No®The Catalytic Conveter Efficiency Failure no longer exists.
Perform VERIFICATION TEST VER-5A3.
3 Start Engine and let idle.
Check for exhaust leaks between the Engine and the appropriate Downstream O2
Sensor.
Are there any exhaust leaks?All
Ye s®Repair or replace leaking exhaust parts as necessary.
Perform VERIFICATION TEST VER-5A3.
No®Go To 4
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TEST ACTION APPLICABILITY
4NOTE: Check the exhaust for excessive smoke from internal oil or coolant
leaks.
Is there an oil or coolant consumption condition present?All
Ye s®Repair engine mechanical as necessary and replace Catalytic
Converter.
Perform VERIFICATION TEST VER-5A3.
No®Go To 5
5NOTE: A new Downstream O2 Sensor along with an aging Upstream O2
Sensor may cause this trouble code to set.
Review vehicle repair history.
Has the Downstream O2 Sensor been replaced without replacing the Upstream O2
Sensor?All
Ye s®Replace the appropriate Upstream Oxygen Sensor.
Perform VERIFICATION TEST VER-5A3.
No®Replace the Catalytic Converter.
Perform VERIFICATION TEST VER-5A3.
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P-0420 1/1 CATALYTIC CONVERTER EFFICIENCY ÐContinued
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Symptom:
P-0441 EVAP PURGE FLOW MONITOR FAILURE
When Monitored and Set Condition:
P-0441 EVAP PURGE FLOW MONITOR FAILURE
When Monitored: With engine temperature greater than 170ÉF, engine in closed loop,
engine idling for 2 minutes, no low fuel, MAP less than 15.7 inches mercury, and
barometric altitude less than 8,000 feet.
Set Condition: Note: with LDP: must pass stricter evap system test first. No air flow
through the evaporative system is detected by the evap monitor.
POSSIBLE CAUSES
PURGE CANISTER LINE DAMAGED
PURGE SOLENOID AND CANISTER DEFECTIVE
PURGE SOLENOID DEFECTIVE
VACUUM HOSES DAMAGED OR PLUGGED
EVAP PURGE MONITOR FAILURE DOES NOT REOCCUR
TEST ACTION APPLICABILITY
1 With the DRB, read the DTCs.
Is the GLOBAL GOOD TRIP counter displayed and equal to zero?All
Ye s®Go To 3
No®Go To 2
2 At this time the Evap Purge Flow Monitor Failure does not exist or is an intermittent
problem.
With the DRB, read the FREEZE FRAME DATA.
With these screens, attempt to duplicate the condition that has set this fault.
While using FREEZE FRAME pay particular attention to the fault setting condi-
tions, such as speed, temp, load, and map vacuum.
Does the Evap Purge Flow Monitor Failure reoccur?All
Ye s®Go To 3
No®The Evap Purge Flow Monitor failure no longer exists.
Perform VERIFICATION TEST VER-5A3.
3NOTE: Carefully inspect all vacuum hoses for proper routing and for
pinched or plugged hoses from the engine to the solenoid to the gas tank.
Are all vacuum hoses OK?All
Ye s®Go To 4
No®Repair the vacuum hoses as necessary.
Perform VERIFICATION TEST VER-5A3.
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TEST ACTION APPLICABILITY
4 To continue testing you will need Miller Tool Kit #6872A, #8382 and #6904 Ultrasonic
Leak Detector.
NOTE: The Fuel Tank must have 1/2 tank of fuel to perform this test.
Perform Evaporative System Pressure Pump Self Test that is specified on the tester
cover.
Warning: Verify the vehicle fuel tank contains at least 3 gallons of fuel.
Attach the DRB III to the vehicle.
Turn the Key On.
At: ENGINE SYSTEM TESTS select: LEAK DETECTION PUMP TEST.
Read instructions and then press ENTER.
At: LEAK DETECTION PUMP TEST select #3 HOLD PSI.
At the vacuum hose going to the LDP, attach and apply a continuous vacuum (i.e. 209
Hg).
Remove Gas Cap.
Install 8382 on the Gas Cap and on the vehicle.
Attach the supply hose from 6872A to 8382.
Attach the power source from the 6872A, clip to Battery(+) and ground clip to
Battery(-).
Set Pressure Hold to Open and set Vent to Open.
Turn Pump Timer On.
To prevent noise from interfering with test, move tool #6872 away from vehicle.
Using the Ultrasonic Leak Detector, start listening for leaks at Gas Cap then proceed
to Rollover Valve, Canister, Leak Detection Pump, and Evap Purge Solenoid.
Were any leaks heard with the Ultrasonic Leak Detector?All
Ye s®Repair or replace leaking component.
Perform VERIFICATION TEST VER-6A.
No®Replace Leak Detection Pump.
Perform VERIFICATION TEST VER-6A.
5 At this time, the condition required to set the code is not present.
Using the schematic as a guide, inspect the wiring, connectors and hoses.
Were any problems found?All
Ye s®Repair as necessary.
Perform VERIFICATION TEST VER-6A.
No®Test Complete.
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P-0442 EVAP LEAK MONITOR SMALL LEAK DETECTED ÐContinued
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