Jeep XJ. Manual — part 839
Symptom:
P0353-IGNITION COIL # 3 PRIMARY CIRCUIT
When Monitored and Set Condition:
P0353-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, engine rpm less than 2016, and none of the coils
in dwell when checked.
Set Condition:
Peak current is not achieved with battery based dwell plus 1.5 msec of
diagnostic offset. It takes less than 3 seconds during cranking or up to 6 seconds while
running to set.
POSSIBLE CAUSES
OPEN/HIGH RESISTANCE IN THE ASD RELAY OUTPUT CIRCUIT
IGNITION COIL NO. 3 DRIVER CIRCUIT OPEN
COIL RAIL
IGNITION COIL NO. 3 DRIVER CIRCUIT SHORTED TO GROUND
WIRING HARNESS INTERMITTENT
POWERTRAIN CONTROL MODULE (IGNITION COIL NO. 1 DRIVER)
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
Is the Good Trip Counter displayed and equal to zero for P0353?
4.0L MPI I-6
Yes
→
No
→
2
Turn the ignition off.
Disconnect the coil rail harness connector.
Note: The following resistance measurement should be taken at 70-80
degrees F.
Measure the primary resistance of the coil rail.
Is the resistance between 0.6 and 0.9 ohms?
4.0L MPI I-6
Yes
→
No
→
Replace the coil rail.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
117
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the coil rail harness connector.
Turn the ignition on.
With the DRBIII
t, actuate the generator field.
Using a 12-volt test light connected to ground, check the ASD relay output circuit at
the coil rail harness connector.
Does the test light illuminate brightly?
4.0L MPI I-6
Yes
→
No
→
Repair the open/high resistance in the ASD relay output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Stop All Actuations
4
Turn the ignition off.
Disconnect the coil rail harness connector.
Connect one end of a 12 volt test light to a good 12 volt source (B+).
Warning: Keep clear of the engine’s moving/rotating parts.
Check the ignition coil no. 3 driver circuit, with the other end of the test light, while
cranking the engine.
Does the test light blink/flicker?
4.0L MPI I-6
Yes
→
Test Complete.
No
→
5
Turn the ignition off.
Disconnect the coil rail harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance of the ignition coil no. 3 driver circuit from the ignition coil
connector to the PCM connector.
Is the resistance below 5.0 ohms?
4.0L MPI I-6
Yes
→
No
→
Repair the open ignition coil no. 3 driver circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
Turn the ignition off.
Disconnect the coil rail harness connector.
Disconnect the PCM harness connector(s).
Measure the resistance between the ignition coil no. 3 driver circuit and ground (B-).
Is the resistance below 5.0 ohms?
4.0L MPI I-6
Yes
→
Repair the ignition coil no. 3 driver circuit shorted to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
7
If there are no possible causes remaining, view repair.
4.0L MPI I-6
Repair
Replace the Powertrain Control Module.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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DRIVEABILITY - GAS
P0353-IGNITION COIL # 3 PRIMARY CIRCUIT —
Continued
TEST
ACTION
APPLICABILITY
8
Note: The conditions required to set the DTC are not present.
Note: Use the Freeze Frame Data to help you duplicate the conditions that
set the DTC. Pay particular attention to the DTC set conditions, such as,
VSS, MAP, ECT, and Load.
Note: Visually inspect the related wiring harness. Look for any chafed,
pierced, pinched, or partially broken wires.
Note: Visually inspect the related wire harness connectors. Look for broken,
bent, pushed out, or corroded terminals.
Note: Refer to any technical service bulletins that may apply.
Perform a wiggle test of the coil wiring while the engine is running. Listen for the
engine to miss or stall. Also watch for the Good Trip Counter to change to 0.
Were any problems found?
4.0L MPI I-6
Yes
→
Repair wiring harness/connectors as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
Test Complete.
119
DRIVEABILITY - GAS
P0353-IGNITION COIL # 3 PRIMARY CIRCUIT —
Continued
Symptom:
P0420-1/1 CATALYTIC CONVERTER EFFICIENCY
When Monitored and Set Condition:
P0420-1/1 CATALYTIC CONVERTER EFFICIENCY
When Monitored:
After engine warm up to 147 deg. F, 180 seconds of open throttle
operation, at a speed greater than 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
CATALYST EFFICIENCY DTC DOES NOT RECUR
ENGINE MECHANICAL PROBLEM
CATALYTIC CONVERTER 1/1
UPSTREAM O2 SENSOR OLDER THAN DOWNSTREAM O2 SENSOR
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read DTCs.
Is the Good Trip counter displayed and equal to zero?
All
Yes
→
No
→
2
At this time the Catalyst Efficiency Failure does not exist or is an intermittent
problem.
With the DRBIII
t, read the FREEZE FRAME data.
With this screen, 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 Catalyst Efficiency Failure Recur?
All
Yes
→
No
→
Test Complete.
3
Start Engine and let idle.
Check for exhaust leaks between the engine and the appropriate downstream O2
Sensor.
Is there any exhaust leaks?
All
Yes
→
Repair or replace leaking exhaust parts as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
120
DRIVEABILITY - GAS
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