Dodge Dakota (R1). Manual — part 850
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
→
132
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
4
Check the exhaust for excessive smoke from internal oil or coolant leaks.
Is there an oil or coolant consumption condition present?
All
Yes
→
Repair engine mechanical condition as necessary and replace
Catalytic Converter.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
5
NOTE: 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
Yes
→
Replace the appropriate Upstream Oxygen Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→
6
If there are no possible causes remaining, view repair.
All
Repair
Replace the Catalytic Converter.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
133
DRIVEABILITY - GAS
P0420-1/1 CATALYTIC CONVERTER EFFICIENCY —
Continued
Symptom:
P0463-FUEL LEVEL SENDING UNIT VOLTS TOO HIGH
When Monitored and Set Condition:
P0463-FUEL LEVEL SENDING UNIT VOLTS TOO HIGH
When Monitored:
Ignition on and battery voltage above 10.4 volts.
Set Condition:
The fuel level sensor signal voltage at the PCM goes above 9.9 volts for
more than 90 seconds.
POSSIBLE CAUSES
FUEL LEVEL SENSOR SIGNAL CIRCUIT OPEN
FUEL PUMP MODULE WIRING HARNESS INTERMITTENT
SENSOR GROUND CIRCUIT OPEN
FUEL LEVEL SENSOR
POWERTRAIN CONTROL MODULE
FUEL LEVEL SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
TEST
ACTION
APPLICABILITY
1
Turn the ignition on.
With the DRBIII
t, read the fuel level sensor voltage.
Is the fuel level sensor voltage above 9.9 volts?
All
Yes
→
No
→
2
Turn the ignition off.
Disconnect the Fuel Pump Module electrical harness connector.
Connect a jumper wire between the Fuel Level Sensor signal circuit and the Sensor
Ground circuit at the Fuel Pump Module harness connector.
Turn the ignition on.
With the DRBIII
t, read the Fuel Level Sensor voltage.
Did the Fuel Level Sensor voltage change from above 9.0 volts to below 0.4 volts?
All
Yes
→
Replace the fuel level sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
134
DRIVEABILITY - GAS
TEST
ACTION
APPLICABILITY
3
Turn the ignition off.
Disconnect the Fuel Pump Module electrical harness connector.
Connect a jumper wire between the Fuel Level Sensor signal circuit and the Sensor
Ground circuit at the Fuel Pump Module harness connector.
Turn the ignition on.
With the DRBIII
t, read the Fuel Level Sensor voltage.
Did the Fuel Level Sensor voltage change from above 9.0 volts to below 0.4 volts?
All
Yes
→
Replace the fuel level sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
4
Note: Visually inspect the wiring harness leading to the fuel pump module.
Look for any parts of the wiring harness that may be pinched or rubbed
through.
Turn the ignition on.
With the DRBIII
t, monitor the fuel level sensor voltage.
Using the schematic, wiggle the Fuel Pump Module Connector & Harness.
Was there any fuel level sensor voltage change, during the wiggle test?
All
Yes
→
Repair the wiring harness as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
5
Turn the ignition off.
Disconnect the Fuel Pump Module harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the sensor ground circuit from the PCM connector to the Fuel Pump Module
connector.
Is the resistance below 5.0 ohms?
All
Yes
→
No
→
Repair the open sensor ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
6
Turn the ignition off.
Disconnect the Fuel Pump Module harness connector.
Disconnect the PCM harness connector(s).
Note: Check connectors - Clean/repair as necessary.
Measure the resistance between the Fuel Level Sensor Signal Circuit and the Sensor
Ground Circuit.
Is the resistance below 5.0 ohms?
All
Yes
→
Repair the fuel level sensor signal circuit shorted to the sensor
ground circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 2.
No
→
135
DRIVEABILITY - GAS
P0463-FUEL LEVEL SENDING UNIT VOLTS TOO HIGH —
Continued
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