DTC P0230 Fuel Pump Relay Control
Circuit
When you turn the
ignition switch to the ON position, the PCM activates the in-tank fuel pump.
The fuel pump remains on as long as the PCM receives reference pulses from the
electronic ignition system. If there are no reference pulses, the PCM turns the
fuel pump off after about 2-3 seconds. The PCM controls the fuel pump relay by
applying B+ to the control circuit via an internal switch called a driver. The
primary function of the driver is to supply a voltage to the fuel pump relay.
The driver has a fault line which the PCM monitors. When the PCM commands the
fuel pump on, the voltage of the control circuit should be high (near battery
voltage). When the PCM commands the control circuit to the fuel pump OFF, the
voltage potential of the circuit should be low (near 0 volts). This DTC sets
when the PCM detects the fuel pump control circuit is shorted to ground.
Conditions
for Running the DTC
- The engine speed is greater than 600
RPM.
- The ignition voltage is between 6.0
volts and 16.0 volts.
Conditions
for Setting the DTC
- The PCM detects that the commanded
state of the driver and the actual state of the control circuit do not
match.
- All the above conditions present for
a minimum of 10 seconds.
Action
Taken When the DTC Sets
- The PCM illuminates the malfunction
indicator lamp (MIL) on the second consecutive ignition cycle that the
diagnostic runs and fails.
- The PCM records the operating conditions
at the time the diagnostic fails. The first time the diagnostic fails, the
PCM stores this information in the Failure Records. If the diagnostic
reports a failure on the second consecutive ignition cycle, the PCM
records the operating conditions at the time of the failure. The PCM
writes the conditions to the Freeze Frame and updates the Failure Records.
Conditions
for Clearing the MIL/DTC
- A last test failed, or the current
DTC, clears when the diagnostic runs and does not fail.
- A history DTC clears after
40 consecutive warm-up cycles, if failures are not reported by this
or any other emission related diagnostic.
- Use a scan tool in order to clear
the MIL/DTC.
Important
- Remove any debris from the PCM connector surfaces
before servicing the PCM. Inspect the PCM connector gaskets when
diagnosing/replacing the PCM. Ensure that the gaskets are installed
correctly. The gaskets prevent contaminate intrusion into the PCM.
- For any test that requires probing the PCM or a
component harness connector, use the Connector Test Adapter Kit J 35616-A .
Using this kit prevents damage to the harness connector terminals.
- The following may cause an
intermittent:
- Poor connections: Test for adequate
terminal tension. Refer to Intermittents and Poor Connections Diagnosis in
Wiring Systems.
- Corrosion
- Mis-routed harness
- Rubbed through wire insulation
- Broken wire inside the insulation
- Using the Freeze Frame and/or
Failure Records data may aid in locating an intermittent condition. If you
cannot duplicate the DTC, the information included in the Freeze Frame
and/or Failure Records data can help determine how many miles since the
DTC set. The Fail Counter and Pass Counter can also help determine how
many ignition cycles the diagnostic reported a pass and/or a fail. Operate
the vehicle within the same freeze frame conditions (RPM, load, vehicle
speed, temperature etc.) that you observed. This will isolate when the DTC
failed.
- For an intermittent condition, refer
to Symptoms
.
The numbers below refer
to the step numbers on the diagnostic table.
|
Step |
Action |
Value(s) |
Yes |
No |
|
Did
you perform the Powertrain On-Board Diagnostic
(OBD) System Check? |
-- |
|||
Does
the fuel pump relay turn ON and OFF when commanded? |
-- |
|||
Important Replace
the relay if the DMM goes to 0 Amps during the current draw test.
Does
the current draw measure less than the specified value shown (but not 0)? |
0.75A |
Go to Diagnostic Aids |
||
|
Important For underhood
relay terminal identification refer to Electrical
Center Identification Views in Wiring Systems.
Does
the DMM display infinite resistance? |
-- |
|||
|
Important For underhood
relay terminal identification refer to Electrical
Center Identification Views in Wiring Systems.
Does
the test lamp turn ON and OFF when commanded? |
-- |
|||
|
Test
the resistance of the fuel pump relay ground circuit at the underhood electrical center to the battery ground using
the DMM J 39200
. Refer to Testing
for Continuity in Wiring Systems. Is the resistance within the specified
range? |
0-5ohms |
|||
Does
the relay turn ON when the circuit is grounded and OFF when the circuit is
opened? |
-- |
|||
|
Inspect
the connections at the relay. Refer to Intermittents and Poor Connections Diagnosis in
Wiring Systems. If you find a poor connection, repair the condition as
necessary. Refer to Repairing
Connector Terminals in Wiring Systems. Did you find and correct the
condition? |
-- |
|||
|
Repair
the open fuel pump relay ground circuit. Refer to Wiring
Repairs in Wiring Systems. Is the action complete? |
-- |
-- |
||
|
Repair
the fuel pump relay control circuit. Refer to Wiring
Repairs in Wiring Systems. Is the action complete? |
-- |
-- |
||
|
Replace
the relay. Refer to Fuel
Pump Relay Replacement . Is the action complete? |
-- |
-- |
||
|
Important: Program the replacement
PCM. Refer to PCM
Replacement/Programming . Replace
the PCM. Is the action complete? |
-- |
-- |
||
Does
the scan tool indicate that this test passed? |
-- |
|||
|
Select
the Capture Info option and the Review Info option using the scan tool. Are
any DTCs displayed that you have not diagnosed? |
-- |
Go to the applicable
DTC table |
System OK |