Refer to
Cell 20: Fuel Control (VIN K)
or
Cell 20: Fuel Control (VIN 1)
for wiring diagrams.
Circuit Description
The PCM provides ignition positive voltage to control the fuel pump relay. The PCM has the ability to detect an electrical malfunction on the relay control circuit. When the ignition switch is first turned ON, the PCM energizes the fuel pump relay which applies power to the fuel pump. The fuel pump relay will remain ON as long as the engine is running or cranking and the PCM is receiving reference pulses. If no reference pulses are present, the PCM de-energizes the fuel pump relay within 2 seconds after the ignition is turned ON or the engine is stopped. With the engine stopped, the fuel pump can be turned ON by using the scan tool output controls function. If an electrical malfunction is detected, the PCM will set DTC P0230.
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
| • | The PCM detects an electrical malfunction on the fuel pump relay control circuit. |
| • | The condition is present for 0.5 second. |
Diagnostic Aids
An intermittent may be caused by a poor connection, rubbed through the wire insulation or a wire broken inside of the insulation.
Check for the following conditions:
| • | Poor connections at the PCM or fuel pump relay. |
| Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. |
| • | Damaged harness |
| Inspect the wiring harness for damage. |
Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may help determine how often the condition that caused the DTC to be set occurs. This may assist in diagnosing the condition.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
Ensures that the fuel pump relay control circuit and the PCM are not shorted to voltage.
-
This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed. Refer to Powertrain Control Module Replacement/Programming .
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||
Is the test lamp on more than 2 seconds? | -- | |||
3 |
Was a problem found? | -- | ||
4 |
Does the test lamp turn on when the fuel pump is commanded ON? | -- | ||
5 |
Was a problem found? | -- | ||
6 | Probe the fuel pump relay ground circuit with a test lamp connected to B+. Is the test lamp ON? | -- | ||
7 | Check for a poor terminal connection at the PCM and replace terminals if necessary. Refer to Repairing Connector Terminals in Wiring Systems. Was a Problem Found? | -- | ||
8 | Check for a poor terminal connection at the fuel pump relay and replace terminals if necessary. Refer to Repairing Connector Terminals in Wiring Systems. Was a problem found? | -- | ||
9 | Locate and repair short to voltage in the fuel pump relay control circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
10 | Locate and repair open in the fuel pump relay ground circuit. Refer to Wiring Repairs in Wiring Systems. Is action complete? | -- | -- | |
11 | Replace the fuel pump relay. Refer to Fuel Pump Relay Replacement . Is action complete? | -- | -- | |
|
Important: : The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is action complete? | -- | -- | ||
13 |
Does the scan tool indicate DTC P0230 failed this ignition? | -- | System OK |
