Refer to Engine Controls Schematics
Fuel Tank Input/Output (L67 Only)
.
Circuit Description
Output driver modules (ODMs) are used by the powertrain control module (PCM) to turn ON many of the current-driven devices that are needed to control various engine and transaxle functions. Each ODM is capable of controlling up to 7 separate outputs by applying ground to the device which the PCM is commanding ON. Unlike the quad driver modules (QDMs) used in prior model years, ODMs have the capability of diagnosing each output circuit individually. If an improper voltage level has been detected on the output circuit which controls the Fuel Pump Speed Control relay, DTC P1260 will set.
Conditions for Setting the DTC
| • | The ignition is ON. |
| • | An improper voltage level has been detected on the output circuit which controls the Fuel Pump Speed Control relay. |
| • | The above conditions are present for at least 30 seconds. |
Action Taken When the DTC Sets
The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.
Conditions for Clearing the MIL/DTC
| • | The DTC becomes history when the conditions for setting the DTC are no longer present. |
| • | The history DTC clears after 40 malfunction free warm-up cycles. |
| • | The PCM receives a clear code command from the scan tool. |
Diagnostic Aids
Inspect for the following conditions:
Many situations may lead to an intermittent condition. Perform each inspection or test as directed.
Important: : Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing or replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
| • | Loose terminal connection |
| - | Use a corresponding mating terminal to test for proper tension. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| - | Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Refer to Testing for Intermittent Conditions and Poor Connections , and to Connector Repairs in Wiring Systems for diagnosis and repair. |
| • | Damaged harness--Inspect the wiring harness for damage. If the harness inspection does not reveal a problem, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the scan tool display may indicate the location of the fault. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
| • | Inspect the powertrain control module (PCM) and the engine grounds for clean and secure connections. Refer to Wiring Repairs in Wiring Systems for diagnosis and repair. |
If the condition is determined to be intermittent, reviewing the Snapshot or Freeze Frame/Failure Records may be useful in determining when the DTC or condition was identified.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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Normally ignition feed voltage is present on the output driver circuit with the PCM disconnected and the ignition ON, with the engine OFF.
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This step tests for a shorted component or a short to B+ on the output driver circuit. Either condition would result in a measured current of over 0.5 amps.
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This step tests for a faulty Fuel Pump Speed Control relay.
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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.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On Board Diagnostic System Check? | -- | ||
|
Important: If the vehicle cranks but will not run, refer to Engine Cranks but Does Not Run .
Does the voltage measure near the specified value? | B+ | |||
Does the current remain within the specified values? | 0.5-1.5 A | |||
Does the current measure less than the specified value? | 0.5 A | |||
5 | Locate and repair short to voltage in the Fuel Pump Speed Control driver circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
6 |
Does the test lamp illuminate? | -- | ||
7 | Locate and repair open in the Fuel Pump Speed Control driver circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
8 | Locate and repair short to ground in the Fuel Pump Speed Control driver circuit. Refer to Wiring Repairs in Wiring Systems. Is the action complete? | -- | -- | |
9 |
Did you find and correct the condition? | -- | ||
10 | Replace the Fuel Pump Speed Control relay. Is the action complete? | -- | -- | |
|
Important: The replacement PCM must be programmed. Replace the PCM. Refer to Powertrain Control Module Replacement/Programming . Is the action complete? | -- | -- | ||
12 |
Does the DTC reset? | -- | System OK |
