For 1990-2009 cars

### Diagnostic Instructions

• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• | Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• | Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptors

DTC P0601: Control Module Read Only Memory (ROM)
DTC P0602: Control Module Not Programmed
DTC P0603: Control Module Long Term Memory Reset
DTC P0604: Control Module Random Access Memory (RAM)
DTC P0606: Control Module Internal Performance
DTC P062F: Control Module Long Term Memory Performance

### Circuit/System Description

The internal fault detection is handled inside the fuel pump flow control module (FPCM). No external circuits are involved.

### Conditions for Running the DTC

The FPCM runs the program to detect an internal fault when power up is commanded. The only requirements are voltage and ground. This program runs even if the voltage is out of the valid operating range.

### Conditions for Setting the DTC

The FPCM has detected an internal malfunction.

### Action Taken When the DTC Sets

DTC P0601, P0602, P0603, P0604, P0606 and P062F are type A DTCs.

### Conditions for Clearing the DTC

DTC P0601, P0602, P0603, P0604, P0606 and P062F are type A DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Fuel System Description

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

### Circuit/System Verification

Important: This DTC may be stored as a history DTC without affecting the operation of the module. If stored only as a history DTC and not retrieved as a current DTC, do not replace the module.

Verify that DTC P0602 is not set.

⇒ | If the DTC is set, program the FPCM.

Verify that DTCs P0601, P0603, P0604, P0606, and P062F are not set.

⇒ | If the DTCs are set, program the FPCM. If the DTCs reset, replace the FPCM.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for FPCM replacement, setup, and programming