For 1990-2009 cars

### Diagnostic Instructions

• | Preform 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 Descriptor

DTC P0601 00: Control Module Read Only Memory Performance
DTC P0602 00: Control Module Not Programmed
DTC P0603 00: Control Module Long Term Memory Reset
DTC P0604 00: Control Module Random Access Memory Performance
DTC P0606 00: Control Module Processor Performance
DTC P0607 00: Control Module Performance
DTC P060D 00: Control Module Accelerator Pedal Position (APP) System Performance
DTC P062F 00: Control Module Long Term Memory Performance
DTC P16F3 00: Control Module Redundant Memory Performance
DTC P2610 00: Control Module Ignition Off Timer Performance

### Circuit/System Description

This diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM) and the throttle actuator control (TAC) system. This diagnostic also addresses if the ECM is not programmed.

The ECM monitors its ability to read and write to the memory. It also monitors a timing function. The ECM and the TAC processors are used to monitor the TAC system data. Both processors monitor the other processors data to verify that the indicated APP calculation is correct. The ECM performs an intrusive test in order to confirm that the APP signals are not shorted together. The ECM accomplishes this by pulling the APP sensor 2 low momentarily and looking for sensor 1 to also be pulled low.

### Conditions for Running the DTC

#### P0601 00

• | The ignition switch is in Run or Crank.

• | The check sum calculation at power-down in the last drive cycle had completely finished.

• | DTC P0601 00 runs once per ignition cycle when the above condition is met.

#### P0602 00

• | The ignition switch is in run or crank.

• | DTC P0602 00 runs once per ignition cycle.

#### P0603 00

• | The ignition switch is in run or crank.

• | DTC P0603 00 runs once per ignition cycle.

#### P0604 00

• | The ignition switch is in run or crank.

• | The read/write test at power-down in the last drive cycle had completely finished.

• | DTC P0604 00 runs once per ignition cycle when the above condition is met.

#### P0606 00

• | The ignition switch is in the unlock, accessory, run, or crank positions.

• | The system voltage is more than 5.23 V.

• | DTC P0606 00 runs continuously when the above conditions are met.

#### P0607 00

• | The ignition switch is in the unlock, accessory, run, or crank positions.

• | The system voltage is more than 5.23 V.

• | DTCs P0601 00, P0602 00, P0603 00, P0604 00, P0606 00, P062F 00, P0641 00, P0651 00, P2610 00 are not set

• | DTC P0607 00 runs continuously when the above condition is met..

#### P060D 00

• | DTC P0606 00 is not set.

• | The ignition is in the unlock, accessory, run, or crank position.

• | The system voltage is more than 5.23 V

• | DTCs P0601D 00 runs continuously when the above conditions are met.

#### P062F 00

• | The ignition is in the unlock, accessory, run, or crank position.

• | The system voltage is more than 5.23 V

• | DTCs P062F 00 runs once per ignition cycle.

#### P16F3 00

• | DTC P0606 00 is not set.

• | The ignition is in the unlock, accessory, run, or crank position.

• | The system voltage is more than 5.23 V

• | DTCs P16F3 00 runs continuously when the above conditions are met.

#### P2610 00

• | DTCs P0112 00, P0113 00, or P0114 00 are not set.

• | The ignition is OFF.

• | The ECM is not powered down.

• | The intake air temperature (IAT) is between -40 to +80°C (-40 to +176°F).

• | DTC P2610 00 runs continuous once the above conditions are met.

### Conditions for Setting the DTC

The ECM detects an internal failure or incomplete programming for more than 10 s.

### Action Taken When the DTC Sets

• | DTCs P0601 00, and P0604 00 Type B DTCs.

• | DTC P0602 00.P0603 00, P0606 00, P0607 00, P060D 00, P062F 00, P16F3 00, and P2610 00 are Type C DTCs.

### Conditions for Clearing the DTC

• | DTCs P0601 00, and P0604 00 Type B DTCs.

• | DTC P0602 00.P0603 00, P0606 00, P0607 00, P060D 00, P062F 00, P16F3 00, and P2610 00 are Type C DTCs.

### Reference Information

#### Schematic Reference

Engine Controls Schematics

#### Connector End View Reference

Component Connector End Views

#### Electrical Information Reference

• | Circuit Testing

• | Testing for Intermittent Conditions and Poor Connections

• | Connector Repairs

• | Wiring Repairs

#### DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Testing

1. Observe the DTCs with the scan tool.

⇒ | If DTC P0602 00 is set, attempt to program the K20 Engine Control Module (ECM) before replacing the K20 Engine Control Module (ECM). Refer to Control Module References

⇒ | If DTC P0602 00 resets, replace the K20 Engine Control Module (ECM).

2. Test the K20 Engine Control Module (ECM) voltage circuits at ECM connectors terminals 12, 14, and 36 (X2), and test the ground circuit at ECM connector terminal 73 (X1) for the following:

• | A short

• | An open

• | High resistance

⇒ | If all circuits test normal, replace the K20 Engine Control Module (ECM).

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, programming and setup