Powertrain Management

DTC P0601-P0604, P0606, P062F, P16F3, or P2610 (LUW)

Diagnostic Instructions

* Preform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC P0601
- Control Module Read Only Memory Performance

DTC P0602
- Control Module Not Programmed

DTC P0603
- Control Module Long Term Memory Reset

DTC P0604
- Control Module Random Access Memory Performance

DTC P0606
- Control Module Processor Performance

DTC P062F
- Control Module Long Term Memory Performance

DTC P16F3
- Control Module Redundant Memory Performance

DTC P2610
- 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 accelerator pedal position (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
* The ignition switch is in run or crank position.
* The check sum calculation at power-down in the last drive cycle had completely finished.
* DTC P0601 runs once per ignition cycle when the above condition is met.

P0602
* The ignition switch is in run or crank position.
* DTC P0602 runs once per ignition cycle.

P0603
* The ignition switch is in run or crank position.
* DTC P0603 runs once per ignition cycle.

P0604
* The ignition switch is in run or crank position.
* The read/write test at power-down in the last drive cycle had completely finished.
* DTC P0604 runs once per ignition cycle when the above condition is met.

P0606
* The ignition switch is in run or crank position.
* The system voltage is more than 6.41 V.
* DTC P0606 runs continuously when the above conditions are met.

P062F
* The ignition is in the unlock, accessory, run, or crank position.
* DTCs P062F runs once per ignition cycle.

P16F3
* DTC P0606 is not set.
* The ignition is in the unlock, accessory, run, or crank position.
* The engine speed is between 1-2 999 RPM
* DTCs P16F3 runs continuously when the above conditions are met.

P2610
* DTCs P0111, P0112, or P0113 are not set.
* The ignition is OFF.
* The ECM is powering down.
* The intake air temperature (IAT) is between -256 to +256°C (-428.8 to +492.8°F).
* DTC P2610 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

* DTC P0601, P0602.P0603, P0604, P0606, P062F, and P16F3 are Type A DTCs.
* DTC P2610 is a Type B DTC.
* The ECM will disable engine operating or command the TAC system to operate in a reduced engine power mode.

Conditions for Clearing the DTC

* DTC P0601, P0602, P0603, P0604, P0606, P062F, and P16F3 are Type A DTCs.
* DTC P2610 is a Type B DTC.

Diagnostic Aids

* A low battery condition may cause DTC P0606, and P2610 to set.
* An intermittent condition at the ignition switch may cause DTC P2610 to set.

Reference Information
Schematic Reference

Engine Controls Schematics (LUW) [1][2]Electrical Diagrams
Connector End View Reference

Component Connector End Views Sunshade - Left (D6I)
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Testing

1. Observe the DTCs with the scan tool.

• If DTC P0602 is set, attempt to program the K20 Engine Control Module before replacing the K20 Engine Control Module. Refer to Control Module References Control Module References
• If DTC P0602 resets, replace the K20 Engine Control Module.

2. Test the K20 Engine Control Module voltage circuits at K20 Engine Control Module connector X1 terminals 3, 12, 14 and test the ground circuits at K20 Engine Control Module connector X2 terminals 73 and 16 for the following:

* A short
* An open
* High resistance

• If all circuits test normal, replace the K20 Engine Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

Control Module References Control Module References for ECM replacement, programming and setup