P0206

Circuit Description

The PCM controls the fuel injector control circuit using a Multi Function Driver (MFD). The MFD has the ability to detect an electrical malfunction. If an electrical malfunction is detected, the MFD signals the PCM to set DTC P0206.

Conditions for Running the DTC

The ignition is on.

Conditions for Setting the DTC

^ An incorrect voltage level is being detected on an injector driver circuit.
^ Above condition for over 30 seconds.

Action Taken When the DTC Sets

^ The PCM will illuminate the MIL during the second consecutive trip in which the diagnostic has been run and failed.
^ If equipped with traction control, the PCM will command the Electronic Brake and Traction Control Module (EBTCM) via the serial data circuit to turn OFF traction control, and the EBTCM will illuminate the TRACTION OFF lamp.
^ The PCM will store conditions which were present when the DTC set as Freeze Frame and Fail Records data.

Conditions for Clearing the MIL/DTC

^ The PCM will turn the MIL OFF during the third consecutive trip in which the diagnostic has been run and passed.
^ The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ The DTC can be cleared by using a scan tool.

Diagnostic Aids

Check for the following conditions:

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.

^ Poor terminal connection.
Inspect the harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and faulty terminal to wire connection. Use a corresponding mating terminal to test for proper tension. Refer to Diagrams.
^ Damaged harness.
Inspect the wiring harness for damage. If the harness appears to be OK, observe the sensor display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the sensor display may indicate the location of the fault.
^ Inspect the PCM and the engine grounds for clean and secure connections.

If the DTC is determined to be intermittent, reviewing the Fail Records can be useful in determining when the DTC was last set.

Test Description

The number(s) below refer to the step number(s) on the diagnostic table:

4. If the scan tool indicates STUCK HIGH there is a short to battery positive voltage on the fuel injector driver circuit.
5. If the scan tool indicates STUCK LOW there is an open or a short to ground on the fuel injector driver circuit.
6. When the 10-way fuel injector connector is disconnected, DTCs P0107 and P1107 will be set. There DTCs should be disregarded.
If the scan tool indicates a STUCK HIGH while cranking, the short to battery positive voltage is between the 10-way connector and the PCM. If the scan tool indicates STUCK LOW while cranking the short to battery positive voltage is between the 10-way connector and the fuel injector.

Important: While cranking the engine with the 10-way fuel injector connector disconnected, all of the other injector circuits will indicate STUCK LOW, this is a fault induced by disconnecting the 10-way. They will resume correct operation when the 10-way connector is reconnected.

10. This step is checking for a short to ground in the circuit.
11. The fuel injector in this circuit will need to be checked after the short to ground is repaired or after the PCM is replaced.
12. This step is checking the function of the PCM. If the J 34142-B test light flashes then the PCM is able to supply the ground.
15. This vehicle is equipped with a PCM which utilizes an Electronically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.