Thread: car randomly shutting down / DTC codes

Checked P1631 (theft deterrent password incorrect) and got the following:

This diagnostic tests for mismatched passwords between the PCM and BCM. Whenever replacing the BCM or PCMfollow the theft learn procedure in order for the system to learn the new password.

Conditions

Mismatched password metween PCM and BCM

Conditions for setting the DTC

- The PCM detects a wrong password from the BCM
- The fuel disable lockout is set
- The system has recieved an incorrect fuel continue password
- An invalid ignition key or malfunctioning ignition switch
- The BCM was replaced.

Action taken when DTC sets:

- The engine starts and then the engine stalls immediately
- The PCM stores the DTC information into the memory when the diagnostic runs and fails
- The malfunction indicator lamp will not illuminate
- The PCM records the operating conditions at the time during which the diagnostic fails. The PCM stores this information in the Failure records.

DTC P0606

Circuit Description

This diagnostic indicates that the powertrain control module (PCM) detects an internal microprocessor integrity fault.
Conditions for Running the DTC

The PCM is powered-up.
Conditions for Setting the DTC

The PCM detects an internal microprocessor integrity fault.
Action Taken When the DTC Sets

• The PCM will illuminate the malfunction indicator lamp (MIL) during the first trip in which the diagnostic test has been run and failed.
• The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.

Test Description

The number below refers to the step number on the diagnostic table.

1. This DTC indicates an internal PCM condition.

DTC U0107 sets if the battery voltage is low. If the customer's concern is slow cranking or no crank because battery voltage is low, ignore DTC U0107. Clear any DTCs from memory that may have set from the low battery voltage condition.
DTC U0107 sets when there is a short to B+ on the TAC module ground circuit. Inspect the fuses for the circuits that are in the TAC module harness-i.e. cruise, brake. An inspection of the fuses may lead you to the circuit that is shorted to the TAC module ground circuit.
DTC U0107 sets if the TAC module ignition feed circuit is shorted to a B+ supply circuit. The TAC module stays powered-up when the ignition switch is turned OFF. When the ignition switch is turned ON, the TAC module is powered-up before the PCM. DTC U0107 sets because no communication is detected by the TAC module from the PCM. Inspect related circuits for being shorted to a B+ supply circuit.
Inspect the TAC module power and ground circuits and the TAC module/PCM serial data circuits for intermittent connections.
Inspect the TAC module connectors for signs of water intrusion. If water intrusion occurs, multiple DTCs may set without any circuit or component conditions found during diagnostic testing.
When the TAC module detects a problem within the TAC system, more than one TAC system related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing an individual condition may correct more than one DTC. Remember this if you review the stored information in Capture Info.
For an intermittent condition, refer to Intermittent Conditions