Pinpoint Test I: DTC U0100, U0101, U2511
Anti-Theft
Pinpoint Test I: DTC U0100, U0101, U2511
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information Electrical Diagrams.
Normal Operation
The Passive Anti-Theft System (PATS) uses a visual anti-theft indicator located in the Instrument Cluster (IC). This anti-theft indicator proves out for 3 seconds when the key is turned to the ON or START position under normal operation. Retrieve DTCs from the IC (Instrument Cluster) and the Transmission Control Module (TCM) to determine if there are any PATS (Passive Anti-Theft System) -related DTCs that can indicate the cause of the no-start.
Once the PATS (Passive Anti-Theft System) key read matches with one of the key codes programmed into the IC (Instrument Cluster), the IC (Instrument Cluster) sends its ID over the High Speed Controller Area Network (HS-CAN) to the TCM (Transmission Control Module). The TCM (Transmission Control Module) sends a message back, indicating it has received the IC (Instrument Cluster) message (ID) and also sends its ID back to the IC (Instrument Cluster). When the IC (Instrument Cluster) receives this data transfer, it requests the TCM (Transmission Control Module) to start the vehicle by sending a message over the HS-CAN (High Speed Controller Area Network) to the TCM (Transmission Control Module). This "handshake" is necessary before the vehicle starts.
If there is a PATS (Passive Anti-Theft System) concern, the indicator either flashes rapidly or glows steadily (for more than 3 seconds) when the key is turned to the ON or START position. PATS (Passive Anti-Theft System) also flashes the anti-theft indicator every 2 seconds at key off to act as a visual theft deterrent. The anti-theft indicator operation is controlled by the IC (Instrument Cluster).
If DTC U2510 is present, refer to DTC Charts Antitheft and Alarm Systems.
- DTC U0100 (Lost Communication With ECM (Engine Control Module) /PCM)- sets in continuous memory only when the IC (Instrument Cluster) loses communication with the PCM. The fault may not be present at the time of testing and only occurs during the PATS (Passive Anti-Theft System) ID code reads. This DTC can be caused by an HS-CAN (High Speed Controller Area Network) circuit concern or by the IC (Instrument Cluster) or the PCM.
- DTC U0101 (Lost Communication With TCM (Transmission Control Module))- sets in continuous memory only when the IC (Instrument Cluster) loses communication with the TCM (Transmission Control Module). The fault may not be present at the time of testing and only occurs during the PATS (Passive Anti-Theft System) ID code reads. This DTC can be caused by an HS-CAN (High Speed Controller Area Network) circuit concern or by the IC (Instrument Cluster) or the TCM (Transmission Control Module).
- DTC U2511 (CAN (Controller Area Network) - Data Mis-Match [Receive Data Does Not Match Expected])- sets in continuous memory only when the IC (Instrument Cluster) does not receive the expected response from the TCM (Transmission Control Module) over the HS-CAN (High Speed Controller Area Network) and the fault may not be present at the time of testing. The data sent by the TCM (Transmission Control Module) does not match the data expected by the IC (Instrument Cluster) and this DTC is set. This DTC can be caused by the HS-CAN (High Speed Controller Area Network) circuits between the IC (Instrument Cluster) and the TCM (Transmission Control Module) or by either module. This DTC can also be set if the battery voltage is low.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Low battery state of charge
- IC (Instrument Cluster)
- TCM (Transmission Control Module)
PINPOINT TEST I : DTC U0100, U0101, U2511
I1 CHECK THE BATTERY STATE OF CHARGE
- Ignition OFF.
- Check the battery state of charge with the battery condition test.
Does the battery pass the battery condition test?
Yes
GO to I2.
No
REFER to Charging System to diagnose the low battery voltage condition.
I2 CHECK FOR MODULE COMMUNICATION ON THE HS-CAN (High Speed Controller Area Network)
- Connect the scan tool.
- Ignition ON.
- Carry out the network test using the scan tool.
Is the scan tool able to communicate with all of the modules on the HS-CAN (High Speed Controller Area Network) ?
Yes
The fault is not currently present, GO to I3.
No
REFER to Information Bus to diagnose the module that is not communicating with the scan tool.
I3 INSPECT THE HS-CAN (High Speed Controller Area Network) CIRCUITRY
- Ignition OFF.
- Inspect all of the HS-CAN (High Speed Controller Area Network) for a faulty or intermittent connection, including the pin crimps, connector fit, corroded/bent/pushed-out/damaged pins and splice integrity in the splices and connections (connectors) between the TCM (Transmission Control Module) and the IC (Instrument Cluster).
Does the HS-CAN (High Speed Controller Area Network) circuitry pass the component inspection?
Yes
GO to I4.
No
REPAIR the HS-CAN (High Speed Controller Area Network) circuitry as necessary. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.
I4 CHECK FOR CORRECT TCM (Transmission Control Module) OPERATION
NOTE: When a new TCM (Transmission Control Module) is installed, the PATS (Passive Anti-Theft System) keys do not need to be programmed into the IC (Instrument Cluster).
- Disconnect all the TCM (Transmission Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the TCM (Transmission Control Module) connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new TCM (Transmission Control Module). RESET the parameters in both the IC (Instrument Cluster) and the TCM (Transmission Control Module). REFER to Passive Anti-Theft System (PATS) Parameter Reset . CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation. If the concern is still present, GO to I5.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
I5 CHECK FOR CORRECT IC (Instrument Cluster) OPERATION
- Disconnect the IC (Instrument Cluster) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC (Instrument Cluster) connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new IC (Instrument Cluster). RESET the parameters in both the IC (Instrument Cluster) and the TCM (Transmission Control Module). REFER to Passive Anti-Theft System (PATS) Parameter Reset . PROGRAM the PATS keys into the new IC (Instrument Cluster). REFER to Spare Key Programming - Using Diagnostic Equipment . CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.