Pinpoint Test G: DTC U1900 OR DTC U2511
Anti-Theft
Pinpoint Tests
Pinpoint Test G: DTC U1900 OR DTC U2511
Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number
Normal Operation
The Passive Anti-Theft System (PATS) uses a visual anti-theft indicator located in the Instrument Cluster (IC). This indicator proves out for 3 seconds when the key is turned to the ON or START position under normal operation. If there is a PATS concern, this indicator either flashes rapidly or glows steadily (for more than 3 seconds) when the key is turned to the ON or START position. PATS 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.
If DTC U2510 is present, refer to DTC Charts. Diagnostic Trouble Code Tests and Associated Procedures
- DTC U1900 (CAN Communication Bus Fault - Receive Error) - sets in continuous memory only when the IC loses communication with the PCM. The fault may not be present at the time of testing. This DTC may be caused by a High Speed Controller Area Network (HS-CAN) circuit issue or by the IC or the PCM.
- DTC U2511 (CAN - Data Mis-Match [Receive Data Does Not Match Expected]) - sets in continuous memory only when the IC does not receive the expected response from the PCM over the HS-CAN. The fault may not be present at the time of testing. The data sent by the PCM does not match the data expected by the IC and this DTC is set. This DTC can be caused by the HS-CAN circuits between the IC and the PCM, by either module, or if the battery voltage is low.
This pinpoint test is intended to diagnose the following:
- Low battery state of charge
- Wiring, terminals or connectors
- IC
- PCM
PINPOINT TEST G: DTC U1900 OR U2511
NOTE: When a new IC is installed, the PATS keys must be programmed into the new IC.
NOTE: When a new IC is installed, the parameters must be reset in the IC and the PCM.
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G1 CHECK THE BATTERY STATE OF CHARGE
- Ignition OFF.
- Check the battery state of charge with the battery condition test. Refer to Battery.
- Does the battery pass the battery condition test?
Yes
GO to G2.
No
REFER to Charging System to diagnose the low battery voltage condition.
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G2 CHECK FOR MODULE COMMUNICATION ON THE HS-CAN
- Connect the scan tool.
- Ignition ON.
- Carry out the network test using the scan tool.
- Is the scan tool unable to communicate with any of the modules on the HS-CAN?
Yes
REFER to Information Bus to diagnose the module that is not communicating with the scan tool.
No
GO to G3.
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G3 INSPECT THE HS-CAN CIRCUITRY
- Ignition OFF.
- Inspect all of the HS-CAN circuitry, including the pin crimps, connector fit, corroded/bent/pushed-out/damaged pins and splice integrity between the PCM and the IC.
- Does the HS-CAN circuitry pass the component inspection?
Yes
GO to G4.
No
REPAIR the HS-CAN circuitry as necessary. CLEAR the DTCs. CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation.
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G4 CHECK FOR CORRECT PCM OPERATION
NOTE: When a new PCM is installed, the PATS keys do not need to be programmed into the IC.
NOTE: When a new PCM is installed, the parameters must be reset in the IC and the PCM.
- Disconnect all the PCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the PCM 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 PCM. REFER to Computers and Control Systems. RESET the parameters in both the IC and the PCM. REFER to Passive Anti-Theft System (PATS) Parameter Reset Passive Anti-Theft System (PATS). CYCLE the ignition. REPEAT the self-test. TEST the system for normal operation. If the concern is still present, GO to G5.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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G5 CHECK FOR CORRECT IC OPERATION
NOTE: When a new IC is installed, the PATS keys must be programmed into the new IC.
NOTE: When a new IC is installed, the parameters must be reset in the IC and the PCM.
- Disconnect the IC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IC 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. REFER to Instrument Panel, Gauges and Warning Indicators. RESET the parameters in both the IC and the PCM. REFER to Passive Anti-Theft System (PATS) Parameter Reset Passive Anti-Theft System (PATS). PROGRAM the PATS keys into the new IC. REFER to Key Programming Using Diagnostic Equipment 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.
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