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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 889 (DATA LINK COMMUNICATION SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICETEST DESCRIPTION
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Test Description

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Test Description
WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. 2. A partial malfunction in the class 2 serial data circuit uses a different procedure from a total malfunction of the class 2 serial data circuit.
  2. 3. DTCs U1300, U1301, or U1305 may be retrieved with a history status. These DTCs are not the cause of the present condition.
  3. 6. A state of health DTC with a history status may be present along with a U1000 having a current status. This indicates the malfunction occurred when the ignition was ON.
  4. 7. Data link connector terminals 2 and 5 provide the connection to the class 2 serial data circuit and the signal ground circuit respectively.
  5. 8. An open in the class 2 serial data circuit between the DLC and the modules will prevent the scan tool from communicating with any module.
  6. 9. This condition will not set a DTC. The class 2 serial data circuit is shorted to voltage or ground. The condition may be due to the wiring or due to a malfunction in one of the modules. When testing the wiring for a short, make sure there is not a module connected to the wire being tested. This test isolates the PCM class 2 serial data circuit.
  7. 10. This test isolates the PCM class 2 serial data circuit.
  8. 11. This test isolates the SDM class 2 serial data circuit.
  9. 12. This test isolates the VIU class 2 serial data circuit.
  10. 13. This test isolates the PK3 class 2 serial data circuit.
  11. 16. If there are no current DTCs that begin with a "U", the communication malfunction has been repaired.
  12. 17. The communication malfunction may have prevented diagnosis of the customer complaint.
    Fig 1: Scan Tool Does Not Communicate With Class 2 Device (1 Of 2)
    G01615959Courtesy of GENERAL MOTORS CORP.
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