Pinpoint Test AE: No Power To The Scan Tool

Communications Network

Pinpoint Test AE: No Power To The Scan Tool

Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number

Normal Operation

The scan tool is connected to the Data Link Connector (DLC) to communicate with modules on the High Speed Controller Area Network (HS-CAN) and the Medium Speed Controller Area Network (MS-CAN).

A loss of ground or poor ground at the DLC (Data Link Connector) may result in HS-CAN (High Speed Controller Area Network) or MS-CAN (Medium Speed Controller Area Network) faults while the scan tool is connected.

This pinpoint test is intended to diagnose the following:

- Fuse

- Wiring, terminals or connectors

- DLC (Data Link Connector)

- Scan tool

PINPOINT TEST AE : NO POWER TO THE SCAN TOOL

NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the Pinpoint Test. Communications Network

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings.

AE1 CHECK DLC (Data Link Connector) PINS FOR DAMAGE

- Disconnect the scan tool cable from the DLC (Data Link Connector).

- Inspect DLC (Data Link Connector) pins 4, 5 and 16 for damage.





Are DLC (Data Link Connector) pins 4, 5 and 16 OK?

Yes
GO to AE2.

No
REPAIR the DLC (Data Link Connector) as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.

AE2 CHECK THE VOLTAGE SUPPLY CIRCUIT TO THE DLC (Data Link Connector)

- Measure the voltage between the DLC (Data Link Connector) C251-16, circuit SBP20 (VT/RD) or (GN/RD), harness side and ground.





Is the voltage greater than 10 volts?

Yes
GO to AE3.

No
VERIFY the Smart Junction Box (SJB) fuse 20 (15A) is OK. If OK, REPAIR the circuit. If not OK, Refer to the Wiring Diagrams to identify the possible causes of the circuit short. REPEAT the network test with the scan tool. Diagrams By Number

AE3 CHECK THE DLC (Data Link Connector) GROUND CIRCUITS FOR AN OPEN

- Ignition OFF.

- Disconnect: Negative Battery Cable.

- Measure the resistance between the DLC (Data Link Connector) C251-4, circuit GD116 (BK/VT) and C251-5, circuit GD114 (BK/BU), harness side and ground.





Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. REPAIR the scan tool. REPEAT the network test with the scan tool.

No
REPAIR the circuit in question. CONNECT the negative battery cable. REPEAT the network test with the scan tool.