Pinpoint Test A: The PCM Does Not Respond To The Scan Tool

Communications Network

Pinpoint Test A: The PCM Does Not Respond To The Scan Tool

Normal Operation

The PCM communicates with the scan tool through the High Speed Controller Area Network (HS-CAN).

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- PCM

PINPOINT TEST A : THE PCM DOES NOT RESPOND TO THE SCAN TOOL

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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

A1 VERIFY WHETHER OTHER HS-CAN (High Speed Controller Area Network) MODULES PASS THE NETWORK TEST

- Enter the following diagnostic mode on the scan tool: Network Test.

- In the LH pane of the Integrated Diagnostic System (IDS) network test display screen, verify whether any HS-CAN (High Speed Controller Area Network) modules passed the network test.

Is the text "pass" or a DTC listed next to any of the following modules (if equipped): ABS module, Auxiliary Heater Control Module (AHCM), Accessory Protocol Interface Module (APIM), Body Control Module (BCM), Instrument Panel Cluster (IPC), Parking Aid Module (PAM), PCM, Restraints Control Module (RCM), Trailer Brake Control (TBC) module, Transfer Case Control Module (TCCM) or Transmission Control Module (TCM)?

Yes
If "pass" or a DTC was listed next to the PCM, a network fault is not currently present. GO to Pinpoint Test U to diagnose an intermittent HS-CAN (High Speed Controller Area Network) fault condition. Pinpoint Test U: Intermittent No High Speed Controller Area Network (HS-CAN) Communication, One Or More Modules Are Not Respond

If "pass" or a DTC was listed next to one or more modules other than the PCM, GO to A2.

No
No modules are currently communicating on the HS-CAN (High Speed Controller Area Network).GO to Pinpoint Test V to diagnose no HS-CAN (High Speed Controller Area Network) communication. Pinpoint Test V: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding

A2 VERIFY Computers and Control Systems Information PINPOINT TEST QA OR AE HAS BEEN CARRIED OUT

- Verify that pinpoint test QA (gasoline engine) or AE (diesel engine) has been carried out.

Has pinpoint test QA or AE been carried out?

Yes
GO to A3.

No
REFER to Computers and Control Systems Information, Pinpoint Tests, pinpoint test QA (gasoline engine) or AE (diesel engine) to diagnose no communication with the PCM.

A3 CHECK THE HS-CAN (High Speed Controller Area Network) TERMINATION RESISTANCE

- Ignition OFF.

- Disconnect: Negative Battery Cable.

- Measure the resistance between the Data Link Connector (DLC) C251-6, circuit VDB04 (WH/BU), harness side and the DLC (Data Link Connector) C251-14, circuit VDB05 (WH), harness side.





Is the resistance between 54 and 66 ohms?

Yes
CONNECT the negative battery cable. GO to A5.

No
GO to A4.

A4 CHECK THE CAN (Controller Area Network) CIRCUITS BETWEEN THE PCM AND THE DLC (Data Link Connector) FOR AN OPEN

- Ignition OFF.

- Disconnect: PCM C175B (Gasoline Engine) or C1232B (Diesel Engine).

- For gasoline engines, measure the resistance between the PCM C175B-59, circuit VDB04 (WH/BU), harness side and the DLC (Data Link Connector) C251-6, circuit VDB04 (WH/BU), harness side.





- For gasoline engines, measure the resistance between the PCM C175B-58, circuit VDB05 (WH), harness side and the DLC (Data Link Connector) C251-14, circuit VDB05 (WH), harness side.





- For diesel engines, measure the resistance between the PCM C1232B-59, circuit VDB04 (WH/BU), harness side and the DLC (Data Link Connector) C251-6, circuit VDB04 (WH/BU), harness side.





- For diesel engines, measure the resistance between the PCM C1232B-43, circuit VDB05 (WH), harness side and the DLC (Data Link Connector) C251-14, circuit VDB05 (WH), harness side.





Are the resistances less than 5 ohms?

Yes
CONNECT the negative battery cable. GO to A5.

No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.

A5 CHECK FOR CORRECT PCM OPERATION

- 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. CLEAR the DTCs. REPEAT the network test with the scan tool.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.