How to Troubleshoot Circuits at the PCM Connectors

NOTE: The PCM stays on for up to an hour after the vehicle is turned to the OFF (LOCK) mode. Jumping the SCS line after turning the vehicle to the OFF (LOCK) mode cancels this function. Disconnecting the PCM during this function, without jumping the SCS line first, can damage the PCM.

1. Jump the SCS line with the HDS, and wait more than 1 minute.

2. Disconnect PCM connectors A, B, and C .

3. When diagnosis/troubleshooting are done at the PCM connectors, use the terminal test port (A) above the terminal you need to check.

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4. Connect one side of the patch cord terminals (A) to a commercially available digital multimeter (B), and connect the other side of the terminals (C) to a commercially available banana jack (Pomona Electronics Tool No. 3563 or equivalent) (D).

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5. Gently contact the pin probe (male) at the terminal test port from the terminal side. Do not force the tips into the terminals.

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For accurate results, always use the pin probe (male).
To prevent damage to the connector terminals, do not insert test equipment probes, paper clips, or other substitutes. Damaged terminals cause a poor connection and an incorrect measurement.
Do not puncture the insulation on a wire. Punctures can cause poor or intermittent electrical connections.