How to Troubleshoot Circuits at the PCM

How to Troubleshoot Circuits at the PCM

NOTE: The PCM stays on for up to 15 minutes after the ignition switch is turned OFF. Jumping the SCS line after turning the ignition switch OFF 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.
2. Disconnect the PCM connectors and probe the terminals from the terminal side of the connectors.
3. Check the connector terminal diameter, and select the suitable pin probe (male).
4. When diagnosis/troubleshooting is made at the PCM connector, use the inspection port (A) at the connector terminal side.





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





6. Gently slide the pin probe (male) into the inspection port. Do not slide the probe into the connector terminals.

NOTICE
^ 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 as they can damage the terminals. 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.