How to Troubleshoot Circuits at the PCM

WARNING: This page is about a different car, the 2004 Honda Odyssey, 2003 Honda Odyssey, and 2002 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

Special Tools Required: Backprobe set 07SAZ-001000A (two required).

Pull back the carpet from passenger's side of the center lower console to expose the PCM.
Inspect the circuit on the PCM, according to the DTC troubleshooting, with the special tools and a digital multimeter.
Connect the backprobe adapters (A) to the stacking patch cords (B), and connect the cords to a multimeter (C).

Fig 1: Connecting Adapters To Properly Backprobe PCM
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Using the wire insulation as a guide for the contoured tip of the backprobe adapter, gently slide the tip into the connector from the wire side until it touches the end of the wire terminal.
If you cannot get to the wire side of the connector or the wire side is sealed, disconnect the connector and use the tester probe to probe the connectors from the terminal side. Do not force the probe into the connector.