Initial Inspection and Diagnostic Overview

How to Troubleshoot Circuits at the PCM

NOTE: The PCM overwrites data and monitors the EVAP system 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) and/or flat spade probe (male).







4. 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).

NOTE: When diagnosis/troubleshooting is necessary at the PCM connector, use the measurement hole (A) at the connector terminal side.

5. Gently slide the pin probe (male) and/or flat spade probe (male). Into the connector terminals from the terminal side. Do not force the tips into the terminals.

NOTE
- For accurate results, always use the pin probe (male), and/or flat spade probe (male).
- To prevent damage to the connector terminals, do not insert the 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.