F-CAN Circuit Troubleshooting - PGM-FI System
  1. Check for continuity between ECM connector terminal A37 and body ground.
Is there continuity?
YES -
Repair short in the wire between ECM terminal A37 and the gauge control module (tach), the VSA modulator-control unit, the yaw rate-lateral acceleration sensor, the EPS control unit, the SRS unit, or the DLC.■
NO -
Go to Step 42 .
  1. Reconnect all connectors.
  1. Connect the HDS to the DLC.
  1. Disconnect the gauge control module (tach) 36P connector.
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Replace the gauge control module (tach). ■
NO -
Go to Step 46 .
  1. Turn the ignition switch OFF.
  1. Reconnect the gauge control module (tach) 36P connector.
  1. Disconnect the VSA modulator-control unit 37P connector.
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Replace the VSA modulator-control unit. ■
NO -
Go to Step 50 .
  1. Turn the ignition switch OFF.
  1. Reconnect the VSA modulator-control unit 37P connector.
  1. Disconnect the yaw rate-lateral acceleration sensor 4P connector.
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Replace the yaw rate-lateral acceleration sensor. ■
NO -
Go to Step 54 .
  1. Turn the ignition switch OFF.
  1. Reconnect the yaw rate-lateral acceleration sensor 4P connector.
  1. Disconnect EPS control unit connector D (28P).
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Replace the EPS control unit. ■
NO -
Go to Step 58 .
  1. Turn the ignition switch OFF.
  1. Reconnect EPS control unit connector D (28P).
  1. Disconnect SRS unit connector A (28P).
  1. Turn the ignition switch ON (II), and read the HDS.
Does the HDS identify the vehicle?
YES -
Replace the SRS unit. ■
NO -
Update the ECM if it does not have the latest software, or substitute a known-good ECM, then recheck. If the symptom/indication goes away with a known-good ECM, replace the original ECM. ■