DTC Troubleshooting: U0155 (126)
  1. Check for continuity between ECM connector terminal A37 and body ground.
Is there continuity?
YES -
Substitute a known-good gauge control module (tach), then go to Step 14 and recheck. If DTC U0155 is not indicated, replace the original gauge control module (tach), then go to Step 14 .
NO -
Repair open in the wire between the ECM (A37) and the gauge control module (tach), then go to Step 14 .
  1. Reconnect all connectors and the battery.
  1. Turn the ignition switch ON (II).
  1. Reset the ECM with the HDS.
  1. Do the ECM idle learn procedure.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0155 indicated?
YES -
Check for poor connections or loose terminals at the gauge control module (tach) and the ECM, then go to Step 1 .
NO -
Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.■