DTC P1377: Glow Time Control Circuit Open
- Check the ''On Board Diagnostic (OBD) System Check''.
Was the ''OBD System Check'' performed?
YES – Go to step 2.
NO – Go to OBD System Check. 
- Turn the ignition switch ON (II).
Is DTC P1377 indicated?
YES – Go to step 3.
NO – Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the glow relay and at the ECM.
- Check the glow relay (60A) fuses.
Are fuses OK?
YES – Go to step 4.
NO – Replace the fuse.
- Turn the ignition switch OFF.
- Disconnect the ECM connector A.
- Disconnect the glow relay connector.
- Check for an open in the glow relay circuit between the glow relay connector and the ECM connector A No. 19.
Was a problem found?
YES – Repair open in the wire between the glow relay connector and the ECM connector A terminal No. 19.
NO – Go to step 8.
- Check connection at the glow relay and replace the terminals if necessary.
Was a problem found?
YES – Replace the terminal.
NO – Go to step 9.
- Replace the glow relay.
- Connect the ECM connector A.
- Turn the ignition switch ON (II).
Is DTC P1377 indicated?
YES – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.
NO – System is OK.
| NOTICE |
The battery power supply short circuit to 5 V power supply damages the ECM.