DTC 44-1
DTC 44-1: VTM-4 RelayNOTE: Before you troubleshoot, review the general troubleshooting information.
1. Turn the ignition switch ON (II).
2. Clear the DTC.
3. Test-drive the vehicle, and check for DTCs with the HDS.
Is DTC 44-1 indicated?
YES - Go to step 4.
NO - Intermittent failure, the system is OK at this time.
4. Measure voltage between the No. 4 terminal of the VTM-4 control unit connector A (22P) and body ground, and between the No. 7 terminal of the VTM-4 control unit connector B (12P) and body ground with the ignition switch ON (II), and with the engine started.
Is the voltage correct?
YES - Go to step 16.
NO - Go to step 5.
5. Turn the ignition switch OFF.
6. Remove the VTM-4 relay, and test it.
Is the VTM-4 relay OK?
YES - Go to step 7.
NO - Replace the VTM-4 relay.
7. Turn the ignition switch ON (II) with the VTM-4 relay removed.
8. Measure voltage between the No. 1 and No. 5 terminals of the VTM-4 relay 5P connector and body ground.
Is there battery voltage?
YES - Go to step 9.
NO - Check for blown No. 4 (20 A) fuse in the auxiliary fuse box or No. 18 (15 A) fuse in the driver's under-dash fuse/relay box. If the fuses are OK, repair open in the wire between the auxiliary fuse box or the driver's under-dash fuse/relay box and the VTM-4 relay.
9. Turn the ignition switch OFF.
10. Disconnect the VTM-4 control unit connector A (22P) and connector B (12P).
11. Turn the ignition switch ON (II).
12. Measure voltage between the No. 4 terminal of the VTM-4 control unit connector A (22P) and body ground, and between the No..7 terminal of the VTM-4 control unit connector B (12P) and body ground.
Is there battery voltage?
YES - Repair short to power in the wire between the VTM-4 control unit (A4 or B7) and the VTM-4 relay.
NO - Go to step 12.
13. Turn the ignition switch OFF.
14. Check for continuity between the No. 4 terminal of the VTM-4 control unit connector A (22P) and body ground, and between the No. 7 terminal of the VTM-4 control unit connector B (12P) and body ground.
Is there continuity?
YES - Repair short to ground in the wire between the VTM-4 control unit (A4 or B7) and the VTM-4 relay.
NO - Go to step 15.
15. Check for continuity between the No. 4 terminal of the VTM-4 control unit connector A (22P) and the No. 3 terminal of the VTM-4 relay, and between the No. 7 terminal of the VTM-4 control unit connector B (12P) and the No. 2 terminal of the VTM-4 relay.
Is there continuity?
YES - Go to step 16.
NO - Repair open in the wire between the A4 or B7 terminals of the VTM-4 control unit and the VTM-4 relay.
16. Check for poor connections or loose terminals at the VTM-4 control unit and the VTM-4 relay connectors. If the connections are OK, go to step 17
17. Test-drive the vehicle, and check for DTCs with the HDS.
Is DTC 44-1 indicated?
YES - Replace the VTM-4 control unit.
NO - The system is OK at this time.