D Indicator Circuit Troubleshooting
D Indicator Light Circuit Troubleshooting1. Turn the ignition switch ON (II), and watch the [D] indicator light.
Does the [D] indicator light come on and stay on ?
YES-Go to step 2.
NO-If the light comes on for about two seconds and then goes off, it's OK. If it does not come on at all, go to step 12.
2. Make sure the Honda PGM Tester is not connected to the DLC.
3. Turn the ignition switch OFF.
4. Disconnect TCM connector A (26P).
5. Turn the ignition switch ON (II).
6. Measure the voltage between TCM connector terminal A20 and body ground.
Is there voltage?
YES-Repair short to power in the wire between TCM connector terminal A20 and the gauge assembly.
NO-Go to step 7.
7. Turn the ignition switch OFF.
8. Reconnect TCM connector A (26P).
9. Turn the ignition switch ON (II).
10. Shift to any position other than D.
11. Measure the voltage between TCM connector terminal A9 and body ground.
Is there voltage?
YES-Faulty TCM or the gauge assembly.
NO-Check for short to ground in the wire between TCM connector terminal AS and the transmission range switch. If the wire is OK, check the transmission range switch.
12. Shift to the [D] position, and watch the [D] indicator light.
Does the D indicator light come on?
YES-Check for loose terminal fit in the TCM connectors, and recheck the [D] indicator light several times. If the problem is intermittent, substitute a known-good TCM and recheck. If the light then works OK every time, replace the original TCM.
NO-Go to step 13.
13. Turn the ignition switch OFF.
14. Disconnect TCM connector A (26P).
15. Check for continuity between TCM connector terminal A4 and body ground, and between terminal A17 and body ground.
Is there continuity between each terminal and ground ?
YES-Go to step 16.
NO-Repair open in the wire(s) between TCM connector terminal A4 orA17 and ground (G101), or repair poor ground (G101).
16. Turn the ignition switch ON (II).
17. Measure the voltage between TCM connector terminals A4 and A12, and between terminals A17 and A25.
Is there battery voltage?
YES-Go to step 18.
NO-Repair open or short in the wire between TCM connector terminals A12 or A25 and the under-dash fuse/relay box.
18. Turn the ignition switch OFF.
19. Reconnect TCM connector A (26P).
20. Connect the multimeter between TCM connector terminals A20 and A4 or A17.
21. Turn the ignition switch ON (II), and check for the voltage.
Is there voltage for at least two seconds?
YES-Check for an open in the wire between TCM connector terminal A20 and the gauge assembly. If the wire is OK, check for a faulty [D] indicator light bulb or a faulty printed circuit board in the gauge assembly.
NO-Go to step 22.
22. Turn the ignition switch OFF.
23. Disconnect TCM connector A (26P).
24. Check for continuity between TCM connector terminal A20 and gauge assembly connector terminal C10.
Is there continuity?
YES-Check for loose terminal fit in the TCM connectors. Check the transmission range switch. If necessary, substitute a known-good TCM and recheck.
NO-Repair open in the wire between TCM connector terminal A20 and gauge assembly.