[D4] Indicator Circuit Troubleshooting
[D4] Indicator Circuit Troubleshooting1. Turn the ignition switch ON (II), and watch the D4 indicator.
Does the [D4] indicator come on and stay on?
YES-Go to step 2.
NO-If the indicator comes on for about 2 seconds and then goes off, it's OK. If it doesn't come on at all, go to step 12.
2. Make sure the Honda PGM Tester is not connected to the data link connector.
3. Turn the ignition switch OFF.
4. Disconnect the A (32P) connector from the PCM.
5. Turn the ignition switch ON (II).
6. Measure the voltage between PCM connector terminal A14 and body ground.
Is there voltage?
YES-Repair short to power in the wire between PCM connector terminal A14 and the gauge assembly.
NO-Go to step 7.
7. Turn the ignition switch OFF.
8. Reconnect the A (32P) connector to the PCM.
9. Turn the ignition switch ON (II).
10. Shift to any position other than [D4].
11. Measure the voltage between PCM connector terminal D9 and body around.
Is there voltage?
YES-Faulty PCM or gauge assembly.
NO-Check for a short to ground in the wire between PCM connector terminal D9 and the A/T gear position switch. If the wire is OK, check the A/T gear position switch.
12. Turn the ignition switch ON (II).
13. Shift to the [D4] position.
Does the [D4] indicator come on?
YES-Check for loose terminal fit in PCM connector A14 and recheck the [D4] indicator several times. If the problem is intermittent, substitute a known good PCM and recheck. If the indicator then works OK every time, replace the original PCM.
NO-Go to step 14.
14. Turn the ignition switch OFF.
15. Disconnect the B(25P) connector from the PCM.
16. Check for continuity between body ground and PCM connector terminals B20 and B22.
Is there continuity between ground and each terminal ?
YES-Go to step 17.
NO-Repair open in the wire(s) between PCM connector terminal B20 or B22 and ground (G101), or repair poor ground (G101).
17. Turn the ignition switch ON (II).
18. Measure the voltage between PCM connector terminals B1 and B22, and between terminals B9 and B20.
Is there battery voltage?
YES-Go to step 19.
NO-Repair open or short in the wire between PCM connector terminal B1 or B9 and the PGM-FI main relay.
19. Turn the ignition switch OFF.
20. Reconnect the B(25P) connector to the PCM.
21. Connect the digital multimeter between PCM connector terminals A14 and B20 or B22.
22. Turn the ignition switch ON (II).
Is there voltage for at least two seconds?
YES-Check for an open in the wire between PCM connector terminal A14 and the gauge assembly. If the wire is OK, check for a faulty [D4] indicator bulb or a faulty printed circuit board in the gauge assembly.
NO-Go to step 23.
23. Turn the ignition switch OFF.
24. Disconnect the A (32P) connector from the PCM.
25. Check for continuity between PCM connector terminal A14 and No. 28 terminal of the gauge assembly A (30P) connector.
Is there continuity?
YES-Repair short in the wire between PCM connector terminal A14 and the gauge assembly.
NO-Check for loose terminal fit in PCM connector terminal A14. If necessary, substitute a known good PCM and recheck.