A/T Gear Position Indicator Circuit Troubleshooting

A/T Gear Position Indicator Circuit Troubleshooting
SRS components are located in this area. Review the SRS component locations, and the precautions and procedures before performing repairs or service.
1. Turn the ignition switch ON (II), and watch the A/T TEMP indicator.
Does the A/T TEMP indicator come on for about 2 seconds, then stay on?
YES - If the indicator comes on for about 2 seconds, goes out for 0.5 second, then comes back on, ATF temperature is high. Cool the ATF temperature down, and recheck the indicator. If the indicator remains on, go to step 2.
NO - If the indicator comes on for about 2 seconds and then goes off, it's normal. If it doesn't come on at all, go to step 6.
2. Turn the ignition switch OFF.
3. Jump the SCS line with the HDS.
4. Disconnect PCM connector B (56P), and disconnect the HDS from the DLC.
5. Turn the ignition switch ON (II), and watch the A/T TEMP indicator.
Does the indicator remain on?
YES - Repair short to ground in the wire between PCM connector terminal B4 and the gauge assembly. If the wire is OK, check for a faulty circuit board in the gauge assembly.
NO - Substitute a known-good PCM, and recheck.
6. Turn the ignition switch OFF.
7. Jump the SCS line with the HDS.
8. Disconnect PCM connector A (73P), and disconnect the PGM Tester or HDS from the DLC.
9. Disconnect gauge assembly connector A (30P).





10. Check for continuity between PCM connector terminal B4 and gauge assembly connector terminal A24.
Is there continuity ?
YES - Go to step 11.
NO - Repair open in the wire between PCM connector terminal B4 and the gauge assembly.





11. Check for continuity between PCM connector terminals A39 and body ground, between A40 and body ground, and between A73 and body ground.
Is there continuity ?
YES - Go to step 12.
NO - Repair open in the wires between PCM connector terminals A39, A40, A73 and ground (G101, G102), and repair poor ground (G101, G102).
12. Reconnect gauge assembly connector A (30P).





13. Connect PCM connector terminal B4 to body ground with a jumper wire, and turn the ignition switch ON (II).
Does the A/T TEMP indicator come on?
YES - Check for a loose or poor connection at PCM connector terminal B4. If necessary, substitute a known-good PCM and recheck.
NO - Replace faulty printed circuit board in the gauge assemblymen