DTC P0715: Problem in mainshaft Speed Sensor Circuit NOTE: Record all freeze data before you troubleshoot. The illustration shows the example of connector terminal arrangement; connector terminal arrangement varies with the models. Code 15, 15-1, P0715 on the PCM doesn't always mean there's an electrical problem in the mainshaft or countershaft speed sensor circuit; code 15, 15-1, P0715 may also indicate a mechanical problem in the transmission. Any problem causing irregular countershaft to mainshaft speed difference can cause this code. Check the mainshaft and countershaft speed sensor installation. Are the mainshaft and countershaft speed sensor installed properly? YES - Go to step 2. NO - Reinstall and recheck. Disconnect mainshaft speed sensor connector (2P). Measure mainshaft speed sensor resistance at the sensor connector. MAINSHAFT SPEED SENSOR CONNECTOR Terminal side of male terminals Is there 400-600 ohm? YES - Go to step 4. NO - Replace the mainshaft speed sensor.

Disconnect PCM connector C (22P). Check for continuity between PCM connector terminal C7 and body ground and between terminal C21 and body ground. PCM CONNECTOR C (22P) Wire side of female terminals Is there continuity? YES - Repair short to ground in the wires between PCM connector terminals C7 and C21 and the mainshaft speed sensor. NO - Go to step 6. Connect mainshaft speed sensor connector. Measure the resistance between PCM connector terminals C7 and C21. PCM CONNECTOR C (22P) Wire side of female terminals Is there 400-600 ohm? YES - Run the Electrical Troubleshooting Flowchart for code P0720 (code 9). Check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good PCM and recheck. NO - Go to step 8.