## Automatic Transmission

#### DTC Troubleshooting (cont'd)

14-78

DTC P0720: Problem in Countershaft Speed Sensor Circuit NOTE:

- Record all freeze date before you troubleshoot.
- The illustration shows the example of connector terminal arrangement; connector terminal arrangement varies with the models.

1. Check the countershaft speed sensor installation.

Is the countershaft speed sensor installed properly?

YES - Go to step 2.

NO - Reinstall and recheck.

2. Disconnect countershaft speed sensor connector (2P).
3. Measure countershaft speed sensor resistance at the sensor connector.

COUNTERSHAFT SPEED SENSOR CONNECTOR

Terminals side of male terminals

Is there 400-600 ohm?

YES - Go to step 4.

NO - Replace the countershaft speed sensor.

4. Disconnect PCM connector C (22P).

5. Check for continuity between PCM connector terminal C14 and body ground and between terminal C15 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 C14 and C15 and the countershaft speed sensor.

NO - Go to step 6.

6. Connect countershaft speed sensor connector.
7. Measure the resistance between PCM connector terminals C14 and C15.

PCM CONNECTOR C (22P)

Wire side of female terminals

Is there 400-600 ohm?

YES - Check for loose terminal fit in the PCM connectors. If necessary, substitute a known-good PCM and recheck.

NO - Repair loose terminal or open in the wires between PCM connector terminals C14 and C15 and the countershaft speed sensor.