DTC Troubleshooting: P0502 (17)
DTC P0502:
 Output Shaft (Countershaft) Speed Sensor Circuit Malfunction
NOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
  1. Test-drive the vehicle with the speed more than 20 km/h (12.5 mph).
  1. Check the vehicle speed with the HDS.
Is the correct speed indicated?
YES -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the ECM.■
NO -
Go to Step 3 .
  1. Turn the ignition switch OFF.
  1. Disconnect the output shaft (countershaft) speed sensor 3P connector.
  1. Turn the ignition switch ON (II).
  1. Measure voltage between output shaft (countershaft) speed sensor 3P connector terminal No. 1 and body ground.
Is there about 5 V?
YES -
Go to Step 11 .
NO -
Go to Step 7 .
  1. Turn the ignition switch OFF, and wait 2 minutes.
  1. Disconnect ECM connector No. 1 (96P).