Circuit Description
The powertrain control module (PCM) uses the crankshaft position (CKP) sensor, input speed sensor (ISS) and output speed sensor (OSS) to determine engine speed, input shaft speed and output shaft speed. These sensor readings are used to determine the current gear ratio and RPM slip across the torque converter. The PCM uses this information from the sensors to determine if the commanded gear matches the actual gear. DTC P0730 sets when the PCM attempts to command an upshift to 2nd , 3rd and 4th gears, but the ISS signal does not change RPM to indicate a gear change for any of the commanded upshift gears. In this instance, most likely the vehicle will not move. This DTC is an indicator that all gears are probably being affected by the same condition.
DTC Parameters
DTC P0730 will set if there is no ISS pulldown (change in RPM) after a commanded upshift to 2nd , 3rd and 4th gear when:
| • | The vehicle speed = 0 mph |
| • | The condition exists once in the ignition cycle (2001)* |
| • | The condition exists for 1 time, 1 minute is allowed to elapse, then condition exists again in the same ignition cycle (2000) |
| • | The vehicle is started from a stop |
| • | No ISS DTCs have been set |
DTC P0730 diagnostic runs continuously once the above conditions have been met.
DTC P0730 is a type A DTC for 2000, type B for 2001.*
*Applicable to vehicles built after June 2000.
Diagnostic Aids
If any transaxle range switch or pressure control solenoid DTCs are set, diagnose those DTCs first.
Verify all manual gears selected (PRNDL) read correctly on Scan tool.
Verify TRANSMISSION ISS and TRANSMISSION OSS read correctly on Scan tool.
Possible causes of DTC P0730:
| • | Manual valve disconnected. |
| • | Transaxle range selector switch indicates a forward gear, but transaxle is hydraulically in neutral. |
