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. During normal driving conditions, the PCM will adapt main line pressure via the pressure control (PC) solenoid to prevent slipping and harsh shifts. Shift solenoid 2 is used to apply or release second gear clutch. The PCM controls 2nd gear by controlling the ground for shift solenoid 2. The PCM will turn the solenoid Off (open the driver circuit) when second gear is commanded On to apply 2nd clutch. Shift solenoid 2 is supplied ignition voltage from the fuel pump relay whenever the PCM commands the fuel pump relay On. DTC P0732 sets when 2nd clutch still slips after the PCM has commanded high main line pressure.
DTC Parameters
DTC P0732 will set if the PCM detects an incorrect actual 2nd gear ratio when 2nd gear is commanded On when:
| • | The condition exists for longer than 3 seconds (2001)* |
| • | The condition exists for longer than 3 seconds, 1 minute is allowed to elapse, then condition again exists for longer than 3 seconds (2000) |
| • | The high main line pressure has been commanded |
| • | The transaxle is in a forward gear |
| • | The input speed is greater than 224 RPM |
| • | The vehicle speed is greater than 5 km/h (3 mph) |
| • | The speed noise parameter = NO |
| • | The steady state ratio fail counter equals 255 for an in-gear failure, or the shift fail counter is greater than 100 on a downshift or upshift to 2nd gear (128=0 or normal operation) |
DTC P0732 diagnostic runs continuously once the above conditions have been met.
DTC P0732 is a type A DTC for 2000, type B for 2001.*
*Applicable to vehicles built after June 2000.
Diagnostic Aids
Important: If DTCs P0745, P0746, P0756, P0758, P0761, P0763, P0766, P0768 or P0789 is set, diagnose that DTC first. A diagnosed PC solenoid, shift solenoid 2, 3 or 4 low/high circuit fault DTC may have caused DTC P0732 to set.
Important: If any shift solenoid performance DTCs P0782 or P0783 3rd or 4th gear stuck On) are set, diagnose the highest gear first. A 3rd or 4th gear stuck On may cause no 2nd gear.
Refer to Pressure Ports - Air Check and Part Description for pressure apply points and for component/location description.
Possible causes of no 2nd gear are listed in the flowchart on the succeeding page.
Verify TRANSMISSION ISS and TRANSMISSION OSS read correctly on Scan tool.
Make sure the pressure control, shift 2, shift 3 and shift 4 solenoids are not intermittently sticking. Sticking shift solenoid 3 or 4 may cause 3rd or 4th gear to be applied from an initial start causing no 2nd gear. Audible sound should be similar for all solenoids. A muffled tone indicates the need for replacement.
Notice: There are different cases and different FWD/REV servo pistons for different model years. Incorrect use of these parts may result in no 2nd gear.
