Transmission Outputs
Shift Solenoid Check Operation
| DTCs | SS A P0750 - open circuit P0751 - functionally failed off P0752 - functionally failed on P0973 - short to ground P0974 - shorts to power P1714 ISIG functional (4R70 only, replaces P0751, P0752) SS B P0755 - open circuit P0756 - functionally failed off P0757 - functionally failed on P0976 - short to ground P0977 - shorts to power P1715 ISIG functional (4R70 only, replaces P0756, P0757) SS C P0760 - open circuit P0761 - functionally failed off P0762 - functionally failed on P0979 - short to ground P0980 - shorts to power SS D P0765 - open circuit P0766 - functionally failed off P0767 - functionally failed on P0982 - short to ground P0983 - shorts to power SS E P0770 - open circuit P0771 - functionally failed off P0772 - functionally failed on P0985 - short to ground P0986 - shorts to power |
| Monitor execution | electrical - continuous, functional - during off to on solenoid transitions |
| Monitor Sequence | None |
| Sensors OK | |
| Monitoring Duration | 0.5 to 5 seconds for electrical checks, 10 solenoid events for functional check |
TYPICAL SHIFT SOLENOID ISIG FUNCTIONAL CHECK ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Transmission Fluid Temp | 70 °F | 225 °F |
| Throttle Position | positive drive torque (actual TP varies) |
TYPICAL SHIFT SOLENOID MECHANICAL FUNCTIONAL CHECK ENTRY CONDITIONS
| Entry Conditions (with turbine speed) | Minimum | Maximum |
| Gear ratio calculated | each gear | |
| Throttle position | positive drive torque |
TYPICAL SHIFT SOLENOID MECHANICAL FUNCTIONAL CHECK ENTRY CONDITIONS
| Entry Conditions (without turbine speed) | Minimum | Maximum |
| Gear ratio calculated | each shift | |
| Throttle position | positive drive torque |
TYPICAL SHIFT SOLENOID MALFUNCTION THRESHOLDS
| Electrical circuit check: Output driver feedback circuit does not match commanded driver state for 0.5 - 5.0 seconds Electrical current check: Feedback current out of range for 0.5 seconds ISIG functional check: ISIG chip hardware circuit does not detect characteristic current dip and rise produced by solenoid movement. Mechanical functional check: Actual obtained gear or shift pattern indicates which shift solenoid is stuck on or off. |
GEAR RATIO CHECK OPERATION
| DTCs | P0731 incorrect gear 1 ratio P0732 incorrect gear 2 ratio P0733 incorrect gear 3 ratio P0734 incorrect gear 4 ratio P0735 incorrect gear 5 ratio P0729 incorrect gear 6 ratio P0736 incorrect reverse ratio |
| Monitor Execution | Continuous, in each gear |
| Monitor Sequence | None |
| Sensors OK | TSS, OSS, wheel speed |
| Monitoring Duration | 12 seconds |
TYPICAL FORWARD GEAR RATIO CHECK ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Gear selector position | forward range, > 8 seconds |
|
| Engine Torque | 100 NM | |
| Throttle position | 10% | |
| Not shifting | > 0.5 seconds | |
| Engine/input Speed | 550 rpm | |
| Output Shaft Speed | 250 rpm | 1350 rpm |
TYPICAL NEUTRAL GEAR RATIO CHECK ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Gear selector position | forward range, > 1 seconds |
|
| Absolute value of Engine rpm - turbine rpm | 150 rpm | |
| Output shaft speed | 250 rpm | 1350 rpm |
TYPICAL GEAR RATIO MALFUNCTION THRESHOLDS
| Forward gear check: > 30 rpm error in commanded ratio for > 1.8 seconds that repeats 3 times |
TORQUE CONVERTER CLUTCH CHECK OPERATION
| DTCs | P0740 - open circuit P0742 - short to ground P0744 - short to power P0741 - functionally stuck off P2758 - functionally stuck on P1740 - Inductive signature (4R70 only, replaces P0741 / P2758) |
| Monitor Execution | electrical - continuous, mechanical - during lockup |
| Monitor Sequence | None |
| Sensors OK | TSS, OSS |
| Monitoring Duration | Electrical - 5 seconds, Functional - 5 lock-up events |
TYPICAL TCC ISIG FUNCTIONAL CHECK ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Transmission Fluid Temp | 70 °F | 225 °F |
| Engine Torque | positive drive torque | |
| Commanded TCC duty cycle for 0 rpm slip | 60% | 90% |
TYPICAL TCC MECHANICAL FUNCTIONAL CHECK STUCK OFF ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Throttle Position | steady | |
| Engine Torque | positive drive torque | |
| Transmission Fluid Temp | 70 °F | 225 °F |
| Commanded TCC duty cycle (0 rpm slip) | 60% | 100% |
| Not Shifting |
TYPICAL TCC MALFUNCTION THRESHOLDS
| Electrical circuit check: Output driver feedback circuit does not match commanded driver state for 0.5 - 5.0 seconds Electrical current check: Feedback current out of range for 0.5 seconds ISIG functional check: ISIG chip hardware circuit does not detect characteristic current dip and rise produced by solenoid movement. Mechanical check, stuck off: Slip across torque converter > 100 - 200 rpm or speed ratio < 0.93 Mechanical check, stuck on: Slip across torque converter < 20 rpm with converter commanded off Mechanical check, stuck on: engine rpm < 100 after drive engagement (engine stall) |
PRESSURE CONTROL SOLENOID CHECK OPERATION
| DTCs | P0960 - open circuit P0960 - short to ground P0963 - short to power |
| Monitor Execution | Continuous |
| Monitor Sequence | None |
| Sensors OK | |
| Monitoring Duration | Electrical: 5 seconds, Mechanical functional: up to 30 seconds |
TYPICAL PRESSURE CONTROL SOLENOID MECHANICAL FUNCTIONAL CHECK ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Gear ratio calculated | each gear | |
| Transmission Fluid Temperature | 70 °F | 225 °F |
| Throttle Position | positive drive torque |
TYPICAL PRESSURE CONTROL SOLENOID MALFUNCTION THRESHOLDS
| Electrical circuit check: Output driver feedback circuit does not match commanded driver state for 0.5 - 5.0 seconds Electrical current check: Feedback current out of range for 0.5 seconds Mechanical functional check: Actual obtained gear pattern indicates Pressure Control solenoid fault |
INDUCTIVE SIGNATURE CHIP COMMUNICATION CHECK OPERATION
| DTCs | P1636 ISIG chip loss of communication |
| Monitor Execution | off-to-on solenoid transitions (ISIG) continuous for ADLER (driver chip that controls shift solenoids on the 6 speed transmissions) |
| Monitor Sequence | None |
| Sensors OK | |
| Monitoring Duration | < 100 solenoid events (ISIG) 5 30ms loops without communication (ADLER) |
TYPICAL INDUCTIVE SIGNATURE OR ADLER CHIP COMMUNICATION CHECK ENTRY CONDITIONS
| Entry Conditions | Minimum | Maximum |
| Transmission Fluid Temp | 70 °F | 225 °F |
| Solenoid commanded off duration | < 2 seconds |
TYPICAL INDUCTIVE SIGNATURE COMMUNICATION CHIP MALFUNCTION THRESHOLDS
| Checksum error, chip not responding |