Diagnostic Instructions
DTC Descriptor
DTC P0742 : Torque Converter Clutch (TCC) System - Stuck On
DTC P0752: 1-2 Shift Solenoid (SS) Valve Performance - No Second or Third Gear
DTC P0757: 2-3 Shift Solenoid (SS) Valve Performance - No Third, Fourth or Fifth Gear
DTC P0762: 4-5 Shift Solenoid (SS) Valve Performance - No Fifth Gear
Circuit/System Description
The transmission control module (TCM) controls the torque converter clutch pulse width modulation (TCC PWM) solenoid valve. The solenoid controls the hydraulic fluid for TCC apply and release. When the TCC is fully applied, the engine is
coupled directly to the transmission through the TCC. The TCC used is an electronically controlled capacity clutch (ECCC). The TCM will normally allow a small amount of slip to occur with the ECCC. When the TCC is engaged, TCC slip speed is maintained at approximately
20 to 50 RPM. The 1-2 shift solenoid (SS) valve, 2-3 SS valve and the 4-5 SS valve are supplied with fused ignition voltage. The ground path is controlled by the TCM. When the TCM commands the solenoid OFF, a ground path
is not provided and the filtered line pressure that is fed to the solenoid is exhausted. When the TCM commands the solenoid ON, a ground path is provided and the exhaust port is blocked, stopping the exhaust of line pressure. The TCM identifies a 1-2 SS
valve, 2-3 SS valve or a 4-5 SS valve condition by monitoring the commanded gear versus gear ratio. Refer to
Shift Solenoid Valve State and Gear Ratio
.
Conditions for Running the DTC
P0742
• | No TP sensor DTC P0120. |
• | No ISS DTCs P0716 or P0717. |
• | No OSS DTCs P0722 or P0723. |
• | No TCC stuck OFF DTC P0741. |
• | No IMS DTCs P1820, P1822, P1823, P1825, P1826 or P1915. |
• | No engine torque signal circuit DTC P2637. |
• | No TCC solenoid electrical DTCs P2763 or P2764. |
• | The engine run time is greater than 5 seconds. |
• | The transmission fluid temperature is 20-130°C (68-266°F). |
• | The engine torque is greater than 80 N·m (59 lb ft). |
• | The throttle position is 12-90 percent. |
• | The transmission is not in 1st gear and the gear ratio is 0.73:1 to 2.27:1. |
• | The vehicle speed is 15 km/h (9 mph) or greater. |
P0752
• | No TP sensor DTC P0120. |
• | No ISS DTCs P0716 or P0717. |
• | No OSS DTCs P0722 or P0723. |
• | No TCC stuck ON DTC P0742. |
• | No shift solenoid electrical DTCs P0973, P0974, P0976, P0977, P0979, or P0980. |
• | No IMS DTCs P1820, P1822, P1823, P1825, P1826 or P1915. |
• | No engine torque delivered signal DTC P2637. |
• | The engine run time is greater than 5 seconds. |
• | The IMS range is not PARK, NEUTRAL or REVERSE. |
• | The transmission fluid temperature is 20-130°C (68-266°F). |
• | The throttle position is 10 percent or more. |
• | The input shaft speed is 200-6,800 RPM. |
• | The output shaft speed is 100 RPM or more. |
• | The engine torque is greater than 32 N·m (24 lb ft). |
P0757
• | No TP sensor DTC P0120. |
• | No ISS DTCs P0716 or P0717. |
• | No OSS DTCs P0722 or P0723. |
• | No TCC stuck ON DTC P0742. |
• | No shift solenoid electrical DTCs P0973, P0974, P0976, P0977, P0979, or P0980. |
• | No IMS DTCs P1820, P1822, P1823, P1825, P1826 or P1915. |
• | No engine torque delivered signal DTC P2637. |
• | The engine run time is greater than 5 seconds. |
• | The IMS range is not PARK, NEUTRAL or REVERSE. |
• | The transmission fluid temperature is 20-130°C (68-266°F). |
• | The throttle position is 10 percent or more. |
• | The input shaft speed is 200-6,800 RPM. |
• | The output shaft speed is 100 RPM or more. |
P0762
• | No TP sensor DTC P0120. |
• | No ISS DTCs P0716 or P0717. |
• | No OSS DTCs P0722 or P0723. |
• | No TCC stuck ON DTC P0742. |
• | No shift solenoid electrical DTCs P0973, P0974, P0976, P0977, P0979, or P0980. |
• | No IMS DTCs P1820, P1822, P1823, P1825, P1826 or P1915. |
• | No engine torque delivered signal DTC P2637. |
• | The engine run time is greater than 5 seconds. |
• | The IMS range is not PARK, NEUTRAL or REVERSE. |
• | The transmission fluid temperature is 20-130°C (68-266°F). |
• | The throttle position is 10 percent or more. |
• | The input shaft speed is 200-6,800 RPM. |
• | The output shaft speed is 100 RPM or more. |
• | The engine torque is greater than 36 N·m (26.5 lb ft). |
Conditions for Setting the DTC
P0742
The following conditions occur 3 times in one ignition cycle:
• | The TCM commands the TCC OFF. |
• | The TCC slip is between -20 to +20 RPM for 3.5 seconds or more. |
P0752
Both of the following conditions must occur twice during the same trip:
• | The TCM commands 2nd gear and the resulting gear ratio is 3.33:1-3.50:1 for 1 second. |
• | The TCM commands 3rd gear and the resulting gear ratio is 0.98:1-1.03:1 for 1 second. |
P0757
Both of the following conditions must occur once during the same trip:
• | The TCM commands 3rd gear when the output shaft speed is 200 RPM or greater, the engine torque is greater than 20 N·m (15 lb ft), and the resulting gear ratio is 2.16:1-2.27:1 for 2 seconds. |
• | The TCM commands 4th or 5th gear when the engine torque is greater than 12 N·m (9 lb ft) and the resulting gear ratio is 3.33:1-3.50:1 for 2 seconds. |
P0762
The following conditions must occur twice during the same trip:
• | The TCM has commanded either 2nd or 3rd gear for 3 seconds or greater. |
• | The TCM commands 5th gear and the resulting gear ratio is 0.98:1-1.03:1 for 3.5 seconds. |
Action Taken When the DTC Sets
P0742
• | DTC P0742 is a Type B DTC. |
• | The TCM inhibits 5th gear if the transmission is in Hot Mode. |
• | The TCM freezes transmission adaptive functions. |
P0752
• | DTC P0752 is a Type B DTC. |
• | The TCM commands maximum line pressure. |
• | The TCM freezes transmission adaptive functions. |
• | The TCM inhibits 3-2 downshifts if the vehicle speed is greater than 8 km/h (5 mph). |
• | The TCM commands HSD1 OFF. |
• | The TCM inhibits Powertrain Braking. |
• | The TCM inhibits TAP shift operation. |
P0757
• | DTC P0757 is a Type B DTC. |
• | The TCM commands maximum line pressure. |
• | The TCM freezes transmission adaptive functions. |
• | The TCM commands HSD1 OFF. |
• | The TCM inhibits 4th and 5th gears. |
• | The TCM inhibits Powertrain Braking. |
• | The TCM inhibits Autograde Braking. |
• | The TCM inhibits TAP shift operation. |
P0762
• | DTC P0762 is a Type B DTC. |
• | The TCM commands maximum line pressure. |
• | The TCM freezes transmission adaptive functions. |
• | The TCM inhibits Powertrain Braking. |
• | The TCM inhibits TAP shift operation. |
Conditions for Clearing the DTC
DTCs P0742, P0752, P0757 and P0762 are Type B DTCs.
Diagnostic Aids
If the DTC is cleared, then will not reset when the vehicle is driven, some of the following conditions may exist:
• | Restricted fluid circuits |
• | Inspect transmission fluid lines to radiator. Lines may be pinched, plugged or twisted. |
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Transmission General Description
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Transmission Control Module Scan Tool Information
Circuit/System Verification
Start and idle the engine. Using the scan tool output controls, command the affected solenoid ON and OFF. Observing the CKT Status parameter on the scan tool for the affected solenoid, ensure that the parameter displays OK.
Circuit/System Testing
- Perform the
Transmission Fluid Check
.
⇒ | Correct the transmission fluid level if the fluid is not at the proper level. |
- Using the scan tool, clear the DTC. If DTC P0742 was set, operate the vehicle in D5 at 72 km/h (45 mph) with the Calc. Throttle Position greater than 15 percent, allowing the transmission shift to 5th gear. Use the scan
tool to command the TCC ON. Observe the TCC Slip Speed parameter on the scan tool. The TCC Slip Speed should be between -20 to 20 RPM.
⇒ | If the TCC Slip Speed is between 130-1,500 RPM for greater than 2.5 seconds, inspect the following components and repair or replace as necessary: |
- Using the scan tool, clear the DTC. If DTC P0752, P0757 or P0762 is set, drive the vehicle in D5 and ensure that the TCM commands 1st, 2nd, 3rd, and 4th gears. The ratios should match the commanded gear for all gears. Refer to
Shift Solenoid Valve State and Gear Ratio
.
⇒ | If the gear ratios do not match the commanded gear, inspect the following and repair or replace as necessary: |
P0752
• | The 1-2 shift valve O-ring worn or damaged. |
P0757
• | The 2-3 shift valve O-ring worn or damaged. |
P0762
• | The 4-5 shift valve O-ring worn or damaged. |
Component Testing
- Perform the
Shift Solenoid Leak Test
.
⇒ | If the solenoid fails the shift solenoid leak test, replace the affected solenoid. |
- Disconnect the wiring harness connector from the affected solenoid. Measure the resistance for the affected solenoid. The resistance should be between 15-20.3 ohms for the 1-2 SS, 2-3 SS and the 4-5 SS.
The resistance should be between 10-13.6 ohms for the TCC PWM solenoid.
⇒ | If the resistance is not within the specified range, replace the affected solenoid. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the repair.
• | Allow the transmission to operate through all gears. Ensure that the gear ratios match each commanded gear and the TCC slip speed is 100 RPM or greater with the TCC commanded OFF. |