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• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Transmission Range Signal A | P182E | P1915 | P1915 | P182E, P1915 |
Transmission Range Signal B | P1915 | P182E | P182E | P182E, P1915 |
Transmission Range Signal C | P1915 | P182E | P182E | P182E, P1915 |
Transmission Range Signal P | P182E | P1915 | P1915 | P182E, P1915 |
Ground | -- | P182E | P182E | P182E, P1915 |
Circuit | Normal Range | Short to Ground | Open | Short to Voltage |
---|---|---|---|---|
Operating Conditions: Ignition ON, range selector in Park | ||||
Transmission Range Switch Signal A | Low | Low | High | High |
Transmission Range Switch Signal B | High | Low | High | High |
Transmission Range Switch Signal C | High | Low | High | High |
Transmission Range Switch Signal P | Low | Low | High | High |
High = 12 volts Low = 0 volts |
The internal mode switch (IMS) assembly is a sliding contact switch attached to the manual shift detent lever shaft inside the transmission. The 4 inputs to the transmission control module (TCM) from the switch indicate which position is selected by the transmission manual shaft. The input voltage at the TCM is high when the switch is open and low when the switch is closed to ground. The state of each input is displayed on the scan tool as IMS. The IMS input parameters represented are transmission range Signal A, Signal B, Signal C, and Signal P.
• | The engine speed is 400 RPM or greater for 5 seconds. |
• | The ignition voltage is 9.0 volts or greater. |
• | DTC P0101, P0102, P0103, P0106, P0107, P0108, P0171, P0172, P0174, P0175, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, P0401, P042E, P0722, or P0723 is not set. |
• | The engine torque signal is valid. |
• | DTC P0722, P0723, or P1915 is not set. |
• | The transmission output shaft speed is 90 RPM or less. |
• | The ignition voltage is 6.0 volts or greater. |
The IMS does not indicate a valid Park, Reverse, Neutral, or Drive Range position for 7 seconds.
The manual shift shaft switch assembly does not indicate Park or Neutral during the following sequence:
• | The engine speed is less than 50 RPM for greater than 0.10 second. |
• | The engine speed is 50-480 RPM for greater than 0.07 second. |
• | The engine speed is greater than 500 RPM and the transmission input speed is greater than 100 RPM for greater than 1.25 seconds. |
• | DTCs P182E and P1915 are Type A DTCs. |
• | The TCM commands maximum line pressure. |
• | The TCM turns OFF all solenoids. |
• | The TCM freezes transmission adaptive functions. |
• | The TCM limits the transmission to reverse and 5th gear. |
• | The TCM forces the torque converter clutch (TCC) OFF. |
• | The TCM inhibits the Tap Up/Tap Down function. |
• | The TCM inhibits manual shifting of forward gears. |
• | The TCM turns the high side driver OFF. |
• | The TCM enables torque management. |
DTCs P182E and P1915 are Type A DTCs.
Automatic Transmission Controls Schematics
• | Electronic Component Description for manual shift detent lever with shaft position switch assembly |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
DT-48616-10 Adapter Harness
For equivalent regional tools, refer to Special Tools .
⇒ | If not the expected results, refer to DTC P0850-P0852 . |
Note: You must perform Circuit/System Verification first.
⇒ | If not the specified value, replace the Q8 control solenoid valve assembly. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement . |
• | Switch Signal A: terminal B to ground circuit terminal F |
• | Switch Signal B: terminal C to ground circuit terminal F |
• | Switch Signal C: terminal D to ground circuit terminal F |
• | Switch Signal P: terminal E to ground circuit terminal F |
⇒ | If not the specified value, replace the Q8 control solenoid valve assembly. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Note: Before replacing the TCM, perform the Control Solenoid Valve and Transmission Control Module Assembly Inspection . |
• | Refer to Control Module References for control solenoid valve assembly replacement, set-up, and programming. |
• | Perform the Transmission Adaptive Values Learn following all transmission related repairs. |
• | For IMS replacement, perform the Manual Shift Detent Lever with Shaft Position Switch Assembly Replacement . |
© Copyright Chevrolet. All rights reserved |
© Copyright Chevrolet. All rights reserved |