• | 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. |
IMS Circuits/Parameter | Selector Position | ||||
---|---|---|---|---|---|
Park | Reverse | Neutral | Drive | Manual | |
Direction Switch Operating Conditions: Ignition ON, range selector in appropriate gear | |||||
Direction IMS D1 | HIGH | HIGH | LOW | LOW | LOW |
Direction IMS D2 | LOW | LOW | HIGH | HIGH | HIGH |
Direction IMS R1 | HIGH | LOW | LOW | HIGH | HIGH |
Direction IMS R2 | LOW | HIGH | HIGH | LOW | LOW |
Direction IMS Start | LOW | HIGH | LOW | HIGH | HIGH |
Range Switch Operating Conditions: Ignition ON, range selector in appropriate gear | |||||
IMS A | LOW | LOW | HI | HI | HI |
IMS B | HI | LOW | LOW | LOW | HI |
IMS C | HI | HI | HI | LOW | LOW |
IMS P | LOW | HI | LOW | HI | LOW |
Always HIGH status: Open/short to voltage condition Always LOW status: Short to ground condition Every status HIGH for either switch indicates an open ground circuit or connector for that portion of the IMS. |
The internal mode switch (IMS) assembly is a sliding contact switch attached to the control valve body within the transmission. The nine outputs from the switch indicate which position is selected by the transmission manual shaft. Four outputs (A, B, C, P), are range selection inputs to the transmission control module (TCM). Five outputs (R1, R2, D1, D2, S) are direction selection inputs to the hybrid powertrain control module (HPCM). The input voltage at the module is high when the switch is open and low when the switch is closed to ground.
The HPCM compares the requested direction to other data to verify that the indicated direction range switch calculation is correct.
• | The ignition is ON. |
• | Ignition voltage is 8-18 volts. |
• | No IMS direction switch DTCs are set. |
• | A valid IMS direction indicated by the IMS switch does not match the direction indicated by the HPCM software. |
• | No IMS direction switch DTCs are set. |
• | Two valid IMS directions are indicated at the same time. |
• | One IMS direction switch circuit has failed. |
• | The HPCM calculates a transmission direction based upon the remaining IMS circuits but it does not match the direction indicated by the HPCM software. |
• | One IMS direction switch circuit has failed. |
• | Based upon the remaining IMS circuits the HPCM calculated two directions at the same time. |
More than one IMS direction circuit has failed and the HPCM cannot calculate a transmission direction.
• | DTC P16F2 is a Type A DTC. |
• | The HPCM commands the battery energy control module (BECM) to open the high voltage contactor relays. |
DTC P16F2 is a Type A DTC.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
• | DT-47825-10 Jumper Harness |
• | DT-48493 Jumper Harness |
⇒ | If the Direction IMS operation does not match the logic table proceed with Circuit/System Testing. |
⇒ | If the DTC resets, program the PIM with the latest software version and recheck for DTCs. IF the DTC resets after programming or if the PIM already contains the latest software version, replace the PIM. |
⇒ | If a signal displays LOW, disconnect the PIM connector X1 and test the circuit for a short to ground. |
⇒ | If the circuit tests normal, replace the PIM. |
⇒ | If the test lamp does not illuminate, disconnect PIM connector X1 and test the ground circuit for an open, high resistance or short to voltage condition. |
⇒ | If the circuit tests normal, replace the PIM. |
⇒ | If a scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition. |
⇒ | If the circuit tests normal, replace the PIM. |
⇒ | If the scan tool parameter always displays HIGH, disconnect PIM connector X1 and test the circuit for an open, high resistance or short to voltage condition. |
⇒ | If the circuit tests normal, replace the PIM. |
Important: The remaining diagnostic steps test the internal transmission components and circuits. The automatic transmission fluid pan assembly must be removed in order to perform the diagnostic tests.
Important: Connect one end of the DT-48493 to the transmission connector. Use the other end as the terminal testing point.
⇒ | Test the direction signal circuits and the ground circuit between the IMS and the transmission 24-way X176 connector for a short to ground, open, high resistance or short to voltage condition. |
Important: Connect one end of the DT-47825-10 to the transmission connector. Use the other end as the terminal testing point.
⇒ | Test the Starter signal circuit between the IMS and the transmission 16-way X175 connector for a short to ground, open, high resistance or short to voltage condition. The TCM is a pass-through of the Starter signal circuit and should be tested as a typical circuit path. |
⇒ | If the circuit, including the TCM, tests normal, replace the IMS switch. |
Perform the Diagnostic Repair Verification after completing the repair.
• | Control Module References for PIM or TCM replacement, setup, and programming. |