2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 2012
1. Disconnect the transmission X176 24-way connector. Ignition ON. The scan tool Direction IMS parameter should display HIGH for the R1,
R2, D1, D2 and S signal circuit displays.
瀚慖f a signal displays LOW, disconnect the PIM connector X1 and test the circuit for a short to ground.
瀚慖f the circuit tests normal, replace the PIM.
2. Install DT-48493 to the vehicle harness connector X176. Verify that a test lamp illuminates between the Direction IMS switch ground circuit
and battery positive.
瀚慖f 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.
瀚慖f the circuit tests normal, replace the PIM.
3. Connect a 3-amp fused jumper wire between each Direction IMS signal circuit at DT-48493 and the ground circuit terminal. The scan tool
parameter should display LOW for each signal circuit when grounded.
瀚慖f 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.
瀚慖f the circuit tests normal, replace the PIM.
4. Disconnect the transmission 16-way X175 connector. Install DT-47825-10 to the vehicle harness. Connect a 3-amp fused jumper wire
between the Starter signal circuit terminal and ground. The scan tool parameter should display LOW when the signal circuit is grounded.
瀚慖f 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.
瀚慖f 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.
5. Disconnect the IMS connector at the switch.
Important: Connect one end of the DT-48493 to the transmission connector. Use the other end as the terminal testing point.
瀚慣est 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.
瀚慣est 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.
瀚慖f the circuit, including the TCM, tests normal, replace the IMS switch.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the repair.
* Control Module References (See: Testing and Inspection/Programming and Relearning) for PIM or TCM replacement, setup, and
programming.
* Manual Shift Shaft Position Switch Replacement (See: Powertrain Management/Computers and Control Systems/Sensors and Switches -
Computers and Control Systems/Transmission Position Sensor/Switch/Service and Repair/2ML70 - Automatic Transmission).
* Transmission Control Wiring Harness Extension Harness Removal (See: Transmission and Drivetrain/Automatic
Transmission/Transaxle/Service and Repair/Overhaul/2ML70 - Automatic Transmission/5. Transmission Control Wiring Harness Extension
Harness Removal).
P184A
DTC P181C-P181F, P183A-P183E, P184A, or P184B
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
