Schematic Reference
Hybrid Controls Schematics ()
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (See: Diagnostic Trouble Code Descriptions/Powertrain Diagnostic Trouble Code
(DTC) Type Definitions)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning)for scan tool information
Special Tools
J 38522 - Variable Signal Generator
For equivalent regional tools, refer to Special Tools ().
Circuit/System Verification
1. Ignition ON with the engine OFF, command the Aux. Trans. Pump Speed to 50 percent with the scan tool. Attempt to maintain pump
operation for at lease 60 seconds.
2. Observe the aux. trans. fluid pump actual display and the aux. trans. fluid pump commanded displays with the scan tool. Actual pump speed
should be maintained within 10 percent of commanded. The pump should not make excessive noise or stall.
锟斤拷If the actual speed is within 10 percent of commanded speed an electrical fault condition is not currently present, if an aux. trans. fluid
pump pressure fault is suspected, test the aux. trans. pump line pressure output. Refer to Line Pressure Check (See: Transmission and
Drivetrain/Automatic Transmission/Transaxle/Testing and Inspection/Component Tests and General Diagnostics/2ML70 - Automatic
Transmission/Line Pressure Check).
锟斤拷If the difference between actual and commanded speed is greater than 10 percent, the pump is noisy, or the pump stalls, proceed to
Circuit/System Testing.
Circuit/System Testing
1. Inspect for DTC P0C2B. Diagnose P0C2B before performing this procedure.
2. Ignition ON, engine OFF, observe the Aux. Trans. Fluid Pump Fault Status 1 and Aux. Trans. Fluid Fault Status 2 displays with the scan
tool.
3. Command the aux. trans. fluid pump speed to 50 percent with the scan tool while observing the fault status displays.
锟斤拷Refer to the applicable diagnostic procedure below for the fault status indicated by the scan tool display.
锟斤拷If No Fault status is displayed, review the Freeze Frame/Failure Records and perform the diagnosis indicated by the Fault Status
parameter display.
PWM Input Fault
1. Ignition OFF, disconnect PIM connector X1.
2. Ignition ON, test for 11-13V on the Trans. Aux. Oil Pump Control circuit from PIM connector X1 terminal 3 and chassis ground.
锟斤拷If less than the specified range, test the control circuit for an open or short to ground. If the circuit tests normal, replace the ATFP Control
Module.
Note: Only connect the J 38522 - variable signal generator to the auxiliary transmission fluid pump control circuit when adjusted to 50
percent duty cycle. Duty cycles of less than 50 percent may damage the auxiliary transmission fluid pump assembly.
3. Pre-Adjust the J 38522 - variable signal generator to 50 percent duty cycle @ 250 Hz.
4. Connect the J 38522 - variable signal generator to the Trans. Aux. Oil Pump Control circuit, from the PIM connector X1 terminal 3 and
ground and listen for auxiliary transmission fluid pump motor operation.
锟斤拷If pump operation is audible, replace the PIM.
