Allison - Automatic Transmission
DTC P0657 or P0658
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0657
-
Solenoid High Control Circuit Group 1
DTC P0658
-
Solenoid High Control Circuit Group 1 Low Voltage
Diagnostic Fault Information
Circuit/System Description
The transmission control module (TCM) provides B+ to the modulated main (MOD MAIN) pressure control solenoid, torque converter clutch (TCC) pressure control solenoid and pressure control solenoid 1 (PCS1) through a separate solid state device called high side driver 1 (HSD1). The TCM uses low side drivers to control the solenoids.
Conditions for Running the DTC
P0657
* DTC P0657 is not set.
* Battery voltage is between 9-18 V.
* Engine speed is greater than 200 RPM.
* HSD1 is commanded on.
P0658
* DTC P0658 is not set.
* Battery voltage is between 9-18 V.
* Engine speed is greater than 200 RPM.
* HSD1 is commanded on.
Conditions for Setting the DTC
P0657
The TCM detects an open circuit on 2 or more of the solenoids that are powered by HSD1 and the HSD1 voltage is 6 volts or greater for 1 second when the engine is cranking or running.
P0658
The TCM detects a short to ground on the HSD1 circuit for 1 second when the engine is running or cranking.
Action Taken When the DTC Sets
P0657
* DTC P0657 is a Type A DTC.
* The TCM limits the transmission to reverse, neutral and 3rd gear operation.
* The TCM inhibits TCC engagement.
* DTC P0657 is stored in TCM history.
P0658
* DTC P0658 is a Type A DTC.
* The TCM limits the transmission to reverse, neutral, and 1st, 3rd, or 5th gear operation.
* The TCM inhibits TCC engagement.
Conditions for Clearing the DTC
DTCs P0657 and P0658 are Type A DTCs.
Diagnostic Aids
You may have to drive the vehicle in order to experience a condition.
Reference Information
Schematic Reference
Automatic Transmission Controls Schematics Electrical Diagrams
Connector End View Reference
* Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
* Inline Harness Connector End Views X100
Description and Operation
* Transmission General Description Transmission General Description
* Transmission Component and System Description Transmission Component and System Description
* Electronic Component Description Electronic Component Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON, engine OFF, command the Modulated Main Pres. Ctrl. Sol., the TCC Control Solenoid, and the PC Solenoid 1 ON and OFF with a scan tool. Observe the scan tool Line PC Sol. Pressure Command, TCC PC Solenoid Pressure Command, and PC Solenoid 1 Pressure Command parameters. The parameters should change from 0 kPa (0 psi) to 1600 kPa (232 psi).
2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
1. Ignition OFF, disconnect the X175 harness connector at the transmission.
2. Ignition ON, engine OFF, verify that a test lamp illuminates between the B+ circuit terminal L and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the TCM. Refer to Transmission Control Module Replacement Service and Repair.
3. Connect a test lamp between the MAIN MOD solenoid control circuit terminal S and the B+ circuit terminal L.
4. Command the Modulated Main Pres. Ctrl. Sol ON and OFF with a scan tool and verify the Line PC Sol. Pressure Command parameter changes from 1600 kPa (232 psi) to 0 kPa (0 psi). The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the TCM.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the TCM.
5. Connect a test lamp between the PCS1 control circuit terminal M and the B+ circuit terminal L.
6. Command the PC Solenoid 1 ON and OFF with a scan tool and verify the PC Sol. 1 Pressure Command parameter changes from 1600 kPa (232 psi) to 0 kPa (0 psi). The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the TCM.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the TCM.
7. Connect a test lamp between the TCC solenoid control circuit terminal J and the B+ circuit terminal L.
8. Command the TCC Control Solenoid ON and OFF with a scan tool and verify the TCC Sol. Pressure Command parameter changes from 1600 kPa (232 psi) to 0 kPa (0 psi). The test lamp should turn ON and OFF when changing between the commanded states.
• If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the TCM.
• If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the TCM.
9. Remove the transmission oil pan. Refer to Oil Pan Replacement Service and Repair.
10. Test the transmission internal HSD1 B+ and PCS1, TCC, and MAIN MOD control circuits for a short to voltage, short to ground or an open/high resistance.
• If the circuits test normal, test the PCS1, TCC and MAIN MOD solenoids.
Component Testing
Static Testing
Note:
You must perform the Circuit/System Testing first.
1. Ignition OFF, remove the PSC1, TCC, and MAIN MOD solenoids from the valve body. Refer to Control Valve Solenoid Replacement (PCS1 and PCS2) Control Valve Solenoid Replacement (PCS1 and PCS2)Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD).
2. Test for resistance between the following terminals:
* Control circuit terminal 2 and B+ circuit terminal 1 of the PCS1 solenoid
* Control circuit terminal 2 and B+ circuit terminal 1 of the TCC solenoid
* Control circuit terminal B and B+ circuit terminal A of the MAIN MOD solenoid.
Refer to Temperature Versus Resistance (Solenoid) Temperature Versus Resistance (Solenoid)Temperature Versus Resistance (Transmission Fluid Temperature Sensor) Temperature Versus Resistance (Transmission Fluid Temperature Sensor)Temperature Versus Resistance (Speed Sensor) Temperature Versus Resistance (Speed Sensor).
• If not within the specified range, replace the affected solenoid or solenoids.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Wiring Harness Replacement Service and Repair
* Control Valve Solenoid Replacement (PCS1 and PCS2) Control Valve Solenoid Replacement (PCS1 and PCS2)Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD)
* Control Module References Control Module References for TCM replacement, setup, and programming
Repair Verification
If another DTC is present, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle and perform the appropriate diagnostic procedure.