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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 |
---|---|---|---|---|
Pressure Control Solenoid 3 Control | P0970 | P0971 | P0971 | P0969 |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: OK | ||||
Pressure Control Solenoid Valve 3 Control | -- | -- | -- | Fault or Malfunction |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: OK | ||||
Pressure Control Solenoid Valve 3 Control | Fault or Malfunction | -- | -- | -- |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Operating Conditions: Engine running, normal operating temperature Parameter Normal Range: OK | ||||
Pressure Control Solenoid Valve 3 Control | - | Fault or Malfunction | Fault or Malfunction | -- |
The clutch pressure control (PC) solenoid 3 is part of the control solenoid valve assembly which has no serviceable components. The normally high clutch PC solenoid 3 regulates and directs oil pressure to the R1/4-5-6 regulator valve. Increasing clutch PC solenoid 3 pressure increases pressure to the low and reverse clutch or 4-5-6 clutch, depending on the position of the clutch select valve. The transmission control module (TCM) PC Solenoid 3 low side driver varies current to the solenoid. Decreasing the current to clutch PC solenoid 3 increases oil pressure by closing off the solenoid exhaust port. Increasing the current to the clutch PC solenoid 3 decreases oil pressure by opening the exhaust port. Clutch PC solenoid 3 power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuit and components from excessive current flow. If excessive current flow is detected, the HSD will turn OFF. When the fault is corrected, the HSD will reset.
• | The engine speed is greater than 400 RPM for 5 seconds. |
• | The ignition voltage is 9.0 volts or greater. |
The TCM detects an internal electrical performance malfunction of the clutch PC solenoid 3 control circuit where the measured clutch PC solenoid 3 currents does not equal the commanded clutch PC solenoid 3 current for 5 seconds.
The TCM detects a short-circuit to ground on the clutch PC solenoid 3 control circuit for 1 second.
The TCM detects an open or short-circuit to voltage on the clutch PC solenoid 3 control circuit for 1 second.
• | DTC P0969 is a Type C DTC. |
• | The TCM freezes transmission adaptive functions on the low and reverse clutch and the 4-5-6 clutch. |
• | DTC P0970 is a Type A DTC. |
• | The TCM limits the transmission to 5th gear and reverse. |
• | The TCM commands maximum line pressure. |
• | The TCM freezes transmission adaptive functions. |
• | The TCM forces the torque converter clutch (TCC) OFF. |
• | The TCM forces the high side driver OFF. |
• | The TCM enables torque management. |
• | The TCM inhibits Tap Up/Down function. |
• | The TCM inhibits manual shifting of forward gears. |
• | DTC P0971 is a Type A DTC. |
• | The TCM limits the transmission to 4th gear and reverse. |
• | The TCM freezes transmission adaptive functions. |
• | The TCM commands maximum line pressure. |
• | The TCM inhibits Tap Up/Down function. |
• | The TCM inhibits manual shifting of forward gears. |
• | DTC P0969 is a Type C DTC. |
• | DTCs P0970 and P0971 are Type A DTCs. |
Automatic Transmission Controls Schematics
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 .
• | Pressure Control Solenoid Valve 3 Performance Test Status |
• | Pressure Control Solenoid Valve 3 Control Circuit High Voltage Test Status |
• | Pressure Control Solenoid Valve 3 Control Circuit Low Voltage Test Status |
Note: You must perform the Circuit/System Verification first.
• | Pressure Control Solenoid Valve 3 Performance Test Status |
• | Pressure Control Solenoid Valve 3 Control Circuit High Voltage Test Status |
• | Pressure Control Solenoid Valve 3 Control Circuit Low Voltage Test Status |
⇒ | If any test status parameter displays Fault or Malfunction, 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. |
© Copyright Chevrolet. All rights reserved |
© Copyright Chevrolet. All rights reserved |