Problem with shift interlock system .
Automatic Transmission Shift Lock Control Description and Operation
The automatic transmission shift lock control system is a safety device that prevents an inadvertent shift out of PARK when the engine is running. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
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The automatic transmission shift lock control solenoid
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The body control module (BCM)
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The powertrain control module (PCM)
With the ignition in the ON position, battery positive voltage is supplied to the automatic transmission shift lock control solenoid. The automatic transmission shift lock control solenoid receives a ground from the BCM. When the automatic transmission shift lock control solenoid is energized, the shift lever mechanically locked in the PARK position. When the driver presses the brake pedal the PCM sends a class 2 serial data message to the BCM. The BCM turns OFF the ground control circuit and this de-energizes the automatic transmission shift lock control solenoid. When the automatic transmission shift lock control solenoid is de-energized, the shift lever may be moved out of the PARK position. The BCM determines transaxle shift lever position through a class 2 serial data message from the PCM. The PCM receives inputs from the park/neutral position switch and determines shift lever position. When the BCM receives this information and determines that the shift lever is out of the PARK position, the automatic transmission shift lock control solenoid ground is opened.
1
Did you perform the A Diagnostic System Check - Automatic Transmission Shift Lock Control?
Go to Step 2
Go to Diagnostic System Check - Automatic Transmission Shift Lock Control
2
- Turn ON the ignition, with the engine OFF.
- Press and hold the brake pedal.
- Attempt to move the shift lever out of the PARK position.
Does the shift lever move out of the PARK position?
YES - Go to
Testing for Intermittent Conditions and Poor Connections in Wiring Systems
NO - Go to Step 3
3
- Turn OFF the ignition.
- Disconnect the automatic transmission shift lock control solenoid.
- Turn ON the ignition, with the engine OFF.
- Attempt to move the shift lever out of the PARK position.
Does the shift lever move out of the PARK position?
YES - Go to Step 4
NO - Go to Step 5
4
Test the A/T shift lock control circuit for a short to ground. Refer to
Circuit Testing and
Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
YES - Go to Step 9
NO - Go to Step 6
5
Inspect for poor connections at the harness connector of the automatic transmission shift lock control solenoid. Refer to
Testing for Intermittent Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 9
Go to Step 7
6
Inspect for poor connections at the harness connector of the body control module (BCM). Refer to
Testing for Intermittent Conditions and Poor Connections and
Connector Repairs in Wiring Systems.
Did you find and correct the condition?
Go to Step 9
Go to Step 8
7
Replace the automatic transmission shift lock control solenoid. Refer to
Transmission Control Replacement in Automatic Transaxle-4T40-E/4T45-E.
Did you complete the replacement?
Go to Step 9
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8
Replace the body control module (BCM). Refer to
Body Control Module Replacement in Body Control System.
Did you complete the replacement?
Go to Step 9
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9
Operate the system in order to verify the repair.
Did you find and correct the condition?
System OK
Go to Step 2
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