PRE-RELEASE
DTC B270A
| DTC B270A |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC B270A 01
Park Lock Solenoid Control Circuit Short to Voltage
DTC B270A 02
Park Lock Solenoid Control Circuit Short to Ground
DTC B270A 04
Park Lock Solenoid Control Circuit Open
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Control
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B270A 02
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B270A 04
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B270A 01
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-
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Ground
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-
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B270A 04
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-
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| Circuit/System Description |
The body control module controls the automatic transmission park lock control solenoid by providing a battery positive voltage to the solenoid. The body control module controls the voltage supply circuit to the automatic transmission park lock control solenoid. The body control module monitors the voltage and current flow of the control circuit.
| Conditions for Running the DTC |
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The ignition is in the ON position.
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The brake pedal is pressed.
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The transmission is in the PARK position.
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The DTC runs continuously when the above conditions are met.
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| Conditions for Setting the DTC |
B270A 01
The body control module detects a short to voltage in the automatic transmission park lock control solenoid control circuit for 1 second.B270A 02
The body control module detects a short to ground in the automatic transmission park lock control solenoid control circuit for 1 second.B270A 04
The body control module detects an open in the automatic transmission park lock control solenoid control circuit for 1 second.| Action Taken When the DTC Sets |
The body control module will not attempt to enable the voltage supply circuit of the automatic transmission park lock control solenoid until the next key cycle.
| Conditions for Clearing the DTC |
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A current DTC B270A will clear when the malfunction is no longer present and the ignition switch is cycled.
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A history DTC will clear after 100 ignition cycles with no current DTC active during the 100 ignition cycles.
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| Reference Information |
Schematic Reference
Shift Lock Control Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Automatic Transmission Shift Lock Control Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
| 1. |
Ignition ON, observe the scan tool Brake Applied Output Signal parameter while pressing and releasing the brake pedal. The parameter should change from ON to OFF when the brake pedal is depressed.
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| 2. |
If the parameter does not change, refer to
Stop Lamps Malfunction
.
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| 3. |
While pressing the brake pedal, the vehicle operator should be able to move the shifter lever out of the park position.
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| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the S3 shift lock actuator.
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| 2. |
Ignition OFF, test for less than 1.0 Ω between the ground circuit terminal 2 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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Install a test lamp between the ground circuit terminal 2 and the control circuit terminal 4.
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| 5. |
Ignition ON, command the scan tool Shift Lock Solenoid Actuator ON and OFF. The test lamp should turn ON and OFF when changing between the commanded states.
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| 6. |
If the test lamp is always ON, test the control circuit for short to voltage. If the circuit tests normal, replace the K9 Body Control Module.
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If the test lamp is always OFF, test the control circuit for short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.
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| 8. |
If all circuits test normal, test or replace the S3 shift lock actuator.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Transmission Control Replacement
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Control Module References
for ECM replacement, setup, and programming.
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