DTC C1217. Chevrolet Impala 2002

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2002 🢒 Impala 🢒 Brakes 🢒 Antilock Brake System 🢒 DTC C1217

Circuit Description

The system relay is energized when the ignition is ON. The system relay supplies voltage to the solenoid valves and the pump motor. This voltage is referred to as the system voltage.

The electronic brake control module (EBCM) controls each solenoid valve by grounding the solenoid.

The EBCM controls the pump motor by grounding the control circuit. The pump serves 2 purposes:

•	Transfers brake fluid from the brake calipers to the master cylinder reservoir during pressure decrease events.

•	Transfers brake fluid from the master cylinder reservoir to the brake calipers during pressure increase events.

Conditions for Running the DTC

•	The pump motor has been commanded OFF for 1 second.

•	The system voltage is greater than 9.36 volts.

Conditions for Setting the DTC

One of the following conditions exists for 0.2 seconds:

•	The voltage across the pump motor is greater than 10.2 volts.

•	The pump motor low side voltage is less than 2.7 volts.

Action Taken When the DTC Sets

If equipped, the following actions occur:

•	The EBCM disables the ABS/TCS for the duration of the ignition cycle.

•	The DRP does not function optimally.

•	The ABS indicator turns ON.

•	The Traction Off indicator turns ON.

•	The message center displays the Service Traction System message.

Conditions for Clearing the DTC

•	The condition for the DTC is no longer present and the DTC is cleared with a scan tool.

•	The electronic brake control module (EBCM) automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

•	This DTC determines if there is a short in the pump motor control circuit.

•	The pump motor is integral to the BPMV. The pump motor is not serviceable.

Test Description

The number below refers to the step number on the diagnostic table.

Tests the pump motor circuits of the BPMV for a short to the housing of the BPMV.

Step

Action

Value(s)

Yes

Schematic Reference: Antilock Brake System Schematics

Connector End View Reference: Antilock Brake System Connector End Views

Did you perform the ABS Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - ABS

Turn OFF the ignition.

Important: Removing battery voltage or ground from the EBCM will result in the following conditions:

•	Loss of the TIM learned tire inflation configuration parameters in the EBCM.

•	The EBCM sets DTC C1245.

When the diagnosis is complete, inspect the tire pressures and perform the TIM reset. Refer to Tire Pressure Monitor Procedure in Tire Pressure Monitoring.

Disconnect the EBCM harness connector.
Connect the J 39700 universal pinout box using the J 39700-99 breakout box adapter to the EBCM harness connector only.
Test both ground circuits of the EBCM including the EBCM ground for a high resistance or an open.

Did you find and correct the condition?

Go to Step 8

Go to Step 3

Remove the EBCM from the BPMV. Refer to Electronic Brake Control Module Replacement .
Measure the resistance from both pump motor control circuits of the BPMV to the housing of the BPMV. Refer to Circuit Testing in Wiring Systems.

Does the resistance measure less than the specified value?

5 ohms

Go to Step 4

Go to Step 5

Inspect for poor connections at the connector of the BPMV. 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 8

Go to Step 6

Inspect for poor connections at the harness connector of the EBCM. 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 8

Go to Step 7