Diagnostic Test

WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

1) CHECK FOR A DTC C1038-REAR WHEEL SPEED SENSOR CIRCUIT LOW
NOTE: This DTC must be active for the results of this test to be valid.

Turn the ignition on.

With the scan tool, read and record DTC's.

With the scan tool, erase DTC's.

Cycle the ignition switch from off to on.

With the scan tool, read and record DTC's

Does the scan tool display: C1038-REAR WHEEL SPEED SENSOR CIRCUIT LOW?

Yes
1. Go to 2).
No
1. Refer to ABS-INTERMITTENT CONDITION in DIAGNOSIS AND TESTING.
2. Perform ABS VERIFICATION TEST - VER 1 .
2) CHECK THE TERMINALS/CONNECTORS/TONE WHEEL FOR DAMAGE
NOTE: Check all related wiring for bruised, chafed, pierced or partially broken wires.

NOTE: Check all related connectors for broken, bent, pushed out or corroded terminals.

NOTE: Check the tone wheel teeth for missing teeth, cracks or looseness. Teeth should be perfectly square, not bent or nicked.

Turn the ignition off.

Visually inspect the ABM harness connector, Right Rear WSS, Right Rear WSS harness connector, and Right Rear WSS tone wheel (if applicable) for damage.

Were any problems found?

Yes
1. Repair as necessary.
2. Perform ABS VERIFICATION TEST - VER 1 .
No
1. Go to 3).
3) CHECK THE (B1) RIGHT REAR WSS SIGNAL AND THE (B2) RIGHT REAR WSS SUPPLY CIRCUITS FOR A SHORT TOGETHER

Fig 1: Checking Right Rear WSS Signal Circuit For A Short To Right Rear WSS 12-VOLT Supply Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the ABM harness connector.

Disconnect the Right Rear WSS harness connector.

Measure the resistance between the (B1) Right Rear WSS Signal and the (B2) Right Rear WSS Supply circuits at the Right Rear WSS harness connector.

Is the resistance above 5.0 ohms?

Yes
1. Go to 4).
No
1. Repair the (B1) Right Rear WSS Signal and the (B2) Right Rear WSS Supply circuits for a short together.
2. Perform ABS VERIFICATION TEST - VER 1 .
4) CHECK THE VOLTAGE ON THE (B2) RIGHT REAR WSS SUPPLY CIRCUIT

Fig 2: Checking Right Rear WSS 12-Volt Supply Circuit Voltage
Courtesy of CHRYSLER LLC

Reconnect the ABM harness connector.

Turn the ignition on.

Measure the voltage of the (B2) Right Rear WSS Supply circuit in the Right Rear WSS harness connector.

Is the voltage above 10 volts?

Yes
1. Go to 7).
No
1. Go to 5).
5) CHECK THE (B2) RIGHT REAR WSS SUPPLY CIRCUIT FOR A SHORT TO GROUND

Fig 3: Checking Right Rear WSS 12-Volt Supply Circuit For A Short To Ground
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the ABM harness connector.

Using a 12-volt test light connected to 12-volts, check the (B2) Right Rear WSS Supply circuit.

Does the test light illuminate brightly?

Yes
1. Repair the (B2) Right Rear WSS Supply circuit for a short to ground.
2. Perform ABS VERIFICATION TEST - VER 1 .
No
1. Go to 6).
6) CHECK THE (B2) RIGHT REAR WSS SUPPLY CIRCUIT FOR AN OPEN

Fig 4: Checking Right Rear WSS 12-Volt Supply Circuit For Open
Courtesy of CHRYSLER LLC

Connect a jumper wire between the (B2) Right Rear WSS Supply circuit and ground.

Using a 12-volt test light connected to 12-volts, check the (B2) Right Rear WSS Supply circuit.

Does the test light illuminate brightly

Yes
1. Replace the ABM in accordance with the Service Information.
2. Perform ABS VERIFICATION TEST - VER 1 .
No
1. Repair the (B2) Right Rear WSS Supply circuit for an open.
2. Perform ABS VERIFICATION TEST - VER 1 .
7) CHECK THE (B2) RIGHT REAR WSS SUPPLY AND THE (B1) RIGHT REAR WSS SIGNAL VOLTAGE

Fig 5: Checking Right Rear WSS Supply & Right Rear WSS Signal Voltage
Courtesy of CHRYSLER LLC

Measure the voltage between the (B2) Right Rear WSS Supply and (B1) Right Rear WSS Signal circuits at the Right Rear WSS harness connector.

Is the voltage above 10 volts?

Yes
1. Go to 10).
No
1. Go to 8).
8) CHECK THE (B1) RIGHT REAR WSS SIGNAL CIRCUIT FOR A SHORT TO GROUND

Fig 6: Checking (B1) Right Rear WSS Signal Circuit For Short To Ground
Courtesy of CHRYSLER LLC

Turn the ignition off.

Using a 12-volt test light connected to 12-volts, check the (B1) Right Rear WSS Signal circuit.

Does the test light illuminate brightly?

Yes
1. Repair the (B1) Right Rear WSS Signal circuit for a short to ground.
2. Perform ABS VERIFICATION TEST - VER 1 .
No
1. Go to 9).
9) CHECK THE (B1) RIGHT REAR WSS SIGNAL VOLTAGE AT THE RIGHT REAR WSS HARNESS CONNECTOR

Fig 7: Checking Right Rear WSS Signal Voltage At Right Rear WSS Harness Connector
Courtesy of CHRYSLER LLC

Turn the ignition off.

Reconnect all connectors.

Turn the ignition on.

While back probing, measure between the (B1) Right Rear WSS Signal circuit and chassis ground at the Right Rear WSS harness connector.

Slowly rotate the wheel by hand.

Did the (B1) Right Rear WSS Signal circuit voltage toggle between approximately 1.6 to 0.8 volts?

Yes
1. Go to 10).
No
1. Replace the Right Rear WSS in accordance with the Service Information.
2. Perform ABS VERIFICATION TEST - VER 1 .
10) CHECK THE (B1) RIGHT REAR WSS SIGNAL VOLTAGE AT THE ABM HARNESS CONNECTOR

Fig 8: Checking Right Rear WSS Signal Voltage At ABM Harness Connector
Courtesy of CHRYSLER LLC

Turn the ignition on.

While back probing, measure between the (B1) Right Rear WSS Signal circuit and chassis ground at the ABM harness connector.

Slowly rotate the wheel by hand.

Did the (B1) Right Rear WSS Signal circuit voltage toggle between approximately 1.6 to 0.8 volts?

Yes
1. Replace the ABM in accordance with the Service Information.
2. Perform ABS VERIFICATION TEST - VER 1 .
No
1. Repair the (B1) Right Rear WSS Signal circuit for an open.
2. Perform ABS VERIFICATION TEST - VER 1 .