Dodge Nitro. Manual — part 179

When the ABS Pump Motor is activated.

Set Condition:

The ABM detects low pump motor feedback voltage with actuation of the pump motor relay.

Diagnostic Test

1) CHECK FOR A DTC C1073-ABS PUMP MOTOR CONTROL CIRCUIT

Turn the ignition on.

With the scan tool, record and erase DTCs.

Cycle the ignition switch from off to on.

Road test the vehicle over 40 km/h (25 mph).

With the scan tool, read DTCs

Does the scan tool display: C1073-ABS PUMP MOTOR CONTROL CIRCUIT?

Yes

Go to 2).

No

Refer to the ABS INTERMITTENT CONDITION.

2) INSPECT RELATED WIRING HARNESS, TERMINALS, & CONNECTORS

Possible Causes

BLOWN PUMP FUSE
WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE
HIGH RESISTANCE IN B+ CIRCUITS
HIGH RESISTANCE IN GROUND CIRCUITS
INTEGRATED CONTROL UNIT

NOTE:

This DTC must be active for the results of this test to be valid.

NOTE:

Vehicle must be driven above 40 km/h (25 mph) for set conditions to be
met.

NOTE:

The Anti-Lock Brake Module must sense ALL 4 wheels at 12 km/h (7.5
mph) before it will extinguish the ABS indicators.

2007 Dodge Nitro R/T

2007 BRAKES ABS - Electrical Diagnostics - Nitro

Turn the ignition off.

Visually inspect the related wiring harness. Look for any pinched, chafed, pierced, and partially broken
wires.

Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, and corroded
terminals.

Were any problems found?

Yes

Repair as necessary.

Perform ABS VERIFICATION TEST.

No

Go to 3).

3) CHECK THE ABS PUMP MOTOR FUSED B+ FOR AN OPEN

Turn the ignition off.

Remove and visually inspect the ABS Pump Motor B+ fuse.

Is the ABS Pump Motor B+ fuse open?

Yes

Go to 4).

No

Go to 6).

4) CHECK THE (A107) FUSED B(+) FOR A SHORT TO GROUND

2007 Dodge Nitro R/T

2007 BRAKES ABS - Electrical Diagnostics - Nitro

Fig. 38: Probing (A107) Fused B+ Circuit
Courtesy of CHRYSLER LLC

Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Using a 12-volt test light connected to 12-volts, probe the (A107) Fused B+ circuit.

Does the test light illuminate brightly?

Yes

2007 Dodge Nitro R/T

2007 BRAKES ABS - Electrical Diagnostics - Nitro

Repair the (A107) Fused B(+) circuit for a short to ground.

Perform ABS VERIFICATION TEST.

No

Go to 5).

5) CHECK THE (A107) FUSED B(+) CIRCUIT

Turn the ignition off.

Visually inspect the (A107) Fused B(+) circuit in the wiring harness.

Look for any signs of intermittent short to ground.

Is the wiring harness OK?

Yes

Go to 6).

No

Repair the (A107) Fused B(+) circuit for a short to ground.

Perform ABS VERIFICATION TEST.

6) CHECK THE VOLTAGE ON THE (A107) FUSED B(+) CIRCUIT

Turn the ignition off.

Disconnect the Anti-Lock Brake Module harness connector.

Measure the voltage of the (A107) Fused B(+) circuit in the Anti-Lock Brake Module harness connector.

Is the voltage above 10 volts?

Yes

Go to 7).

No

Repair the (A107) Fused B(+) circuit for an open.

Perform ABS VERIFICATION TEST.

7) CHECK THE (Z909) GROUND CIRCUIT FOR AN OPEN

Measure the resistance of the (Z909) Ground circuit between the Anti-Lock Brake Module harness

2007 Dodge Nitro R/T

2007 BRAKES ABS - Electrical Diagnostics - Nitro