Can you supply informations on Jeep Cherokee classic 2001 P030 code ABS Motor circuit not working properly?

Answer 1

Symptom:

PUMP MOTOR NOT WORKING PROPERLY

When Monitored and Set Condition:

PUMP MOTOR NOT WORKING PROPERLY

When Monitored: Ignition on. The CAB commands the pump on at 20 km/h (12 mph) to

check its operation, if the brake switch is not applied. If the driver has their foot on the

brake, the test will run at 40 km/h (25 mph). The CAB monitors pump voltage every 7

milliseconds.

Set Condition: The DTC is stored when the CAB detects: 1) Improper voltage decay after

the pump was turned off. 2) Pump not energized by the CAB, but voltage is present for 3.5

seconds. 3) Pump is turned on by the CAB, but their is insufficient voltage to operate it.

POSSIBLE CAUSES

ABS PUMP MOTOR INTERMITENT DTC

FUSED B(+) CIRCUIT INTERMITTENTLY SHORTED TO GROUND

FUSED B(+) CIRCUIT SHORTED TO GROUND

CAB - FUSED B(+) CIRCUIT SHORTED TO GROUND

FUSE BLOWN - PUMP MOTOR CIRCUIT

NO B+ SUPPLY TO FUSE

ABS PUMP MOTOR INOPERATIVE

FUSED B(+) CIRCUIT OPEN

GROUND CIRCUIT OPEN

GROUND CIRCUIT HIGH RESISTANCE

CAB - INTERNAL FAULT

TEST ACTION APPLICABILITY

1 Turn the ignition on.

With the DRBIIIt, read DTC's.

With the DRBIIIt, erase DTC's.

Turn the ignition off.

Turn the ignition on.

With the DRBIIIt, actuate the ABS pump motor.

Did the Pump Motor operate when actuated?

All

No ® Go To 2

Yes ® Go To 13

2 Turn the ignition off.

Remove and inspect the ABS Pump fuse in the PDC.

Is the Fuse blown?

All

Yes ® Go To 3

No ® Go To 7

33

BRAKES (CAB)

TEST ACTION APPLICABILITY

3 Turn the ignition off.

Visually inspect the Fused B(+) Circuit in the wiring harness from the PDC to the

CAB. Look for any sign of an Intermittent Short to Ground.

Is the wiring harness OK?

All

Yes ® Go To 4

No ® Repair the Fused B(+) Circuit shorted to ground.

Perform ABS VERIFICATION TEST - VER 1.

4 Turn the ignition off.

Disconnect the ABS PUMP Fuse # 12 from the Power Distribution Center (PDC).

Disconnect the CAB connector.

Note: Check connector - Clean/repair as necessary.

Using a test light connected to 12 volts, probe the Fused B (+) Circuit.

Is the test light on?

All

Yes ® Repair the Fused B(+) circuit short to ground.

Perform ABS VERIFICATION TEST - VER 1.

No ® Go To 5

5 Turn the ignition off.

Disconnect the ABS PUMP Fuse 12 from the PDC.

The CAB must be connected for the results of this test to be valid.

Using a test light connected to 12 volts, probe the Fused B (+) circuit in the PDC.

Is the test light on?

All

Yes ® Replace the CAB.

Perform ABS VERIFICATION TEST - VER 1.

No ® Go To 6

6 Turn the ignition off.

If there are no potential causes remaining, replace the Fuse.

View repair options

All

Repair

Replace the ABS Pump Motor Fuse.

Perform ABS VERIFICATION TEST - VER 1.

7 Turn the ignition on.

Using a 12-volt test light connected to ground, check the B+ supply to Fuse 12 in the

PDC.

Is the B+ supply OK?

All

Yes ® Go To 8

No ® Repair the B+ supply for an open.

Perform ABS VERIFICATION TEST - VER 1.

34

BRAKES (CAB)

PUMP MOTOR NOT WORKING PROPERLY - Continued

TEST ACTION APPLICABILITY

8 Turn the ignition off.

Disconnect Pump Motor Connector.

Connect a 10 gauge jumper wire between pump motor Fused B (+) circuit and a 40

Amp Fused B (+) circuit.

Connect a 10 gauge jumper wire between pump motor ground circuit and a known

good body ground.

Monitor Pump Motor operation.

Is the pump motor running?

All

Yes ® Go To 9

No ® Replace the ABS Pump Motor/Hydraulic Control Unit assembly.

Perform ABS VERIFICATION TEST - VER 1.

9 Turn the ignition off.

Remove the ABS PUMP Fuse #12 from the Power Distribution Center (PDC).

Disconnect the CAB connector.

Note: Check connector - Clean/repair as necessary.

Measure the resistance of the Fused B (+) circuit between the PDC Fuse Terminal

and the CAB connector.

Is the resistance below 10 ohms?

All

Yes ® Go To 10

No ® Repair the Fused B(+) circuit for an open.

Perform ABS VERIFICATION TEST - VER 1.

10 Turn the ignition off.

Disconnect CAB Connector.

Note: Check connector - Clean/repair as necessary.

Measure the resistance of the CAB ground circuits.

Is the resistance below 1.0 ohms?

All

Yes ® Go To 11

No ® Repair the ground circuit circuit for an open.

Perform ABS VERIFICATION TEST - VER 1.

11 Turn the ignition on.

With the DRBIIIt, enable pump motor actuation.

NOTE: Pump motor will not operate, but voltage will be applied.

Measure the voltage drop across theABS ground circuit connection, with pump motor

actuation enabled.

Is the voltage below 0.1 volt?

All

Yes ® Go To 12

No ® Repair the Ground circuit for an open.

Perform ABS VERIFICATION TEST - VER 1.

12 If there are no potential causes remaining, view repair. All

Repair

Replace the Controller Anti-Lock Brake in accordance with the

Service Information.

Perform ABS VERIFICATION TEST - VER 1.

35

BRAKES (CAB)

PUMP MOTOR NOT WORKING PROPERLY - Continued

TEST ACTION APPLICABILITY

13 Turn the ignition off.

Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or

partially broken wires.

Visually inspect the related wire harness connectors. Look for broken, bent, pushed

out, or corroded terminals.

Refer to any Hotline letters or Technical Service Bulletins that may apply.

Were any problems found?

All

Yes ® Repair as necessary.

Perform ABS VERIFICATION TEST - VER 1.

No ® Test Complete.

36

BRAKES (CAB)

PUMP MOTOR NOT WORKING PROPERLY - Co