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Matt Hardy
Matt Hardy, ASE Certified Technician
Category: Chrysler
Satisfied Customers: 919
Experience:  ASE Master Auto Tech, ASE L1, Jeep/Chrysler Dealer Tech, 18 yrs exp
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2001 Town & Country mini van - ABS light on Code is Hydraulic

Customer Question

2001 Town & Country mini van - ABS light on
Code is Hydraulic pump circuit malfunction
Scan tool says Pump voltage 0
Any common problems ?
Submitted: 4 years ago.
Category: Chrysler
Expert:  brownjeff replied 4 years ago.
Can you send me the vin# XXXXX I can check for bulletins?
Customer: replied 4 years ago.
1c4gp443x1b226512
Expert:  brownjeff replied 4 years ago.
Do not see any commone problems. Do you have the code number by chance?
Customer: replied 4 years ago.
no code right now my scan tool just says hydr. pump circuit malfunction and under data says pump voltage 0
Expert:  brownjeff replied 4 years ago.
All the fuses are good?
Customer: replied 4 years ago.
fuses are all good
Customer: replied 4 years ago.
Fuses are Good
Expert:  brownjeff replied 4 years ago.

Have you checked to see if getting power to the pump?

Customer: replied 4 years ago.
If you can tell me which wire is power i will go out and check that
Expert:  brownjeff replied 4 years ago.

Number 2

 

 

 

Customer: replied 4 years ago.

If it is the 2 wire connector that is hard wired into the abs pump ( on one end )

then no is cant get power with the key forward , and even tried running vehicle.

Should their be constant power ? What if i jumped power to the positive side to see if the light goes out ?

Expert:  brownjeff replied 4 years ago.
There should be power at this terminal, but I do not haveenough information to help you finish the diagnosis so I will send your information to another expert for help.
Expert:  Matt Hardy replied 4 years ago.

The most likely cause for 'pump circuit malfunction' is a fault in the ABS control module. The module is the black box attached to the hydraulic control unit.

 

The ABS control module gives power and ground to the pump motor.

Customer: replied 4 years ago.
I have 2 contacts with power at the big plug. Should i have power at the female end of the other plug with just the key in the on position ?
Expert:  Matt Hardy replied 4 years ago.

Symptom:

PUMP CIRCUIT FAILURE

When Monitored and Set Condition:

PUMP CIRCUIT FAILURE

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 brake is applied, 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 without sufficient voltage to operate it.

POSSIBLE CAUSES

PUMP HARNESS DISCONNECTED

CAB - PUMP MOTOR RUNNING CONTINUOUSLY

ABS PUMP MOTOR INTERMITTENT DTC

GROUND CIRCUIT HIGH RESISTANCE

FUSED B(+) CIRCUIT OPEN

GROUND CIRCUIT OPEN

CAB - INTERNAL FAULT

CAB - SETTING FALSE CODE

TEST ACTION APPLICABILITY

1 Turn the ignition off.

Turn the ignition on.

Monitor the pump motor for continuous operation.

Is the pump motor running continuously?

All

Yes ® Replace the Controller Anti-Lock Brake in accordance with the

Service Information. The vehicle must be driven at 25 km/h (15

mph) to extinguish the ABS indicator.

Perform ABS VERIFICATION TEST - VER 1.

No ® Go To 2

2 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

Yes ® Go To 3

No ® Go To 4

21

BRAKES (CAB)

TEST ACTION APPLICABILITY

3 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. The vehicle must be driven at 25 km/h (15

mph) to extinguish the ABS indicator.

Perform ABS VERIFICATION TEST - VER 1.

No ® Replace the Controller Anti-Lock Brake in accordance with the

Service Information. The vehicle must be driven at 25 km/h (15

mph) to extinguish the ABS indicator.

Perform ABS VERIFICATION TEST - VER 1.

4 Check the short Wiring Harness between the ABS Pump and the CAB.

Check for disconnect and damage.

Is the harness disconnected or damaged?

All

Yes ® Reconnect or repair the Pump Harness as necessary.

Perform ABS VERIFICATION TEST - VER 1.

No ® Go To 5

5 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 ohm?

All

Yes ® Go To 6

No ® Repair the ground circuit for an open. The vehicle must be driven

at 25 km/h (15 mph) to extinguish the ABS indicator.

Perform ABS VERIFICATION TEST - VER 1.

6 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 7

No ® Repair the Ground circuit for high resistance. The vehicle must be

driven at 25 km/h (15 mph) to extinguish the ABS indicator.

Perform ABS VERIFICATION TEST - VER 1.

22

BRAKES (CAB)

PUMP CIRCUIT FAILURE - Continued

TEST ACTION APPLICABILITY

7 Turn the ignition off.

Disconnect the CAB connector.

Note: Check connector - Clean/repair as necessary.

Turn the ignition on.

Using a 12-volt test light connected to ground, check the Pump Motor Fused B+

circuit.

Does the test light illuminate brightly?

All

Yes ® Go To 8

No ® Repair the Fused B(+) circuit for an open. The vehicle must be

driven at 25 km/h (15 mph) to extinguish the ABS indicator.

Perform ABS VERIFICATION TEST - VER 1.

8 If there are no possible causes remaining, view repair. All

Repair

Replace the Controller Anti-Lock Brake in accordance with the

Service Information. The vehicle must be driven at 25 km/h (15

mph) to extinguish the ABS indicator.

Expert:  Matt Hardy replied 4 years ago.

graphic

Expert:  Matt Hardy replied 4 years ago.
graphic

Edited by Matt Hardy on 11/18/2009 at 12:24 AM EST
Expert:  Matt Hardy replied 4 years ago.
1Z107 12BK/DGGROUND
2B1 18DG/ORRIGHT REAR WHEEL SPEED SENSOR 12 VOLT SUPPLY
3B2 18DG/LBRIGHT REAR WHEEL SPEED SENSOR SIGNAL
4--
5D25 18WT/VTPCI BUS
6B6 18DG/WTRIGHT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY
7B7 18DG/VTRIGHT FRONT WHEEL SPEED SENSOR SIGNAL
8--
9A111 12DG/RDFUSED B(+)
10F500 18DG/PKFUSED IGNITION SWITCH OUTPUT
11--
12--
13--
14--
15--
16Z127 12BK/DGGROUND
17--
18L50 18WT/TNBRAKE LAMP SWITCH OUTPUT
19B3 18DG/YLLEFT REAR WHEEL SPEED SENSOR 12 VOLT SUPPLY
20B4 18DG/GYLEFT REAR WHEEL SPEED SENSOR SIGNAL
21--
22B8 18DG/TNLEFT FRONT WHEEL SPEED SENSOR 12 VOLT SUPPLY
23B9 18DG/LGLEFT FRONT WHEEL SPEED SENSOR SIGNAL
24A107 12TN/RDFUSED B(+)
Expert:  Matt Hardy replied 4 years ago.

PUMP MOTOR CONNECTOR - 2 WAY

CAVCIRCUITFUNCTION
1TNGROUND
2RDPUMP/MOTOR RELAY OUTPUT
Expert:  Matt Hardy replied 4 years ago.

Hi!

See the above posts for information.

Check all the powers and grounds with a test light.

A scan tool is necessary to actuate the pump motor.

 

Let me know if you have any more questions.

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