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abs hydraulic circuit malfunction
I got a code "9 hydraulic pump circuit malfunction" Any ideas on what to look at for this.
Its a 02 grand caravan. Thanks in advance. |
PUMP CIRCUIT FAILURE When Monitored: Ignition on. The CAB commands the pump on at 20 km/h (12 mph) to seconds. 3) Pump is turned on by the CAB, but without sufficient voltage to operate it.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 I've seen the harness rub through and get corroded down by the hydraulic unit bracket. |
Check wiring loom, especially on all the connectors from Fuse Box to ABS unit. Most of the time is one of the connectors corroded off.
If nothing found visually, you HAVE to check for power and ground at the ABS pump before u condemn the ABS unit. 75% of the time this is a Wiring problem instead of the ABS unit failure. Mainly pay attention under the Fuse box. The wiring loom runs under the Battery, and you have to remove the battery and battery tray to gain access to check the ABS unit. I recommend you to remove battery, put it aside, and use a remote jump cable to power vehicle for testing. Of course, check for blown/missing fuse. |
if nothing visual found, you HAVE to run the diagnostic tree for the code. The Pump cost $400 + 3 hrs of labors.
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 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. Make sure the Pump Motor connecter is secure. 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 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 6 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. 6 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 7 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. 44 BRAKES (CAB) PUMP CIRCUIT FAILURE — Continued TEST ACTION APPLICABILITY 7 Make sure the Pump Motor connector is secure. Turn the ignition on. With the DRBIII t, 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 8 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.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. |
Thanks. Well, looks like I got some work to do.
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