For 1990-2009 cars
ABS Components
ABS/TCS Schematics

### Circuit Description

The pump motor is an integral part of the BPMV, while the pump motor relay is integral to the EBTCM. The pump motor relay is not engaged during normal system operation. When ABS or TCS operation is required, the EBTCM activates the pump motor relay and battery power is provided to the pump motor.

### Conditions for Setting the DTC

• | Pump motor voltage is not present 60 milliseconds after activation of the pump motor relay.

• | Pump motor voltage is present for more than 2.5 seconds with no activation of the pump motor relay.

• | Pump motor voltage is not present for at least 40 milliseconds after the pump motor relay is commanded off.

### Action Taken When the DTC Sets

• | A malfunction DTC stores.

• | The ABS/TCS disables.

• | The amber ABS/TCS indicator(s) turn on.

### Conditions for Clearing the DTC

• | The condition responsible for setting the DTC no longer exists and the scan tool Clear DTCs function is used.

• | 100 ignition cycles pass with no DTC(s) detected.

### Diagnostic Aids

• | It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.

• | Thoroughly inspect any circuitry that may be causing the complaint for the following conditions:

- | Backed out terminals

- | Improper mating

- | Broken locks

- | Improperly formed or damaged terminals

- | Poor terminal-to-wiring connections

- | Physical damage to the wiring harness

• | The following conditions may cause an intermittent malfunction:

- | A poor connection

- | Rubbed-through wire insulation

- | A broken wire inside the insulation

• | If an intermittent malfunction exists refer to General Electrical Diagnostic Procedures in Wiring Systems for further diagnosis.

A disconnected pump motor connector will cause this malfunction.

### Test Description

The numbers below refer to step numbers on the diagnostic table.

1. This step checks for a short to ground in CKTs A290 and A291.

2. This step checks for an open in CKTs A290 and A291.

3. This step checks for a mechanical malfunction with the pump motor or the pump. This step also cleans the commutator and brushes of the pump motor prior to the resistance check in step 15.

#### DTC C0110 Pump Motor Circuit Malfunction

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Diagnostic System Check performed? | -- | Go to Step 2 | Go to Diagnostic System Check - ABS
2 | Inspect the 80A Fuse V1 Maxifuse® , in the Power Distribution Fuse Box. Is the fuse OK? | -- | Go to Step 7 | Go to Step 3
3 |

1. Install a new 80A Fuse V1 Maxifuse®.
2. Turn the ignition switch from the OFF to RUN position, engine OFF.
3. Using a scan tool in ABS/TCS Special Functions attempt to run the Automated test.
4. Recheck the 80A Fuse V1 Maxifuse®.

Is the fuse OK?

--

Go to Step 16

Go to Step 4

4 |

1. Turn the Ignition switch to the OFF position.
2. Remove the 80A Fuse V1 Maxifuse®.
3. Disconnect the EBTCM connector C1.
4. Connect the J 39700 Universal Pinout Box using the J 39700-280 cable adapter to the EBTCM harness connector only.
5. Using J 39200 DMM, measure the resistance between terminals 18 and 19 of J 39700 .

Is the resistance within the range specified in the value(s) column?

OL (infinite)

Go to Step 5

Go to Step 12

5 |

1. Disconnect the EBTCM pump motor connector C2.
2. Connect a 10A fused jumper wire between the pump motor connector C2 terminal 2 and battery voltage.
3. Connect a jumper wire between the pump motor connector C2 terminal 1 and ground. Only attempt to run the pump motor for 5 seconds.
4. Disconnect the jumper wires.
5. Inspect the 10A fuse in the jumper wire.

Is the fuse OK?

--

Go to Step 11

Go to Step 6

6 | Replace the BPMV. Refer to Brake Pressure Modulator Valve Replacement . Is the replacement complete? | -- | Go to Step 16 | --
7 |

1. Turn the Ignition switch to the OFF position.
2. Disconnect the EBTCM connector C1.
3. Connect J 39700 Universal Pinout Box using the J 39700-280 cable adaptor to the EBTCM harness connector C1 only.
4. Using J 39200 DMM, measure the resistance between terminals 16 and 19 of J 39700 .

Is the resistance within the range specified in the value(s) column?

0-5 ohms

Go to Step 9

Go to Step 8

8 | Repair CKT F372 for an open or high resistance. Refer to Wiring Repairs in Wiring systems. Is the repair complete? | -- | Go to Step 16 | --
9 |

1. Install the fuse if removed.
2. Using J 39200 DMM, measure the voltage at the 80A Fuse V1 Maxifuse® by probing between the fuse test terminals and a good ground.

Is the voltage within the range specified in the value(s) column?

Battery volts

Go to Step 10

Go to Power Distribution in Wiring Systems

10 | Using J 39200 DMM, measure the voltage at terminal 18 and terminal 17 of J 39700 . Is the voltage within the range specified in the value(s) column at both terminals? | Battery volts | Go to Step 14 | Go to Step 13
11 | Replace EBTCM. Refer to Electronic Brake and Traction Control Module Replacement . Is the replacement complete? | -- | Go to Diagnostic System Check - ABS | --
12 | Repair short to ground in CKT A291 or A290. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | --
13 | Repair open in CKT A291 and A290. Refer to Wiring Repairs. in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | --
14 |

1. Disconnect the EBTCM pump motor connector C2.
2. Connect a 10A fused jumper wire between the pump motor connector C2 terminal 2 and battery voltage.
3. Connect a jumper wire between the pump motor connector C2 terminal 1 and ground. Only attempt to run the pump motor for 5 seconds.
4. Disconnect the jumper wires.
5. Inspect the 10A fuse in the jumper wire.

Is the fuse OK?

--

Go to Step 15

Go to Step 6

15 |

1. Zero the J 39200 DMM leads.
2. Using J 39200 DMM, measure the resistance between terminals 1 and 2 of the pump motor connector C2.

Is the resistance within the range specified in the value(s) column?

0-4 ohms

Go to Step 11

Go to Step 6

16 |

1. Reconnect all previously disconnected components.
2. Using a scan tool clear the DTC.
3. Remove the scan tool from the DLC.
4. Carefully drive the vehicle above 12 Km/h (8 mph) for several minutes.

Does the DTC reset as a current DTC?

--

Go to Step 2

Go to Diagnostic System Check - ABS