DTC C1297 Accelerometer Circuit Shorted to Ground. Pontiac Sun Runner - 4WD (Canada) 1998

For 1990-2009 cars
ABS Components
Antilock Brake System Schematics

### Circuit Description

The EBCM provides power (5 volts) and ground to the accelerometer through CKT 9Q01 and CKT 9R01 respectively. The accelerometer converts the change in vehicle motion, or inertia, into a voltage signal. This signal is sent to the EBCM through CKT 9S01.

The accelerometer provides additional vehicle speed reference to the EBCM. The voltage signal ranges, from 2.4 to 2.6 volts at zero speed change (constant motion.) The accelerometer voltage signal drops when the vehicle is under acceleration. The accelerometer voltage signal increases when the vehicle is under deceleration.

### Conditions for Setting the DTC

• | DTC C1297 can set anytime after initialization is completed.

• | A malfunction exists if the EBCM detects a short to ground in the accelerometer power circuit (CKT 9Q01), or a short to ground in the accelerometer signal circuit (CKT 9S01).

### Action Taken When the DTC Sets

• | A malfunction DTC stores.

• | The ABS disables.

• | The ABS warning indicator turns ON.

• | If failure occurs during an ABS event, ABS is disabled after the completion of the ABS event.

### 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 drive cycles pass with no DTCs detected. A drive cycle consists of starting the vehicle, driving the vehicle over 16 km/h (10 mph), stopping and then turning the ignition off.

### Diagnostic Aids

Use the enhanced diagnostic function of the Scan Tool in order to measure the frequency of the malfunction.

Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for improper mating, improperly formed or damaged terminals, poor terminal to wiring connections, or physical damage to the wiring harness.

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 | Was the Diagnostic System Check performed? | -- | Go to Step 2 | Go to Diagnostic System Check

2

1. Turn the ignition switch ON.

Do not start the engine.

2. Use the Scan Tool in order to inspect for DTCs.

Is this DTC set as current ?

--

Go to Step 3

Go to Step 7

3

1. Turn the ignition switch to LOCK.
2. Disconnect the EBCM connector C1.
3. Disconnect the accelerometer electrical connector.
4. Using J 39200 , measure the resistance between the EBCM harness connector C1 terminal C2 and ground.

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

OL

(Infinite)

Go to Step 4

Go to Step 8

4 | Using J 39200 , measure the resistance between the EBCM harness connector C1 terminal D2 and ground. Is the resistance measured within the range specified in the Value(s) column? | OL (Infinite) | Go to Step 5 | Go to Step 9

5

1. Reconnect the EBCM connector C1 and the accelerometer connector.
2. Turn the ignition switch to ON.
3. Using the Scan Tool , select Data Display and monitor accelerometer voltage.

Is the accelerometer voltage output approximately 2.5 volts (vehicle not in motion).

--

Go to Step 6

Go to Step 10

6

1. Using the Scan Tool , clear DTCs.
2. Turn the ignition switch to LOCK.
3. Turn the ignition switch to ON.
4. Using the Scan Tool , check for DTCs.

Does this DTC reset as current?

--

Go to Step 11

Go to Step 12

7

1. Using the Scan Tool , clear DTCs.
2. Turn the ignition switch to LOCK.
3. Drive vehicle to 10 km/h (6 mph) for 10 seconds.
4. Stop vehicle.
5. Repeat drive cycle (steps 2-5 above).
6. Using the Scan Tool , check for DTCs.

Does this DTC reset as current or history during these drive cycles?

--

Go to Step 3

Go to Step 12

8 | Repair the short to ground in CKT 9S01. Is the repair complete? | -- | Go to Diagnostic System Check | --
9 | Repair the short to ground in CKT 9Q01. Is the repair complete? | -- | Go to Diagnostic System Check | --
10 | Replace the accelerometer. Refer to Lateral Accelerometer Replacement . Is the repair complete? | -- | Go to Diagnostic System Check | --
11 | Replace the EBCM. Refer to Electronic Brake Control Module Replacement . Is the repair complete? | -- | Go to Diagnostic System Check | --
12 | Malfunction not present at this time. Refer to Diagnostic Aids for additional information regarding this DTC. Is the action complete? | -- | System OK | --