DTC 83

DTC 83 Low Brake Fluid






Circuit Description

The IPC outputs 5 volts on CKT 209 to the brake fluid level sensor. The IPC determines the level of brake fluid by the voltage drop it detects across the sensor circuit. This information is delivered to the EBTCM via the serial data line.

DTC will set when

DTC 83 will set if the brake fluid level falls below an acceptable level, or the fluid level sensor becomes damaged or disconnected. It will also set with an open, short to ground or a short to power on CKT 209.

Action Taken

1. Code set.
2. TCS switched "OFF".
3. "BRAKE" warning lamp ON.
4. "TRACTION DISABLED" message ON.

Test Description

Test numbers refer to circled numbers on the diagnostic chart.

1. Check the brake fluid level in master cylinder reservoir.
2. Check brake fluid level as detected by IPC.
3. Brake fluid level not acceptable. Fill and check if DTC 83 resets.
4. A, B, and C. Brake fluid level as detected by IPC. See "DIAGNOSTIC AIDS".
5. Checks IPC input parameter ID80 with sensor disconnected for a short to ground in CKT 209, or bad sensor.
6. Checks IPC input parameter ID80 with sensor disconnected and connector shorted, which should show 0 V
7. IPC detects acceptable brake fluid level. Problem not present.
8. Checks sensor resistor and checks for a short between CKT's 209 and 51.
9. Checks for open in CKT's 209 and 51.

Diagnostic Aids

IPC data parameter ID80 will display the following:
- 3.6-5V - open in sensor circuit.
- 1.5-3.5V - circuit OK. Problem not present.
- 0-1.4V - short between CKT's 209 and 51. Refer to Computer and Controls for operation of self diagnostic system.