C101B

PINPOINT TEST 18: DTC C101A:1C, 62, 64 OR C101B:1C

Normal Operation

The vacuum pressure sensor produces 2 signals used by the ABS module to check the integrity of the vacuum lines, hoses and fittings, and to measure the performance of the brake vacuum pump and brake booster. The ABS module provides a 5-volt reference voltage to the vacuum pressure sensor along circuit (Y/O). Vacuum pressure sensor signal A is provided to the ABS module along circuit (BR/V). Vacuum pressure sensor signal B is provided to the ABS module along circuit (L/G). The ABS module provides a signal return to the vacuum pressure sensor along circuit (W/L). The vacuum pressure sensor is internal to the brake booster. If a new vacuum pressure sensor is needed, a new brake booster must be installed.

C101A:1C-C101B:1C:

Possible Causes
- Wiring, terminals or connectors
- Vacuum pressure sensor
- ABS module

Diagnostic Procedure

CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

Step 1-Step 5:

Step 6-Step 9:

Step 10-Step 12:

Step 13: