P1691

Brake Vacuum Enhancer Output Open Circuit

P1691 - Brake vacuum enhancer solenoid.: Open circuit or No signal.

Possible causes:
1. Connector MS43 ECM C606, Brake servo unit C1977.
2. Open circuit C606/3 (BS) - C1977/1 (BS).
3. Open circuit C578/5 (YU) - C1977/2 (YU).
4. Engine compartment fusebox Fuse 1.
5. Brake servo vacuum pump unit.
6. MS43 ECM.

1. Connector MS43 ECM C606, Brake servo unit C1977.
CONNECTOR
Check for connector not correctly latched, backed out pins, damaged pins, corroded pins

2. Open circuit C606/3 (BS) - C1977/1 (BS).
OPEN_CIRCUIT
Check resistance > 1M Ohms.

3. Open circuit C578/5 (YU) - C1977/2 (YU).
OPEN_CIRCUIT
Check resistance > 1M Ohms.

4. Engine compartment fusebox Fuse 1.
No detail available for this fault

5. Brake servo vacuum pump unit
No detail available for this fault

6. MS43 ECM.
No detail available for this fault