Pinpoint Tests

Pinpoint tests

PINPOINT TEST G545309p1 : BRAKE VACUUM ASSIST FUNCTION

WARNING: For the following checks, make sure the vehicle is in park and that the parking brake is applied. Failure to follow this instruction may result in personal injury.

G545309t1 : CHECK THE BRAKE PEDAL TRAVEL WITH THE ENGINE OFF
1 Key off.
2 Pump the brake pedal six times and hold firm pressure on the pedal.
- Did the pedal travel decrease and the pedal go hard as it was pumped?

->Yes
GO to Pinpoint Test G545309t2.

->No
CHECK the vacuum circuit to the brake booster. Start the engine and idle for three minutes, switch off then repeat the test. If the pedal travel does not decrease, suspect the brake booster.

G545309t2 : CHECK THE BRAKE PEDAL TRAVEL WITH THE ENGINE RUNNING
1 With firm pressure still held on the brake pedal, start the engine.
- Did the pedal travel increase as the engine started?

->Yes
The vacuum function of the brake booster is operating normally. Check for DTCs indicating a fault elsewhere in the system.

->No
CHECK the vacuum circuit to the brake booster.

PINPOINT TEST G545309p2 : BRAKE SWITCH

G545309t3 : CHECK THE OPERATION OF THE BRAKE SWITCH (PEDAL RELEASED)
1 Key off.
2 Disconnect the brake switch electrical connector, CA142.
3 Ensure the brake pedal is not pressed.
4 Measure the resistance between:
- Brake switch connector CA142, pin 01, component side
- Brake switch connector CA142, pin 04, component side
- Is the resistance greater than 10 ohms?

->Yes
GO to Pinpoint Test G545309t4.

->No
INSTALL a new brake switch. For additional information, refer to Speed Control Deactivator Switch Speed Control Deactivator Switch CLEAR the DTC, test the system for normal operation.

G545309t4 : CHECK THE OPERATION OF THE BRAKE SWITCH (PEDAL PRESSED)
1 Press the brake pedal.
2 Measure the resistance between:
- Brake switch connector CA142, pin 01, component side
- Brake switch connector CA142, pin 04, component side
- Is the resistance greater than 10 ohms?

->Yes
INSTALL a new brake switch. For additional information, refer to Speed Control Deactivator Switch Speed Control Deactivator SwitchCLEAR the DTC, test the system for normal operation.

->No
GO to Pinpoint Test G545309t5.

G545309t5 : CHECK THE POWER SUPPLY TO THE BRAKE PEDAL SWITCH
1 Key on, engine off.
2 Measure the voltage between:
- Brake switch connector CA142, pin 01
- Battery, NEGATIVE terminal
- Is the voltage less than 10 volts?

->Yes
REPAIR the circuit between the brake switch and battery. This circuit includes fuse 8 of the Central Junction Box (CJB). For additional information, refer to the wiring diagrams. CLEAR the DTC, test the system for normal operation.

->No
GO to Pinpoint Test G545309t6.

G545309t6 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT CIRCUIT TO GROUND
1 Key off.
2 Measure the resistance between:
- Brake switch connector CA142, pin 04
- Battery, NEGATIVE terminal
- Is the resistance less than 100K ohms?

->Yes
REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC, test the system for normal operation.

->No
GO to Pinpoint Test G545309t7.

G545309t7 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT CIRCUIT TO POWER
1 Measure the resistance between:
- Brake switch connector CA142, pin 04
- Battery, POSITIVE terminal
- Is the resistance less than 100K ohms?

->Yes
REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC, test the system for normal operation.

->No
GO to Pinpoint Test G545309t8.

G545309t8 : CHECK THE BRAKE SWITCH SIGNAL CIRCUIT FOR HIGH RESISTANCE
1 Disconnect the ECM electrical connector, FL072.
2 Measure the resistance between:
- Brake switch connector CA142, pin 04
- ECM connector FL072, pin 41
- Is the resistance less than 10 ohms?

->Yes
No fault is indicated with the brake switch or circuit. Check the integrity of all connections and TEST the system for normal operation.

->No
REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

PINPOINT TEST G545309p3 : MODULE PUMP SUPPLY AND GROUND

G545309t9 : CHECK THE MODULE PUMP SUPPLY
1 Key off.
2 Disconnect the ABS module connector, FL012.
3 Measure the voltage between:
- ABS module connector FL012, pin 01
- Battery, NEGATIVE terminal
- Is the voltage between 9 and 15 volts?

->Yes
GO to Pinpoint Test G545309t10.

->No
REPAIR the supply circuit as necessary. This circuit includes fuse 20 of the Engine Junction Box. For additional information, refer to the wiring diagrams. Clear the DTC, test the system for normal operation.

G545309t10 : CHECK THE MODULE PUMP GROUND
1 Measure the resistance between:
- ABS module connector FL012, pin 47
- Battery, NEGATIVE terminal
- Is the resistance less than 10 ohms?

->Yes
No fault is indicated with the module pump supply or ground circuits. Check the integrity of all connections and TEST the system for normal operation.

->No
REPAIR the ground circuit as necessary. For additional information, refer to the wiring diagrams. Clear the DTC, test the system for normal operation.