PINPOINT TEST G542816p3 : THROTTLE BODY MOTOR CIRCUIT (VEHICLES WITHOUT SUPERCHARGER)

Pinpoint Tests

CAUTION: When probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part number 3548-1358-00.

NOTE:
- When performing electrical voltage or resistance tests, always use a digital multimeter (DMM) accurate to 3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account.
- Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

PINPOINT TEST G542816p3 : THROTTLE BODY MOTOR CIRCUIT (VEHICLES WITHOUT SUPERCHARGER)

G542816t13 : CHECK THE THROTTLE ACTUATOR CONTROL MOTOR SUPPLY CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Disconnect the throttle body electrical connector, PI303.
2. Measure the resistance between:

Throttle body connector Battery
PI303, harness side
Pin 05 Negative terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC and test the system for normal operation.

-> NO
GO to Pinpoint Test G542816t14.

G542816t14 : CHECK THE THROTTLE ACTUATOR CONTROL MOTOR SUPPLY CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

Throttle body connector Battery
PI303, harness side
Pin 05 Positive terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC and test the system for normal operation.

-> NO
GO to Pinpoint Test G542816t15.

G542816t15 : CHECK THE THROTTLE ACTUATOR CONTROL MOTOR NEGATIVE CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Measure the resistance between:

Throttle body connector Battery
PI303, harness side
Pin 06 Negative terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC and test the system for normal operation.

-> NO
GO to Pinpoint Test G542816t16.

G542816t16 : CHECK THE THROTTLE ACTUATOR CONTROL MOTOR NEGATIVE CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

Throttle body connector Battery
PI303, harness side
Pin 06 Positive terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC and test the system for normal operation.

-> NO
GO to Pinpoint Test G542816t17.

G542816t17 : CHECK THE THROTTLE ACTUATOR CONTROL MOTOR SUPPLY CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the ECM electrical connector, PI300.
2. Measure the resistance between:

Throttle body connector ECM connector PI300,
PI303, harness side harness side
Pin 05 Pin 75

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. CLEAR the DTC and test the system for normal operation.

-> NO
GO to Pinpoint Test G542816t18.

G542816t18 : CHECK THE THROTTLE ACTUATOR CONTROL MOTOR NEGATIVE CIRCUIT FOR HIGH RESISTANCE
1. Measure the resistance between:

Throttle body connector ECM connector PI300,
PI303, harness side harness side
Pin 06 Pin 74

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. CLEAR the DTC and test the system for normal operation.

-> NO
INSTALL a new throttle body assembly. CLEAR the DTC and test the system for normal operation.