PINPOINT TEST G528708p2 : CHECK THE SECONDARY AIR INJECTION PUMP CIRCUITS

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 G528708p2 : CHECK THE SECONDARY AIR INJECTION PUMP CIRCUITS

G528708t5 : CHECK THE SECONDARY AIR INJECTION PUMP RELAY SUPPLY VOLTAGES
1. Key off.
2. Remove the secondary air injection pump relay.
3. Measure the voltage between:

Secondary air injection Battery
relay base
Pin 01
Negative terminal
Pin 03

- Is the voltage less than 10 volts?

-> YES
REPAIR the circuit between the relay base and battery. This circuit includes in-line (fuse 2) and the mega fuses. CLEAR the DTC and test the system for normal operation.

-> NO
GO to Pinpoint Test G528708t10.

G528708t10 : CHECK THE SECONDARY AIR INJECTION RELAY TO PUMP SUPPLY CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Disconnect the secondary air injection pump electrical connector, EC93.
2. Measure the resistance between:

Secondary air injection Battery
relay base
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 G528708t11.

G528708t11 : CHECK THE SECONDARY AIR INJECTION RELAY TO PUMP SUPPLY CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

Secondary air injection Battery
relay base
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 G528708t6.

G528708t6 : CHECK THE SECONDARY AIR INJECTION PUMP SIGNAL CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Measure the resistance between:

Secondary air injection Battery
relay base
Pin 02 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 G528708t7.

G528708t7 : CHECK THE SECONDARY AIR INJECTION PUMP SIGNAL CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

Secondary air injection Battery
relay base
Pin 02 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 G528708t12.

G528708t12 : CHECK THE SECONDARY AIR INJECTION RELAY TO PUMP SUPPLY CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the secondary air pump connector, EC93.
2. Measure the resistance between:

Secondary air injection Secondary air pump
relay base connector, EC93
Pin 05 Pin 02

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 G528708t13.

G528708t13 : CHECK THE SECONDARY AIR INJECTION PUMP GROUND CIRCUIT FOR HIGH RESISTANCE
1. Measure the resistance between:

Secondary air pump Battery
connector, EC93
Pin 01 Negative terminal

- 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 G528708t8.

G528708t8 : CHECK THE SECONDARY AIR INJECTION PUMP SIGNAL CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the ECM electrical connector, EC300.
2. Measure the resistance between:

Secondary air injection ECM connector, EC300
relay base
Pin 02 Pin 50

- 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 secondary air injection pump relay. CLEAR the DTC and test the system for normal operation.