2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1341

2010 Cadillac Truck SRX AWD V6-2.8L Turbo Page 1341

Control Systems/Specifications/Altitude Versus Barometric Pressure) table. The BARO should be within the specified range displayed in the

table for the specific altitude.

瀚慖f not within the specified range, refer to DTC P2227, P2228, or P2229 (LAU) (See: P Code Charts/P2227) for further diagnosis.

4. Ignition ON, command the Secondary Air Injection Pump Relay ON and OFF with a scan tool. The secondary air injection pump should turn

ON and OFF.

5. Engine running, command the Secondary Air Injection Pump Relay ON with a scan tool while observing the Secondary Air Injection

Pressure Sensor parameter. The reading should change greater than 10 kPa (1.45 psi).

6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the

conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Inspect the secondary air injection system for the following conditions:

* Hoses/pipes for a restriction or blockage

* Hoses/pipes for being disconnected

* Plugged secondary air injection pressure sensor port

* Damaged secondary air injection check valve

瀚慖f a condition is located, repair as necessary.

瀚慖f a condition is not located and the secondary air injection pump operates with no pressure change, replace the G21 secondary air

injection pump.

2. Ignition OFF, remove the KR25 secondary air injection pump relay.

3. Ignition ON, verify that a test lamp does not illuminate between the controlled output circuit terminal 30 and ground.

瀚慖f the test lamp illuminates, test the controlled output circuit for a short to voltage.

4. Verify that a test lamp illuminates between the secondary air injection pump relay switch B+ circuit terminal 87 and ground.

瀚慖f the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and

the relay coil ignition circuit fuse is open, test all components connected to the ignition circuit and replace as necessary.

5. Connect a 20 A fused jumper wire between the secondary air injection pump relay switch B+ circuit terminal 87 and the controlled output

circuit terminal 30. The G21 secondary air injection pump should turn ON.

瀚慖f the secondary air injection pump does not activate, test the controlled output circuit and the secondary air injection pump ground circuit

for an open/high resistance. If the circuits test normal, test or replace the G21 secondary air injection pump.

6. If all circuits test normal, replace the KR25 secondary air injection pump relay.

Component Testing

1. Ignition OFF, disconnect the KR25 secondary air injection pump relay.

2. Test for 70-110 ohm between terminals 85 and 86.

瀚慖f the resistance is not within the specified range, replace the KR25 secondary air injection pump relay.

3. Test for infinite resistance between the following terminals:

* 86 and 87

* 86 and 30

* 85 and 87

* 87 and 30

瀚慖f not the specified value, replace the KR25 secondary air injection pump relay.

4. Install a 20 A fused jumper wire between relay terminal 86 and 12 V. Install a jumper wire between relay terminal 85 and ground. Test for

less than 2 ohm between terminals 87 and 30.

瀚慖f greater than the specified range, replace the KR25 secondary air injection pump relay.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Relay Replacement (Attached to Wire Harness) (See: Power and Ground Distribution/Power Distribution Relay/Service and Repair/Relay

Replacement (Attached to Wire Harness))Relay Replacement (Within an Electrical Center) (See: Power and Ground Distribution/Power