Circuit/System Testing

Secondary Air Injection Solenoid Valve Malfunction

1. Ignition OFF, disconnect the KR26 secondary air injection solenoid valve relay.
2. Verify a test lamp illuminates between the B+ circuit terminal 30 and ground.
   • If the test lamp does not illuminate and the circuit fuse is good 
   1. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
   • If the test lamp does not illuminate and the circuit fuse is open 
   1. Ignition OFF
   2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
   3. Disconnect the harness connector at the Q29 secondary air injection solenoid valve.
   4. Test for infinite resistance between the control circuit terminal 5 and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
   5. Test or replace the Q29 secondary air injection solenoid valve.
   • If the test lamp illuminates 
3. Disconnect the harness connector at the Q29 secondary air injection solenoid valve.
4. Ignition OFF and all vehicle systems OFF, it may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 Ω between the Q29 secondary air injection solenoid valve ground circuit terminal 4 and ground.
   • If 10 Ω or greater 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
   • If less than 10 Ω 
5. Connect the harness connector at the Q29 secondary air injection solenoid valve.
6. Connect a 15 A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87.
7. Verify the Q29 secondary air injection solenoid valve is activated.
   • If the Q29 secondary air injection solenoid valve does not activate 
   1. Ignition OFF, disconnect the harness connector at the Q29 secondary air injection solenoid valve.
   2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, test or replace the Q29 secondary air injection solenoid valve.
   • If the Q29 secondary air injection solenoid valve activates 
8. Test or replace the KR26 secondary air injection solenoid valve relay.

Secondary Air Injection Pump Malfunction

1. Ignition OFF, disconnect the KR25 secondary air injection pump relay.
2. Verify a test lamp illuminates between the B+ circuit terminal 87 and ground.
   • If the test lamp does not illuminate and the circuit fuse is good 
   1. Ignition OFF
   2. Test for less than 2 Ω in the B+ circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
   • If the test lamp does not illuminate and the circuit fuse is open 
   1. Ignition OFF
   2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
   3. Disconnect the harness connector at the G21 secondary air injection pump.
      NOTE:

      The secondary air injection pump circuit is provided with a flyback diode that may cause the DTC to set if internally shorted.

   4. Connect a DMM, set on the diode setting, between the control circuit terminal A and ground.
   5. Verify the DMM reading is between 0.5-0.8 V and displays O.L. when the DMM leads are reversed.
      • If less than the specified range, repair the short to ground on the circuit.
      • If within the specified range
   6. Test or replace the G21 secondary air injection pump.
   • If the test lamp illuminates 
3. Disconnect the harness connector at the G21 secondary air injection pump.
4. Ignition OFF and all vehicle systems OFF, it may take up to 2 minutes for all vehicle systems to power down. Test for less than 10 Ω between the G21 secondary air injection pump ground circuit terminal B and ground.
   • If 10 Ω or greater 
   1. Ignition OFF.
   2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
   • If less than 10 Ω 
5. Connect the harness connector at the G21 secondary air injection pump.
6. Connect a 50 A fused jumper wire between the B+ circuit terminal 87 and the control circuit terminal 30.
NOTE:

To prevent damage to the secondary air injection pump from overheating, do not continuously operate the pump for greater than 3 min.

7. Verify the G21 secondary air injection pump is activated.
   • If the G21 secondary air injection pump does not activate 
   1. Ignition OFF, disconnect the harness connector at the G21 secondary air injection pump.
   2. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω,
   3. Test or replace the G21 secondary air injection pump.
   • If the G21 secondary air injection pump activates 
8. Test or replace the KR25 secondary air injection pump relay.

Secondary Air Injection System Pressure Not In Range

1. Verify the following conditions do not exist:
   • Hoses/pipes restricted or blocked
   • Hoses/pipes disconnected
   • Plugged secondary air injection pressure sensor port
   • Damaged secondary air injection check valve
   • If a condition is located 

     Repair or replace the affected component as necessary.

   • If all components test normal 
2. If a condition is not located, and the secondary air injection pump operates with no pressure change, replace the G21 secondary air injection pump.