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P0418




DTC P0412 or P0418

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle

* Review Strategy Based Diagnosis Strategy Based Diagnosis

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions

DTC Descriptor

DTC P0412
- Secondary Air Injection Solenoid Control Circuit

DTC P0418
- Secondary Air Injection Pump Control Circuit

Diagnostic Fault Information






Circuit/System Description

The secondary air injection system aids in the reduction of hydrocarbon emissions during a cold start. The electric air pump forces fresh air into the exhaust stream in order to accelerate the catalyst operation. Ignition voltage is supplied directly to the secondary air injection pump relay and secondary air solenoid valve relay. The engine control module (ECM) controls the relays by grounding the control circuit with a solid state device called a driver. The ECM monitors the control circuits for open, short to ground, or short to voltage conditions.

Conditions for Running the DTC

* The ignition voltage is between 10-32 V.

* The DTCs run continuously once the above conditions are met.

Conditions for Setting the DTC

DTC P0412 or P0418

The ECM detects that the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

Action Taken When the DTC Sets

DTC P0412 and P0418 are Type B DTCs.

Conditions for Clearing the DTC

DTC P0412 and P0418 are Type B DTCs.

Diagnostic Aids

If the condition is intermittent, move the related harnesses and connectors, with the engine operating, while monitoring the scan tool Secondary Air Injection Solenoid Valve Control Circuit and Secondary Air Injection Pump Relay Control Circuit status parameters. The circuit status parameter changes from OK or Not Run to Malfunction if there is a condition with the circuit or a connection.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left Front

Description and Operation

Secondary Air Injection System Description Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

P0412

1. Ignition ON

2. Verify a click is heard or felt from the KR25 Secondary Air Injection Pump Relay and the KR26 Secondary Air Injection Solenoid Valve Relay when commanding the Secondary Air Injection System between Inactive and Active with a scan tool.

• If a click is not heard or felt at one or more of the relays
Refer to Circuit/System Testing

• If a click is heard or felt at each of the relays

3. Verify the circuit status parameters listed below do not display Malfunction when commanding the Secondary Air Injection System between Inactive and Active with a scan tool:

* Secondary Air Injection Pump Relay Control Circuit Low Voltage Test Status

* Secondary Air Injection Pump Relay Control Circuit Open Test Status

* Secondary Air Injection Pump Relay Control Circuit High Voltage Test Status

* Secondary Air Injection Solenoid Valve Control Circuit Low Voltage Test Status

* Secondary Air Injection Solenoid Valve Control Circuit Open Test Status

* Secondary Air Injection Solenoid Valve Control Circuit High Voltage Test Status

• If Malfunction is displayed
Refer to Circuit/System Testing

• If Malfunction is not displayed

4. 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.

5. Verify a DTC does not set.

• If a DTC sets
Refer to Circuit/System Testing

• If a DTC does not set

6. All OK

Circuit/System Testing

P0412

1. Ignition OFF, disconnect the KR26 Secondary Air Injection Solenoid Valve Relay. Ignition ON.

2. Verify a test lamp illuminates between the relay coil ignition circuit terminal 86 and ground.

• If the test lamp does not illuminate and the circuit fuse is good

1. Ignition OFF.

2. Test for less than 2 ohms in the ignition circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, 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 ignition circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, test or replace the KR26 Secondary Air Injection Solenoid Valve Relay

• If the test lamp illuminates

3. Connect a DMM, set on the diode setting, between the control circuit terminal 85 and ground.

4. Verify the DMM reading is greater than 2.5 V or displays O.L. when commanding the Secondary Air Injection Solenoid Valve Closed with a scan tool.

• If 2.5 V or less

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module

2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

3. . Ignition OFF.

4. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, test or replace the K20 Engine Control Module

• If greater than 2.5 V or displays O.L.

5. Verify the DMM reading is less than 1 V when commanding the Secondary Air Injection Solenoid Valve Open with a scan tool.

• If 1 V or greater

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If less than 1 V

6. Test or replace the KR26 Secondary Air Injection Solenoid Valve Relay.

P0418

1. Ignition OFF, disconnect the KR25 Secondary Air Injection Pump Relay. Ignition ON.

2. Verify a test lamp illuminates between the relay coil ignition circuit terminal 86 and ground.

• If the test lamp does not illuminate

1. Ignition OFF.

2. Test for less than 2 ohms in the ignition circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If the test lamp illuminates

3. Connect a DMM, set on the diode setting, between the control circuit terminal 85 and ground.

4. Verify the DMM reading is greater than 2.5 V or displays O.L. when commanding the Secondary Air Injection Pump Relay OFF with a scan tool.

• If 2.5 V or less

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module

2. Test for less than 1 V between the control circuit and ground.

• If 1 V or greater, repair the short to voltage on the circuit.

• If less than 1 V

3. . Ignition OFF.

4. Test for infinite resistance between the control circuit and ground.

• If less than infinite resistance, repair the short to ground on the circuit.

• If infinite resistance, test or replace the K20 Engine Control Module

• If greater than 2.5 V or displays O.L.

5. Verify the DMM reading is less than 1 V when commanding the Secondary Air Injection Pump Relay ON with a scan tool.

• If 1 V or greater

1. Ignition OFF, disconnect the harness connector at the K20 Engine Control Module.

2. Test for less than 2 ohms in the control circuit end to end.

• If 2 ohms or greater, repair the open/high resistance in the circuit.

• If less than 2 ohms, replace the K20 Engine Control Module.

• If less than 1 V

6. Test or replace the KR25 Secondary Air Injection Pump Relay.

Component Testing

Relay Test

1. Ignition OFF, disconnect the appropriate relay.

2. Test for 70-110 ohms between terminals 85-86.

• If less than 70 ohms or greater than 110 ohms
Replace the relay.

• If between 70-110 ohms

3. Test for infinite resistance between the terminals listed below:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

• If less than infinite resistance
Replace the relay.

• If infinite resistance

4. Install a 15 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.

5. Test for less than 2 ohms between terminals 30 and 87.

• If 2 ohms or greater
Replace the relay.

• If less than 2 ohms

6. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)

* Control Module References Control Module References for Engine Control Module replacement, programming, and setup

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