2010 Cadillac Truck SRX AWD V6-3.0L Page 1485

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2010 Cadillac Truck SRX AWD V6-3.0L Page 1485



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



Distribution Relay/Service and Repair/Relay Replacement (Within an Electrical Center))



* Secondary Air Injection Pump Replacement (See: Powertrain Management/Emission Control Systems/Air Injection/Air Injection



Pump/Service and Repair)



P0418



DTC P0418, P2257, or P2258



Diagnostic Instructions



* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System



Check - Vehicle) prior to using this diagnostic procedure.



* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an



overview of the diagnostic approach.



* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure



Instructions)provides an overview of each diagnostic category.



DTC Descriptors



DTC P0418



- Secondary Air Injection Pump Control Circuit



DTC P2257



- Secondary Air Injection Pump Relay Control Circuit Low Voltage



DTC P2258



- Secondary Air Injection Pump Relay Control Circuit High Voltage



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. The



engine control module (ECM) controls the relay by grounding the control circuit with a solid state device called a driver. The driver is equipped



with a feedback circuit that is pulled-up to a voltage. The ECM can determine if the control circuit is open, shorted to ground, or shorted to a

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