2. Testing The Fused Engine Control Relay Output And Ground Circuit Of The Secondary Air Pump Switchover Solenoid.

Turn the ignition off.

Disconnect the Air Pump Switchover Solenoid.

NOTE: Check connectors - Clean/repair as necessary.

Turn the ignition on.

With the DRB III(R), actuate the Air Pump Switchover Solenoid.

Measure the voltage between the Fused Engine Control Relay Output circuit and the Air Pump Switchover Solenoid Control circuit at the Air Pump Switchover Solenoid harness connector.

Fig 1: Measuring Voltage Between Fused Engine Control Relay Output Circuit & Air Pump Switchover Solenoid Control Circuit

Courtesy of DAIMLERCHRYSLER CORP.

Does the voltage toggle between B(+) and 0 volts?

Yes >> Replace the Air Pump Switchover Solenoid. See EMISSIONS CONTROL article.
See POWERTRAIN VERIFICATION TEST - VER 2 .
No >> Go To 3