Engine Control System - Tests W/codes - DTC P0352-P0452: Overview Saturn SL II

MODEL IDENTIFICATION

Vehicle model is identified by fourth character (cars), or fifth character (trucks) of Vehicle Identification Number (VIN). VIN is stamped on metal pad on top of left end of instrument panel, near windshield. See MODEL IDENTIFICATION (CARS) table, or MODEL IDENTIFICATION (TRUCKS) table under MODEL IDENTIFICATION in INTRODUCTION article.

Test Description

The numbers below refer to the step numbers on the diagnostic procedures.

1. 2 DTC P0412 AIR Solenoid Valve Control Circuit and P0418 AIR Pump Relay Control Circuit should be diagnosed first if either are set.
2. 3 Begins testing for a short to ground in the AIR pump feed circuit.
3. 4 Listen for a running motor. Command both the ON and OFF states. Repeat the commands as necessary.
4. 5 Begins testing for a short to voltage in the pump feed circuit.
5. 6 Tests for voltage at the AIR pump relay switch feed circuit.
6. 7 Bypasses the relay.
7. 8 Tests for voltage on the AIR pump feed circuit.
8. 9 Tests for an open on the pump ground circuit.
9. 28 The AIR Pump is not designed to run continuously. If the pump needs to be replaced, check for conditions that may cause continuous pump operation.