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Home >> Saab >> 1999 >> 9-3 Base, 2D Hatchback, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - TRIONIC T7 Fuel Control System >> Diagnostic Tests >> DTC P1656-P1657: A/C Relay Coil Circuit

DTC P1656-P1657: A/C Relay Coil Circuit

  1. Unplug A/C relay from underhood fuse/relay box. See Fig 1. Turn ignition on. Connect SST 86 11 857 test light (see Figure) or equivalent between A/C relay plug-in terminal No. 4 (Yellow/Red wire) and ground. See Figure. If test light illuminates, go to next step. If test light does not illuminate, check fuse No. 19 in dashboard fuse block. See Figure. If fuse is okay, check for faulty circuit between fuse No. 19 and A/C relay plug-in terminal No. 4 (Yellow/Red wire). See appropriate wiring diagram in WIRING DIAGRAMS article. Repair as necessary and go to step  3.
  2. Connect test light between A/C relay plug-in terminals No. 4 (Yellow/Red wire) and 5 (Red/White wire). Connect TECH 2 scan tool to Data Link Connector (DLC). Select ACTIVATE: A/C RELAY (ON). If test light illuminates, change A/C relay and go to next step. If test light does not illuminate, check for faulty circuit between A/C relay plug-in terminal No. 5 and ECM harness connector terminal No. 4 (Red/White wire). See Figure for ECM location. See Figure. Repair as necessary and go to next step.
  3. Use scan tool to clear all system DTCs. Drive vehicle for 5 minutes under varying loads and engine RPM. Recheck for any stored DTCs. If DTC P1656-P1657 is present, substitute known good ECM and retest system. See ENGINE CONTROL MODULE (ECM) under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article.
Fig 1: Identifying A/C Relay Location (9-3 Series)
G99F52949Courtesy of SAAB-SCANIA OF AMERICA, INC.
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